linux-kernel - Re: [Announce] Development release 0.1 of the LatencyTOP tool

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Message-Id: <1200682931.7735.18.camel@localhost>
Date:	Fri, 18 Jan 2008 12:02:11 -0700
From:	Zan Lynx <zlynx@....org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Announce] Development release 0.1 of the LatencyTOP tool


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.
> 
> http://www.latencytop.org
> 
> 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 causing
> 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?
-- 
Zan Lynx <zlynx@....org>

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