Mingming wrote:
On Tue, 2009-09-29 at 16:39 -0600, Andreas Dilger wrote:
I've done some work to merge some of the existing fsx.c mods into a
single version. Over & above the version that is in the LTP, I've
included AKPM's O_DIRECT fixes (with a twist), the BSD mmap page and
segfault handling, and per-write fsync.
The twist for the O_DIRECT feature is that it will randomly open file
descriptors with O_DIRECT, and if you use the Lustre-inspired multi-fd
support (by specifying multiple pathnames for the output file) fsx will
be testing buffered and O_DIRECT and mmap IO on the same file.
Updated patch to have proper fallocate() handling in case glibc doesn't
have this, for non-x86 architectures from MingMing Cao, based on code
used by DB2.
Signed-off-by: Andreas Dilger <adilger@xxxxxxx>
On top of this, a little update to add O_DIRECT define.
Signed-off-by: Mingming Cao <cmm@xxxxxxxxxx>
--- fsx.c.orig 2009-10-02 14:22:12.299565348 -0700
+++ fsx.c 2009-10-01 16:36:17.271593794 -0700
@@ -78,6 +78,10 @@
#define LOGSIZE 100000
+#ifndef O_DIRECT
+#define O_DIRECT 040000 /* direct disk access hint */
+#endif
+
struct log_entry oplog[LOGSIZE]; /* the log */
int logptr = 0; /* current position in log */
int logcount = 0; /* total ops */
I think that
#define _GNU_SOURCE
will pull in the glibc headers' definition rather than doing our own....
-Eric
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