tools: add numasched: trace task switch between NUMA #4396
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Rebase to master! |
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Rebase to master. |
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Tasks frequently switch between NUMA, often resulting in poor performance. programs running on the same NUMA will have better performance (usually at the memory level). If processes are migrating between different CPUs and these CPUs belong to different NUMAs, this tool provides an effective means of tracing to optimize the program or configuration. For example: Terminal 1: $ numactl --hardware available: 4 nodes (0-3) node 0 cpus: 0 - 23 node 1 cpus: 24 - 47 node 2 cpus: 48 - 71 node 3 cpus: 72 - 95 Terminal 2: $ sudo ./numasched.py Tracing task NUMA switch... TIME PID SRC_NID DST_NID COMM Terminal 3: $ taskset -c 1 yes >/dev/null & $ taskset -p 0x1000000 $(pidof yes) $ taskset -p 0x1000000000000 $(pidof yes) Then, Terminal 2: $ sudo ./numasched.py Tracing task NUMA switch... TIME PID TID SRC_NID DST_NID COMM 20:55:35 355842 355842 0 -> 1 b'yes' 20:55:50 355842 355842 1 -> 2 b'yes' Signed-off-by: Rong Tao <[email protected]>
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Rebase to master. |
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LGTM. As a followup, could you add a link for the new tool to the README.md? |
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Tasks frequently switch between NUMA, often resulting in poor performance.
programs running on the same NUMA will have better performance (usually at the memory level). If processes are migrating between different CPUs and these CPUs belong to different NUMAs, this tool provides an effective means of tracing to optimize the program or configuration.
For example:
Terminal 1:
Terminal 2:
Terminal 3:
Then, Terminal 2: