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Re: CVS Performance
Re: CVS Performance
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
> 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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