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tests/test-persistent-nodemap.t
author Pierre-Yves David <pierre-yves.david@octobus.net>
Tue, 11 Feb 2020 11:18:52 +0100
changeset 44363 f7459da77f23
parent 44336 8374b69aef75
child 44445 336ec75ed1ac
permissions -rw-r--r--
nodemap: introduce an option to use mmap to read the nodemap mapping The performance and memory benefit is much greater if we don't have to copy all the data in memory for each information. So we introduce an option (on by default) to read the data using mmap. This changeset is the last one definition the API for index support nodemap data. (they have to be able to use the mmaping). Below are some benchmark comparing the best we currently have in 5.3 with the final step of this series (using the persistent nodemap implementation in Rust). The benchmark run `hg perfindex` with various revset and the following variants: Before: * do not use the persistent nodemap * use the CPython implementation of the index for nodemap * use mmapping of the changelog index After: * use the MixedIndex Rust code, with the NodeTree object for nodemap access (still in review) * use the persistent nodemap data from disk * access the persistent nodemap data through mmap * use mmapping of the changelog index The persistent nodemap greatly speed up most operation on very large repositories. Some of the previously very fast lookup end up a bit slower because the persistent nodemap has to be setup. However the absolute slowdown is very small and won't matters in the big picture. Here are some numbers (in seconds) for the reference copy of mozilla-try: Revset Before After abs-change speedup -10000: 0.004622 0.005532 0.000910 × 0.83 -10: 0.000050 0.000132 0.000082 × 0.37 tip 0.000052 0.000085 0.000033 × 0.61 0 + (-10000:) 0.028222 0.005337 -0.022885 × 5.29 0 0.023521 0.000084 -0.023437 × 280.01 (-10000:) + 0 0.235539 0.005308 -0.230231 × 44.37 (-10:) + :9 0.232883 0.000180 -0.232703 ×1293.79 (-10000:) + (:99) 0.238735 0.005358 -0.233377 × 44.55 :99 + (-10000:) 0.317942 0.005593 -0.312349 × 56.84 :9 + (-10:) 0.313372 0.000179 -0.313193 ×1750.68 :9 0.316450 0.000143 -0.316307 ×2212.93 On smaller repositories, the cost of nodemap related operation is not as big, so the win is much more modest. Yet it helps shaving a handful of millisecond here and there. Here are some numbers (in seconds) for the reference copy of mercurial: Revset Before After abs-change speedup -10: 0.000065 0.000097 0.000032 × 0.67 tip 0.000063 0.000078 0.000015 × 0.80 0 0.000561 0.000079 -0.000482 × 7.10 -10000: 0.004609 0.003648 -0.000961 × 1.26 0 + (-10000:) 0.005023 0.003715 -0.001307 × 1.35 (-10:) + :9 0.002187 0.000108 -0.002079 ×20.25 (-10000:) + 0 0.006252 0.003716 -0.002536 × 1.68 (-10000:) + (:99) 0.006367 0.003707 -0.002660 × 1.71 :9 + (-10:) 0.003846 0.000110 -0.003736 ×34.96 :9 0.003854 0.000099 -0.003755 ×38.92 :99 + (-10000:) 0.007644 0.003778 -0.003866 × 2.02 Differential Revision: https://phab.mercurial-scm.org/D7894
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Test the persistent on-disk nodemap
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  $ hg init test-repo












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  $ cd test-repo







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  $ cat << EOF >> .hg/hgrc












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  > [experimental]












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  > exp-persistent-nodemap=yes







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  > [devel]












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  > persistent-nodemap=yes







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  > EOF







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  $ hg debugbuilddag .+5000







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  $ hg debugnodemap --metadata












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  uid: ???????????????? (glob)







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  tip-rev: 5000







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  data-length: 122880












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  data-unused: 0







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  $ f --size .hg/store/00changelog.n







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  .hg/store/00changelog.n: size=42







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  $ f --sha256 .hg/store/00changelog-*.nd












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  .hg/store/00changelog-????????????????.nd: sha256=b961925120e1c9bc345c199b2cc442abc477029fdece37ef9d99cbe59c0558b7 (glob)







