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tests: disable fsync everywhere

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The "GIT_TEST_FSYNC" environment variable now exists for
disabling fsync() even on packfiles and other "critical" data.

Running "make test -j8 NO_SVN_TESTS=1" on a noisy 8-core system
on an HDD, test runtime drops from ~4 minutes down to ~3 minutes.
Using "GIT_TEST_FSYNC=1" re-enables fsync() for comparison
purposes.

SVN interopability tests are minimally affected since SVN will
still use fsync in various places.

This will also be useful for 3rd-party tools which create
throwaway git repositories of temporary data, but remains
undocumented for end users.

Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eric Wong
2021-10-29 00:15:52 +00:00
committed by Junio C Hamano
parent af6d1d602a
commit 412e4caee3
6 changed files with 48 additions and 2 deletions
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5
write-or-die.c
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@@ -1,4 +1,5 @@
#include "cache.h"
#include "config.h"
#include "run-command.h"
/*
@@ -57,6 +58,10 @@ void fprintf_or_die(FILE *f, const char *fmt, ...)
void fsync_or_die(int fd, const char *msg)
{
if (use_fsync < 0)
use_fsync = git_env_bool("GIT_TEST_FSYNC", 1);
if (!use_fsync)
return;
while (fsync(fd) < 0) {
if (errno != EINTR)
die_errno("fsync error on '%s'", msg);