case study on amazon ec2
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8. Parallel Computer
I. A. What is Parallel Computing?
Traditionally, software has been written for serialcomputation:
o To be run on a single computer having a single Central Processing Unit
(CPU);o A problem is broken into a discrete series of instructions.
o Instructions are executed one after another.
o Only one instruction may execute at any moment in time.
In the simplest sense, parallel computingis the simultaneous use of multiple
compute resources to solve a computational problem:
o To be run using multiple CPUs
o A problem is broken into discrete parts that can be solved concurrently
o Each part is further broken down to a series of instructions
o Instructions from each part execute simultaneously on different CPUs
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For example:
The compute resources might be:
o A single computer with multiple processors;
o An arbitrary number of computers connected by a network;
o A combination of both.
The computational problem should be able to:
o Be broken apart into discrete pieces of work that can be solved
simultaneously;
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o Execute multiple program instructions at any moment in time;
o Be solved in less time with multiple compute resources than with a single
compute resource.
The Universe is Parallel:
Parallel computing is an evolution of serial computing that attempts to emulatewhat has always been the state of affairs in the natural world: many complex,
interrelated events happening at the same time, yet within a sequence. For
example:
o Galaxy formation
o Planetary movement
o Weather and ocean
patterns
o Tectonic plate drift
o Rush hour traffic
o Automobile assembly line
o Building a jet
o Ordering a hamburger at
the drive through.
Uses for Parallel Computing:
Historically, parallel computing has been considered to be "the high end of
computing", and has been used to model difficult problems in many areas of
science and engineering:
o Atmosphere, Earth, Environment
o Physics - applied, nuclear, particle, condensed matter, high pressure,
fusion, photonics
o Bioscience, Biotechnology, Genetics
o Chemistry, Molecular Sciences
o Geology, Seismology
o Mechanical Engineering - from prosthetics to spacecraft
o Electrical Engineering, Circuit Design, Microelectronics
o Computer Science, Mathematics
Today, commercial applications provide an equal or greater driving force in
the development of faster computers. These applications require the
processing of large amounts of data in sophisticated ways. For example:
o Databases, data mining
o Oil explorationo Web search engines, web based business services
o Medical imaging and diagnosis
o Pharmaceutical design
o Management of national and multi-national corporations
o Financial and economic modeling
o Advanced graphics and virtual reality, particularly in the entertainment
industry
o Networked video and multi-media technologies
o
Collaborative work environments
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III. Flynn's Classical Taxonomy
There are different ways to classify parallel computers. One of the more widely
used classifications, in use since 1966, is called Flynn's Taxonomy. Flynn's taxonomy distinguishes multi-processor computer architectures according
to how they can be classified along the two independent dimensions ofInstructionand Data. Each of these dimensions can have only one of twopossible states: Singleor Multiple.
The matrix below defines the 4 possible classifications according to Flynn:
S I S D
Single Instruction, Single Data
S I M D
Single Instruction, Multiple Data
M I S D
Multiple Instruction, Single Data
M I M D
Multiple Instruction, Multiple Data
Single Instruction, Single Data (SISD):
A serial (non-parallel) computer Single Instruction: Only one instruction stream is being acted on by the CPU
during any one clock cycle
Single Data: Only one data stream is being used as input during any oneclock cycle
Deterministic execution This is the oldest and even today, the most common type of computer Examples: older generation mainframes, minicomputers and workstations;
most modern day PCs.
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Single Instruction, Multiple Data (SIMD):
A type of parallel computer
Single Instruction: All processing units execute the same instruction at any
given clock cycle
Multiple Data: Each processing unit can operate on a different data element Best suited for specialized problems characterized by a high degree of
regularity, such as graphics/image processing.
Synchronous (lockstep) and deterministic execution
Two varieties: Processor Arrays and Vector Pipelines
Examples:
o Processor Arrays: Connection Machine CM-2, MasPar MP-1 & MP-2,
ILLIAC IV
o Vector Pipelines: IBM 9000, Cray X-MP, Y-MP & C90, Fujitsu VP, NEC
SX-2, Hitachi S820, ETA10
Most modern computers, particularly those with graphics processor units(GPUs) employ SIMD instructions and execution units.
Multiple Instruction, Single Data (MISD):
A type of parallel computer
Multiple Instruction: Each processing unit operates on the data
independently via separate instruction streams.
Single Data: A single data stream is fed into multiple processing units.
Few actual examples of this class of parallel computer have ever existed. Oneis the experimental Carnegie-Mellon C.mmp computer (1971).