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  $ hg debugnodemap --dump-new | f --sha256 --size







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  size=122880, sha256=b961925120e1c9bc345c199b2cc442abc477029fdece37ef9d99cbe59c0558b7







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  $ hg debugnodemap --dump-disk | f --sha256 --bytes=256 --hexdump --size







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  0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  0010: ff ff ff ff ff ff ff ff ff ff fa c2 ff ff ff ff |................|












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  0020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  0030: ff ff ff ff ff ff ed b3 ff ff ff ff ff ff ff ff |................|












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  0040: ff ff ff ff ff ff ee 34 00 00 00 00 ff ff ff ff |.......4........|












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  0050: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  0060: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  0070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  0080: ff ff ff ff ff ff f8 50 ff ff ff ff ff ff ff ff |.......P........|












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  0090: ff ff ff ff ff ff ff ff ff ff ec c7 ff ff ff ff |................|












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  00a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  00b0: ff ff ff ff ff ff fa be ff ff f2 fc ff ff ff ff |................|












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  00c0: ff ff ff ff ff ff ef ea ff ff ff ff ff ff f9 17 |................|












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  00d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  00e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|












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  00f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|







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  $ hg debugnodemap --check












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  revision in index:   5001












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  revision in nodemap: 5001







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add a new commit












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  $ hg up












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  0 files updated, 0 files merged, 0 files removed, 0 files unresolved












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  $ echo foo > foo












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  $ hg add foo












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  $ hg ci -m 'foo'







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#if pure







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  $ hg debugnodemap --metadata












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  uid: ???????????????? (glob)







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  tip-rev: 5001







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  data-length: 123072












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  data-unused: 192












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#else












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  $ hg debugnodemap --metadata












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  uid: ???????????????? (glob)












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  tip-rev: 5001












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  data-length: 122880












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  data-unused: 0












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#endif







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  $ f --size .hg/store/00changelog.n







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  .hg/store/00changelog.n: size=42







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(The pure code use the debug code that perform incremental update, the C code reencode from scratch)












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#if pure












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  $ f --sha256 .hg/store/00changelog-*.nd --size












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  .hg/store/00changelog-????????????????.nd: size=123072, sha256=136472751566c8198ff09e306a7d2f9bd18bd32298d614752b73da4d6df23340 (glob)












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#else







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  $ f --sha256 .hg/store/00changelog-*.nd --size












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  .hg/store/00changelog-????????????????.nd: size=122880, sha256=bfafebd751c4f6d116a76a37a1dee2a251747affe7efbcc4f4842ccc746d4db9 (glob)







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#endif












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  $ hg debugnodemap --check












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  revision in index:   5002












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Test code path without mmap












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---------------------------












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  $ echo bar > bar












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  $ hg add bar












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  $ hg ci -m 'bar' --config experimental.exp-persistent-nodemap.mmap=no












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  $ hg debugnodemap --check --config experimental.exp-persistent-nodemap.mmap=yes












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  revision in index:   5003












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  $ hg debugnodemap --check --config experimental.exp-persistent-nodemap.mmap=no












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  revision in index:   5003












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#if pure












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  $ hg debugnodemap --metadata












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  uid: ???????????????? (glob)












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  tip-rev: 5002












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  data-length: 123328












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  data-unused: 384












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  $ f --sha256 .hg/store/00changelog-*.nd --size












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  .hg/store/00changelog-????????????????.nd: size=123328, sha256=10d26e9776b6596af0f89143a54eba8cc581e929c38242a02a7b0760698c6c70 (glob)












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#else












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  $ hg debugnodemap --metadata












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  uid: ???????????????? (glob)












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  tip-rev: 5002












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  data-length: 122944












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  data-unused: 0












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  $ f --sha256 .hg/store/00changelog-*.nd --size












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  .hg/store/00changelog-????????????????.nd: size=122944, sha256=755976b22b64ab680401b45395953504e64e7fa8c31ac570f58dee21e15f9bc0 (glob)












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   120


#endif














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