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qemu-img bench: Sequential writes

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This extends qemu-img bench with an option that makes it use sequential
writes instead of reads for the test run.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2015-07-10 18:09:18 +02:00
parent b6133b8c68
commit b6495fa849
3 changed files with 44 additions and 11 deletions
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13
qemu-img.texi
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@ -131,16 +131,21 @@ Skip the creation of the target volume
Command description:
@table @option
@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-q] [-s @var{buffer_size}] [-t @var{cache}] @var{filename}
@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}
Run a simple sequential read benchmark on the specified image. 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.
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.
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
specified as well.
For write tests, by default a buffer filled with zeros is written. This can be
overridden with a pattern byte specified by @var{pattern}.
@item check [-f @var{fmt}] [--output=@var{ofmt}] [-r [leaks | all]] [-T @var{src_cache}] @var{filename}
Perform a consistency check on the disk image @var{filename}. The command can