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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Git Mailing List <git@vger.kernel.org>
Subject: rather slow 'git repack' in 'blob:none' partial clones
Date: Sat, 3 Apr 2021 11:04:25 +0200	[thread overview]
Message-ID: <20210403090412.GH2271@szeder.dev> (raw)

Hi,

here are trace timings of running 'git gc' in a "normal" and in a
'blob:none' partial clone:

  $ git clone --bare https://github.com/git/git git-full.git
  $ GIT_TRACE_PERFORMANCE=2 /usr/bin/time --format='elapsed: %E  max RSS: %Mk' git -C git-full.git/ gc
  10:35:24.007277 trace.c:487             performance: 0.001550225 s: git command: /usr/local/libexec/git-core/git pack-refs --all --prune
  10:35:24.044641 trace.c:487             performance: 0.035631270 s: git command: /usr/local/libexec/git-core/git reflog expire --all
  10:35:24.061070 read-cache.c:2315       performance: 0.000008506 s:  read cache ./index
  Enumerating objects: 305283, done.
  Counting objects: 100% (305283/305283), done.
  Delta compression using up to 4 threads
  Compressing objects: 100% (75016/75016), done.
  Writing objects: 100% (305283/305283), done.
  Total 305283 (delta 227928), reused 305283 (delta 227928), pack-reused 0
  10:35:32.604546 trace.c:487             performance: 8.555651283 s: git command: /usr/local/libexec/git-core/git pack-objects --local --delta-base-offset objects/pack/.tmp-2946975-pack --keep-true-parents --honor-pack-keep --non-empty --all --reflog --indexed-objects --unpack-unreachable=2.weeks.ago
  10:35:32.680597 trace.c:487             performance: 8.633068356 s: git command: /usr/local/libexec/git-core/git repack -d -l -A --unpack-unreachable=2.weeks.ago
  10:35:32.683130 trace.c:487             performance: 0.000959377 s: git command: /usr/local/libexec/git-core/git prune --expire 2.weeks.ago
  10:35:32.684401 trace.c:487             performance: 0.000180173 s: git command: /usr/local/libexec/git-core/git worktree prune --expire 3.months.ago
  10:35:32.685730 trace.c:487             performance: 0.000263898 s: git command: /usr/local/libexec/git-core/git rerere gc
  10:35:33.514816 trace.c:487             performance: 9.511597988 s: git command: git -C git-full.git/ gc
  elapsed: 0:09.51  max RSS: 358964k

  $ git clone --bare --filter=blob:none https://github.com/git/git git-partial.git
  $ GIT_TRACE_PERFORMANCE=2 /usr/bin/time --format='elapsed: %E  max RSS: %Mk' git -C git-partial.git/ gc
  10:35:47.637735 trace.c:487             performance: 0.000872539 s: git command: /usr/local/libexec/git-core/git pack-refs --all --prune
  10:35:47.675498 trace.c:487             performance: 0.036246403 s: git command: /usr/local/libexec/git-core/git reflog expire --all
  Enumerating objects: 188205, done.
  Counting objects: 100% (188205/188205), done.
  Delta compression using up to 4 threads
  Compressing objects: 100% (66520/66520), done.
  Writing objects: 100% (188205/188205), done.
  Total 188205 (delta 119967), reused 188205 (delta 119967), pack-reused 0
  10:35:50.081709 trace.c:487             performance: 2.402625839 s: git command: /usr/local/libexec/git-core/git pack-objects --local --delta-base-offset objects/pack/.tmp-2946990-pack
  10:35:50.100131 read-cache.c:2315       performance: 0.000009979 s:  read cache ./index
  10:37:04.973541 trace.c:487             performance: 74.885793630 s: git command: /usr/local/libexec/git-core/git pack-objects --local --delta-base-offset objects/pack/.tmp-2946990-pack --keep-true-parents --honor-pack-keep --non-empty --all --reflog --indexed-objects --exclude-promisor-objects --unpack-unreachable=2.weeks.ago
  Removing duplicate objects: 100% (256/256), done.
  10:37:07.482791 trace.c:487             performance: 79.804973525 s: git command: /usr/local/libexec/git-core/git repack -d -l -A --unpack-unreachable=2.weeks.ago
  10:37:07.549333 trace.c:487             performance: 0.008025426 s: git command: /usr/local/libexec/git-core/git prune --expire 2.weeks.ago --exclude-promisor-objects
  10:37:07.552499 trace.c:487             performance: 0.000362981 s: git command: /usr/local/libexec/git-core/git worktree prune --expire 3.months.ago
  10:37:07.554521 trace.c:487             performance: 0.000273834 s: git command: /usr/local/libexec/git-core/git rerere gc
  10:37:10.168233 trace.c:487             performance: 82.533331484 s: git command: git -C git-partial.git/ gc
  elapsed: 1:22.54  max RSS: 1891832k