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Some conceivable uses might be:
o multiple frequency filters operating on a single signal stream
o multiple cryptography algorithms attempting to crack a single coded
message.
o
Multiple Instruction, Multiple Data (MIMD):
A type of parallel computer
Multiple Instruction: Every processor may be executing a different
instruction stream
Multiple Data: Every processor may be working with a different data stream
Execution can be synchronous or asynchronous, deterministic or non-
deterministic
Currently, the most common type of parallel computer - most modernsupercomputers fall into this category.
Examples: most current supercomputers, networked parallel computer
clusters and "grids", multi-processor SMP computers, multi-core PCs.
Note: many MIMD architectures also include SIMD execution sub-
components
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IV. Parallel Computer Memory Architectures:
Shared Memory
General Characteristics:
Shared memory parallel computers vary widely, but generally have in
common the ability for all processors to access all memory as global addressspace.
Multiple processors can operate independently but share the same memory
resources.
Changes in a memory location effected by one processor are visible to all
other processors.
Shared memory machines can be divided into two main classes based upon
memory access times: UMA and
Uniform Memory Access (UMA):
Most commonly represented today by Symmetric Multiprocessor (SMP)
machines Identical processors
Equal access and access times to memory
Sometimes called CC-UMA - Cache Coherent UMA. Cache coherent means if
one processor updates a location in shared memory, all the other processors
know about the update. Cache coherency is accomplished at the hardware
level.
Shared Memory (UMA)
Non-Uniform Memory Access (NUMA):
Often made by physically linking two or more SMPs
One SMP can directly access memory of another SMP
Not all processors have equal access time to all memories
Memory access across link is slower
If cache coherency is maintained, then may also be called CC-NUMA - Cache
Coherent NUMA
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Shared Memory (NUMA)
Advantages:
Global address space provides a user-friendly programming perspective to
memory
Data sharing between tasks is both fast and uniform due to the proximity of
memory to CPUs
Disadvantages:
Primary disadvantage is the lack of scalability between memory and CPUs.
Adding more CPUs can geometrically increases traffic on the shared memory-
CPU path, and for cache coherent systems, geometrically increase traffic
associated with cache/memory management.
Programmer responsibility for synchronization constructs that ensure "correct"
access of global memory.
Expense: it becomes increasingly difficult and expensive to design and
produce shared memory machines with ever increasing numbers ofprocessors.
distributed Memory
General Characteristics:
Like shared memory systems, distributed memory systems vary widely but
share a common characteristic. Distributed memory systems require a
communication network to connect inter-processor memory.
Processors have their own local memory. Memory addresses in one
processor do not map to another processor, so there is no concept of global
address space across all processors. Because each processor has its own local memory, it operates independently.
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Changes it makes to its local memory have no effect on the memory of other
processors. Hence, the concept of cache coherency does not apply.
When a processor needs access to data in another processor, it is usually the
task of the programmer to explicitly define how and when data is
communicated. Synchronization between tasks is likewise the programmer'sresponsibility.
The network "fabric" used for data transfer varies widely, though it can can be
as simple as Ethernet.
Advantages:
Memory is scalable with the number of processors. Increase the number of
processors and the size of memory increases proportionately.
Each processor can rapidly access its own memory without interference and
without the overhead incurred with trying to maintain cache coherency.
Cost effectiveness: can use commodity, off-the-shelf processors and
networking.Disadvantages:
The programmer is responsible for many of the details associated with data
communication between processors.
It may be difficult to map existing data structures, based on global memory, to
this memory organization.
Non-uniform memory access (NUMA) times
Hybrid Distributed-Shared Memory
The largest and fastest computers in the world today employ both shared and
distributed memory architectures. The shared memory component can be a cache coherent SMP machine
and/or graphics processing units (GPU).
The distributed memory component is the networking of multiple SMP/GPU
machines, which know only about their own memory - not the memory on
another machine. Therefore, network communications are required to move
data from one SMP/GPU to another.
Current trends seem to indicate that this type of memory architecture will
continue to prevail and increase at the high end of computing for the
foreseeable future.
Advantages and Disadvantages: whatever is common to both shared and
distributed memory architectures.
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CASE STUDY ON AMAZON EC2
This below facility shows how businesses are leveraging Amazon Web Services
scalable, reliable and cost-effective cloud technology.
Application HostingBackup and Storage
Content Delivery
E-Commerce
High Performance Computing
Media Hosting
On-Demand Workforce
Search Engines
Web Hosting
Amazon Elastic Compute Cloud (Amazon EC2) is a web service that providesresizable compute capacity in the cloud. It is designed to make web-scale computing
easier for developers.
Amazon EC2s simple web service interface allows you to obtain and configure
capacity with minimal friction. It provides you with complete control of your
computing resources and lets you run on Amazons proven computing environment.
