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authorKevin Wolf <kwolf@redhat.com>2015-07-10 18:09:18 +0200
committerKevin Wolf <kwolf@redhat.com>2016-06-08 10:21:09 +0200
commitd3199a31c7bc72f6bcecbb3ebcc16940a1721e10 (patch)
treeea8bc6df0b3b2f00e8dd871b02d11fa37b6d6f80 /qemu-img.c
parentb6495fa8493bb56e51506e39a5e575a4404c1cec (diff)
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qemu-img bench: Make start offset configurable
This patch adds an option the specify the offset of the first request made by qemu-img bench. This allows to benchmark misaligned requests. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Denis V. Lunev <den@openvz.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'qemu-img.c')
-rw-r--r--qemu-img.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/qemu-img.c b/qemu-img.c
index 85d1353..480ef8d 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -3515,6 +3515,7 @@ static int img_bench(int argc, char **argv)
bool is_write = false;
int count = 75000;
int depth = 64;
+ int64_t offset = 0;
size_t bufsize = 4096;
int pattern = 0;
int64_t image_size;
@@ -3532,7 +3533,7 @@ static int img_bench(int argc, char **argv)
{"pattern", required_argument, 0, OPTION_PATTERN},
{0, 0, 0, 0}
};
- c = getopt_long(argc, argv, "hc:d:f:nqs:t:w", long_options, NULL);
+ c = getopt_long(argc, argv, "hc:d:f:no:qs:t:w", long_options, NULL);
if (c == -1) {
break;
}
@@ -3570,6 +3571,19 @@ static int img_bench(int argc, char **argv)
case 'n':
flags |= BDRV_O_NATIVE_AIO;
break;
+ case 'o':
+ {
+ char *end;
+ errno = 0;
+ offset = qemu_strtosz_suffix(optarg, &end,
+ QEMU_STRTOSZ_DEFSUFFIX_B);
+ if (offset < 0|| *end) {
+ error_report("Invalid offset specified");
+ return 1;
+ }
+ break;
+ }
+ break;
case 'q':
quiet = true;
break;
@@ -3639,10 +3653,13 @@ static int img_bench(int argc, char **argv)
.bufsize = bufsize,
.nrreq = depth,
.n = count,
+ .offset = offset,
.write = is_write,
};
- printf("Sending %d %s requests, %d bytes each, %d in parallel\n",
- data.n, data.write ? "write" : "read", data.bufsize, data.nrreq);
+ printf("Sending %d %s requests, %d bytes each, %d in parallel "
+ "(starting at offset %" PRId64 ")\n",
+ data.n, data.write ? "write" : "read", data.bufsize, data.nrreq,
+ data.offset);
data.buf = blk_blockalign(blk, data.nrreq * data.bufsize);
memset(data.buf, pattern, data.nrreq * data.bufsize);