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Merge branch 'fr/pack-objects-trace-pack-bytes' 

The pack-objects command has been updated to record the total bytes
written to pack files in trace2 output, allowing performance
analysis of different compression settings by comparing the
resulting pack sizes.

* fr/pack-objects-trace-pack-bytes:
  pack-objects: trace pack bytes written
main
Junio C Hamano 2026-08-31 08:25:00 -07:00
parent 923bf36c46 a6c983765f
commit 6e75a57d1b
2 changed files with 29 additions and 0 deletions
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5
builtin/pack-objects.c
View File

@ -1338,6 +1338,7 @@ static void write_pack_file(void)
uint32_t nr_remaining = nr_result;
time_t last_mtime = 0;
struct object_entry **write_order;
off_t bytes_written = 0;

if (progress > pack_to_stdout)
progress_state = start_progress(the_repository,
@ -1390,6 +1391,8 @@ static void write_pack_file(void)
display_progress(progress_state, written);
}

bytes_written += hashfile_total(f) +
the_repository->hash_algo->rawsz;
if (pack_to_stdout) {
/*
* We never fsync when writing to stdout since we may
@ -1511,6 +1514,8 @@ static void write_pack_file(void)
written, nr_result);
trace2_data_intmax("pack-objects", the_repository,
"write_pack_file/wrote", nr_result);
trace2_data_intmax("pack-objects", the_repository,
"write_pack_file/wrote_bytes", bytes_written);
}

static int no_try_delta(const char *path)

24
t/t5300-pack-object.sh
View File

@ -33,6 +33,30 @@ test_expect_success 'setup' '
} >expect
'

test_expect_success 'pack-object traces bytes written to stdout' '
test_when_finished "rm -f pack.trace pack.pack" &&
GIT_TRACE2_EVENT="$PWD/pack.trace" \
git pack-objects --quiet --revs --stdout >pack.pack <<-EOF &&
$commit
EOF
bytes=$(test_file_size pack.pack) &&
test_grep "\"key\":\"write_pack_file/wrote_bytes\",\"value\":\"$bytes\"" pack.trace
'

test_expect_success 'pack-object traces bytes written to split pack files' '
test_when_finished "rm -f split.trace traced-pack-*" &&
GIT_TRACE2_EVENT="$PWD/split.trace" \
git -c pack.packSizeLimit=3m pack-objects --quiet traced-pack <obj-list &&
test 2 = $(ls traced-pack-*.pack | wc -l) &&
bytes=0 &&
for pack in traced-pack-*.pack
do
pack_size=$(test_file_size "$pack") &&
bytes=$((bytes + pack_size)) || return 1
done &&
test_grep "\"key\":\"write_pack_file/wrote_bytes\",\"value\":\"$bytes\"" split.trace
'

test_expect_success 'setup pack-object <stdin' '
git init pack-object-stdin &&
test_commit -C pack-object-stdin one &&