このデータはSunSpiderをAtom Z560 (VAIO P) + Ubuntu 10.10上でのFirefox 4.0b9pre (2010-12-18)とGoogle Chrome 10.0.612.1 devで走らせた結果なんだけど、すごく興味深い。FROMはChromeでTOはFirefoxね。
TEST COMPARISON FROM TO DETAILS
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** TOTAL **: 1.38x as fast 1361.8ms +/- 5.4% 987.8ms +/- 1.0% significant
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3d: 1.41x as fast 224.0ms +/- 11.6% 158.5ms +/- 0.9% significant
cube: ?? 61.7ms +/- 23.3% 64.0ms +/- 1.8% not conclusive: might be *1.037x as slow*
morph: 1.48x as fast 47.2ms +/- 8.7% 31.9ms +/- 3.1% significant
raytrace: 1.84x as fast 115.1ms +/- 9.3% 62.6ms +/- 1.1% significant
access: - 130.6ms +/- 12.0% 128.7ms +/- 2.5%
binary-trees: *2.02x as slow* 9.7ms +/- 42.8% 19.6ms +/- 12.8% significant
fannkuch: 1.42x as fast 53.3ms +/- 18.4% 37.6ms +/- 2.7% significant
nbody: 1.73x as fast 48.4ms +/- 11.9% 27.9ms +/- 2.2% significant
nsieve: *2.27x as slow* 19.2ms +/- 7.6% 43.6ms +/- 2.5% significant
bitops: 1.77x as fast 87.6ms +/- 19.7% 49.5ms +/- 4.9% significant
3bit-bits-in-byte: 2.79x as fast 7.8ms +/- 5.8% 2.8ms +/- 10.8% significant
bits-in-byte: ?? 17.8ms +/- 37.5% 19.6ms +/- 3.1% not conclusive: might be *1.101x as slow*
bitwise-and: 4.19x as fast 30.6ms +/- 22.5% 7.3ms +/- 6.6% significant
nsieve-bits: 1.59x as fast 31.4ms +/- 14.6% 19.8ms +/- 8.3% significant
controlflow: 1.49x as fast 12.7ms +/- 14.0% 8.5ms +/- 5.9% significant
recursive: 1.49x as fast 12.7ms +/- 14.0% 8.5ms +/- 5.9% significant
crypto: 1.65x as fast 111.6ms +/- 6.8% 67.6ms +/- 1.1% significant
aes: 1.61x as fast 59.7ms +/- 14.7% 37.1ms +/- 2.8% significant
md5: 1.64x as fast 26.0ms +/- 7.3% 15.9ms +/- 1.4% significant
sha1: 1.77x as fast 25.9ms +/- 7.1% 14.6ms +/- 3.4% significant
date: 1.50x as fast 241.3ms +/- 3.7% 161.3ms +/- 1.4% significant
format-tofte: *1.116x as slow* 84.7ms +/- 8.2% 94.5ms +/- 1.2% significant
format-xparb: 2.34x as fast 156.6ms +/- 4.6% 66.8ms +/- 4.2% significant
math: ?? 88.1ms +/- 4.4% 91.6ms +/- 1.3% not conclusive: might be *1.040x as slow*
cordic: *1.47x as slow* 19.4ms +/- 10.7% 28.5ms +/- 2.7% significant
partial-sums: 1.27x as fast 51.0ms +/- 5.3% 40.1ms +/- 1.0% significant
spectral-norm: *1.30x as slow* 17.7ms +/- 6.0% 23.0ms +/- 2.1% significant
regexp: 1.34x as fast 50.2ms +/- 8.4% 37.5ms +/- 7.6% significant
dna: 1.34x as fast 50.2ms +/- 8.4% 37.5ms +/- 7.6% significant
string: 1.46x as fast 415.7ms +/- 12.6% 284.6ms +/- 1.9% significant
base64: 1.44x as fast 30.2ms +/- 6.4% 21.0ms +/- 6.2% significant
fasta: 1.25x as fast 60.7ms +/- 5.1% 48.5ms +/- 2.6% significant
tagcloud: 1.31x as fast 114.1ms +/- 9.5% 87.2ms +/- 1.4% significant
unpack-code: 1.60x as fast 137.3ms +/- 22.0% 85.6ms +/- 2.5% significant
validate-input: 1.74x as fast 73.4ms +/- 20.7% 42.3ms +/- 6.5% significant
いろんなサイトで見るデータってのは、Core 2 DuoとかCore i7で走らせたものだから、互角 (新しいV8を採用してるChromeだからV8の方が速いかも?)なんだけど、Chrome OSがターゲットにしてるであろうIntel Atomプロセッサだと、V8って遅いんだよね。実際の理由は調べてないけど、CPUキャッシュの量が少ないからとかなのかもしれない。