Current File : //usr/share/doc/bpfcc-tools/examples/doc/virtiostat_example.txt
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
Mini Shell