Amazon EC2 reduces the time required to obtain and boot new server instances to
minutes, allowing you to quickly scale capacity, both up and down, as your
computing requirements change. Amazon EC2 changes the economics of computingby allowing you to pay only for capacity that you actually use. Amazon EC2 provides
developers the tools to build failure resilient applications and isolate themselves from
common failure scenarios.
Amazon EC2 Functionality
Amazon EC2 presents a true virtual computing environment, allowing you to useweb service interfaces to launch instances with a variety of operating systems, loadthem with your custom application environment, manage your networks access
permissions, and run your image using as many or few systems as you desire.
To use Amazon EC2, you simply:
Select a pre-configured, templated image to get up and running immediately.Or create an Amazon Machine Image (AMI) containing your applications,libraries, data, and associated configuration settings.
Configure security and network access on your Amazon EC2 instance. Choose which instance type(s) and operating system you want, then start,
terminate, and monitor as many instances of your AMI as needed, using theweb service APIs or the variety of management tools provided.
Determine whether you want to run in multiple locations, utilize static IPendpoints, or attach persistent block storage to your instances.
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InexpensiveAmazon EC2 passes on to you the financial benefits of Amazonsscale. You pay a very low rate for the compute capacity you actually consume. SeeAmazon EC2 Instance Purchasing Optionsfor a more detailed description.
On-Demand Instances On-Demand Instances let you pay for compute
capacity by the hour with no long-term commitments. This frees you from thecosts and complexities of planning, purchasing, and maintaining hardwareand transforms what are commonly large fixed costs into much smallervariable costs. On-Demand Instances also remove the need to buy safetynet capacity to handle periodic traffic spikes.
Reserved Instances Reserved Instances give you the option to make a low,one-time payment for each instance you want to reserve and in turn receive asignificant discount on the hourly usage charge for that instance. After theone-time payment for an instance, that instance is reserved for you, and youhave no further obligation; you may choose to run that instance for thediscounted usage rate for the duration of your term, or when you do not use
the instance, you will not pay usage charges on it. Spot Instances Spot Instances allow customers to bid on unused Amazon
EC2 capacity and run those instances for as long as their bid exceeds thecurrent Spot Price. The Spot Price changes periodically based on supply anddemand, and customers whose bids meet or exceed it gain access to theavailable Spot Instances. If you have flexibility in when your applications canrun, Spot Instances can significantly lower your Amazon EC2 costs.
Features
Amazon EC2 provides a number of powerful features for building scalable, failureresilient, enterprise class applications, including:
Amazon Elastic Block Store Amazon Elastic Block Store (EBS) offerspersistent storage for Amazon EC2 instances. Amazon EBS volumes provideoff-instance storage that persists independently from the life of an instance.Amazon EBS volumes are highly available, highly reliable volumes that canbe leveraged as an Amazon EC2 instances boot partition or attached to arunning Amazon EC2 instance as a standard block device. When used as aboot partition, Amazon EC2 instances can be stopped and subsequentlyrestarted, enabling you to only pay for the storage resources used while
maintaining your instances state. Amazon EBS volumes offer greatlyimproved durability over local Amazon EC2 instance stores, as Amazon EBSvolumes are automatically replicated on the backend (in a single AvailabilityZone). For those wanting even more durability, Amazon EBS provides theability to create point-in-time consistent snapshots of your volumes that arethen stored in Amazon S3, and automatically replicated across multipleAvailability Zones. These snapshots can be used as the starting point for newAmazon EBS volumes, and can protect your data for long term durability. Youcan also easily share these snapshots with co-workers and other AWSdevelopers. See Amazon Elastic Block Store for more details on this feature.
Multiple Locations Amazon EC2 provides the ability to place instances inmultiple locations. Amazon EC2 locations are composed of Regions and
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Availability Zones. Availability Zones are distinct locations that are engineeredto be insulated from failures in other Availability Zones and provideinexpensive, low latency network connectivity to other Availability Zones in thesame Region. By launching instances in separate Availability Zones, you canprotect your applications from failure of a single location. Regions consist of
one or more Availability Zones, are geographically dispersed, and will be inseparate geographic areas or countries. TheAmazon EC2 Service LevelAgreementcommitment is 99.95% availability for each Amazon EC2 Region.Amazon EC2 is currently available in six regions: US East (Northern Virginia),US West (Northern California), EU (Ireland), Asia Pacific (Singapore), AsiaPacific (Tokyo), andAWS GovCloud.
Elastic IP Addresses Elastic IP addresses are static IP addressesdesigned for dynamic cloud computing. An Elastic IP address is associatedwith your account not a particular instance, and you control that address untilyou choose to explicitly release it. Unlike traditional static IP addresses,
however, Elastic IP addresses allow you to mask instance or Availability Zonefailures by programmatically remapping your public IP addresses to anyinstance in your account. Rather than waiting on a data technician toreconfigure or replace your host, or waiting for DNS to propagate to all of yourcustomers, Amazon EC2 enables you to engineer around problems with yourinstance or software by quickly remapping your Elastic IP address to areplacement instance. In addition, you can optionally configure the reverseDNS record of any of your Elastic IP addresses by filling out thisform.
