linux-kernel - Re: [Bug 120481] Performance drop 30-40% for SPECjbb2005 and SPECjvm2008 benchmarks

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Message-ID: <CALT_uBQwc_TQTGjmDwm=4PS0DDv9JP3x0bc1T0UXBk6151zXuQ@mail.gmail.com>
Date:	Wed, 22 Jun 2016 10:34:50 +0200
From:	Jiri Hladky <hladky.jiri@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	bugzilla-daemon@...zilla.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Bug 120481] Performance drop 30-40% for SPECjbb2005 and
 SPECjvm2008 benchmarks

Hi Peter,

I use this Java package.

java-1.7.0-openjdk

I think you don't thing you need to install Windows Manager. In fact,
I'm using just plain text log file (${VER}/${DATE}.log) produced with
this command

./run-specjvm.sh --benchmarkThreads 32 --iterations 1 --iterationTime
180 --warmuptime 90 xml.transform xml.validation 2>&1 | tee >
${VER}/${DATE}.log

Please let me finish bisecting. There are last two commits to be checked:

$ git log --pretty=oneline
e7904a28f5331c21d17af638cb477c83662e3cb6..6ecdd74962f246dfe8750b7bea481a1c0816315d
6ecdd74962f246dfe8750b7bea481a1c0816315d sched/fair: Generalize the
load/util averages resolution definition
2159197d66770ec01f75c93fb11dc66df81fd45b sched/core: Enable increased
load resolution on 64-bit kernels

I should be able to identify the commit which has caused this
regression in few hours.

Jirka

On Wed, Jun 22, 2016 at 10:17 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Jun 22, 2016 at 08:09:13AM +0000, bugzilla-daemon@...zilla.kernel.org wrote:
>> https://bugzilla.kernel.org/show_bug.cgi?id=120481
>>
>> --- Comment #9 from Jirka Hladky <hladky.jiri@...il.com> ---
>> Created attachment 220921
>>   --> https://bugzilla.kernel.org/attachment.cgi?id=220921&action=edit
>> Script to quickly reproduce the results
>>
>> 1) Obtain SPECjvm2008 here:
>> https://www.spec.org/download.html
>>
>> 2) Install Java 1.7
>
> I don't have this, its not in Debian repositories. All I have is various
> versions of openjdk or gcj.
>
>> 3) Install Window Manager  - Benchmark is creating graphs and it needs WM for
>> this step
>
> This machine doesn't even have a monitor or keyboard attached, wtf would
> I install desktop stuff on it, that's fail.
>
>> I will upload list of rpm files I have installed on test machine in the next
>> attachment.
>
> Useless, I'm on Debian.
>
>> 4) Copy the script from this attachment to directory where you have installed
>> the benchmark. There should be script run-specjvm.sh
>
> Please just use email; bugzilla is crap.