Sun, 17 Jan 2016 19:33:02 +0100 graft: clarify in help that `-r` is not just optional
Mads Kiilerich <madski@unity3d.com> [Sun, 17 Jan 2016 19:33:02 +0100] rev 27898
graft: clarify in help that `-r` is not just optional Positional parameters are also treated as revisions, but the order of revisions matters and it will often be wrong if the user understands it as `-r` taking multiple revisions as `-r REV1 REV2`. (Alternatively, `-r` could be turned into a no-op flag as the documentation suggests. That would however be less "semantic markup" and I agree with the implementation in 55e7f352b1d3 but not the documentation.)
Thu, 14 Jan 2016 13:44:01 -0800 streamclone: use backgroundfilecloser (issue4889)
Gregory Szorc <gregory.szorc@gmail.com> [Thu, 14 Jan 2016 13:44:01 -0800] rev 27897
streamclone: use backgroundfilecloser (issue4889) Closing files that have been appended to is slow on Windows/NTFS. CloseHandle() calls on this platform often take 1-10ms - and that's on my i7-6700K Skylake processor with a modern and fast SSD. Contrast with other I/O operations, such as writing data, which take <100us. This means that creating/appending thousands of files can add significant overhead. For example, cloning mozilla-central creates ~232,000 revlog files. Assuming 1ms per CloseHandle(), that yields 232s (3:52) of wall time waiting for file closes! The impact of this overhead can be measured most directly when applying stream clone bundles. Applying these files is effectively uncompressing a tar archive (read: it's very fast). Using a RAM disk (read: no I/O wait), the difference in wall time for a `hg debugapplystreamclonebundle` for a ~1731 MB mozilla-central bundle between Windows and Linux from the same machine is drastic: Linux: ~12.8s (128MB/s) Windows: ~352.0s (4.7MB/s) Windows is ~27.5x slower. Yikes! After this patch: Linux: ~12.8s (128MB/s) Windows: ~102.1s (16.1MB/s) Windows is now ~3.4x faster. Unfortunately, it is still ~8x slower than Linux. Profiling reveals a few hot code paths that could likely be improved. But those are for other patches. This patch introduces test-clone-uncompressed.t because existing tests of `clone --uncompressed` are scattered about and adding a variation for background thread closing to e.g. test-http.t doesn't feel correct.
Sat, 02 Jan 2016 16:11:36 -0800 streamclone: indent code
Gregory Szorc <gregory.szorc@gmail.com> [Sat, 02 Jan 2016 16:11:36 -0800] rev 27896
streamclone: indent code This will make the subsequent patch easier to read.
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