Displaying 2 results from an estimated 2 matches for "f340951e".
2014 Apr 17
2
[LLVMdev] multithreaded performance disaster with -fprofile-instr-generate (contention on profile counters)
...ry.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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2014 Apr 17
2
[LLVMdev] multithreaded performance disaster with -fprofile-instr-generate (contention on profile counters)
On Thu, Apr 17, 2014 at 6:10 PM, Yaron Keren <yaron.keren at gmail.com> wrote:
> If accuracy is not critical, incrementing the counters without any guards
> might be good enough.
>
No. Contention on the counters leads to 5x-10x slowdown. This is never
good enough.
--kcc
Hot areas will still be hot and cold areas will not be affected.
>
> Yaron
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