Manual: virtiostat-bpfcc

virtiostat(8)					   System Manager's Manual				       virtiostat(8)

NAME
       virtiostat - Trace VIRTIO devices input/output statistics. Uses Linux eBPF/bcc.

SYNOPSIS
       virtiostat [-h] [-T] [-D] [-d DRIVER] [-n DEVNAME] [INTERVAL] [COUNT]

DESCRIPTION
       This  tool  traces VIRTIO devices input/output statistics. It works in lower layer of VIRTIO base driver, so it could
       trace all the devices of VIRTIO family. For example, we can't get IO statistics of 9p-fs in a guest  virtual  machine
       by  iostat  command,  but  we can analyze IO statistics by virtiostat.  The outputing result shows In/Out SGs(scatter
       list operation) to represent positive correlation IOPS, and In/Out BW to represent throughput.

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS
       CONFIG_BPF and bcc.

OPTIONS
       -h     Print usage message.

       -T     Include a time column on output (HH:MM:SS).

       -D     Show debug infomation of bpf text.

       -d DRIVER
	      Filter for driver name.

       -n DEVNAME
	      Filter for device name.

       INTERVAL
	      Print output every interval seconds.

       COUNT  Total count of trace in seconds.

EXAMPLES
       Trace virtio device statistics and print 1 second summaries, 10 times:
	      # virtiostat 1 10

       Trace virtio block deivces only:
	      # virtiostat -d virtio_blk

OVERHEAD
       This traces the kernel virtqueue_add_sgs, virtqueue_add_outbuf,	virtqueue_add_inbuf,  virtqueue_add_inbuf_ctx  func‐
       tions.  The rate of this depends on all the VIRTIO devices IOPS.

SOURCE
       This is from bcc.

	      https://github.com/iovisor/bcc

       Also look in the bcc distribution for a companion _examples.txt file containing example usage, output, and commentary
       for this tool.

OS
       Linux

STABILITY
       Unstable - in development.

AUTHOR
       zhenwei pi

SEE ALSO
       iostat(1), iftop(8), funccount(8)

USER COMMANDS						 2021-02-15					       virtiostat(8)