Mercurial > hg
view tests/test-remotefilelog-repack.t @ 42044:bb271ec2fbfb
compression: introduce a `storage.revlog.zstd.level` configuration
This option control the zstd compression level used when compressing revlog
chunk. The usage of zstd for revlog compression has not graduated from
experimental yet, but we intend to fix that soon.
The option name for the compression level is more straight forward to pick, so
this changesets comes first. Having a dedicated option for each compression
engine is useful because they don't support the same range of values.
I ran the same measurement as for the zlib compression level (in the parent
changesets). The variation in repository size is stay mostly in the same (small)
range. The "read/write" performance see smallish variation, but are overall much
better than zlib. Write performance show the same tend of having better write
performance for when reaching high-end compression.
Again, we don't intend to change the default zstd compression level (currently:
3) in this series. However this is worth investigating in the future.
The Performance comparison of zlib vs zstd is quite impressive. The repository
size stay in the same range, but the performance are much better in all
situations.
Comparison summary
==================
We are looking at:
- performance range for zlib
- performance range for zstd
- comparison of default zstd (level-3) to default zlib (level 6)
- comparison of the slowest zstd time to the fastest zlib time
Read performance:
-----------------
| zlib | zstd | cmp | f2s
mercurial | 0.170159 - 0.189219 | 0.144127 - 0.149624 | 80% | 88%
pypy | 2.679217 - 2.768691 | 1.532317 - 1.705044 | 60% | 63%
netbeans | 122.477027 - 141.620281 | 72.996346 - 89.731560 | 58% | 73%
mozilla | 147.867662 - 170.572118 | 91.700995 - 105.853099 | 56% | 71%
Write performance:
------------------
| zlib | zstd | cmp | f2s
mercurial | 53.250304 - 56.2936129 | 40.877025 - 45.677286 | 75% | 86%
pypy | 460.721984 - 476.589918 | 270.545409 - 301.002219 | 63% | 65%
netbeans | 520.560316 - 715.930400 | 370.356311 - 428.329652 | 55% | 82%
mozilla | 739.803002 - 987.056093 | 505.152906 - 591.930683 | 57% | 80%
Raw data
--------
repo alg lvl .hg/store size 00manifest.d read write
mercurial zlib 1 49,402,813 5,963,475 0.170159 53.250304
mercurial zlib 6 47,197,397 5,875,730 0.182820 56.264320
mercurial zlib 9 47,121,596 5,849,781 0.189219 56.293612
mercurial zstd 1 49,737,084 5,966,355 0.144127 40.877025
mercurial zstd 3 48,961,867 5,895,208 0.146376 42.268142
mercurial zstd 5 48,200,592 5,938,676 0.149624 43.162875
mercurial zstd 10 47,833,520 5,913,353 0.145185 44.012489
mercurial zstd 15 47,314,604 5,728,679 0.147686 45.677286
mercurial zstd 20 47,330,502 5,830,539 0.145789 45.025407
mercurial zstd 22 47,330,076 5,830,539 0.143996 44.690460
pypy zlib 1 370,830,572 28,462,425 2.679217 460.721984
pypy zlib 6 340,112,317 27,648,747 2.768691 467.537158
pypy zlib 9 338,360,736 27,639,003 2.763495 476.589918
pypy zstd 1 362,377,479 27,916,214 1.532317 270.545409
pypy zstd 3 354,137,693 27,905,988 1.686718 294.951509
pypy zstd 5 342,640,043 27,655,774 1.705044 301.002219
pypy zstd 10 334,224,327 27,164,493 1.567287 285.186239
pypy zstd 15 329,000,363 26,645,965 1.637729 299.561332
pypy zstd 20 324,534,039 26,199,547 1.526813 302.149827
pypy zstd 22 324,530,595 26,198,932 1.525718 307.821218
netbeans zlib 1 1,281,847,810 165,495,457 122.477027 520.560316
netbeans zlib 6 1,205,284,353 159,161,207 139.876147 715.930400
netbeans zlib 9 1,197,135,671 155,034,586 141.620281 678.297064
