| Demonstrations of virtiostat, the Linux eBPF/bcc version. |
| |
| |
| This program traces virtio devices to analyze the IO operations and |
| throughput. For example, guest side mounts a 9p fs, and we can't get |
| io statistics by `iostat` command any more. In this scenario, we can |
| only get statistics from VIRTIO layer instead of block layer. |
| |
| Example |
| #./virtiostat -T |
| Tracing virtio devices statistics ... Hit Ctrl-C to end. |
| 14:48:30 |
| Driver Device VQ Name In SGs Out SGs In BW Out BW |
| virtio_net virtio0 input.0 260669 0 406743040 0 |
| virtio_net virtio0 output.0 0 9873 0 833344 |
| virtio_blk virtio4 req.0 28 46 448 278976 |
| 9pnet_virtio virtio6 requests 99083 99354 1883687 137537263 |
| 14:48:33 |
| Driver Device VQ Name In SGs Out SGs In BW Out BW |
| virtio_net virtio0 input.0 260718 0 406819328 0 |
| virtio_net virtio0 output.0 0 7139 0 562355 |
| virtio_blk virtio4 req.0 11 18 176 110768 |
| 9pnet_virtio virtio6 requests 91520 91141 1737364 125320785 |
| |
| |
| Show virtio block devices only: |
| #./virtiostat.py -d virtio_blk |
| Tracing virtio devices statistics ... Hit Ctrl-C to end. |
| -------- |
| Driver Device VQ Name In SGs Out SGs In BW Out BW |
| virtio_blk virtio4 req.0 4 6 4 24640 |
| virtio_blk virtio5 req.0 678756 339378 1390431666 5430048 |
| |
| |
| Full USAGE: |
| |
| #./virtiostat -h |
| usage: virtiostat.py [-h] [-T] [-d DRIVER] [-n DEVNAME] [-D] |
| [interval] [count] |
| |
| Show virtio devices input/output statistics |
| |
| positional arguments: |
| interval output interval, in seconds |
| count number of outputs |
| |
| optional arguments: |
| -h, --help show this help message and exit |
| -T, --timestamp show timestamp on output |
| -d DRIVER, --driver DRIVER |
| filter for driver name |
| -n DEVNAME, --devname DEVNAME |
| filter for device name |
| -D, --debug print BPF program before starting (for debugging |
| purposes) |
| |
| examples: |
| ./virtiostat # print 3(default) second summaries |
| ./virtiostat 1 10 # print 1 second summaries, 10 times |
| ./virtiostat -T # show timestamps |
| ./virtiostat -d virtio_blk # only show virtio block devices |
| ./virtiostat -n virtio0 # only show virtio0 device |
| ./virtiostat -D # show debug bpf text |