Notice the ~9s vs. 82s runtime and ~350M vs. 1.9G memory consumption
increase.  What's going on here?

Also note that that second 'git pack-objects' invocation doesn't show
any progress for ~75s.

FWIW, doing the same in a 'tree:0' partial clone is fast.


             reply	other threads:[~2021-04-03  9:04 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-03  9:04 SZEDER Gábor [this message]
2021-04-05  1:02 ` rather slow 'git repack' in 'blob:none' partial clones Rafael Silva
2021-04-07 21:17   ` Jeff King
2021-04-08  0:02     ` Jonathan Tan
2021-04-08  0:35       ` Jeff King
2021-04-12  7:09     ` Rafael Silva
2021-04-12 21:36     ` SZEDER Gábor
2021-04-12 21:49       ` Bryan Turner
2021-04-12 23:51         ` Jeff King
2021-04-12 23:47       ` Jeff King
2021-04-13  7:12         ` [PATCH 0/3] low-hanging performance fruit with promisor packs Jeff King
2021-04-13  7:15           ` [PATCH 1/3] is_promisor_object(): free tree buffer after parsing Jeff King
2021-04-13 20:17             ` Junio C Hamano
2021-04-14  5:18               ` Jeff King
2021-04-13  7:16           ` [PATCH 2/3] lookup_unknown_object(): take a repository argument Jeff King
2021-04-13  7:17           ` [PATCH 3/3] revision: avoid parsing with --exclude-promisor-objects Jeff King
2021-04-13 20:22             ` Junio C Hamano
2021-04-13 18:10           ` [PATCH 0/3] low-hanging performance fruit with promisor packs SZEDER Gábor
2021-04-14 17:14           ` Jonathan Tan
2021-04-14 19:22           ` Rafael Silva
2021-04-13 18:05         ` rather slow 'git repack' in 'blob:none' partial clones SZEDER Gábor
2021-04-14  5:14           ` Jeff King
2021-04-11 10:59   ` SZEDER Gábor
2021-04-12  7:53     ` Rafael Silva
2021-04-14 19:14 ` [PATCH 0/2] prevent `repack` to unpack and delete promisor objects Rafael Silva
2021-04-14 19:14   ` [PATCH 1/2] repack: teach --no-prune-packed to skip `git prune-packed` Rafael Silva
2021-04-14 23:50     ` Jonathan Tan
2021-04-18 14:15       ` Rafael Silva
2021-04-14 19:14   ` [PATCH 2/2] repack: avoid loosening promisor pack objects in partial clones Rafael Silva
2021-04-15  1:04     ` Jonathan Tan
2021-04-15  3:51       ` Junio C Hamano
2021-04-15  9:03         ` Jeff King
2021-04-15  9:05       ` Jeff King
2021-04-18  7:12       ` Rafael Silva
2021-04-15 18:06     ` Junio C Hamano
2021-04-18  8:40       ` Rafael Silva
2021-04-14 22:10   ` [PATCH 0/2] prevent `repack` to unpack and delete promisor objects Junio C Hamano
2021-04-15  9:15   ` Jeff King
2021-04-18  8:20     ` Rafael Silva
2021-04-18 13:57   ` [PATCH v2 0/1] " Rafael Silva
2021-04-18 13:57     ` [PATCH v2 1/1] repack: avoid loosening promisor objects in partial clones Rafael Silva
2021-04-19 19:15       ` Jonathan Tan
2021-04-21 18:54         ` Rafael Silva
2021-04-19 23:09       ` Junio C Hamano
2021-04-21 19:25         ` Rafael Silva
2021-04-21 19:32     ` [PATCH v3] " Rafael Silva

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