[merge] Tweaks for AtomicFile and LocalTransport.append()
mbp at canonical.com
Thu Aug 10 03:54:42 BST 2006
On 9 Aug 2006, John Arbash Meinel <john at arbash-meinel.com> wrote:
> The attached patches tweak AtomicFile and LocalTransport.append and
> mkdir so that hopefully they will ultimately do fewer chmod() calls. In
> general, it streamlines a few code paths. The final performance
> difference can be seen with 'make_kernel_like_tree'.
> On my machine 'make_kernel_like_tree' takes:
> bzr.dev: 7.8 - 8.2
> with tweaks and put: 4.5 - 7.5
> switching to append: 2.9 - 4.5
> I'm not really interested in the make_kernel_like_tree improvements,
> since my benchmark caching will handle that even better. However, it
> does show a general improvement in LocalTransport.put() and append()
> speeds, which I am very interested in.
> Robert started this work. I just cleaned it up, added direct tests for
> AtomicFile, and made sure that file modes still worked correctly even
> when umask is involved.
This reminds me we should finish off and merge the refinements to
TestSkipped that Aaron was working on.
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