Amazon Virtual Private Cloud Amazon VPC is a secure and seamlessbridge between a companys existing IT infrastructure and the AWS cloud.Amazon VPC enables enterprises to connect their existing infrastructure to aset of isolated AWS compute resources via a Virtual Private Network (VPN)connection, and to extend their existing management capabilities such assecurity services, firewalls, and intrusion detection systems to include theirAWS resources.
Amazon CloudWatch Amazon CloudWatch is a web service that providesmonitoring for AWS cloud resources and applications, starting with AmazonEC2. It provides you with visibility into resource utilization, operationalperformance, and overall demand patternsincluding metrics such as CPU
utilization, disk reads and writes, and network traffic. You can get statistics,view graphs, and set alarms for your metric data. To use AmazonCloudWatch, simply select the Amazon EC2 instances that youd like tomonitor. You can also supply your own business or application metric data.Amazon CloudWatch will begin aggregating and storing monitoring data thatcan be accessed using web service APIs or Command Line Tools. AutoScaling Auto Scaling allows you to automatically scale your Amazon EC2capacity up or down according to conditions you define. With Auto Scaling,you can ensure that the number of Amazon EC2 instances youre usingscales up seamlessly during demand spikes to maintain performance, andscales down automatically during demand lulls to minimize costs. Auto
Scaling is particularly well suited for applications that experience hourly, daily,or weekly variability in usage. Auto Scaling is enabled by Amazon
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CloudWatch and available at no additional charge beyond AmazonCloudWatch fees.
Elastic Load Balancing Elastic Load Balancing automatically distributesincoming application traffic across multiple Amazon EC2 instances. It enables
you to achieve even greater fault tolerance in your applications, seamlesslyproviding the amount of load balancing capacity needed in response toincoming application traffic. Elastic Load Balancing detects unhealthyinstances within a pool and automatically reroutes traffic to healthy instancesuntil the unhealthy instances have been restored. You can enable ElasticLoad Balancing within a single Availability Zone or across multiple zones foreven more consistent application performance. Amazon CloudWatch can beused to capture a specific Elastic Load Balancers operational metrics, suchas request count and request latency, at no additional cost beyond ElasticLoad Balancing fees.
High Performance Computing (HPC) Clusters Customers with complexcomputational workloads such as tightly coupled parallel processes, or withapplications sensitive to network performance, can achieve the same highcompute and network performance provided by custom-built infrastructurewhile benefiting from the elasticity, flexibility and cost advantages of AmazonEC2. Cluster Compute and Cluster GPU Instances have been specificallyengineered to provide high-performance network capability and can beprogrammatically launched into clusters allowing applications to get the low-latency network performance required for tightly coupled, node-to-nodecommunication. Cluster Compute and Cluster GPU Instances also providesignificantly increased network throughput making them well suited forcustomer applications that need to perform network-intensive operations.
VM Import VM Import enables you to easily import virtual machine imagesfrom your existing environment to Amazon EC2 instances. VM Import allowsyou to leverage your existing investments in the virtual machines that youhave built to meet your IT security, configuration management, andcompliance requirements by seamlessly bringing those virtual machines intoAmazon EC2 as ready-to-use instances. This offering is available at noadditional charge beyond standard usage charges for Amazon EC2 andAmazon S3.
Instance Types
Standard Instances
Instances of this family are well suited for most applications.
Small Instance (Default) 1.7 GB of memory, 1 EC2 Compute Unit (1 virtualcore with 1 EC2 Compute Unit), 160 GB of local instance storage, 32-bitplatform
Large Instance 7.5 GB of memory, 4 EC2 Compute Units (2 virtual cores with
2 EC2 Compute Units each), 850 GB of local instance storage, 64-bit platform
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Extra Large Instance 15 GB of memory, 8 EC2 Compute Units (4 virtual coreswith 2 EC2 Compute Units each), 1690 GB of local instance storage, 64-bitplatform
Micro Instances
Instances of this family provide a small amount of consistent CPU resources andallow you to burst CPU capacity when additional cycles are available. They are wellsuited for lower throughput applications and web sites that consume significantcompute cycles periodically.
Micro Instance 613 MB of memory, up to 2 ECUs (for short periodic bursts),EBS storage only, 32-bit or 64-bit platform
High-Memory Instances
Instances of this family offer large memory sizes for high throughput applications,including database and memory caching applications.
