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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/tools/perf/Documentation/perf-iostat.txt
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perf-iostat(1)

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===============

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NAME

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----

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perf-iostat - Show I/O performance metrics

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SYNOPSIS

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--------

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[verse]

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'perf iostat' list

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'perf iostat' <ports> \-- <command> [<options>]

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DESCRIPTION

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-----------

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Mode is intended to provide four I/O performance metrics per each PCIe root port:

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- Inbound Read   - I/O devices below root port read from the host memory, in MB

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- Inbound Write  - I/O devices below root port write to the host memory, in MB

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- Outbound Read  - CPU reads from I/O devices below root port, in MB

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- Outbound Write - CPU writes to I/O devices below root port, in MB

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OPTIONS

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-------

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<command>...::

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	Any command you can specify in a shell.

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list::

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	List all PCIe root ports.

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<ports>::

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	Select the root ports for monitoring. Comma-separated list is supported.

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EXAMPLES

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--------

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1. List all PCIe root ports (example for 2-S platform):

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   $ perf iostat list

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   S0-uncore_iio_0<0000:00>

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   S1-uncore_iio_0<0000:80>

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   S0-uncore_iio_1<0000:17>

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   S1-uncore_iio_1<0000:85>

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   S0-uncore_iio_2<0000:3a>

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   S1-uncore_iio_2<0000:ae>

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   S0-uncore_iio_3<0000:5d>

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   S1-uncore_iio_3<0000:d7>

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2. Collect metrics for all PCIe root ports:

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   $ perf iostat -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct

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   357708+0 records in

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   357707+0 records out

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   375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s

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    Performance counter stats for 'system wide':

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      port             Inbound Read(MB)    Inbound Write(MB)    Outbound Read(MB)   Outbound Write(MB)

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   0000:00                    1                    0                    2                    3

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   0000:80                    0                    0                    0                    0

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   0000:17               352552                   43                    0                   21

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   0000:85                    0                    0                    0                    0

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   0000:3a                    3                    0                    0                    0

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   0000:ae                    0                    0                    0                    0

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   0000:5d                    0                    0                    0                    0

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   0000:d7                    0                    0                    0                    0

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3. Collect metrics for comma-separated list of PCIe root ports:

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   $ perf iostat 0000:17,0:3a -- dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct

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   357708+0 records in

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   357707+0 records out

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   375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s

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    Performance counter stats for 'system wide':

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      port             Inbound Read(MB)    Inbound Write(MB)    Outbound Read(MB)   Outbound Write(MB)

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   0000:17               358559                   44                    0                   22

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   0000:3a                    3                    2                    0                    0

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        197.081983474 seconds time elapsed

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SEE ALSO

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--------

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linkperf:perf-stat[1]

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