issue logic and power/performance tradeoffs
DESCRIPTION
Issue Logic and Power/Performance Tradeoffs. Edwin Olson Andrew Menard December 5, 2000. The need for low-power architectures. Low performance - PIMs High performance – video decoding/MP3 playback And increasingly , both. How do you design an architecture that can do both?. - PowerPoint PPT PresentationTRANSCRIPT
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Issue Logic and Power/Performance TradeoffsEdwin OlsonAndrew Menard
December 5, 2000
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The need for low-power architecturesLow performance - PIMsHigh performance video decoding/MP3 playbackAnd increasingly, both.How do you design an architecture that can do both?
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A couple alternativesHigh performance processor that can be lobotomizedModify Issue LogicChange structure sizesTwo separate coresA high performance/high-power coreA low performance/low-power core
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Other power throttling mechanismsVoltage scalingHuge power savingsTheres a limit & high performance designs are pushing towards low voltage which doesnt leave much room for throttling.Burn & CoastCompute at full speed, and then go into a sleep mode. Simple linear power/performance throttling.
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MethodologySimpleScalar/WattchWidely used but little/no verification. Several power models available, but very large margins of error. Still, the size of structures is correlated to power consumption.Industry surveyLook at real-world processors with the range of characteristics of interest.SpecInt95Substantially reduced input sets to make simulation feasible.
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Issue Window ScalingPopular idea- its a highly active chip structure. Window responsible for 20% of non-clock power (Alpha 21264 & Wattch agree)Does it work?Lets look at RUU usageWhats an upper bound on the useful size?How do smaller sizes impact performance and power?
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RUU size upper boundsModified SimpleScalar, let RUU be arbitrarily big.
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4x44x84x164x324x644x128
CPI0.9141.31.481.51.51.5
Power71.772.774.578.282.288.6
15.81311.812.814.116.2
8x88x168x328x648x128
CPI1.311.581.611.611.61
Power95.1100.4108.2117.5136
1412.813.715.2518.34
IPC4x44x84x164x324x64
8x88x168x328x64
48163264
li0.9141.31.481.51.532 "big enough"0.9141.31.481.51.5
1.341.621.671.670.8041.011.091.091.09
0.9971.51.81.861.86
perl0.8041.011.091.091.0916 "big enough"
1.091.211.231.23
compress0.9971.51.81.861.8632 "big enough"
1.542.032.162.16
8163264
1.341.621.671.67
1.091.211.231.23
1.542.032.162.16
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li
perl
compress
RUU Capacity
IPC
IPC vs RUU size for 4-issue
000
000
000
000
li
perl
compress
RUU Capacity
IPC
IPC vs RUU size for 8-issue
000
000
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li
perl
compress
RUU Occupancy
Cycles
RUU Usage
0000
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li
perl
compress
mk88sim
RUU Occupancy
Fraction of Cycles
RUU Usage
Chart2
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111
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li
perl
compress
mk88sim
RUU Occupancy
Fraction of Cycles
8-issue
Chart3
37817481957894945971
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li
perl
compress
RUU Occupancy
Cycles
RUU Usage for 8 issue
Sheet1
03692079
1861150
2817437
3751118
41717329
5587424
6442428
7477123
877020703692079
99984451861150036922910373768903880492perl usage statscompress usage stats
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CPI0.9141.31.481.51.51.5
Power71.772.774.578.282.288.6
15.81311.812.814.116.2
8x88x168x328x648x128
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li
perl
compress
RUU Occupancy
Cycles
RUU Usage
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perl
compress
RUU Capacity
IPC
IPC vs RUU size for 4-issue
000
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li
perl
compress
RUU Capacity
IPC
IPC vs RUU size for 8-issue
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li
perl
compress
RUU Occupancy
Fraction of Cycles
-
Effect of bounded RUU sizeThe RUUs occupancy saturates as one would expect.
