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Date:      Fri, 19 Feb 1999 12:42:06 +1300
From:      Andrew McNaughton <andrew@squiz.co.nz>
To:        freebsd-isp@FreeBSD.ORG
Subject:   file locking
Message-ID:  <199902182342.XAA22473@aniwa.sky>

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I'm doing some tuning of a perl script which serves up web banners.  Disk IO 
is the critical resource, and the way the script is structured means that 
multiple instances wind up waiting on each other's file locks.

Can anyone tell me what level of disk overhead is caused by checking 
repeatedly for  the presence of an flock, or a file.  Is this significant, or 
does it just get negated by cache?  Is there an advantage to flock over lock 
files or vice versa?

Andrew McNaughton



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