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Re: cvs tag performance

From: Rahul
Subject: Re: cvs tag performance
Date: 14 Jul 2005 13:16:39 -0700
User-agent: G2/0.2

run "iostat -x 3" or equivalent to monitor the disk for contention.
Look for stats like (see man iostat). On Linux :

         The average queue length of the requests that were issue
         to the device.

          The average  time  (in  milliseconds)  for  I/O  requests
          issued to the device to be served. This includes the time
          spent by the requests in queue and the time spent servic-
          ing them.

           The  average  service  time  (in  milliseconds)  for  I/O
           requests that were issued to the device.

If you see large queue sizes and response times you know you may have a
disk storm being generated when tag command modifies files. Since CVS
doesn't do any concurrent tagging (like mutliple threads or processes
operating on individual dirs etc) you will have to look at faster disk

When you say "it's suddenly taking too much time" there must be other
disk activity kicking in that's causing disk contention when tag
command shows up.


Rahul Bhargava
CTO, WANdisco

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