perf-iostat - Show I/O performance metrics

NAME  SYNOPSIS  DESCRIPTION  OPTIONS  EXAMPLES  SEE ALSO 

NAME

perf-iostat − Show I/O performance metrics

SYNOPSIS

perf iostat list
perf iostat
<ports> −− <command> [<options>]

DESCRIPTION

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

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

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

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

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

OPTIONS

<command>...

Any command you can specify in a shell.

list

List all PCIe root ports.

<ports>

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

EXAMPLES

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

$ perf iostat list
S0−uncore_iio_0<0000:00>
S1−uncore_iio_0<0000:80>
S0−uncore_iio_1<0000:17>
S1−uncore_iio_1<0000:85>
S0−uncore_iio_2<0000:3a>
S1−uncore_iio_2<0000:ae>
S0−uncore_iio_3<0000:5d>
S1−uncore_iio_3<0000:d7>

2. Collect metrics for all PCIe root ports:

$ perf iostat −− dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
357708+0 records in
357707+0 records out
375083606016 bytes (375 GB, 349 GiB) copied, 215.974 s, 1.7 GB/s

Performance counter stats for 'system wide':

port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
0000:00 1 0 2 3
0000:80 0 0 0 0
0000:17 352552 43 0 21
0000:85 0 0 0 0
0000:3a 3 0 0 0
0000:ae 0 0 0 0
0000:5d 0 0 0 0
0000:d7 0 0 0 0

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

$ perf iostat 0000:17,0:3a −− dd if=/dev/zero of=/dev/nvme0n1 bs=1M oflag=direct
357708+0 records in
357707+0 records out
375083606016 bytes (375 GB, 349 GiB) copied, 197.08 s, 1.9 GB/s

Performance counter stats for 'system wide':

port Inbound Read(MB) Inbound Write(MB) Outbound Read(MB) Outbound Write(MB)
0000:17 358559 44 0 22
0000:3a 3 2 0 0

197.081983474 seconds time elapsed

SEE ALSO

perf-stat(1)


Updated 2024-01-29 - jenkler.se | uex.se