On Oct 7, 2006, at 21:52, Troy Curtis Jr wrote:
> On 10/6/06, Ryan Schmidt wrote:
>
>> On Oct 6, 2006, at 14:34, Ruslan Sivak wrote:
>>
>> > Also windows starts being very slow when you have a lot of entries
>> > in a directory. I think you are hitting that problem. Perhaps in
>> > the future SVN can be designed to keep a nested directory
>> > structure, keeping no more then X revisions in a folder. Basically
>> > something like this
>> >
>> > revs
>> > 1/
>> > 1
>> > 2
>> > 3
>> > ...
>> > 99
>> > 100
>> > 2/ 101
>> > 102
>> >
>> > etc. I'm sure there's a better way to implement this though, but I
>> > think this is definitely needed for large number of revisions on
>> > windows.
>>
>> I thought I remembered someone months ago explaining that there is no
>> performance issue, even on Windows. Something about how the only time
>> you have this problem is when you need to get a directory listing,
>> which Subversion does not need to do, because it already knows what
>> the files are named, along with something about how the file system
>> hashes based on the first 8 characters of the filename, so there's no
>> issue until revision 100000000 which could take awhile to reach.
>> Perhaps someone else will remember the discussion and can dig up the
>> old message. I don't remember the specifics very well; I didn't pay
>> too much attention because I do not use Windows, and I believe the
>> issue was said to be nonexistent on other platforms.
>
> I disagree based on personal experience, on a NON-windows platform.
> All those revs files just seemed to slow things down. Well, I say
> that, but most of gain using bdb was that it had a full-copy of the
> latest revision. FSFS had to run through some number of diffs to
> contruct my checkout copy and that was probably what was slowing me
> down. However, it is true when doing a hotcopy of the repository
> (fsfs hotcopy: ~33minutes bdb hotcopy: ~6 minutes). Of course this is
> a largely OS file copy action.
That may be, I just don't think that dividing the FSFS revisions
amongst multiple directories as the OP suggests will alleviate any of
the performance issues you mention. I don't think it's a problem of
having all the revision files in a single directory.
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@subversion.tigris.org
For additional commands, e-mail: users-help@subversion.tigris.org
Received on Sun Oct 8 05:02:41 2006