From 3b23f9acae02e6be192c00fc410a4d15974f5343 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Tue, 2 Jul 2013 10:47:00 -0400 Subject: performance/readdir-ahead: introduce directory read-ahead translator This is a translator to improve the performance of typical, sequential directory reads (i.e., ls). readdir-ahead begins preloading the contents of a directory on open and serves readdir requests from the preloaded content. readdir-ahead is currently implemented to only handle the single threaded directory read case. readdir-ahead is currently disabled by default. It can be enabled with the following command: gluster volume set readdir-ahead on The following are results of a getdents test on a single brick volume. Test info: - Single VM, gluster client/server. - Volume mounted with native client using --gid-timeout=2. - getdents on single directory with 100k 0-byte files. Test results: - !readdir-ahead read 3120080 bytes from offset 0 3 MiB, 4348 ops, 0:00:07.00 (416.590 KiB/sec and 594.4737 ops/sec) - readdir-ahead read 3120080 bytes from offset 0 3 MiB, 4348 ops, 0:00:03.00 (820.116 KiB/sec and 1170.3043 ops/sec) BUG: 980517 Change-Id: Ieceb9e1eb47d1d5b5af8da2bf03839537364653f Signed-off-by: Brian Foster Reviewed-on: http://review.gluster.org/4519 Tested-by: Gluster Build System Reviewed-by: Anand Avati --- xlators/mgmt/glusterd/src/glusterd-volume-set.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'xlators/mgmt/glusterd/src/glusterd-volume-set.c') diff --git a/xlators/mgmt/glusterd/src/glusterd-volume-set.c b/xlators/mgmt/glusterd/src/glusterd-volume-set.c index 738cacd5..7ec8cf75 100644 --- a/xlators/mgmt/glusterd/src/glusterd-volume-set.c +++ b/xlators/mgmt/glusterd/src/glusterd-volume-set.c @@ -845,6 +845,15 @@ struct volopt_map_entry glusterd_volopt_map[] = { .description = "enable/disable read-ahead translator in the volume.", .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT }, + { .key = "performance.readdir-ahead", + .voltype = "performance/readdir-ahead", + .option = "!perf", + .value = "off", + .op_version = 3, + .description = "enable/disable readdir-ahead translator in the volume.", + .flags = OPT_FLAG_CLIENT_OPT | OPT_FLAG_XLATOR_OPT + }, + { .key = "performance.io-cache", .voltype = "performance/io-cache", .option = "!perf", -- cgit