High-Memory Extra Large Instance 17.1 GB memory, 6.5 ECU (2 virtual coreswith 3.25 EC2 Compute Units each), 420 GB of local instance storage, 64-bitplatform
High-Memory Double Extra Large Instance 34.2 GB of memory, 13 EC2Compute Units (4 virtual cores with 3.25 EC2 Compute Units each), 850 GBof local instance storage, 64-bit platform
High-Memory Quadruple Extra Large Instance 68.4 GB of memory, 26 EC2Compute Units (8 virtual cores with 3.25 EC2 Compute Units each), 1690 GBof local instance storage, 64-bit platform
High-CPU Instances
Instances of this family have proportionally more CPU resources than memory(RAM) and are well suited for compute-intensive applications.
High-CPU Medium Instance 1.7 GB of memory, 5 EC2 Compute Units (2virtual cores with 2.5 EC2 Compute Units each), 350 GB of local instancestorage, 32-bit platform
High-CPU Extra Large Instance 7 GB of memory, 20 EC2 Compute Units (8virtual cores with 2.5 EC2 Compute Units each), 1690 GB of local instancestorage, 64-bit platform
Cluster Compute Instances
Instances of this family provide proportionally high CPU with increased networkperformance and are well suited for High Performance Compute (HPC) applicationsand other demanding network-bound applications
Cluster Compute Quadruple Extra Large 23 GB memory, 33.5 EC2 Compute Units,
1690 GB of local instance storage, 64-bit platform, 10 Gigabit Ethernet
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Cluster GPU Instances
Instances of this family provide general-purpose graphics processing units (GPUs)with proportionally high CPU and increased network performance for applicationsbenefitting from highly parallelized processing, including HPC, rendering and media
processing applications. While Cluster Compute Instances provide the ability tocreate clusters of instances connected by a low latency, high throughput network,Cluster GPU Instances provide an additional option for applications that can benefitfrom the efficiency gains of the parallel computing power of GPUs over what can beachieved with traditional processors.
Cluster GPU Quadruple Extra Large 22 GB memory, 33.5 EC2 ComputeUnits, 2 x NVIDIA Tesla Fermi M2050 GPUs, 1690 GB of local instancestorage, 64-bit platform, 10 Gigabit Ethernet
EC2 Compute Unit (ECU) One EC2 Compute Unit (ECU) provides the equivalent
CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor.
Operating Systems and Software
Operating Systems
Amazon Machine Images (AMIs) are preconfigured with an ever-growing list ofoperating systems. We work with our partners and community to provide you withthe most choice possible. You are also empowered to use our bundling tools toupload your own operating systems. The operating systems currently available to
use with your Amazon EC2 instances include:
Operating SystemsRed Hat Enterprise Linux Windows Server Oracle Enterprise Linux SUSE Linux Enterprise Amazon Linux AMI Ubuntu LinuxFedora Gentoo Linux Debian
Software
Amazon EC2 enables our partners and customers to build and customize Amazon
Machine Images (AMIs) with software based on your needs. We have hundreds offree and paid AMIs available for you to use. A small sampling of the softwareavailable for use today within Amazon EC2 includes:
Databases ResourceManagement
Web Hosting
IBM DB2 StackIQ Rocks+ Apache HTTPIBM Informix DynamicServer
Hadoop IIS/Asp.Net
Microsoft SQL ServerStandard
Condor IBM Lotus Web ContentManagement
MySQL Enterprise IBM WebSphere Portal Server
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Oracle Database 11g
Application Development
Environments
Application Servers Video Encoding &
StreamingIBM sMash IBM WebSphere
Application ServerWowza Media ServerPro
JBoss Enterprise ApplicationPlatform
Java Application Server Windows MediaServer
Ruby on Rails Oracle WebLogic Server
Pricing
Pay only for what you use. There is no minimum fee. Estimate your monthly bill
using AWS Simple Monthly Calculator. The prices listed are based on the Region inwhich your instance is running. For a detailed comparison between On-Demand
Instances, Reserved Instances and Spot Instances, see Amazon EC2 Instance
Purchasing Options.
Free Tier*
As part of AWSs Free Usage Tier , new AWS customers can get started with
Amazon EC2 for free. Upon sign-up, new AWS customers receive the following EC2
services each month for one year:
750 hours of EC2 running Linux/Unix Micro instance usage
750 hours of Elastic Load Balancing plus 15 GB data processing
10 GB of Amazon Elastic Block Storage (EBS) plus 1 million IOs, 1 GB
snapshot storage, 10,000 snapshot Get Requests and 1,000 snapshot Put
Requests
15 GB of bandwidth out aggregated across all AWS services
1 GB of Regional Data Transfer
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Case Study on Google App Engine
Google App Engine lets you run your web applications on Google's infrastructure.
