4026 2005-07-16 04:51:53 -0700 Math.random() not seeded 2005-12-29 03:07:48 -0800 1 1 1 Unclassified WebKit JavaScriptCore 412 Mac OS X 10.4 RESOLVED FIXED P2 Normal --- 1 snu ggaren oldest_to_newest 14735 0 snu 2005-07-16 04:51:53 -0700 Math.random() appears to be unseeded, and uses the rand() function which is known to perform poorly on OS X (IIRC, anyway). A partial workaround is to srand(time(NULL)) from the host application. 14738 1 snu 2005-07-16 04:53:38 -0700 *** Bug 4027 has been marked as a duplicate of this bug. *** 26696 2 5294 ggaren 2005-12-26 20:23:27 -0800 Created attachment 5294 Fix FYI, rand() is the *faster* of the random number generators on OS X. (random() makes the cryptography gods happier, but I don't think we need to worry about anyone using JavaScript for that...) 26710 3 5294 mjs 2005-12-27 01:35:27 -0800 Comment on attachment 5294 Fix Is the :: business really needed here? Also, mightn't you want a time value that has more than second precision? But otherwise, r=me looks like a good improvement. 26740 4 5294 darin 2005-12-27 10:29:51 -0800 Comment on attachment 5294 Fix Is it really a good thing for JavaScript to change the global seed used by the process it's hosted in? Also, why not use sranddev() instead of srand(time(0))? And why not switch to random(), at least on OS X? If we used that, we could use initstate() and setstate() and make the random number sequence for JavaScriptCore be entirely separate from the random number sequence used by other callers inside the process. 26761 5 5304 ggaren 2005-12-27 11:45:01 -0800 Created attachment 5304 Fix 2 Attempt to address some of the comments above. 26762 6 5304 ggaren 2005-12-27 11:45:49 -0800 Comment on attachment 5304 Fix 2 patch to get rid of ::, use sranddev(), but not use random(). 26763 7 ggaren 2005-12-27 11:53:15 -0800 In addition to non-portability, I didn't want to use random() because it's advertised as being slower than rand(), and random number generation is a part of the ibench test suite. One option to avoid trampling the parent process would be to test for rand() == 16807, which is the first value returned by an unseeded rand(). I doubt that's portable, though. 26819 8 mjs 2005-12-27 14:26:29 -0800 Trampling the parent process is unfortunate but seems unavoidable without a portable, efficient API to do it otherwise. 26823 9 5304 mjs 2005-12-27 14:31:36 -0800 Comment on attachment 5304 Fix 2 Actually, now that I look more closely - shouldn't randomSeeded be a static variable, rather than a field of MathFunctionImp? As it is, every interpreter will reseed the RNG on the first call to Math.random, that doesn't seem to be what we want. 26920 10 5325 ggaren 2005-12-27 22:30:47 -0800 Created attachment 5325 Fix 3 Use a static class boolean to track seeding the RNG. I think globals get initialized to 0 by default, so the initializer may be overkill. Can't hurt, I suppose. 27036 11 jhaygood 2005-12-28 10:37:00 -0800 For Windows, we can use rand_s(), which uses the system generated seed. This will let the 2 OSes have the best OS specific optimizations available. rand_s is the new Whidbey CRT (the C Runtime Environment used by Visual Studio 2005) that uses Windows XP's (and Windows Vista's) cryptographically secure APIs for generating random numbers and uses CryptoAPI on older platforms, automagically. Would this be a suitable #ifdef? 27040 12 5325 darin 2005-12-28 10:42:01 -0800 Comment on attachment 5325 Fix 3 The page load test intentionally seeds the random number generator the same way every time to give repeatable results. This patch is going to break that feature. 27077 13 5325 mjs 2005-12-28 16:36:22 -0800 Comment on attachment 5325 Fix 3 r=me, to address Darin's concern, the PLT could do what it does after ensuring that at least one random number has been generated, since this latest patch promises one time only seeding. Class scope statics do need to be initialized, but you could make it file scope, then there is no need to mention it in the header. It is better to leave implementation details out of headers when possible IMO. 27115 14 ggaren 2005-12-29 03:07:48 -0800 Landed. 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