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author | Jeff King <peff@peff.net> | 2014-09-10 06:03:52 -0400 |
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committer | Junio C Hamano <gitster@pobox.com> | 2014-09-10 10:58:32 -0700 |
commit | 9540ce5030853ffbb7e11c30aa59a5e45095d32c (patch) | |
tree | daaa9507ddd96312a5c41708d3554ccf5cf0169b /t/t4254-am-corrupt.sh | |
parent | Update draft release notes to 2.2 (diff) | |
download | tgif-9540ce5030853ffbb7e11c30aa59a5e45095d32c.tar.xz |
refs: write packed_refs file using stdio
We write each line of a new packed-refs file individually
using a write() syscall (and sometimes 2, if the ref is
peeled). Since each line is only about 50-100 bytes long,
this creates a lot of system call overhead.
We can instead open a stdio handle around our descriptor and
use fprintf to write to it. The extra buffering is not a
problem for us, because nobody will read our new packed-refs
file until we call commit_lock_file (by which point we have
flushed everything).
On a pathological repository with 8.5 million refs, this
dropped the time to run `git pack-refs` from 20s to 6s.
Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 't/t4254-am-corrupt.sh')
0 files changed, 0 insertions, 0 deletions