SID-00238: Grep slows down server

Status:	Answered	TWiki version:	4.1.2	Perl version:	5.8
Category:	CategoryPerformance	Server OS:	redhat	Last update:	16 years ago

Many grep processes cause poor TWiki performance.

At any given time the server process table may show many grep commands. These could be egrep or fgrep etc.

I found out that views of WebRss topics create many grep processes and these do have an affect on the service.

In order to diagnose other sources could someone post the reasons for when grep is used . I assume that the following is used to check backlinks during a rename?

bin/egrep -i -l -H -- META.TOPICMOVED.*from

Thanks for any input

-- PeterJones - 01 Apr 2009

Discussion and Answer

Odd, WebRss should not span grep. A lot of optimization can be done in TWiki. Some of the speed optimization has been inadvertently removed in the large scale TWiki 4 code refactoring work.

In any case, consider caching of RSS pages, see HowToCacheRssFeedsWithRewriteRule

-- PeterThoeny - 2009-06-02

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