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Re: CVS Performance

From: Michael Peck
Subject: Re: CVS Performance
Date: Fri, 05 Jan 2001 08:19:42 -0800

I also discovered that as the history file (CVSROOT/history) grows, it
really becomes a HUGE bottleneck.

If you delete/rename the file, cvs will stop appending to it.


Eric Siegerman wrote:

> On Thu, Jan 04, 2001 at 04:51:23PM -0600, Cheryl Tipple wrote:
> > It appears we have a performance problem within our CVS system.
> > [CPU, network bandwidth, filesystem access path, RAM, swap are
> > all far from saturated]
> >
> > Can anyone tell me if there are any
> > [...] tests I can run to trace this problem?  We are also
> > going to try a network sniffer from our end to identify where the data
> > is moving.
> How about physical disk I/O?  You don't say which operations are
> causing you trouble, but update and commit both do a lot more
> disk I/O than one would naively expect -- they do locking by
> creating temporary directories (because mkdir() is atomic, I
> presume):
>   1. create a lock directory in each repository directory to be
>      operated on, recursively all the way down
>   2. do the operation
>   3. delete all the lock directories
> Note that:
>   - This is three recursive passes over the affected subtree, NOT
>     a single pass in which all three operations are done on each
>     directory as it is visited
>   - The per-directory progress messages are all printed during
>     step 2; steps 1 and 3 are silent.
> To find out how much of the slowness is network-related, remove
> the network from the equation: try doing the same operations
> locally (ie. non-client/server) on the server machine.  To do
> this, set CVSROOT (or the value of the prefix -d option) to the
> unadorned absolute pathname of the repository, ie. with no access
> method specified.  (Even if you don't want to give accounts to
> the developers, the admin can do a checkout or two for testing --
> or even commits, on a scratch copy of the repository.)
> Good luck.
> --
> |  | /\
> |-_|/  >   Eric Siegerman, Toronto, Ont.        address@hidden
> |  |  /
> Interviewer: You've been looking at the stars all your life:
> Is there anything in astrology?
> Arthur C. Clarke: It's utter nonsense.  But I'm a Sagittarius,
> so I'm naturally skeptical.
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