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guix/nix
Ludovic Courtès 472a0e82a5
daemon: Do not deduplicate files smaller than 8 KiB.
Files smaller than 8 KiB typically represent ~70% of the entries in
/gnu/store/.links but only contribute to ~4% of the space savings
afforded by deduplication.

Not considering these files for deduplication speeds up file insertion
in the store and, more importantly, leaves 'removeUnusedLinks' with
fewer entries to traverse, thereby speeding it up proportionally.

Partly fixes <https://issues.guix.gnu.org/24937>.

* config-daemon.ac: Remove symlink hard link check and CAN_LINK_SYMLINK
definition.
* guix/store/deduplication.scm (%deduplication-minimum-size): New
variable.
(deduplicate)[loop]: Do not recurse when FILE's size is below
%DEDUPLICATION-MINIMUM-SIZE.
(dump-port): New procedure.
(dump-file/deduplicate)[hash]: Turn into...
[dump-and-compute-hash]: ... this thunk.
Call 'deduplicate' only when SIZE is greater than
%DEDUPLICATION-MINIMUM-SIZE; otherwise call 'dump-port'.
* nix/libstore/gc.cc (LocalStore::removeUnusedLinks): Drop files where
st.st_size < deduplicationMinSize.
* nix/libstore/local-store.hh (deduplicationMinSize): New declaration.
* nix/libstore/optimise-store.cc (deduplicationMinSize): New variable.
(LocalStore::optimisePath_): Return when PATH is a symlink or smaller
than 'deduplicationMinSize'.
* tests/derivations.scm ("identical files are deduplicated"): Produce
files bigger than %DEDUPLICATION-MINIMUM-SIZE.
* tests/nar.scm ("restore-file-set with directories (signed, valid)"):
Likewise.
* tests/store-deduplication.scm ("deduplicate, below %deduplication-minimum-size"):
New test.
("deduplicate", "deduplicate, ENOSPC"): Produce files bigger than
%DEDUPLICATION-MINIMUM-SIZE.
* tests/store.scm ("substitute, deduplication"): Likewise.
2021-11-16 14:34:28 +01:00
..
boost nix: Tweak .gitignore files. 2020-06-24 19:55:22 +01:00
libstore daemon: Do not deduplicate files smaller than 8 KiB. 2021-11-16 14:34:28 +01:00
libutil daemon: 'Agent' constructor takes a list of environment variables. 2020-12-08 22:30:07 +01:00
nix-daemon daemon: Remove dead code. 2021-04-03 22:08:33 +02:00
.gitignore build: Include a copy of Nix's libstore and daemon; build it. 2012-12-03 23:05:08 +01:00
AUTHORS Merge branch 'nix' into 'master'. 2014-12-19 22:47:37 +01:00
COPYING Merge branch 'nix' into 'master'. 2014-12-19 22:47:37 +01:00
local.mk build: Don’t delete ‘guix-gc.timer’ file. 2021-10-01 08:58:06 +00:00