[pull] master from git:master#221
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When resolving a delta whose result has children of its own,
index-pack adds the result to work_head, accounts its data in
base_cache_used, and calls prune_base_data(). It then immediately frees
that same data.
This bypasses the existing delta base cache policy and can force later
descendants to reconstruct the queued base again. Let the existing
delta_base_cache_limit pruning policy decide whether to keep or evict
the data instead.
This does not add a new cache or increase the cache limit. The object
data is already accounted in base_cache_used before prune_base_data()
runs, and the existing pruning and base cleanup paths still release it.
On a quiet Ubuntu 24.04 VM with 16 vCPUs, 32 GiB RAM, and local SSD,
direct index-pack timings on single-pack Linux fixtures improved as
follows:
linux blobless: 69.17s -> 57.98s (16.2% faster), RSS flat
linux full: 280.72s -> 236.32s (15.8% faster), RSS +1.9%
Five-repeat medians on public repositories also improved:
git.git: 12.31s -> 10.70s (13.1% faster)
libgit2: 3.35s -> 2.88s (14.0% faster)
redis: 6.52s -> 5.64s (13.5% faster)
cpython: 33.02s -> 31.44s (4.8% faster)
The standard p5302 perf test on a smaller git.git fixture was neutral:
5302.9 index-pack default threads:
11.21(38.07+1.33) -> 11.16(37.90+1.31), -0.4%
t/t5302-pack-index.sh passed, and GitGitGadget's linux-leaks CI also
exercised that test under SANITIZE=leak.
Signed-off-by: Arijit Banerjee <arijit@effectiveailabs.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Without NO_RUST defined, the varint encoder/decoder lives in the
RUST_LIB, which needs to be linked. Symptom:
cc [... -o contrib/credential/osxkeychain/git-credential-osxkeychain [...]
Undefined symbols for architecture x86_64:
"_decode_varint", referenced from:
_read_untracked_extension in libgit.a[x86_64][63](dir.o)
_read_untracked_extension in libgit.a[x86_64][63](dir.o)
_read_one_dir in libgit.a[x86_64][63](dir.o)
_read_one_dir in libgit.a[x86_64][63](dir.o)
_load_cache_entry_block in libgit.a[x86_64][174](read-cache.o)
"_encode_varint", referenced from:
_write_untracked_extension in libgit.a[x86_64][63](dir.o)
_write_untracked_extension in libgit.a[x86_64][63](dir.o)
_write_untracked_extension in libgit.a[x86_64][63](dir.o)
_write_one_dir in libgit.a[x86_64][63](dir.o)
_write_one_dir in libgit.a[x86_64][63](dir.o)
_do_write_index in libgit.a[x86_64][174](read-cache.o)
ld: symbol(s) not found for architecture x86_64
While it is curious why these functions are needed at all (osxkeychain
does not read or write the index), the compile error is a real problem.
Instead of trying to play games to add `GITLIBS` while filtering out
`common-main.o`, replace the `$(LIB_FILE) $(EXTLIBS)` construct with the
much shorter `$(LIBS)` construct that _already_ filters out
`common-main.o` and adds the Rust library when needed.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Build fix. * js/osxkeychain-build-wo-rust: osxkeychain: fix build with Rust
"git index-pack" has been optimized by retaining child bases in the delta cache instead of immediately freeing them, letting the existing cache limit policy decide eviction. * ab/index-pack-retain-child-bases: index-pack: retain child bases in delta cache
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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