Re: How to speed up subversion

On May 24, 2010, at 2:05 PM, Les Mikesell wrote:

> On 5/24/2010 3:51 PM, David Brodbeck wrote:
>>
>> On May 21, 2010, at 8:23 AM, Hyrum K. Wright wrote:
>>> Actually, Subversion is a bit more intelligent about it, attempting to use modification times and sizes, before doing a byte-by-byte comparison.
>>
>> Even that can be slow if there are lots of files involved. Note that some filesystems have particularly bad performance if there are lots of files in a single directory, as well. This is especially true of NFS. In one extreme example, I've seen a simple "ls" take tens of minutes to produce any output in an NFS-mounted directory with ~1,000,000 files.
>
> But to be fair, note that ls sorts its output, so it can't output anything until it has read everything.

True, but other operations were slow, too. The way readdir() works means that a lot of file operations inevitably involve a linear search of the directory.

-- 
David Brodbeck
System Administrator, Linguistics
University of Washington