[Webkit-unassigned] [Bug 67798] DFG JIT completely undoes speculative compilation even in the case of a partial static speculation failure
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Thu Sep 8 14:39:33 PDT 2011
https://bugs.webkit.org/show_bug.cgi?id=67798
--- Comment #3 from Filip Pizlo <fpizlo at apple.com> 2011-09-08 14:39:33 PST ---
Looks like this path will work best if it is turned off for static speculation, but turned on for dynamic speculation. Here's the performance with it turned off. Note the noise (38% speed-up on one SunSpider benchmark that gets totally lost in the average). I'm convinced that it is in fact noise and not real.
Benchmark report for SunSpider, V8, and Kraken.
VMs tested:
"TipOfTree" at /Volumes/Data/pizlo/quinary/OpenSource/WebKitBuild/Release/jsc
"PartialSpecFailOff" at /Volumes/Data/pizlo/octonary/OpenSource/WebKitBuild/Release/jsc
Collected 12 samples per benchmark/VM, with 4 VM invocations per benchmark. Used 1 benchmark iteration per VM
invocation for warm-up. Used the jsc-specific preciseTime() function to get microsecond-level timing. Reporting
benchmark execution times with 95% confidence intervals in milliseconds.
TipOfTree PartialSpecFailOff
SunSpider:
3d-cube 7.7127+-0.1331 ? 7.8798+-0.2091 ? might be 1.0217x slower
3d-morph 7.5139+-0.1326 ? 7.5244+-0.2035 ?
3d-raytrace 7.3208+-0.1767 ? 7.5204+-0.2760 ? might be 1.0273x slower
access-binary-trees 2.3967+-0.0970 2.2549+-0.0498 might be 1.0629x faster
access-fannkuch 11.9275+-0.2377 11.8759+-0.1481
access-nbody 4.2453+-0.0602 ? 4.2470+-0.0751 ?
access-nsieve 2.5830+-0.0807 2.4702+-0.0412 might be 1.0457x faster
bitops-3bit-bits-in-byte 1.7405+-0.0422 ? 1.7923+-0.0560 ? might be 1.0298x slower
bitops-bits-in-byte 4.5369+-0.1687 ^ 3.2834+-0.0690 ^ definitely 1.3817x faster
bitops-bitwise-and 3.6754+-0.0649 3.6354+-0.0616 might be 1.0110x faster
bitops-nsieve-bits 5.3928+-0.1547 ? 5.5196+-0.1109 ? might be 1.0235x slower
controlflow-recursive 2.0130+-0.0451 ? 2.0507+-0.0368 ? might be 1.0187x slower
crypto-aes 6.6134+-0.2576 6.6038+-0.1874
crypto-md5 2.8496+-0.1166 ? 2.9049+-0.1234 ? might be 1.0194x slower
crypto-sha1 2.2437+-0.0694 ? 2.3244+-0.0596 ? might be 1.0360x slower
date-format-tofte 10.1987+-0.2700 ? 10.2935+-0.2483 ?
date-format-xparb 9.0265+-0.2755 8.9221+-0.3400 might be 1.0117x faster
math-cordic 6.2957+-0.0972 ? 6.4081+-0.1749 ? might be 1.0179x slower
math-partial-sums 7.7582+-0.1480 ? 7.8717+-0.1562 ? might be 1.0146x slower
math-spectral-norm 2.5476+-0.0818 ? 2.5812+-0.1030 ? might be 1.0132x slower
regexp-dna 10.6437+-0.2123 10.3263+-0.1333 might be 1.0307x faster
string-base64 6.1379+-0.2106 6.0649+-0.1760 might be 1.0120x faster
string-fasta 7.4621+-0.1615 ? 7.5237+-0.1623 ?
string-tagcloud 12.0855+-0.2801 ? 12.3640+-0.3423 ? might be 1.0230x slower
string-unpack-code 19.0547+-0.2942 ? 19.1257+-0.4011 ?
string-validate-input 7.2033+-0.2369 7.0648+-0.2110 might be 1.0196x faster
<arithmetic> 6.5838+-0.0390 6.5551+-0.0416
<geometric> 5.4789+-0.0256 5.4260+-0.0289
<harmonic> 4.4947+-0.0220 4.4438+-0.0304 might be 1.0114x faster
TipOfTree PartialSpecFailOff
V8:
crypto 90.9512+-0.7022 ^ 86.9512+-0.4698 ^ definitely 1.0460x faster
deltablue 264.5347+-0.9710 ? 267.4549+-2.0893 ? might be 1.0110x slower
earley-boyer 93.9388+-0.3832 93.3699+-0.2572
raytrace 78.7379+-0.7401 77.6151+-0.4294 might be 1.0145x faster
regexp 110.2534+-0.8725 ? 111.8147+-1.1356 ? might be 1.0142x slower
richards 237.0448+-1.9937 ? 240.2445+-1.7043 ? might be 1.0135x slower
splay 102.7832+-0.4053 ? 103.1920+-1.1310 ?
<arithmetic> 139.7491+-0.4324 ? 140.0917+-0.4421 ?
<geometric> 125.0396+-0.3620 124.6279+-0.3570
<harmonic> 114.4838+-0.3624 ^ 113.5691+-0.3540 ^ definitely 1.0081x faster
TipOfTree PartialSpecFailOff
Kraken:
ai-astar 1111.5817+-10.0950 1100.4044+-7.0387 might be 1.0102x faster
audio-beat-detection 484.9305+-3.8803 479.5919+-2.9518 might be 1.0111x faster
audio-dft 423.4744+-4.5484 420.9447+-2.8184
audio-fft 377.1075+-2.9333 374.8421+-2.5561
audio-oscillator 381.5580+-2.0830 380.4500+-2.6626
imaging-darkroom 540.4795+-3.7662 ^ 531.7605+-2.5730 ^ definitely 1.0164x faster
imaging-desaturate 616.7875+-7.1272 ? 617.7079+-7.1100 ?
imaging-gaussian-blur 1732.4610+-3.6755 ? 1739.1962+-16.1256 ?
json-parse-financial 49.6394+-0.4810 49.6081+-0.2538
json-stringify-tinderbox 68.6684+-0.7766 ? 68.9953+-0.7159 ?
stanford-crypto-aes 146.0314+-3.3339 144.2934+-1.3057 might be 1.0120x faster
stanford-crypto-ccm 112.5396+-0.6479 ? 113.2355+-0.9298 ?
stanford-crypto-pbkdf2 339.8969+-3.1305 339.6628+-2.0729
stanford-crypto-sha256-iterative 132.6277+-1.3897 132.0876+-1.3444
<arithmetic> 465.5560+-0.7448 463.7700+-1.9575
<geometric> 299.9983+-0.5828 298.8703+-0.7334
<harmonic> 185.2166+-0.6885 184.9963+-0.6590
TipOfTree PartialSpecFailOff
All benchmarks:
<arithmetic> 163.1321+-0.2674 162.6352+-0.5690
<geometric> 28.7626+-0.0819 ^ 28.5624+-0.0863 ^ definitely 1.0070x faster
<harmonic> 7.9373+-0.0381 7.8488+-0.0527 might be 1.0113x faster
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