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On Wednesday, August 25, 2010 at 11:37:15 AM UTC-7 Vitali wrote: > I'd recommend opening a bug in v8's issue tracker so they're aware of this > upstream. > > On Wed, Aug 25, 2010 at 4:35 AM, Bert Belder <[email protected]> wrote: > >> Thanks for looking into it, I'll try the patch in a minute. >> >> In the short term it should help me because I do not need a lot more >> memory than 1GB. The biggest problem was the slowness due to V8 doing >> full GCs like crazy when it's almost out of memory, so this should >> help a little. >> >> However, do you think this could/will be fixed in the long term? >> Eventually I'd like to be able to use 16G of memory :-) >> >> - Bert >> >> >> On Aug 25, 1:06 pm, Vyacheslav Egorov <[email protected]> wrote: >> > Hi Bert, >> > >> > I did a quick look into this problem. It seems V8 currently can't handle >> > such big heaps: >> > >> > 0) Memory allocator and MarkCompact garbage collector encode certain >> things >> > in a special way so without major rewriting you can try to get at most >> > ~1.8gb heap on x64. >> > >> > 1) Memory management code is full of integer overflows --- it uses int >> where >> > bigger type is required to handle big heap sizes. [I am attaching small >> > dirty patch to fix some of this overflows. with it you can grow heap >> almost >> > up to 1.8 gb heap] >> > >> > 2) GC pauses will be huge for huge heaps: mark-sweep will take at > 1 s, >> > mark-compact will take > 3s, scavenge throughput will also be degraded >> (it >> > needs to scan oldspaces for intergenerational pointers). >> > >> > -- >> > Vyacheslav Egorov >> > >> > On Wed, Aug 25, 2010 at 10:36 AM, Bert Belder <[email protected]> >> wrote: >> > > On Aug 25, 9:57 am, Erik Corry <[email protected]> wrote: >> > > > Are you running the 64 bit version of V8? >> > >> > > I think so. To eliminate other causes I did a fresh git clone from >> > > git://github.com/v8/v8.git, then: >> > > scons arch=x64 sample=shell >> > > ./shell --max_old_space_size=2000000000 test.js >> > >> > > > file `which v8` >> > > ./shell: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), >> > > dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not >> > > stripped >> > >> > > - Bert >> > >> > > -- >> > > v8-users mailing list >> > > [email protected] >> > >http://groups.google.com/group/v8-users >> > >> > >> > >> > overflows.patch >> > 9KViewDownload >> >> -- >> v8-users mailing list >> [email protected] >> http://groups.google.com/group/v8-users >> > > -- -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/v8-users/b0a5e4eb-917e-45f0-886d-ea249ccc338cn%40googlegroups.com.
