Unable to find Jank - Chromium OS dev

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Message from discussion Unable to find Jank
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From: Don Garrett <dgarr...@chromium.org>
Date: Wed, 28 Mar 2012 17:24:21 -0700
Message-ID: <CA+8=yo+HDiqad8xE+aU4figtPq+_3MCZj=xD1ukwOFzBUOD...@mail.gmail.com>
Subject: Re: [cros-dev] Unable to find Jank
To: Mandeep Singh Baines <m...@chromium.org>
Cc: Chromium OS dev <chromium-os-...@chromium.org>
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Just to point out to everyone. We haven't been able to reproduce this when
we're watching, but there have been a lot of reports from canary channel
and such. The bug is chromium-os:27597.

On Wed, Mar 28, 2012 at 17:06, Mandeep Singh Baines <m...@chromium.org>wrote:

> Don Garrett (dgarr...@chromium.org) wrote:
> > Jay and I (well, mostly Jay) been trying to reproduce/measure UI
> > performance jank when update_engine runs in background. So far, we
> haven't
> > been able to do it. Is there anyone that would like to help out?
> >
>
> Is there a bug number?
>
> > If it helps our best guess candidate for a problem cause is that ionice
> > isn't being very effective. Our second best guess is the additional
> memory
> > pressure, though what we use (other than io buffers) is mostly measured
> in
> > low 10's of megs.
> >
>
> I find mpstat and vmstat to be great tools for detecting jank I've heard
> that latency_top is also a good tool though I haven't used it much.
>
> Regards,
> Mandeep
>
> > --
> > Don
> >
> > --
> > Chromium OS Developers mailing list: chromium-os-...@chromium.org
> > View archives, change email options, or unsubscribe:
> > http://groups.google.com/a/chromium.org/group/chromium-os-dev?hl=en
>



-- 
Don

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Just to point out to everyone. We haven&#39;t been able to reproduce this when we&#39;re watching, but there have been a lot of reports from canary channel and such. The bug is chromium-os:27597.<br><br><div class="gmail_quote">

On Wed, Mar 28, 2012 at 17:06, Mandeep Singh Baines <span dir="ltr">&lt;<a href="mailto:m...@chromium.org">m...@chromium.org</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div class="im">Don Garrett (<a href="mailto:dgarr...@chromium.org">dgarr...@chromium.org</a>) wrote:<br>
&gt; Jay and I (well, mostly Jay) been trying to reproduce/measure UI<br>
&gt; performance jank when update_engine runs in background. So far, we haven&#39;t<br>
&gt; been able to do it. Is there anyone that would like to help out?<br>
&gt;<br>
<br>
</div>Is there a bug number?<br>
<div class="im"><br>
&gt; If it helps our best guess candidate for a problem cause is that ionice<br>
&gt; isn&#39;t being very effective. Our second best guess is the additional memory<br>
&gt; pressure, though what we use (other than io buffers) is mostly measured in<br>
&gt; low 10&#39;s of megs.<br>
&gt;<br>
<br>
</div>I find mpstat and vmstat to be great tools for detecting jank I&#39;ve heard<br>
that latency_top is also a good tool though I haven&#39;t used it much.<br>
<br>
Regards,<br>
Mandeep<br>
<div class="HOEnZb"><div class="h5"><br>
&gt; --<br>
&gt; Don<br>
&gt;<br>
&gt; --<br>
&gt; Chromium OS Developers mailing list: <a href="mailto:chromium-os-...@chromium.org">chromium-os-...@chromium.org</a><br>
&gt; View archives, change email options, or unsubscribe:<br>
&gt; <a href="http://groups.google.com/a/chromium.org/group/chromium-os-dev?hl=en" target="_blank">http://groups.google.com/a/chromium.org/group/chromium-os-dev?hl=en</a><br>
</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br>Don<br>

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