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Microarchitecting


MANA an Instruction PrefetcherAli Ansari SharifFatemehGolshanSharifPejmanLotfi-Kamran IPMHamid Sarbazi-Azad Sharif IPM2/ 18Instruction Cache MissesServer applicationsoMulti-megabyte instruction footpr

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Document on Subject : "Microarchitecting"— Transcript:

1 MANA: Microarchitecting an Instruction
MANA: Microarchitecting an Instruction Prefetcher Ali Ansari (Sharif) Fatemeh Golshan (Sharif) Pejman Lotfi - Kamran (IPM) Hamid Sarbazi - Azad (Sharif, IPM) 2 / 18 Instruction Cache Misses •

2 Server applications o Multi - megabyte
Server applications o Multi - megabyte i nstruction f ootprint o 25 % increase in size per year [ Kanev , ISCA ’ 15 ] • Limited capacity L 1 instruction cache o 512 blocks, 32 KB Frequent

3 L 1 i misses hurt performance! 3 / 18
L 1 i misses hurt performance! 3 / 18 Prior Work Significant storage cost or uncovered potential! 4 / 18 Contributions • Storage cost is important o U nlimited storage results in high speedup

4 Prefetching records o A few distinct r
Prefetching records o A few distinct records o Low storage demand per record • MANA o 4 K distinct prefetching records, on average o E ach record ≈ 4 bytes o 24 % and 26.6 % speedup with

5 16.3 and 122 KB MANA offers considera
16.3 and 122 KB MANA offers considerable speedup with a limited storage! 5 / 18 Outline • Introduction • Motivation • Our Proposal, MANA Prefetcher • Methodology • Evaluation • Conclu

6 sion 6 / 18 Motivation • Spatial regi
sion 6 / 18 Motivation • Spatial region o Trigger address + a footprint • Advantages o Covering a large address space  Few distinct prefetching records o Easily detectable  Simple design

7 • Widely used in prior work o PIF [ F
• Widely used in prior work o PIF [ Ferdman , MICRO ’ 11 ] o RDIP [ Kolli , MICRO ’ 13 ] o Shotgun [Kumar, ASPLOS ’ 18 ] Spatial region is a good prefetching record! 7 / 18 Motivation (co

8 nt.) • Spatial region ’ s challenges
nt.) • Spatial region ’ s challenges: o Finding the successor, why?  Prefetching the trigger block  Timeliness o Storage cost  T rigger address = block address! • Prior work cannot s

9 olve these challenges effectively • MA
olve these challenges effectively • MANA offers simple solutions for them MANA microarchitects the use of spatial regions! 8 / 18 MANA • S patial region is the main prefetching record o No asso

10 ciation with other events • MANA_Table
ciation with other events • MANA_Table o A set - associative table to hold spatial regions o Looked up by trigger addresses • Finding the successor o The sequence of spatial regions is repetit

11 ive (PIF) o Use a pointer to the success
ive (PIF) o Use a pointer to the successor spatial region o Chase the pointers to discover successor spatial regions MANA: (Spatial region + a pointer) in a set - associative table! 9 / 18 MANA: Hig

12 h - Order Bit Patterns Block Offset Set
h - Order Bit Patterns Block Offset Set Number Instruction Address Tag 10 / 18 MANA: High - Order Bit Patterns Block Offset Set Number HOBP Instruction Address Partial Tag 11 / 18 MANA: High - O

13 rder Bit Patterns Block Offset Set Numb
rder Bit Patterns Block Offset Set Number HOBP Instruction Address Partial Tag b ’ 01 Partial Tag HOBP index 100 HOBPs ’ Table 0 xffa 358 f 12 b 100 12 / 18 MANA: Recording 13 / 18 MANA: Rep

14 laying 14 / 18 Methodology • ChampSim
laying 14 / 18 Methodology • ChampSim Simulator • Default parameters • 32 KB, 8 - way, L 1 instruction cache • 50 public traces • Warmup: 50 M instructions • Evaluation: 50 M ins

15 tructions • Competitors: RDIP, Shotgun
tructions • Competitors: RDIP, Shotgun, and PIF 15 / 18 Evaluation 1.00 1.05 1.10 1.15 1.20 1.25 1.30 8 KB 16 KB 128 KB 8 KB 16 KB 128 KB 8 KB 16 KB 128 KB 8 KB 16 KB 128 KB RDIP Shotgun PIF MANA

16 Speedup Better performance in all given
Speedup Better performance in all given storage budgets! 16 / 18 Evaluation (cont.) MANA can effectively prefetch for small cache sizes! 1.0 1.2 1.4 1.6 1.8 client 2 client 7 server 1 server 9 serve

17 r 12 server 16 server 29 server 36 spec
r 12 server 16 server 29 server 36 spec gcc-3 spec x264-1 Avrg. 10 Avrg. All Speedup 8 KB 16 KB 32 KB 17 / 18 Conclusion • MANA uses spatial regions • Spatial regions are chained with pointers t

18 o each other • HOBP is used to reduce
o each other • HOBP is used to reduce the storage cost • 24 % speedup with only 16.3 KB o Significant gap with prior work o More practical design • 26.6 % speedup with 122 KB Thank You! Any