Chart2
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16 Entry RUU
Unlimited RUU
RUU Occupancy
Cycles
RUU Usage - li
Chart4
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16 Entry RUU
Unlimited RUU
RUU Occupancy
Cycles
RUU Usage for li
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4x44x84x164x324x644x128
CPI0.9141.31.481.51.51.5
Power71.772.774.578.282.288.6
15.81311.812.814.116.2
8x88x168x328x648x128
CPI1.311.581.611.611.61
Power95.1100.4108.2117.5136
1412.813.715.2518.34
IPC4x44x84x164x324x64
8x88x168x328x64
48163264
li0.9141.31.481.51.532 "big enough"0.9141.31.481.51.5
1.341.621.671.670.8041.011.091.091.09
0.9971.51.81.861.86
perl0.8041.011.091.091.0916 "big enough"
1.091.211.231.23
compress0.9971.51.81.861.8632 "big enough"
1.542.032.162.16
8163264
1.341.621.671.67
1.091.211.231.23
1.542.032.162.16
8 issueliperlcompress
037817481957894945971
1932777632916250648
271428463778026555
3710396450520111550
41461213886844116989
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Sheet1
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Sheet2
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Sheet3
000
000
000
000
000
li
perl
compress
RUU Capacity
IPC
IPC vs RUU size for 4-issue
000
000
000
000
li
perl
compress
RUU Capacity
IPC
IPC vs RUU size for 8-issue
000
000
000
000
000
000
000
000
000
000
000
000
000
000
000
000
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000
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li
perl
compress
RUU Occupancy
Cycles
RUU Usage for 8 issue
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
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0
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0
0
0
0
0
0
0
0
16 Entry RUU
Unlimited RUU
RUU Occupancy
Cycles
RUU Usage
-
Effect of Bounded RUU Size
Chart2
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0.09268570260.2031635340.21972192240.22112410350.2211822025
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40.36952025360.40556800880.40925204210.4093609029
50.38513080820.42449357130.42864642920.4287597408
60.40802147970.44785248010.45113201810.4512356112
70.43564837620.46733657780.47217380170.4722942931
810.49730447930.50257948040.5026820741
990.51603465680.52043097490.520553774
10100.54766124980.54876627250.548913014
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161610.8507788640.8509708207
1717170.88016092730.8803936427
1818180.89456157980.8947765174
1919190.91050198520.9107152952
2020200.92945130710.9296721249
2121210.95581538010.9560442623
2222220.96645174730.9666811873
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424242420.9993205161
434343430.9994710751
444444440.9995269823
454545450.9995973582
464646460.9996702205
474747470.999700505
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515151510.9997751974
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616161610.9999321794
626262620.9999322484
636363630.9999323175
646464641
4
8
16
32
64
RUU Size
Fraction of cycles
mk88sim on 4-issue
Sheet1
RUU Occupancym88ksim
4x44x84x164x324x648x88x168x328x64
2250076551348949827824909495490637346563544482627422676142190582250076551348949827824909495490637346563544482627422676142190580.04851659070.15108876340.16722101810.16938334670.169426299400.13461187550.16755034430.17278619330.1728193723
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43861346377455364917212979758228984520289511643459096026753911244623772439100711110.9997382138491110.9990947076
389737646377455364917212979758228984520289515533459096026753911244623772439838311110.9997516467501110.9993968404
682251146377455364917212979758228984520289522353459096026753911244623772440089411110.9997751974511110.999499695
496370146377455364917212979758228984520289527313459096026753911244623772440459511110.9997923253521110.9996512939
365195146377455364917212979758228984520289530963459096026753911244623772440654611110.9998049294531110.99973121
61325246377455364917212979758228984520289537093459096026753911244623772440679811110.9998260974541110.9997415323
2674337746377455364917212979758228984520289563833459096026753911244623772441017511110.9999184357551110.9998798596
223046377455364917212979758228984520289564053459096026753911244623772441020511110.9999191954561110.9998810885
7510146377455364917212979758228984520289564803459096026753911244623772441030611110.9999217853571110.9998852256
26016346377455364917212979758228984520289567403459096026753911244623772441046911110.9999307636581110.9998919023
737946377455364917212979758228984520289567473459096026753911244623772441084811110.9999310053591110.9999074268
272046377455364917212979758228984520289567743459096026753911244623772441086811110.9999319377601110.999908246
713246377455364917212979758228984520289567813459096026753911244623772441100011110.9999321794611110.9999136529
2046377455364917212979758228984520289567833459096026753911244623772441100011110.9999322484621110.9999136529
2846377455364917212979758228984520289567853459096026753911244623772441100811110.9999323175631110.9999139806
1960210046377455364917212979758228984520289587453459096026753911244623772441310811111641111
Totals:
46377455364917212979758228984520289587450345909602675391124462377244131080
Sheet1
4
8
16
32
64
RUU Size
Fraction of cycles
mk88sim on 4-issue
Sheet2
8
16
32
64
RUU Size
Fraction of cycles
mk88sim on 8-issue
Sheet3
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1111
1111
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li
perl
compress
mk88sim
RUU Occupancy
Fraction of Cycles
RUU Usage
MBD00021878.xls
Chart3
00.2199817860.0866727826
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0.39886311840.72380632820.3019751802
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0.58520505830.84502504010.4225932804
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