[llvm-dev] ?==?utf-8?q? [llvm-exegesis] Uops mode isnćt working

Milos Stojanovic via llvm-dev llvm-dev at lists.llvm.org
Wed Dec 18 09:07:02 PST 2019

Thank you everyone. I found it and submitted the patch: https://reviews.llvm.org/D71665.


-------- Original Message --------
Subject: Re: [llvm-dev] [llvm-exegesis] Uops mode isnćt working
Date: Tuesday, December 17, 2019 15:58 CET
From: Clement Courbet <courbet at google.com>
To: Roman Lebedev <lebedev.ri at gmail.com>
CC: Milos Stojanovic <Milos.Stojanovic at rt-rk.com>, llvm-dev <llvm-dev at lists.llvm.org>, Guillaume Chatelet <gchatelet at google.com>
References: <5322-5df8e880-15-4d5b5380 at 33486712> 

 Thanks Roman,

To elaborate a bit, you can tell which host CPU llvm detected by looking at the `cpu_name` field in llvm-exegesis output for latency, something like:
cpu_name:        haswell And check that this one has a PfmCountersBinding in X86PfmCounter.td, and that it's correct.  On Tue, Dec 17, 2019 at 3:42 PM Roman Lebedev <lebedev.ri at gmail.com> wrote:That means the pfm counters are not specified correctly for that CPU.
You'll need to patch X86PfmCounter.td
Please do submit that patch to https://reviews.llvm.org/ afterwards!


On Tue, Dec 17, 2019 at 5:39 PM Milos Stojanovic via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Hello,
> I've been testing llvm-exegesis on X86. Latency and inverse_throughput modes work fine but when I run uops I get an error:
> event not found - cannot create event uops_dispatched_port:port_0
> LLVM ERROR: invalid perf event 'uops_dispatched_port:port_0'
> I'm running this on a i7-4790K. Am I missing something on my computer or is this not yet fully implemented?
> This also affects the llvm-exegesis lit tests and they all get skipped becuse the configuration script determines that uops doens't work. This could be changed so that the tests still run the modes that work (latency and inverse_throughput in my case).
> Regards
> Miloš _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev+4rg@mail.gmail.com>
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