netbeans zstd 1 1,259,581,737 160,840,613 72.996346 370.356311
netbeans zstd 3 1,232,978,122 157,691,551 81.622317 396.733087
netbeans zstd 5 1,208,034,075 160,246,880 83.080549 364.342626
netbeans zstd 10 1,188,624,176 156,083,417 79.323935 403.594602
netbeans zstd 15 1,176,973,589 153,859,477 89.731560 428.329652
netbeans zstd 20 1,162,958,258 151,147,535 82.842667 392.335349
netbeans zstd 22 1,162,707,029 151,150,220 82.565695 402.840655
mozilla zlib 1 2,775,497,186 298,527,987 147.867662 751.263721
mozilla zlib 6 2,596,856,420 286,597,671 170.572118 987.056093
mozilla zlib 9 2,587,542,494 287,018,264 163.622338 739.803002
mozilla zstd 1 2,723,159,348 286,617,532 91.700995 570.042751
mozilla zstd 3 2,665,055,001 286,152,013 95.240155 561.412805
mozilla zstd 5 2,607,819,817 288,060,030 101.978048 505.152906
mozilla zstd 10 2,558,761,085 283,967,648 104.113481 497.771202
mozilla zstd 15 2,526,216,060 275,581,300 105.853099 591.930683
mozilla zstd 20 2,485,114,806 266,478,859 95.268795 576.515389
mozilla zstd 22 2,484,869,080 266,456,505 94.429282 572.785537
| author | Pierre-Yves David <pierre-yves.david@octobus.net> |
|---|---|
| date | Wed, 27 Mar 2019 18:35:59 +0100 |
| parents | 0800d9e6e216 |
| children | 2c74337e6483 |
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#require no-windows $ . "$TESTDIR/remotefilelog-library.sh" $ hg init master $ cd master $ cat >> .hg/hgrc <<EOF > [remotefilelog] > server=True > serverexpiration=-1 > EOF $ echo x > x $ hg commit -qAm x $ echo x >> x $ hg commit -qAm x2 $ cd .. $ hgcloneshallow ssh://user@dummy/master shallow -q 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob) # Set the prefetchdays config to zero so that all commits are prefetched # no matter what their creation date is. $ cd shallow $ cat >> .hg/hgrc <<EOF > [remotefilelog] > prefetchdays=0 > EOF $ cd .. # Test that repack cleans up the old files and creates new packs $ cd shallow $ find $CACHEDIR | sort $TESTTMP/hgcache $TESTTMP/hgcache/master $TESTTMP/hgcache/master/11 $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072 $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/aee31534993a501858fb6dd96a065671922e7d51 $TESTTMP/hgcache/repos $ hg repack $ find $CACHEDIR | sort $TESTTMP/hgcache $TESTTMP/hgcache/master $TESTTMP/hgcache/master/packs $TESTTMP/hgcache/master/packs/1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histidx $TESTTMP/hgcache/master/packs/1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histpack $TESTTMP/hgcache/master/packs/b1e0cfc7f345e408a7825e3081501959488d59ce.dataidx $TESTTMP/hgcache/master/packs/b1e0cfc7f345e408a7825e3081501959488d59ce.datapack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos # Test that the packs are readonly $ ls_l $CACHEDIR/master/packs -r--r--r-- 1145 1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histidx -r--r--r-- 172 1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histpack -r--r--r-- 1074 b1e0cfc7f345e408a7825e3081501959488d59ce.dataidx -r--r--r-- 72 b1e0cfc7f345e408a7825e3081501959488d59ce.datapack -rw-r--r-- 0 repacklock # Test that the data in the new packs is accessible $ hg cat -r . x x x # Test that adding new data and repacking it results in the loose data and the # old packs being combined. $ cd ../master $ echo x >> x $ hg commit -m x3 $ cd ../shallow $ hg pull -q $ hg up -q tip 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ find $CACHEDIR -type f | sort $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/d4a3ed9310e5bd9887e3bf779da5077efab28216 $TESTTMP/hgcache/master/packs/1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histidx $TESTTMP/hgcache/master/packs/1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histpack $TESTTMP/hgcache/master/packs/b1e0cfc7f345e408a7825e3081501959488d59ce.dataidx $TESTTMP/hgcache/master/packs/b1e0cfc7f345e408a7825e3081501959488d59ce.datapack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos # First assert that with --packsonly, the loose object will be ignored: $ hg repack --packsonly $ find $CACHEDIR -type f | sort $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/d4a3ed9310e5bd9887e3bf779da5077efab28216 $TESTTMP/hgcache/master/packs/1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histidx $TESTTMP/hgcache/master/packs/1e91b207daf5d7b48f1be9c587d6b5ae654ce78c.histpack $TESTTMP/hgcache/master/packs/b1e0cfc7f345e408a7825e3081501959488d59ce.dataidx $TESTTMP/hgcache/master/packs/b1e0cfc7f345e408a7825e3081501959488d59ce.datapack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos $ hg repack --traceback $ find $CACHEDIR -type f | sort $TESTTMP/hgcache/master/packs/78840d69389c7404327f7477e3931c89945c37d1.dataidx $TESTTMP/hgcache/master/packs/78840d69389c7404327f7477e3931c89945c37d1.datapack $TESTTMP/hgcache/master/packs/8abe7889aae389337d12ebe6085d4ee13854c7c9.histidx $TESTTMP/hgcache/master/packs/8abe7889aae389337d12ebe6085d4ee13854c7c9.histpack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos # Verify all the file data is still available $ hg cat -r . x x x x $ hg cat -r '.^' x x x # Test that repacking again without new data does not delete the pack files # and did not change the pack names $ hg repack $ find $CACHEDIR -type f | sort $TESTTMP/hgcache/master/packs/78840d69389c7404327f7477e3931c89945c37d1.dataidx $TESTTMP/hgcache/master/packs/78840d69389c7404327f7477e3931c89945c37d1.datapack $TESTTMP/hgcache/master/packs/8abe7889aae389337d12ebe6085d4ee13854c7c9.histidx $TESTTMP/hgcache/master/packs/8abe7889aae389337d12ebe6085d4ee13854c7c9.histpack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos # Run two repacks at once $ hg repack --config "hooks.prerepack=sleep 3" & $ sleep 1 $ hg repack skipping repack - another repack is already running $ hg debugwaitonrepack >/dev/null 2>&1 # Run repack in the background $ cd ../master $ echo x >> x $ hg commit -m x4 $ cd ../shallow $ hg pull -q $ hg up -q tip 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ find $CACHEDIR -type f | sort $TESTTMP/hgcache/master/11/f6ad8ec52a2984abaafd7c3b516503785c2072/1bb2e6237e035c8f8ef508e281f1ce075bc6db72 $TESTTMP/hgcache/master/packs/78840d69389c7404327f7477e3931c89945c37d1.dataidx $TESTTMP/hgcache/master/packs/78840d69389c7404327f7477e3931c89945c37d1.datapack $TESTTMP/hgcache/master/packs/8abe7889aae389337d12ebe6085d4ee13854c7c9.histidx $TESTTMP/hgcache/master/packs/8abe7889aae389337d12ebe6085d4ee13854c7c9.histpack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos $ hg repack --background (running background repack) $ sleep 0.5 $ hg debugwaitonrepack >/dev/null 2>&1 $ find $CACHEDIR -type f | sort $TESTTMP/hgcache/master/packs/39443fa1064182e93d968b5cba292eb5283260d0.dataidx $TESTTMP/hgcache/master/packs/39443fa1064182e93d968b5cba292eb5283260d0.datapack $TESTTMP/hgcache/master/packs/604552d403a1381749faf656feca0ca265a6d52c.histidx $TESTTMP/hgcache/master/packs/604552d403a1381749faf656feca0ca265a6d52c.histpack $TESTTMP/hgcache/master/packs/repacklock $TESTTMP/hgcache/repos # Test debug commands $ hg debugdatapack $TESTTMP/hgcache/master/packs/*.datapack $TESTTMP/hgcache/master/packs/39443fa1064182e93d968b5cba292eb5283260d0: x: Node Delta Base Delta