http://subversion.tigris.org/issues/show_bug.cgi?id=4207
                 Issue #|4207
                 Summary|Speed up tmpfile creation
               Component|subversion
                 Version|trunk
                Platform|All
                     URL|
              OS/Version|All
                  Status|NEW
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|ENHANCEMENT
                Priority|P3
            Subcomponent|libsvn_subr
             Assigned to|issues@subversion
             Reported by|dkobras






------- Additional comments from dkobras@tigr... Thu Jul 19 08:58:07 -0700 2012 -------
(I've tried to send this patch to dev@, and user@ several weeks ago. None of
them seem to have made it to the lists. My best guess is they've ended up in
some moderator's /dev/null.)

Analyzing performance problems during the svn checkout of a project containing
several large directories--one with more than 1500 entries--, we've discovered
that libsvn_subr/io.c::svn_io_open_uniquely_named() is the culprit: When
creating temporary files in the prop-base subdirectory, the current
implementation leads to a high number of open() calls, proportional to the
square of the number of entries per directory. Most of these open() calls fail
with EEXIST.

Using a different scheme that essentially remembers (part of) the
last created temporary filename, most of these unsuccessful calls can be
avoided. (For the project in question, this reduced the total amount of
syscalls per checkout by almost 50 per cent, and significantly improved
checkout speed, especially on NFS filesystems where open() is relatively
expensive.)

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