App Engine applications are easy to build, easy to maintain, and easy to scale as
your traffic and data storage needs grow. With App Engine, there are no servers to
maintain: You just upload your application, and it's ready to serve your users.
You can serve your app from your own domain name (such
as http://www.example.com/) usingGoogle Apps. Or, you can serve your app using
a free name on the appspot.com domain. You can share your application with the
world, or limit access to members of your organization.
Google App Engine supports apps written in several programming languages. With
App Engine's Java runtime environment, you can build your app using standard Java
technologies, including the JVM, Java servlets, and the Java programming
languageor any other language using a JVM-based interpreter or compiler, suchas JavaScript or Ruby. App Engine also features a dedicated Python runtime
environment, which includes a fast Python interpreter and the Python standard
library, and a Go runtime environment that runs natively compiled Go code. These
runtime environments are built to ensure that your application runs quickly, securely,
and without interference from other apps on the system.
With App Engine, you only pay for what you use. There are no set-up costs and no
recurring fees. The resources your application uses, such as storage and bandwidth,
are measured by the gigabyte, and billed at competitive rates. You control the
maximum amounts of resources your app can consume, so it always stays within
your budget.
App Engine costs nothing to get started. All applications can use up to 1 GB of
storage and enough CPU and bandwidth to support an efficient app serving around 5
million page views a month, absolutely free. When you enable billing for your
application, your free limits are raised, and you only pay for resources you use above
the free levels.
The Application Environment
Google App Engine makes it easy to build an application that runs reliably, even
under heavy load and with large amounts of data. App Engine includes the following
features:
dynamic web serving, with full support for common web technologies
persistent storage with queries, sorting and transactions
automatic scaling and load balancing
APIs for authenticating users and sending email using Google Accounts
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a fully featured local development environment that simulates Google App
Engine on your computer
task queues for performing work outside of the scope of a web request
scheduled tasks for triggering events at specified times and regular intervals
Your application can run in one of three runtime environments: the Go environment,
theJavaenvironment, and thePythonenvironment. Each environment provides
standard protocols and common technologies for web application development.
The Sandbox
Applications run in a secure environment that provides limited access to the
underlying operating system. These limitations allow App Engine to distribute web
requests for the application across multiple servers, and start and stop servers to
meet traffic demands. The sandbox isolates your application in its own secure,
reliable environment that is independent of the hardware, operating system and
physical location of the web server.
Examples of the limitations of the secure sandbox environment include:
An application can only access other computers on the Internet through the
provided URL fetch and email services. Other computers can only connect to
the application by making HTTP (or HTTPS) requests on the standard ports.
An application cannot write to the file system. An app can read files, but onlyfiles uploaded with the application code. The app must use the App Engine
datastore, memcache or other services for all data that persists between
requests.
Application code only runs in response to a web request, a queued task, or a
scheduled task, and must return response data within 30 seconds in any
case. A request handler cannot spawn a sub-process or execute code after
the response has been sent.
The Go Runtime Environment
App Engine's Go runtime environment provides a convenient way to implement and
deploy web applications written in theGo Programming Language.
The Go runtime environment uses Gorelease r58.1. The SDK includes the Go
compiler and standard library, so it has no additional dependencies. As with the Java
and Python environments, not all the standard library's functionality is available
inside the sandbox. For example, attempts to open a socket or write to a file will
return an os.EINVAL error.
The SDK includes an automated build service to compile your app, so you'll neverneed to invoke the compiler yourself. Andas with the Python SDKyour app will
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be automatically re-built whenever you change the source. This keeps you
productive by making the edit-compile-run cycle refreshingly short.
The Go environment provides idiomaticGo APIsfor most of the App Engine
services.
You can upload other third-party libraries with your application, as long as they are
implmented in pure Go.
The Java Runtime Environment
You can develop your application for the Java runtime environment using common
Java web development tools and API standards. Your app interacts with the
environment usingthe Java Servlet standard, and can use common web application
technologies such asJavaServer Pages(JSPs).
The Java runtime environment uses Java 6. The App Engine Java SDK supports
developing apps using either Java 5 or 6.
The environment includes theJava SE Runtime Environment (JRE) 6 platformand
libraries. The restrictions of the sandbox environment are implemented in the JVM.
An app can use any JVM bytecode or library feature, as long as it does not exceed
the sandbox restrictions. For instance, bytecode that attempts to open a socket or
write to a file will throw a runtime exception.
Your app accesses most App Engine services using Java standard APIs. For the
App Engine datastore, the Java SDK includes implementations of theJava Data
Objects(JDO) andJava Persistence API(JPA) interfaces. Your app can usethe
JavaMail APIto send email messages with the App Engine Mail service.