Length Blob Size 1bb2e6237e03 000000000000 8 8 d4a3ed9310e5 1bb2e6237e03 12 6 aee31534993a d4a3ed9310e5 12 4 Total: 32 18 (77.8% bigger) $ hg debugdatapack --long $TESTTMP/hgcache/master/packs/*.datapack $TESTTMP/hgcache/master/packs/39443fa1064182e93d968b5cba292eb5283260d0: x: Node Delta Base Delta Length Blob Size 1bb2e6237e035c8f8ef508e281f1ce075bc6db72 0000000000000000000000000000000000000000 8 8 d4a3ed9310e5bd9887e3bf779da5077efab28216 1bb2e6237e035c8f8ef508e281f1ce075bc6db72 12 6 aee31534993a501858fb6dd96a065671922e7d51 d4a3ed9310e5bd9887e3bf779da5077efab28216 12 4 Total: 32 18 (77.8% bigger) $ hg debugdatapack $TESTTMP/hgcache/master/packs/*.datapack --node d4a3ed9310e5bd9887e3bf779da5077efab28216 $TESTTMP/hgcache/master/packs/39443fa1064182e93d968b5cba292eb5283260d0: x Node Delta Base Delta SHA1 Delta Length d4a3ed9310e5bd9887e3bf779da5077efab28216 1bb2e6237e035c8f8ef508e281f1ce075bc6db72 77029ab56e83ea2115dd53ff87483682abe5d7ca 12 Node Delta Base Delta SHA1 Delta Length 1bb2e6237e035c8f8ef508e281f1ce075bc6db72 0000000000000000000000000000000000000000 7ca8c71a64f7b56380e77573da2f7a5fdd2ecdb5 8 $ hg debughistorypack $TESTTMP/hgcache/master/packs/*.histidx x Node P1 Node P2 Node Link Node Copy From 1bb2e6237e03 d4a3ed9310e5 000000000000 0b03bbc9e1e7 d4a3ed9310e5 aee31534993a 000000000000 421535db10b6 aee31534993a 1406e7411862 000000000000 a89d614e2364 1406e7411862 000000000000 000000000000 b292c1e3311f # Test copy tracing from a pack $ cd ../master $ hg mv x y $ hg commit -m 'move x to y' $ cd ../shallow $ hg pull -q $ hg up -q tip 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg repack $ hg log -f y -T '{desc}\n' move x to y x4 x3 x2 x # Test copy trace across rename and back $ cp -R $TESTTMP/hgcache/master/packs $TESTTMP/backuppacks $ cd ../master $ hg mv y x $ hg commit -m 'move y back to x' $ hg revert -r 0 x $ mv x y $ hg add y $ echo >> y $ hg revert x $ hg commit -m 'add y back without metadata' $ cd ../shallow $ hg pull -q $ hg up -q tip 2 files fetched over 2 fetches - (2 misses, 0.00% hit ratio) over * (glob) $ hg repack $ ls $TESTTMP/hgcache/master/packs bfd60adb76018bb952e27cd23fc151bf94865d7d.histidx bfd60adb76018bb952e27cd23fc151bf94865d7d.histpack fb3aa57b22789ebcc45706c352e2d6af099c5816.dataidx fb3aa57b22789ebcc45706c352e2d6af099c5816.datapack repacklock $ hg debughistorypack $TESTTMP/hgcache/master/packs/*.histidx x Node P1 Node P2 Node Link Node Copy From cd410a44d584 577959738234 000000000000 609547eda446 y 1bb2e6237e03 d4a3ed9310e5 000000000000 0b03bbc9e1e7 d4a3ed9310e5 aee31534993a 000000000000 421535db10b6 aee31534993a 1406e7411862 000000000000 a89d614e2364 1406e7411862 000000000000 000000000000 b292c1e3311f y Node P1 Node P2 Node Link Node Copy From 577959738234 1bb2e6237e03 000000000000 c7faf2fc439a x 21f46f2721e7 000000000000 000000000000 d6868642b790 $ hg strip -r '.^' 1 files updated, 0 files merged, 1 files removed, 0 files unresolved saved backup bundle to $TESTTMP/shallow/.hg/strip-backup/609547eda446-b26b56a8-backup.hg (glob) $ hg -R ../master strip -r '.^' 1 files updated, 0 files merged, 1 files removed, 0 files unresolved saved backup bundle to $TESTTMP/master/.hg/strip-backup/609547eda446-b26b56a8-backup.hg (glob) $ rm -rf $TESTTMP/hgcache/master/packs $ cp -R $TESTTMP/backuppacks $TESTTMP/hgcache/master/packs # Test repacking datapack without history $ rm -rf $CACHEDIR/master/packs/*hist* $ hg repack $ hg debugdatapack $TESTTMP/hgcache/master/packs/*.datapack $TESTTMP/hgcache/master/packs/922aca43dbbeda4d250565372e8892ec7b08da6a: x: Node Delta Base Delta Length Blob Size 1bb2e6237e03 000000000000 8 8 d4a3ed9310e5 1bb2e6237e03 12 6 aee31534993a d4a3ed9310e5 12 4 Total: 32 18 (77.8% bigger) y: Node Delta Base Delta Length Blob Size 577959738234 000000000000 70 8 Total: 70 8 (775.0% bigger) $ hg cat -r ".