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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>
master
Kevin Wolf 2015-07-10 18:09:18 +02:00
parent b6495fa849
commit d3199a31c7
3 changed files with 25 additions and 7 deletions
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4
qemu-img-cmds.hx
View File

@ -10,9 +10,9 @@ STEXI
ETEXI
DEF("bench", img_bench,
"bench [-c count] [-d depth] [-f fmt] [-n] [--pattern=pattern] [-q] [-s buffer_size] [-t cache] [-w] filename")
"bench [-c count] [-d depth] [-f fmt] [-n] [-o offset] [--pattern=pattern] [-q] [-s buffer_size] [-t cache] [-w] filename")
STEXI
@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-t @var{cache}] [-w] @var{filename}
@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-o @var{offset}] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-t @var{cache}] [-w] @var{filename}
ETEXI
DEF("check", img_check,

23
qemu-img.c
View File

@ -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);

5
qemu-img.texi
View File

@ -131,13 +131,14 @@ Skip the creation of the target volume
Command description:
@table @option
@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-t @var{cache}] [-w] @var{filename}
@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-o @var{offset}] [--pattern=@var{pattern}] [-q] [-s @var{buffer_size}] [-t @var{cache}] [-w] @var{filename}
Run a simple sequential I/O benchmark on the specified image. If @code{-w} is
specified, a write test is performed, otherwise a read test is performed.
A total number of @var{count} I/O requests is performed, each @var{buffer_size}
bytes in size, and with @var{depth} requests in parallel.
bytes in size, and with @var{depth} requests in parallel. The first request
starts at the position given by @var{offset}.
If @code{-n} is specified, the native AIO backend is used if possible. On
Linux, this option only works if @code{-t none} or @code{-t directsync} is