[Webkit-unassigned] [Bug 65901] The JSC JIT currently has no facility to profile and report the types of values
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Tue Aug 9 01:12:31 PDT 2011
https://bugs.webkit.org/show_bug.cgi?id=65901
--- Comment #5 from Filip Pizlo <fpizlo at apple.com> 2011-08-09 01:12:31 PST ---
Here is sample profiling output when this feature is enabled. Note that this is most useful if s_dumpsGeneratedCode is set to true.
ValueProfile for 0x7fefc2021600:
arg = 1: samples = 3, int32 = 64, double = 0, cell = 0
bc = 105: samples = 3, int32 = 0, double = 64, cell = 0
bc = 109: samples = 3, int32 = 0, double = 64, cell = 0
bc = 129: samples = 3, int32 = 0, double = 64, cell = 0
bc = 133: samples = 3, int32 = 0, double = 64, cell = 0
bc = 159: samples = 2, int32 = 0, double = 0, cell = 64
bc = 177: samples = 3, int32 = 0, double = 64, cell = 0
ValueProfile for 0x7fefc202d800:
arg = 1: samples = 8, int32 = 0, double = 0, cell = 64
arg = 2: samples = 8, int32 = 0, double = 0, cell = 64
arg = 3: samples = 8, int32 = 0, double = 0, cell = 64
ValueProfile for 0x7fefc204ca00:
arg = 1: samples = 8, int32 = 0, double = 0, cell = 64
arg = 2: samples = 8, int32 = 0, double = 0, cell = 64
bc = 33: samples = 8, int32 = 0, double = 64, cell = 0
bc = 35: samples = 8, int32 = 0, double = 64, cell = 0
bc = 54: samples = 8, int32 = 64, double = 0, cell = 0
bc = 72: samples = 8, int32 = 64, double = 0, cell = 0
ValueProfile for 0x7fefc2037e00:
arg = 1: samples = 8, int32 = 0, double = 0, cell = 64
arg = 2: samples = 8, int32 = 0, double = 0, cell = 64
bc = 33: samples = 8, int32 = 0, double = 64, cell = 0
bc = 35: samples = 8, int32 = 0, double = 64, cell = 0
bc = 54: samples = 8, int32 = 64, double = 0, cell = 0
bc = 72: samples = 8, int32 = 64, double = 0, cell = 0
ValueProfile for 0x7fefc2042400:
arg = 1: samples = 8, int32 = 64, double = 0, cell = 0
arg = 2: samples = 8, int32 = 64, double = 0, cell = 0
ValueProfile for 0x7fefc2011000:
bc = 22: samples = 3, int32 = 0, double = 64, cell = 0
Here is the performance impact when this is enabled.
[pizlo at minime bencher] ./bencher TipOfTree:/Volumes/Data/pizlo/quinary/OpenSource/WebKitBuild/Release/jsc ValueProfiler:/Volumes/Data/pizlo/OpenSource/WebKitBuild/Release/jsc
TipOfTree: /Volumes/Data/pizlo/quinary/OpenSource/WebKitBuild/Release/jsc
ValueProfiler: /Volumes/Data/pizlo/OpenSource/WebKitBuild/Release/jsc
376/376
TipOfTree ValueProfiler
SunSpider:
3d-cube 8.3063+-0.2447 ? 8.5934+-0.1407 ? might be 1.0346x slower
3d-morph 7.4778+-0.1030 ? 7.4816+-0.1469 ?
3d-raytrace 8.6724+-0.1935 ! 9.8602+-0.1691 ! definitely 1.1370x slower
access-binary-trees 2.1589+-0.1113 ? 2.3136+-0.0478 ? might be 1.0717x slower
access-fannkuch 11.5040+-0.1137 ! 12.4823+-0.3213 ! definitely 1.0850x slower
access-nbody 6.3985+-0.0758 ! 6.9130+-0.1413 ! definitely 1.0804x slower
access-nsieve 3.4068+-0.1366 ? 3.5767+-0.0992 ? might be 1.0499x slower
bitops-3bit-bits-in-byte 2.4047+-0.0435 ! 2.6037+-0.0567 ! definitely 1.0827x slower
bitops-bits-in-byte 6.4718+-0.1681 ^ 5.9623+-0.1465 ^ definitely 1.0855x faster
bitops-bitwise-and 3.8309+-0.1916 3.6319+-0.1368 might be 1.0548x faster
bitops-nsieve-bits 5.3318+-0.1112 ! 5.7348+-0.0813 ! definitely 1.0756x slower
controlflow-recursive 2.0706+-0.0608 ! 2.4789+-0.0614 ! definitely 1.1972x slower
crypto-aes 6.8621+-0.2065 ! 7.5240+-0.1857 ! definitely 1.0965x slower
crypto-md5 2.9301+-0.0914 ! 3.2301+-0.0483 ! definitely 1.1024x slower
crypto-sha1 2.4821+-0.0480 ! 2.7375+-0.0685 ! definitely 1.1029x slower
date-format-tofte 10.8158+-0.2540 ! 11.4041+-0.2644 ! definitely 1.0544x slower
date-format-xparb 8.5976+-0.1805 ? 8.7141+-0.2467 ? might be 1.0135x slower
math-cordic 6.1759+-0.0928 ! 6.4378+-0.1011 ! definitely 1.0424x slower
math-partial-sums 7.4856+-0.1438 7.4773+-0.1746
math-spectral-norm 3.6331+-0.0976 ? 3.7043+-0.0446 ? might be 1.0196x slower
regexp-dna 10.3002+-0.1749 ? 10.3529+-0.1731 ?
