rw.d dtrace FreeBSD

rw.d

#!/usr/sbin/dtrace -s

#pragma D option quiet

BEGIN
{
        bio_cmd[1]  = "Read";
        bio_cmd[2]  = "Write";
        bio_cmd[4]  = "Delete";
        bio_cmd[8]  = "Getattr";
        bio_cmd[16] = "Flush";
        start       = timestamp;
}

io:::start
/args[0] != NULL/
{
    ts[args[0]->bio_disk->d_geom->name, args[0]->bio_pblkno] = timestamp;
}

io:::done
/args[0] != NULL && ts[args[0]->bio_disk->d_geom->name, args[0]->bio_pblkno]/
{
        this->delta = (timestamp - ts[args[0]->bio_disk->d_geom->name, args[0]->bio_pblkno]) / 1000;
        this->name = bio_cmd[args[0]->bio_cmd];

        @q[this->name] = quantize(this->delta);
        @a[this->name] = avg(this->delta);
        @v[this->name] = stddev(this->delta);
        @i[this->name] = count();
        @b[this->name] = sum(args[0]->bio_bcount);

        ts[args[0]->bio_disk->d_geom->name, args[0]->bio_pblkno] = 0;
}

END
{
        printa(@q);

        normalize(@i, (timestamp - start) / 1000000000);
        normalize(@b, (timestamp - start) / 1000000000 * 1024);

        printf("%-30s %11s %11s %11s %11s\n", "", "avg latency", "stddev",
            "iops", "throughput");
        printa("%-30s %@9uus %@9uus %@9u/s %@8uk/s\n", @a, @v, @i, @b);
}