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88 lines
2.9 KiB
88 lines
2.9 KiB
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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