linux-kernel - Re: [PATCH] perf/test: Speed up test case perf annotate basic tests

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Message-ID: <59c2cbb8-b24d-429f-b4fc-6a2560ce4e09@linaro.org>
Date: Tue, 17 Sep 2024 13:52:21 +0100
From: James Clark <james.clark@...aro.org>
To: Thomas Richter <tmricht@...ux.ibm.com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, acme@...nel.org, namhyung@...nel.org
Cc: agordeev@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
 hca@...ux.ibm.com
Subject: Re: [PATCH] perf/test: Speed up test case perf annotate basic tests



On 17/09/2024 09:57, Thomas Richter wrote:
> perf test 70 takes a long time. One culprit is the output of command
> perf annotate. Per default enabled are
>   - demangle symbol names
>   - interleave source code with assembly code.
> Disable demangle of symbols and abort the annotation
> after the first 250 lines.
> 
> This speeds up the test case considerable, for example
> on s390:
> 
> Output before:
>   # time  perf test 70
>   70: perf annotate basic tests             : Ok
>   .....
>   real   2m7.467s
>   user   1m26.869s
>   sys    0m34.086s
>   #
> 
>   Output after:
>   # time perf test 70
>   70: perf annotate basic tests             : Ok
> 
>   real   0m3.341s
>   user   0m1.606s
>   sys    0m0.362s
>   #
> 

Interesting that there is such a big difference, I only measured 4s vs 
14s without the patch.

Either way it's slightly faster now:

Reviewed-by: James Clark <james.clark@...aro.org>