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Useful linux commands
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| #!/bin/bash | |
| # Command to check top consumers of open files in linux | |
| lsof | awk '{ print $2; }' | sort -rn | uniq -c | sort -rn | head | |
| # List of processes id with the number of inotify instances they are consuming, | |
| # sorted by the number of inotify instances being consumed | |
| for inot in /proc/*/fd/*; do readlink -f $inot; done | grep inotify | sort | uniq -c | sort -nr | |
| # Increase inotify watches and instances | |
| echo "fs.inotify.max_user_watches=524288" >> /etc/sysctl.conf | |
| echo "fs.inotify.max_user_instances=512" >> /etc/sysctl.conf | |
| # To detect cgroups mode | |
| # Ref: https://unix.stackexchange.com/questions/480747/how-to-find-out-if-systemd-uses-legacy-hybrid-or-unified-mode-cgroupsv1-vs-cgr | |
| # Ref: https://lists.freedesktop.org/archives/systemd-devel/2018-November/041644.html | |
| [ $(stat -fc %T /sys/fs/cgroup/) = "cgroup2fs" ] && echo "unified" || ( [ -e /sys/fs/cgroup/unified/ ] && echo "hybrid" || echo "legacy") | |
| # Generate network traffic | |
| # Start server in UDP mode | |
| # Ensure to set -B for UDP mode for correct behaviour | |
| iperf -s -u | |
| # Start client to send traffic at a rate of 10Mb/s for 30s | |
| iperf -c <ip> -u -b 10m -t 30 | |
| # RDMA tests | |
| # Number of qp can be configured by using -q on both server and client | |
| # Server side | |
| ib_write_bw -d mlx5_0 --report_gbits | |
| # Client side for running test for 600 seconds | |
| ib_write_bw -d mlx5_0 --report_gbits -F <ip> -D 600 |
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