s3:g_lock: use TDB_VOLATILE to avoid fcntl locks

This improves 'time smbtorture3 //foo/bar -U% local-g-lock-ping-pong -o 50000000'
from ~1.400.000 to ~3.400.000 operations per second any a testsystem.

As we also use TDB_VOLATILE for locking.tdb, this is a much more
realistic test now.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

diff --git a/source3/lib/g_lock.c b/source3/lib/g_lock.c
index 52a1cf9fa4677624e8fd79c8b42b46d5343a6a07..d683c4ddee6f42f9217bfbad0b5cb393dacad5de 100644 (file)
--- a/source3/lib/g_lock.c
+++ b/source3/lib/g_lock.c
@@ -236,7 +236,7 @@ struct g_lock_ctx *g_lock_ctx_init(TALLOC_CTX *mem_ctx,
                mem_ctx,
                db_path,
                0,
-               TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH,
+               TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH|TDB_VOLATILE,
                O_RDWR|O_CREAT,
                0600,
                DBWRAP_LOCK_ORDER_3,