Subject: Re: [Announce] Development release 0.1 of the LatencyTOP tool
From: Zan Lynx <zlynx@acm.org>
To: Arjan van de Ven <arjan@linux.intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Ingo Molnar <mingo@elte.hu>, Andrew Morton <akpm@linux-foundation.org>
In-Reply-To: <4790E3A6.7060807@linux.intel.com>
References: <4790E3A6.7060807@linux.intel.com>
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Date: Fri, 18 Jan 2008 12:02:11 -0700
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On Fri, 2008-01-18 at 09:36 -0800, Arjan van de Ven wrote:
> The Intel Open Source Technology Center is pleased to announce the
> release of version 0.1 of LatencyTOP, a tool for developers to visualize
> system latencies.
>=20
> http://www.latencytop.org
>=20
> Slow servers, Skipping audio, Jerky video --everyone knows the symptoms
> of latency. But to know what's really going on in the system, what's caus=
ing
> the latency, and how to fix it... those are difficult questions without
> good answers right now.
[cut]

Just curious...

My biggest latency problems (as observed by me, the user) happen when a
program needs memory, or launching a new program, and the kernel begins
forces dirty memory to disk.  This results in an unholy seek storm of
mixed writes (flushing, maybe a little swap) and reads (new program
loading).  Streaming audio/video almost always starts freezing up during
this as well.

I don't suppose LatencyTop would help track anything down in that case,
would it?
--=20
Zan Lynx <zlynx@acm.org>

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