63918 2011-07-04 13:50:24 -0700 [JSC] WebKit allocates gigabytes of memory when doing repeated string concatenation 2011-07-19 12:49:26 -0700 1 1 1 Unclassified WebKit WebCore JavaScript 528+ (Nightly build) Mac (Intel) OS X 10.6 RESOLVED FIXED http://files.myopera.com/emoller/blog/webkit.html InRadar P2 Normal --- 1 zr40.nl mhahnenberg barraclough dbates dominicc eric ggaren mhahnenberg mrowe oliver sam tonikitoo webkit.review.bot oldest_to_newest 432047 0 zr40.nl 2011-07-04 13:50:24 -0700 On http://files.myopera.com/emoller/blog/webkit.html, WebKit allocates several gigabytes of memory, while other browsers do not. This happens in the current WebKit nightly (r90370) as well as Safari 5.0.5 (6533.21.1), but not in Firefox 5.0 and Chrome 12.0.742.112. 432088 1 dominicc 2011-07-04 19:25:52 -0700 I debugged this a little, and I observed the JSC GC is allocating JSStrings with two fibers during string concatenation. These JSC heap objects are small, so JSC GC is not triggered. However there is a lot of string copying in the C++ heap, which is where I think the heap growth comes from. OP: If you need a workaround, which is probably fragile, you can trick JSC into creating strings with three pieces, which have a different code path, by doing something like changing: for (var i = offs; i < offs + 10; ++i) dest += dest[i]; to this: for (var i = offs; i < offs + 10; i += 2) dest = dest + dest[i] + dest[i + 1]; 432400 2 barraclough 2011-07-05 14:18:52 -0700 (In reply to comment #1) > I debugged this a little, and I observed the JSC GC is allocating JSStrings with two fibers during string concatenation. These JSC heap objects are small, so JSC GC is not triggered. There is a mechanism that is meant to help deal with this, that looks a little broken. One of the JSString constructors is calling reportExtraMemoryCost - this should probably be called on all UStrings & StringImpls being passed through the JSString constructors. (That said, Geoff has been doing a lot of work in the heap lately, might be worth verifying this mechanism is still live & hooked up on the other side). 438827 3 ggaren 2011-07-18 16:51:51 -0700 Yes, reportExtraMemoryCost is the way to fix this. 438831 4 ggaren 2011-07-18 16:52:38 -0700 <rdar://problem/9796985> 439225 5 101339 mhahnenberg 2011-07-19 10:09:49 -0700 Created attachment 101339 Patch 439237 6 101339 darin 2011-07-19 10:31:47 -0700 Comment on attachment 101339 Patch Is there a good way for us to test this? 439302 7 ggaren 2011-07-19 11:41:10 -0700 I'd recommend testing this patch with SunSpider and posting the results here. String concatenation can be a hot operation. 439303 8 ggaren 2011-07-19 11:41:50 -0700 (But I can't think of a good way to unit test this, since the only symptom is memory footprint, and our unit testing framework doesn't have a mechanism for measuring that.) 439332 9 101356 mhahnenberg 2011-07-19 12:03:11 -0700 Created attachment 101356 SunSpider results 439333 10 oliver 2011-07-19 12:03:53 -0700 We actually need results of sunspider-compare-results 439343 11 101359 mhahnenberg 2011-07-19 12:14:07 -0700 Created attachment 101359 SunSpider results comparison 439375 12 101339 webkit.review.bot 2011-07-19 12:49:20 -0700 Comment on attachment 101339 Patch Clearing flags on attachment: 101339 Committed r91288: <http://trac.webkit.org/changeset/91288> 439376 13 webkit.review.bot 2011-07-19 12:49:26 -0700 All reviewed patches have been landed. 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