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copied!<p>If the slowdown is seen when running multiple simultaneous Git commands, it could be due to a kernel locking issue within msysgit</p> <p>We saw that under some conditions, multiple instances of git.exe would all wait on the same kernel object (inside <code>WaitForSingleObject()</code>), effectively meaning that only a single git command could be run on the system at a time.</p> <p>See here:<img src="https://i.stack.imgur.com/GeqEI.png" alt="10 git.exe processes all waiting on a single kernel object"></p> <p>Using ProcessExplorer, we could see all the git.exe processes were stuck here:</p> <pre><code>ntoskrnl.exe!KeWaitForMultipleObjects+0xc0a ntoskrnl.exe!KeAcquireSpinLockAtDpcLevel+0x732 ntoskrnl.exe!KeWaitForMutexObject+0x19f ntoskrnl.exe!FsRtlCancellableWaitForMultipleObjects+0x5e ntoskrnl.exe!FsRtlCancellableWaitForSingleObject+0x27 </code></pre> <p>This seems to be related to this issue: <a href="http://code.google.com/p/msysgit/issues/detail?id=320" rel="nofollow noreferrer">http://code.google.com/p/msysgit/issues/detail?id=320</a> in that it's not Git but the pseudo-Linux runtime (mingw) which appears to contain the problem.</p> <p>We changed the user account used to run the applications from SYSTEM to an interactive user account, and the kernel object waits went away:</p> <p>Healthy git.exe processes <img src="https://i.stack.imgur.com/oMxP1.png" alt="git.exe processes spawning happily"></p> <p>Therefore, the slowdown you are seeing COULD be related to some kind of kernel object contention - only when the previous git command has released the kernel lock might other commands be able to run.</p> <p>Try changing the user account under which you are running the git commands, and see if this solves the issue - it did for us.</p>

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