NEW 18264
Adding 2,000,000 spans containing different fonts is slow 
https://bugs.webkit.org/show_bug.cgi?id=18264
Summary Adding 2,000,000 spans containing different fonts is slow
Eric Seidel (no email)
Reported 2008-04-01 16:57:20 PDT
Crash in array instance I ran into this while trying to make Safari run out of GDI objects. :) See test case. Process: Safari [18170] Path: /Applications/Safari.app/Contents/MacOS/Safari Identifier: com.apple.Safari Version: 3.1 (5525.13) Build Info: WebBrowser-55251300~1 Code Type: X86 (Native) Parent Process: launchd [341] Date/Time: 2008-04-01 16:54:35.691 -0700 OS Version: Mac OS X 10.5.2 (9C31) Report Version: 6 Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000bf7ffffc Crashed Thread: 0 Thread 0 Crashed: 0 com.apple.JavaScriptCore 0x00340cb2 KJS::ArrayInstance::mark() + 114 1 com.apple.JavaScriptCore 0x0033fd6d KJS::PropertyMap::mark() const + 221 2 com.apple.JavaScriptCore 0x0033fd6d KJS::PropertyMap::mark() const + 221 3 com.apple.JavaScriptCore 0x0033fd6d KJS::PropertyMap::mark() const + 221 4 com.apple.JavaScriptCore 0x0033fd6d KJS::PropertyMap::mark() const + 221 5 com.apple.JavaScriptCore 0x0033fd6d KJS::PropertyMap::mark() const + 221 6 com.apple.JavaScriptCore 0x0033fd6d KJS::PropertyMap::mark() const + 221 . . .
Attachments
test case (crashes Safari) (1.15 KB, text/html)
2008-04-01 16:57 PDT, Eric Seidel (no email) 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Eric Seidel (no email)
Comment 1 2008-04-01 16:57:59 PDT
Created attachment 20277 [details] test case (crashes Safari)
Gavin Barraclough
Comment 2 2011-08-08 16:53:30 PDT
I don't think this is a JSC bug any more - I don't see a crash in ToT. Looks like this test takes an unreasonably long time to run, so might still be worth looking at the performance at some point.
Alexey Proskuryakov
Comment 3 2011-08-09 10:50:29 PDT
Is that worth tracking as a bug? Two million spans is a large amount.
Gavin Barraclough
Comment 4 2011-08-09 11:54:39 PDT
Hey Alexey, Sam suggested that this test may be exposing some n^2 behaviour in adding sibling spans, so could be worth profiling. It may be worth nothing that this also thrashes on font rendering, since the contents of no two spans are the same. I'll bow out of the conversation to leave the decision to someone more expert in the field - if you don't think this is a useful test then please do close. G.
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