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copied!<p>You can see that Java apps based on JGit have a tendency to disble ddd by default.<br> See this <a href="http://gitblit.com/properties.html" rel="nofollow">config file</a> for <a href="http://gitblit.com/" rel="nofollow"><strong>Gitblit</strong></a> for instance:</p> <pre><code># When true, JGit will use mmap() rather than malloc()+read() to load data from # pack files. The use of mmap can be problematic on some JVMs as the garbage # collector must deduce that a memory mapped segment is no longer in use before # a call to munmap() can be made by the JVM native code. # # In server applications (such as Gitblit) that need to access many pack files, # setting this to true risks artificially running out of virtual address space, # as the garbage collector cannot reclaim unused mapped spaces fast enough. # # Default on JGit is false. Although potentially slower, it yields much more # predictable behavior. # Documentation courtesy of the Gerrit project. # # SINCE 1.0.0 # RESTART REQUIRED git.packedGitMmap = false </code></pre> <hr> <p>This is consistent with the <a href="http://dev.eclipse.org/mhonarc/lists/jgit-dev/msg01961.html" rel="nofollow">JGit thread</a> you found:</p> <blockquote> <blockquote> <p>I ran into another instance of not being able to delete a cloned repository in windows.<br> This one appears linked to the use of "<code>PackedGitMMAP</code>".<br> Is this a known problem with trying to use virtual memory mapping?</p> </blockquote> <p>Yes.<br> The problem is the JVM does not release the memory mapping until the mapping is garbage collected by the Java GC.<br> This can happen at any time in the future, possibly never if there is insufficient memory pressure to force the GC to really look for garbage and reclaim.<br> This is why we disable the feature by default, we can't predict when the JVM will finally release the file.</p> <blockquote> <p>In this test case if I "<code>setPackedGitMMAP=false</code>" then the repository is deleted successfully.</p> </blockquote> <p>Yes. This is why this is the default.</p> </blockquote>

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