^" x x x x x Incremental repack $ rm -rf $CACHEDIR/master/packs/* $ cat >> .hg/hgrc <<EOF > [remotefilelog] > data.generations=60 > 150 > EOF Single pack - repack does nothing $ hg prefetch -r 0 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack [1] $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack [1] $ hg repack --incremental $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack -r--r--r-- 70 052643fdcdebbd42d7c180a651a30d46098e6fe1.datapack $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack -r--r--r-- 90 955a622173324b2d8b53e1147f209f1cf125302e.histpack 3 gen1 packs, 1 gen0 pack - packs 3 gen1 into 1 $ hg prefetch -r 1 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg prefetch -r 2 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg prefetch -r 38 abort: unknown revision '38'! [255] $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack -r--r--r-- 70 052643fdcdebbd42d7c180a651a30d46098e6fe1.datapack $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack -r--r--r-- 90 955a622173324b2d8b53e1147f209f1cf125302e.histpack For the data packs, setting the limit for the repackmaxpacksize to be 64 such that data pack with size 65 is more than the limit. This effectively ensures that no generation has 3 packs and therefore, no packs are chosen for the incremental repacking. As for the history packs, setting repackmaxpacksize to be 0 which should always result in no repacking. $ hg repack --incremental --config remotefilelog.data.repackmaxpacksize=64 \ > --config remotefilelog.history.repackmaxpacksize=0 $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack -r--r--r-- 70 052643fdcdebbd42d7c180a651a30d46098e6fe1.datapack -r--r--r-- 149 78840d69389c7404327f7477e3931c89945c37d1.datapack $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack -r--r--r-- 254 8abe7889aae389337d12ebe6085d4ee13854c7c9.histpack -r--r--r-- 90 955a622173324b2d8b53e1147f209f1cf125302e.histpack Setting limit for the repackmaxpacksize to be the size of the biggest pack file which ensures that it is effectively ignored in the incremental repacking. $ hg repack --incremental --config remotefilelog.data.repackmaxpacksize=65 \ > --config remotefilelog.history.repackmaxpacksize=336 $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack -r--r--r-- 70 052643fdcdebbd42d7c180a651a30d46098e6fe1.datapack -r--r--r-- 149 78840d69389c7404327f7477e3931c89945c37d1.datapack $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack -r--r--r-- 254 8abe7889aae389337d12ebe6085d4ee13854c7c9.histpack -r--r--r-- 90 955a622173324b2d8b53e1147f209f1cf125302e.histpack 1 gen3 pack, 1 gen0 pack - does nothing $ hg repack --incremental $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack -r--r--r-- 70 052643fdcdebbd42d7c180a651a30d46098e6fe1.datapack -r--r--r-- 149 78840d69389c7404327f7477e3931c89945c37d1.datapack $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack -r--r--r-- 254 8abe7889aae389337d12ebe6085d4ee13854c7c9.histpack -r--r--r-- 90 955a622173324b2d8b53e1147f209f1cf125302e.histpack Pull should run background repack $ cat >> .hg/hgrc <<EOF > [remotefilelog] > backgroundrepack=True > EOF $ clearcache $ hg prefetch -r 0 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg prefetch -r 1 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg prefetch -r 2 