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From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Reply-To: vda@port.imtp.ilyichevsk.odessa.ua
To: William Lee Irwin III <wli@holomorphy.com>,
       David Lang <david.lang@digitalinsight.com>
Subject: Re: [Lse-tech] Re: 15000+ processes -- poor performance ?!
Date: Thu, 19 Dec 2002 13:05:03 -0200
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Cc: Robert Love <rml@tech9.net>, Till Immanuel Patzschke <tip@inw.de>,
       lse-tech <lse-tech@lists.sourceforge.net>, linux-kernel@vger.kernel.org
References: <1040262178.855.106.camel@phantasy> <Pine.LNX.4.44.0212181743350.7848-100000@dlang.diginsite.com> <20021219020552.GO31800@holomorphy.com>
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On 19 December 2002 00:05, William Lee Irwin III wrote:
> On Wed, Dec 18, 2002 at 05:44:46PM -0800, David Lang wrote:
> > In my case I will still be running thousands of processes, so I
> > have to just teach everyone not to use top instead.
> > David Lang
>
> Well, a better solution would be a userspace free of /proc/
> dependency.
>
> Or actually fixing the kernel. proc_pid_readdir() wants an
> efficiently indexable linear list, e.g. TAOCP's 6.2.3 "Linear List
> Representation". At that point its expense is proportional to the
> buffer size and "seeking" about the list as it is wont to do is
> O(lg(processes)).

A short-time solution: run top d 30 to make it refresh only every 30 seconds.
This will greatly reduce top's own load skew.
--
vda
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