The java.net HTTP APIs access the App Engine URL fetch service. App Engine also
includes low-level APIs for its services to implement additional adapters, or to use
directly from the application. See the documentation forthe
datastore,memcache,URL fetch,mail,imagesandGoogle AccountsAPIs.
Typically, Java developers use the Java programming language and APIs to
implement web applications for the JVM. With the use of JVM-compatible compilers
or interpreters, you can also use other languages to develop web applications, such
as JavaScript, Ruby, or Scala.
The Python Runtime Environment
With App Engine's Python runtime environment, you can implement your app using
the Python programming language, and run it on an optimized Python interpreter.
App Engine includes rich APIs and tools for Python web application development,
including a feature rich data modeling API, an easy-to-use web application
framework, and tools for managing and accessing your app's data. You can also
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take advantage of a wide variety of mature libraries and frameworks for Python web
application development, such asDjango.
The Python runtime environment uses Python version 2.5.2. Additional support for
Python 3 is being considered for a future release.
The Python environment includesthe Python standard library. Of course, not all of
the library's features can run in the sandbox environment. For instance, a call to a
method that attempts to open a socket or write to a file will raise an exception. For
convenience, several modules in the standard library whose core features are not
supported by the runtime environment have been disabled, and code that imports
them will raise an error.
Application code written for the Python environment must be written exclusively in
Python. Extensions written in the C language are not supported.
The Python environment provides rich Python APIs forthe datastore,Google
Accounts,URL fetch, andemailservices. App Engine also provides a simple Python
web application framework calledwebappto make it easy to start building
applications.
You can upload other third-party libraries with your application, as long as they are
implemented in pure Python and do not require any unsupported standard library
modules.
The Datastore
App Engine provides a distributed data storage service that features a query engine
and transactions. Just as the distributed web server grows with your traffic, the
distributed datastore grows with your data. You have the choice between two
different data storage options differentiated by their availability and consistency
guarantees.
The App Engine datastore is not like a traditional relational database. Data objects,
or "entities," have a kind and a set of properties. Queries can retrieve entities of a
given kind filtered and sorted by the values of the properties. Property values can be
of any of the supportedproperty value types.
Datastore entities are "schemaless." The structure of data entities is provided by and
enforced by your application code. The Java JDO/JPA interfaces and the Python
datastore interface include features for applying and enforcing structure within your
app. Your app can also access the datastore directly to apply as much or as little
structure as it needs.
The datastore is stronglyconsistentand usesoptimistic concurrency control. An
update of a entity occurs in a transaction that is retried a fixed number of times if
other processes are trying to update the same entity simultaneously. Your
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application can execute multiple datastore operations in a single transaction which
either all succeed or all fail, ensuring the integrity of your data.
The datastore implements transactions across its distributed network using "entity
groups." A transaction manipulates entities within a single group. Entities of the
same group are stored together for efficient execution of transactions. Yourapplication can assign entities to groups when the entities are created.
Google Accounts
App Engine supports integrating an app with Google Accounts for user
authentication. Your application can allow a user to sign in with a Google account,
and access the email address and displayable name associated with the account.
Using Google Accounts lets the user start using your application faster, because the
user may not need to create a new account. It also saves you the effort of
implementing a user account system just for your application.
If your application is running under Google Apps, it can use the same features with
members of your organization and Google Apps accounts.
The Users API can also tell the application whether the current user is a registered
administrator for the application. This makes it easy to implement admin-only areas
of your site.
App Engine Services
App Engine provides a variety of services that enable you to perform common
operations when managing your application. The following APIs are provided to
access these services:
URL Fetch
Applications can access resources on the Internet, such as web services or other
data, using App Engine's URL fetch service. The URL fetch service retrieves web
resources using the same high-speed Google infrastructure that retrieves web pages
for many other Google products.
Mail
Applications can send email messages using App Engine's mail service. The mail
service uses Google infrastructure to send email messages
Memcache
The Memcache service provides your application with a high performance in-
memory key-value cache that is accessible by multiple instances of your application.
Memcache is useful for data that does not need the persistence and transactional
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features of the datastore, such as temporary data or data copied from the datastore
to the cache for high speed access.
Image Manipulation
The Image service lets your application manipulate images. With this API, you canresize, crop, rotate and flip images in JPEG and PNG formats.
Scheduled Tasks and Task Queues
An application can perform tasks outside of responding to web requests. Your
application can perform these tasks on a schedule that you configure, such as on a
daily or hourly basis. Or, the application can perform tasks added to a queue by the
application itself, such as a background task created while handling a request.
Scheduled tasks are also known as "cron jobs," handled by the Cron service. For
more information on using the Cron service, see thePythonorJavacron
documentation.
