[llvm-dev] Hitting kMaxNumChunks

[Aleksey Shlyapnikov via llvm-dev]

I'm afraid, increasing the size of the chunks array for all platforms might
not go that well with iOS and Android (look for ASAN_LOW_MEMORY for the
reference). I'll think of the best way to handle it. Thank you, Frederik!

On Fri, Feb 9, 2018 at 10:29 AM, Frederik Deweerdt <
frederik.deweerdt at gmail.com> wrote:

> Hello,
>
> On Wed, Jan 24, 2018 at 4:22 PM, Kostya Serebryany <kcc at google.com> wrote:
> >
> >
> > On Wed, Jan 24, 2018 at 12:10 PM, Frederik Deweerdt
> > <frederik.deweerdt at gmail.com> wrote:
> [...]
> >>
> >> > If yes, yea, I guess we need to bump kMaxNumChunks
> >> >
> >> >
> >> I'll increase the limit to 2^19 for our build, and I'll report the
> results
> >> here.
> >
> >
> I ended up increasing the limit to 2^20, because the max allocation
> for large objects is around 100G on those hosts. With that done, i hit
> an issue where adding stacks to the StackDepot became a visible
> bottleneck after a few hours. To solve that, i've set
> `malloc_context_size=0`, because we're not tracking leaks, and in our
> experience getting the call site of the ASAN report carries enough
> information to diagnose the issue. With these two changes, the build
> is behaving as expected.
> If you think it's worth doing, i'm happy to post a patch for the
> constant increase.
>
> Thanks,
> Frederik
>
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