[LLVMdev] multithreaded performance disaster with -fprofile-instr-generate (contention on profile counters)

[Kostya Serebryany]

On Thu, Apr 17, 2014 at 8:37 PM, Jonathan Roelofs <jonathan at codesourcery.com
> wrote:

> How about per-thread if the counter is hot enough?
>

Err. How do you know if the counter is hot w/o first profiling the app?
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