Task queues are currently released as an experimental feature. The Python, Java,
and Go runtime environments can use task queues. For information about the task
queue service, seethe Python API documentation,the Java API documentationor
thethe Go API documentation.
Development Workflow
The App Engine software development kits(SDKs) for Java, Python, and Go eachinclude a web server application that emulates all of the App Engine services on yourlocal computer. Each SDK includes all of the APIs and libraries available on AppEngine. The web server also simulates the secure sandbox environment, includingchecks for attempts to access system resources disallowed in the App Engineruntime environment.
Each SDK also includes a tool to upload your application to App Engine. Once youhave created your application's code, static files and configuration files, you run thetool to upload the data. The tool prompts you for your Google account email addressand password.
When you build a new major release of an application that is already running on AppEngine, you can upload the new release as a new version. The old version willcontinue to serve users until you switch to the new version. You can test the newversion on App Engine while the old version is still running.
The Java SDK runs on any platform with Java 5 or Java 6. The SDK is available as aZip file. If you use the Eclipse development environment, you can use theGooglePlugin for Eclipseto create, test and upload App Engine applications. The SDK alsoincludes command-line tools for running the development server and uploading yourapp.
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The Python SDK is implemented in pure Python, and runs on any platform withPython 2.5, including Windows, Mac OS X and Linux. The SDK is available as a Zipfile, and installers are available for Windows and Mac OS X.
The Go SDK features an idiomatic, native Go API for using the App Engine services,
and uses the same tools as the Python SDK (with some additional machinery forautomatically compiling your Go apps). The Go SDK is stand-aloneyou do notneed to install Go separatelyand is available as a Zip file for both Mac OS X andLinux (a Windows version will be available soon
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Case Study On Microsoft Azure
Microsoft Windows Azure Cloud Computing Service
Microsoft Azure offers cloud computing SaaS as well as a pay-as-you-go
infrastructure usage. Azure essentially is infrastructure as a service that enablesusers to only utilize infrastructure resources as they are needed. Windows Azure
offers cloud computing in the .NET platform and offersMicrosoft .NET
Services,Microsoft SQL Services,Microsoft Online Services,SharePoint
Services, andDynamics CRMServices. In comparison to othercloud computing
servicessuch asAmazon EC2,GoGrid, and Google App Engine,Microsoft
Windows Azurehas a high level of security in addition to a 99.95% compute
reliability and 99.9% role instance and storage reliability.
Azure Software as a Service (SaaS)
Microsoft has integrated services such asSharePointandCRMthat are offered with
its cloud computing service Azure in order to make theonline applicationsmost
frequently used by businesses readily available on a cloud infrastructure. Microsoft
utilizes a unique server balancing act that enables users to switch to another server
backup if one service becomes unavailable. Fabric Controller technology reroutes
work instantaneously if a server goes down, resulting in 99.9% - 99.95% uptime.
Although Microsoft Azure basic package supports the .NET environment, Microsoft
Business Edition supports more platforms and can be used with both Microsoft
technologies in conjunction with Mac and other platforms. Microsoft may haveentered the Cloud Computing arena later in the game, but the superior service they
offer was well worth the wait.
With a powerful SQL Azure database coupled with competitive pricing and enterprise
scalability, Azure already stacks up to the other existing Cloud Computing services
and gives them a run for their computing.
Azure Pricing Guide
Pure pay-as-you-go:
$0.12 per hour for computing
$0.15 per gigabytes for storage
$0.10 per 10,000 storage transactions
SQL Azure database:
$9.99 - basic Web edition (1 gigabyte relational database)
$99.99 - Business Edition (10 gigabytes database)
Network bandwidth:
$0.10-$0.15 per gigabyte
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Microsoft Windows Azure Cloud Computing Case Study
Microsoft's Azure is still technically in the beta phase, but there are case studies
available that detail the results that Microsoft Cloud Computing is already having on
businesses that are utilizing the service. Here is an example of a case study
that demonstrates the impact that Azure had for the IT Services company Epicor:
Epicor | Profile: $480 Million, private company that offers software solutions for
small to mid-size companies in the manufacturing, distribution, service, retail, and
hospitality industries.
What did Azure do for Epicor?: Azure significantly cut costs for the company by
lowering their development costs. It allowed them to offer their customers internet-
based services and build on their developers familiarity with the Microsoft .NET
Framework.
Epicor also had the capability to publish the application's search indexes in
the cloud so remote users can run the application on a laptop or mobile
device to get into the systeminstead they have VPN access.
By developing its new ERP application on Azure, Epicor was able to lower its
development costs and offer its customers internet-based services.
Azure allowed Epicor to build an Enterprise Search on the internet without
having to build out data center environments, which made for much lower
development overhead.