qemu-img bench
This adds a qemu-img command that allows doing some simple benchmarks for the block layer without involving guest devices and a real VM. For the start, this implements only a test of sequential reads. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Denis V. Lunev <den@openvz.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Kevin Wolf
parent
515c2f431e
commit
b6133b8c68
@ -9,6 +9,12 @@ STEXI
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@table @option
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ETEXI
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DEF("bench", img_bench,
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"bench [-c count] [-d depth] [-f fmt] [-n] [-q] [-s buffer_size] [-t cache] filename")
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STEXI
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@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-q] [-s @var{buffer_size}] [-t @var{cache}] @var{filename}
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ETEXI
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DEF("check", img_check,
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"check [-q] [--object objectdef] [--image-opts] [-f fmt] [--output=ofmt] [-r [leaks | all]] [-T src_cache] filename")
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STEXI
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190
qemu-img.c
190
qemu-img.c
@ -3459,6 +3459,196 @@ out_no_progress:
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return 0;
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}
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typedef struct BenchData {
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BlockBackend *blk;
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uint64_t image_size;
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int bufsize;
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int nrreq;
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int n;
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uint8_t *buf;
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QEMUIOVector *qiov;
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int in_flight;
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uint64_t offset;
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} BenchData;
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static void bench_cb(void *opaque, int ret)
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{
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BenchData *b = opaque;
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BlockAIOCB *acb;
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if (ret < 0) {
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error_report("Failed request: %s\n", strerror(-ret));
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exit(EXIT_FAILURE);
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}
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if (b->in_flight > 0) {
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b->n--;
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b->in_flight--;
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}
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while (b->n > b->in_flight && b->in_flight < b->nrreq) {
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acb = blk_aio_preadv(b->blk, b->offset, b->qiov, 0,
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bench_cb, b);
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if (!acb) {
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error_report("Failed to issue request");
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exit(EXIT_FAILURE);
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}
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b->in_flight++;
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b->offset += b->bufsize;
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b->offset %= b->image_size;
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}
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}
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static int img_bench(int argc, char **argv)
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{
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int c, ret = 0;
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const char *fmt = NULL, *filename;
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bool quiet = false;
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bool image_opts = false;
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int count = 75000;
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int depth = 64;
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size_t bufsize = 4096;
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int64_t image_size;
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BlockBackend *blk = NULL;
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BenchData data = {};
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int flags = 0;
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bool writethrough;
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struct timeval t1, t2;
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int i;
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for (;;) {
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static const struct option long_options[] = {
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{"help", no_argument, 0, 'h'},
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{"image-opts", no_argument, 0, OPTION_IMAGE_OPTS},
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{0, 0, 0, 0}
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};
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c = getopt_long(argc, argv, "hc:d:f:nqs:t:", long_options, NULL);
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if (c == -1) {
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break;
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}
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switch (c) {
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case 'h':
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case '?':
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help();
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break;
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case 'c':
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{
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char *end;
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errno = 0;
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count = strtoul(optarg, &end, 0);
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if (errno || *end || count > INT_MAX) {
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error_report("Invalid request count specified");
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return 1;
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}
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break;
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}
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case 'd':
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{
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char *end;
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errno = 0;
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depth = strtoul(optarg, &end, 0);
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if (errno || *end || depth > INT_MAX) {
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error_report("Invalid queue depth specified");
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return 1;
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}
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break;
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}
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case 'f':
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fmt = optarg;
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break;
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case 'n':
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flags |= BDRV_O_NATIVE_AIO;
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break;
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case 'q':
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quiet = true;
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break;
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case 's':
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{
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int64_t sval;
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char *end;
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sval = qemu_strtosz_suffix(optarg, &end, QEMU_STRTOSZ_DEFSUFFIX_B);
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if (sval < 0 || sval > INT_MAX || *end) {
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error_report("Invalid buffer size specified");
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return 1;
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}
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bufsize = sval;
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break;
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}
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case 't':
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ret = bdrv_parse_cache_mode(optarg, &flags, &writethrough);
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if (ret < 0) {
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error_report("Invalid cache mode");
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ret = -1;
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goto out;
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}
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break;
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case OPTION_IMAGE_OPTS:
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image_opts = true;
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break;
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}
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}
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if (optind != argc - 1) {
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error_exit("Expecting one image file name");
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}
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filename = argv[argc - 1];
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blk = img_open(image_opts, filename, fmt, flags, writethrough, quiet);
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if (!blk) {
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ret = -1;
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goto out;
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}
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image_size = blk_getlength(blk);
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if (image_size < 0) {
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ret = image_size;
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goto out;
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}
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data = (BenchData) {
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.blk = blk,
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.image_size = image_size,
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.bufsize = bufsize,
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.nrreq = depth,
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.n = count,
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};
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printf("Sending %d requests, %d bytes each, %d in parallel\n",
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data.n, data.bufsize, data.nrreq);
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data.buf = blk_blockalign(blk, data.nrreq * data.bufsize);
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data.qiov = g_new(QEMUIOVector, data.nrreq);
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for (i = 0; i < data.nrreq; i++) {
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qemu_iovec_init(&data.qiov[i], 1);
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qemu_iovec_add(&data.qiov[i],
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data.buf + i * data.bufsize, data.bufsize);
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}
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gettimeofday(&t1, NULL);
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bench_cb(&data, 0);
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while (data.n > 0) {
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main_loop_wait(false);
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}
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gettimeofday(&t2, NULL);
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printf("Run completed in %3.3f seconds.\n",
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(t2.tv_sec - t1.tv_sec)
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+ ((double)(t2.tv_usec - t1.tv_usec) / 1000000));
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out:
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qemu_vfree(data.buf);
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blk_unref(blk);
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if (ret) {
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return 1;
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}
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return 0;
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}
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static const img_cmd_t img_cmds[] = {
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#define DEF(option, callback, arg_string) \
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{ option, callback },
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@ -131,6 +131,16 @@ Skip the creation of the target volume
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Command description:
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@table @option
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@item bench [-c @var{count}] [-d @var{depth}] [-f @var{fmt}] [-n] [-q] [-s @var{buffer_size}] [-t @var{cache}] @var{filename}
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Run a simple sequential read benchmark on the specified image. A total number
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of @var{count} I/O requests is performed, each @var{buffer_size} bytes in size,
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and with @var{depth} requests in parallel.
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If @code{-n} is specified, the native AIO backend is used if possible. On
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Linux, this option only works if @code{-t none} or @code{-t directsync} is
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specified as well.
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@item check [-f @var{fmt}] [--output=@var{ofmt}] [-r [leaks | all]] [-T @var{src_cache}] @var{filename}
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Perform a consistency check on the disk image @var{filename}. The command can
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