llvm dev - Aug 2018 - llvm-exegesis

Hi everyone,

Can someone help me with running llvm-exegesis tool on x86_64? I saw that I need
libpfm library, but I'm still getting segmentation fault when I try to run
the tool. Is there anything else I need to do (build llvm on some specific way)
?
This is how I tried to run this tool: llvm-exegesis -mode=latency
-opcode-name=ADD64rr

Thanks,
Luka
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Hi Luka,

Which CPU and OS are you running? Most linux distros seem to have an old 
version of libpfm - I've had more luck (better CPU support) by using the 
trunk version from 
https://sourceforge.net/p/perfmon2/libpfm4/ci/master/tree/

Also, are running the tool with sudo?

Simon.

On 14/08/2018 16:28, Luka Ercegovcevic via llvm-dev
wrote:
> Hi everyone,
>
> Can someone help me with running llvm-exegesis tool on x86_64? I saw 
> that I need libpfm library, but I'm still getting segmentation fault 
> when I try to run the tool. Is there anything else I need to do (build 
> llvm on some specific way) ?
> This is how I tried to run this tool: llvm-exegesis -mode=latency 
> -opcode-name=ADD64rr
>
> Thanks,
> Luka
>
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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Hi Simon,

I updated my OS to Ubuntu 18.04.1, and now it works fine. I'm not sure what
was the issue on Ubuntu 16.04.10

Thanks,
Luka

-------- Original Message --------
Subject: Re: [llvm-dev] llvm-exegesis
Date: Tuesday, August 14, 2018 21:19 CEST
From: Simon Pilgrim <llvm-dev at redking.me.uk>
To: llvm-dev at lists.llvm.org
CC: Luka Ercegovcevic <Luka.Ercegovcevic at rt-rk.com>, Petar Jovanovic
<Petar.Jovanovic at rt-rk.com>
References: <3315-5b72f500-3-172feea0 at 222762487>


  
Hi Luka,
Which CPU and OS are you running? Most linux distros seem to have an old version
of libpfm - I've had more luck (better CPU support) by using the trunk
version from https://sourceforge.net/p/perfmon2/libpfm4/ci/master/tree/
Also, are running the tool with sudo?Simon.
 On 14/08/2018 16:28, Luka Ercegovcevic via llvm-dev wrote:Hi everyone,

Can someone help me with running llvm-exegesis tool on x86_64? I saw that I need
libpfm library, but I'm still getting segmentation fault when I try to run
the tool. Is there anything else I need to do (build llvm on some specific way)
?
This is how I tried to run this tool: llvm-exegesis -mode=latency
-opcode-name=ADD64rr

Thanks,
Luka  _______________________________________________
LLVM Developers mailing list
llvm-dev at lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

 
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Hi Luka, some distributions require you to allow perf event access (see
https://reviews.llvm.org/D47572), have you done that ?

On Tue, Aug 14, 2018 at 5:28 PM, Luka Ercegovcevic <
Luka.Ercegovcevic at rt-rk.com> wrote:
> Hi everyone,
>
> Can someone help me with running llvm-exegesis tool on x86_64? I saw that
> I need libpfm library, but I'm still getting segmentation fault when I
try
> to run the tool. Is there anything else I need to do (build llvm on some
> specific way) ?
> This is how I tried to run this tool: llvm-exegesis -mode=latency
> -opcode-name=ADD64rr
>
> Thanks,
> Luka
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Hi Clement,

I updated my OS from Ubuntu 16.04.10 to Ubuntu 18.04.1, and now it works fine.

-------- Original Message --------
Subject: Re: llvm-exegesis
Date: Wednesday, August 29, 2018 21:24 CEST
From: Clement Courbet <courbet at google.com>
To: Luka Ercegovcevic <Luka.Ercegovcevic at rt-rk.com>
CC: llvm-dev <llvm-dev at lists.llvm.org>, Petar Jovanovic
<Petar.Jovanovic at rt-rk.com>, clément courbet <clement.courbet at
gmail.com>
References: <3315-5b72f500-3-172feea0 at 222762487>


 Hi Luka, some distributions require you to allow perf event access
(see https://reviews.llvm.org/D47572), have you done that ? On Tue, Aug 14, 2018
at 5:28 PM, Luka Ercegovcevic <Luka.Ercegovcevic at rt-rk.com> wrote:Hi
everyone,

Can someone help me with running llvm-exegesis tool on x86_64? I saw that I need
libpfm library, but I'm still getting segmentation fault when I try to run
the tool. Is there anything else I need to do (build llvm on some specific way)
?
This is how I tried to run this tool: llvm-exegesis -mode=latency
-opcode-name=ADD64rr

Thanks,
Luka
 
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