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg prefetch -r 3 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ hg pull pulling from ssh://user@dummy/master searching for changes no changes found (running background incremental repack) $ sleep 0.5 $ hg debugwaitonrepack >/dev/null 2>&1 $ ls_l $TESTTMP/hgcache/master/packs/ | grep datapack -r--r--r-- 303 156a6c1c83aeb69422d7936e0a46ba9bc06a71c0.datapack $ ls_l $TESTTMP/hgcache/master/packs/ | grep histpack -r--r--r-- 336 604552d403a1381749faf656feca0ca265a6d52c.histpack Test environment variable resolution $ CACHEPATH=$TESTTMP/envcache hg prefetch --config 'remotefilelog.cachepath=$CACHEPATH' 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ find $TESTTMP/envcache | sort $TESTTMP/envcache $TESTTMP/envcache/master $TESTTMP/envcache/master/95 $TESTTMP/envcache/master/95/cb0bfd2977c761298d9624e4b4d4c72a39974a $TESTTMP/envcache/master/95/cb0bfd2977c761298d9624e4b4d4c72a39974a/577959738234a1eb241ed3ed4b22a575833f56e0 $TESTTMP/envcache/repos Test local remotefilelog blob is correct when based on a pack $ hg prefetch -r . 1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over * (glob) $ echo >> y $ hg commit -m y2 $ hg debugremotefilelog .hg/store/data/95cb0bfd2977c761298d9624e4b4d4c72a39974a/b70860edba4f8242a1d52f2a94679dd23cb76808 size: 9 bytes path: .hg/store/data/95cb0bfd2977c761298d9624e4b4d4c72a39974a/b70860edba4f8242a1d52f2a94679dd23cb76808 key: b70860edba4f node => p1 p2 linknode copyfrom b70860edba4f => 577959738234 000000000000 08d3fbc98c48 577959738234 => 1bb2e6237e03 000000000000 c7faf2fc439a x 1bb2e6237e03 => d4a3ed9310e5 000000000000 0b03bbc9e1e7 d4a3ed9310e5 => aee31534993a 000000000000 421535db10b6 aee31534993a => 1406e7411862 000000000000 a89d614e2364 1406e7411862 => 000000000000 000000000000 b292c1e3311f Test limiting the max delta chain length $ hg repack --config packs.maxchainlen=1 $ hg debugdatapack $TESTTMP/hgcache/master/packs/*.dataidx $TESTTMP/hgcache/master/packs/f258af4c033dd5cd32b4dbc42a1efcd8e4c7d909: x: Node Delta Base Delta Length Blob Size 1bb2e6237e03 000000000000 8 8 d4a3ed9310e5 1bb2e6237e03 12 6 aee31534993a 000000000000 4 4 1406e7411862 aee31534993a 12 2 Total: 36 20 (80.0% bigger) y: Node Delta Base Delta Length Blob Size 577959738234 000000000000 70 8 Total: 70 8 (775.0% bigger) Test huge pack cleanup using different values of packs.maxpacksize: $ hg repack --incremental --debug $ hg repack --incremental --debug --config packs.maxpacksize=512 removing oversize packfile $TESTTMP/hgcache/master/packs/f258af4c033dd5cd32b4dbc42a1efcd8e4c7d909.datapack (425 bytes) removing oversize packfile $TESTTMP/hgcache/master/packs/f258af4c033dd5cd32b4dbc42a1efcd8e4c7d909.dataidx (1.21 KB) Do a repack where the new pack reuses a delta from the old pack $ clearcache $ hg prefetch -r '2::3' 2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over * (glob) $ hg repack $ hg debugdatapack $CACHEDIR/master/packs/*.datapack $TESTTMP/hgcache/master/packs/9ec6b30891bd851320acb7c66b69a2bdf41c8df3: x: Node Delta Base Delta Length Blob Size 1bb2e6237e03 000000000000 8 8 d4a3ed9310e5 1bb2e6237e03 12 6 Total: 20 14 (42.9% bigger) $ hg prefetch -r '0::1' 2 files fetched over 1 fetches - (2 misses, 0.00% hit ratio) over * (glob) $ hg repack $ hg debugdatapack $CACHEDIR/master/packs/*.datapack $TESTTMP/hgcache/master/packs/156a6c1c83aeb69422d7936e0a46ba9bc06a71c0: x: Node Delta Base Delta Length Blob Size 1bb2e6237e03 000000000000 8 8 d4a3ed9310e5 1bb2e6237e03 12 6 aee31534993a d4a3ed9310e5 12 4 1406e7411862 aee31534993a 12 2 Total: 44 20 (120.0% bigger)