| perf-iostat(1) |
| =============== |
| |
| NAME |
| ---- |
| perf-iostat - Show I/O performance metrics |
| |
| SYNOPSIS |
| -------- |
| [verse] |
| '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 |
| -------- |
| linkperf:perf-stat[1] |
