20718 2008-09-08 04:05:34 -0700 Cache the code generated for eval to speed up SunSpider and web sites 2008-09-08 09:46:00 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 528+ (Nightly build) Mac OS X 10.5 RESOLVED FIXED P2 Normal --- 1 mjs mjs eric oliver zwarich oldest_to_newest 90497 0 mjs 2008-09-08 04:05:34 -0700 The date-format-tofte test could benefit from an eval code cache, whereby code for the same string eval'd in the same context is retained so that repeated evals can skip parsing and compilation. Bleeding-edge V8 includes a similar idea. It turns out that real sites benefit from this as well. Google spreadsheets, GMail, Slate and Digg all get hits on this cache, between 2 and 100 depending on the site. I also tested that in the miss case there is no measurable slowdown. 90499 1 23247 mjs 2008-09-08 04:17:10 -0700 Created attachment 23247 add an eval code cache 90500 2 mjs 2008-09-08 04:19:13 -0700 The attached patch is a 1.052x speedup on SunSpider relative to trunk. 90501 3 23247 andersca 2008-09-08 04:28:57 -0700 Comment on attachment 23247 add an eval code cache >\ No newline at end of file Should add a newline here. r=me 90548 4 ggaren 2008-09-08 09:46:00 -0700 Why not make the cache per global object? That would save memory in the case of a lot of functions doing similar evals. 23247 2008-09-08 04:17:10 -0700 2008-09-08 04:28:57 -0700 add an eval code cache eval-code-cache.patch.txt text/plain 10445 mjs SW5kZXg6IEphdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBKYXZhU2NyaXB0 Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDM2MjY1KQorKysgSmF2YVNjcmlwdENvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMjUgQEAKKzIwMDgtMDktMDggIE1hY2llaiBT dGFjaG93aWFrICA8bWpzQGFwcGxlLmNvbT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg KE9PUFMhKS4KKyAgICAgICAgCisgICAgICAgIC0gQ2FjaGUgdGhlIGNvZGUgZ2VuZXJhdGVkIGZv ciBldmFsIHRvIHNwZWVkIHVwIFN1blNwaWRlciBhbmQgd2ViIHNpdGVzCisgICAgICAgIGh0dHBz Oi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMDcxOAorICAgICAgICAKKyAgICAg ICAgMS4wNTJ4IG9uIFN1blNwaWRlcgorICAgICAgICAyLjI5eCBvbiBkYXRlLWZvcm1hdC10b2Z0 ZQorICAgICAgICAKKyAgICAgICAgTG90cyBvZiByZWFsIHNpdGVzIHNlZW0gdG8gZ2V0IG1hbnkg 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