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List:       subversion-issues
Subject:    [Issue 773] New - PROPFIND on large dir takes excessive memory/time
From:       issues () subversion ! tigris ! org
Date:       2002-06-30 12:35:02
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http://subversion.tigris.org/issues/show_bug.cgi?id=773

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+ +============================================================================+
+ | PROPFIND on large dir takes excessive memory/time                          |
+ +----------------------------------------------------------------------------+
+ |      Issue #: 773                       Component: subversion              |
+ |       Status: NEW                         Version: current                 |
+ |   Resolution:                            Platform: All                     |
+ |   Issue type: DEFECT                   OS/Version: All                     |
+ |     Priority: P3                     Subcomponent: src                     |
+ +----------------------------------------------------------------------------+
+ |  Assigned To: issues@subversion                                            |
+ |  Reported By: kevin                                                        |
+ |      CC list: Cc:                                                          |
+ +----------------------------------------------------------------------------+
+ |    Milestone: TargetMilestone: ---                                         |
+ |          URL:                                                              |
+ +============================================================================+
+ |                              DESCRIPTION                                   |
+ Quoting from my mail to the dev list:
+ 
+ > Trying to help someone on IRC today, I imported the linux kernel source into a
+ > repository.  I then tried to check it out over dav and had problems.  After
+ > watching for a while, I noticed that whenever the checkout started a new
+ > directory it would stop for quite a while, and the httpd memory usage would
+ > grow.  I soon found out that my svn client would time out before getting a
+ > PROPFIND request back for the include/linux directory of the kernel sources.
+ > 
+ > The reason for this is that my machine starts thrashing, because the httpd
+ > process trying to do the propfind grows huge (680MB before I killed it).(Note
+ > by contrast that opening the directory in w3m took about 2 seconds, and I
+ > didn't notice httpd's memory usage.
+ > 
+ > Tracing into this I found that mod_dav opens and closes it's internal prop
+ > database for every resource found.  I don't claim to know enough about the
+ > internal workings of mod_dav to fix it, but thought I would post it here to
+ > get gstein's attention when he gets back.
+ 
+ Also note that it is not the call to svn_fs_dir_entries that is the problem
+ since dav_svn_deliver has the same call, but not the same problems.  Sander
+ thinks it may be the recursive loop just below (we're talking
+ mod_dav_svn/repos.c:1963).  He's testing a fix right now, so hopefully this
+ issue will be quickly closed.
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