On Thu, Aug 06, 2015 at 10:27:28AM +1000, Dave Chinner wrote: > From: Dave Chinner <dchinner@xxxxxxxxxx> > > Now that generic/038 is running on my test machine, I notice how > slow it is: > > generic/038 692s > > 11-12 minutes for a single test is way too long. > The test is creating > 400,000 single block files, which can be easily parallelised and > hence run much faster than the test is currently doing. > > Split the file creation up into 4 threads that create 100,000 files > each. 4 is chosen because XFS defaults to 4AGs, ext4 still has decent > speedups at 4 concurrent creates, and other filesystems aren't hurt > by excessive concurrency. The result: > > generic/038 237s > > on the same machine, which is roughly 3x faster and so it (just) > fast enough to to be considered acceptible. I got a speedup from 5663s to 639s, and confirmed the test could fail the test on unpatched btrfs (btrfsck failed, not every time). Reviewed-by: Eryu Guan <eguan@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe fstests" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