string-base64 5.3835+-0.1827 ? 5.5308+-0.1230 ? might be 1.0274x slower
string-fasta 7.0906+-0.1808 ? 7.2920+-0.1131 ? might be 1.0284x slower
string-tagcloud 13.3704+-0.1666 ? 13.6297+-0.2870 ? might be 1.0194x slower
string-unpack-code 18.5704+-0.3188 18.4064+-0.3542
string-validate-input 6.5386+-0.2296 ? 6.9250+-0.2225 ? might be 1.0591x slower
<arithmetic> 6.8566+-0.0509 ! 7.1153+-0.0401 ! definitely 1.0377x slower
<geometric> 5.8633+-0.0477 ! 6.1364+-0.0315 ! definitely 1.0466x slower
<harmonic> 4.9473+-0.0516 ! 5.2478+-0.0235 ! definitely 1.0607x slower
TipOfTree ValueProfiler
V8:
crypto 196.2462+-0.8045 ! 207.3415+-3.2399 ! definitely 1.0565x slower
deltablue 232.2978+-0.9027 ! 290.4061+-2.9151 ! definitely 1.2501x slower
earley-boyer 105.3592+-1.3546 ! 116.9401+-0.5730 ! definitely 1.1099x slower
raytrace 69.5510+-0.3109 ! 81.2216+-0.6053 ! definitely 1.1678x slower
regexp 109.0020+-0.9485 ^ 107.3776+-0.3122 ^ definitely 1.0151x faster
richards 228.9386+-1.6412 ! 273.4472+-1.4395 ! definitely 1.1944x slower
splay 106.8907+-0.9253 ! 109.6614+-0.9588 ! definitely 1.0259x slower
<arithmetic> 149.7551+-0.2917 ! 169.4851+-1.0179 ! definitely 1.1317x slower
<geometric> 136.6708+-0.3215 ! 151.6047+-0.7487 ! definitely 1.1093x slower
<harmonic> 124.6122+-0.3511 ! 136.6541+-0.5536 ! definitely 1.0966x slower
TipOfTree ValueProfiler
Kraken:
ai-astar 1340.1625+-6.2365 ! 1397.7431+-8.9674 ! definitely 1.0430x slower
audio-beat-detection 452.7537+-3.6013 ! 484.9311+-2.7704 ! definitely 1.0711x slower
audio-dft 429.3198+-10.7121 ! 465.6006+-13.4208 ! definitely 1.0845x slower
audio-fft 363.0736+-3.1600 ! 378.7463+-2.4603 ! definitely 1.0432x slower
audio-oscillator 341.5923+-3.0383 ! 379.5388+-3.6162 ! definitely 1.1111x slower
imaging-darkroom 534.9634+-3.7337 ! 551.2264+-1.2353 ! definitely 1.0304x slower
imaging-desaturate 540.4312+-2.7447 ! 561.6124+-2.8461 ! definitely 1.0392x slower
imaging-gaussian-blur 1970.0386+-16.3271 ! 2255.7230+-6.6906 ! definitely 1.1450x slower
json-parse-financial 48.0352+-0.1714 ? 48.4602+-0.2799 ?
json-stringify-tinderbox 63.4177+-0.8523 62.5026+-0.4275 might be 1.0146x faster
stanford-crypto-aes 144.5496+-1.8578 ! 158.5244+-1.4645 ! definitely 1.0967x slower
stanford-crypto-ccm 110.7869+-0.3804 ! 120.0760+-0.5221 ! definitely 1.0838x slower
stanford-crypto-pbkdf2 392.7411+-2.1725 ! 407.1917+-4.3448 ! definitely 1.0368x slower
stanford-crypto-sha256-iterative 145.6710+-0.8984 ! 150.2614+-0.5913 ! definitely 1.0315x slower
<arithmetic> 491.2526+-0.9934 ! 530.1527+-1.7205 ! definitely 1.0792x slower
<geometric> 301.4970+-0.9521 ! 318.7165+-1.0444 ! definitely 1.0571x slower
<harmonic> 181.4722+-0.8372 ! 187.5911+-0.3824 ! definitely 1.0337x slower
TipOfTree ValueProfiler
All benchmarks:
<arithmetic> 172.4275+-0.2891 ! 187.0964+-0.5749 ! definitely 1.0851x slower
<geometric> 30.3047+-0.1431 ! 32.0880+-0.1061 ! definitely 1.0588x slower
<harmonic> 8.7219+-0.0890 ! 9.2514+-0.0405 ! definitely 1.0607x slower
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