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authorBrian Foster <bfoster@redhat.com>2013-07-02 10:47:00 -0400
committerAnand Avati <avati@redhat.com>2013-09-04 09:04:15 -0700
commit3b23f9acae02e6be192c00fc410a4d15974f5343 (patch)
tree69d35296fabbc1438375507cfe610d08cae5c6dd /xlators/performance/readdir-ahead/src/readdir-ahead.h
parent98df12f040d95d6a26047f03988b120984f7439e (diff)
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 <volname> 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 <bfoster@redhat.com> Reviewed-on: http://review.gluster.org/4519 Tested-by: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Anand Avati <avati@redhat.com>
Diffstat (limited to 'xlators/performance/readdir-ahead/src/readdir-ahead.h')
-rw-r--r--xlators/performance/readdir-ahead/src/readdir-ahead.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/xlators/performance/readdir-ahead/src/readdir-ahead.h b/xlators/performance/readdir-ahead/src/readdir-ahead.h
new file mode 100644
index 0000000..e48786d
--- /dev/null
+++ b/xlators/performance/readdir-ahead/src/readdir-ahead.h
@@ -0,0 +1,46 @@
+/*
+ Copyright (c) 2008-2013 Red Hat, Inc. <http://www.redhat.com>
+ This file is part of GlusterFS.
+
+ This file is licensed to you under your choice of the GNU Lesser
+ General Public License, version 3 or any later version (LGPLv3 or
+ later), or the GNU General Public License, version 2 (GPLv2), in all
+ cases as published by the Free Software Foundation.
+*/
+
+#ifndef __READDIR_AHEAD_H
+#define __READDIR_AHEAD_H
+
+/* state flags */
+#define RDA_FD_NEW (1 << 0)
+#define RDA_FD_RUNNING (1 << 1)
+#define RDA_FD_EOD (1 << 2)
+#define RDA_FD_ERROR (1 << 3)
+#define RDA_FD_BYPASS (1 << 4)
+#define RDA_FD_PLUGGED (1 << 5)
+
+struct rda_fd_ctx {
+ off_t cur_offset; /* current head of the ctx */
+ size_t cur_size; /* current size of the preload */
+ off_t next_offset; /* tail of the ctx */
+ uint32_t state;
+ gf_lock_t lock;
+ gf_dirent_t entries;
+ call_frame_t *fill_frame;
+ call_stub_t *stub;
+ int op_errno;
+};
+
+struct rda_local {
+ struct rda_fd_ctx *ctx;
+ fd_t *fd;
+ off_t offset;
+};
+
+struct rda_priv {
+ uint32_t rda_req_size;
+ uint64_t rda_low_wmark;
+ uint64_t rda_high_wmark;
+};
+
+#endif /* __READDIR_AHEAD_H */