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Add builtin numaid to get NUMA Node ID #2177

Merged
merged 1 commit into from
Jun 1, 2022
Merged

Add builtin numaid to get NUMA Node ID #2177

merged 1 commit into from
Jun 1, 2022

Commits on May 26, 2022

  1. Add builtin 'numaid' 

    Example:
NUMA node information:

    $ numactl --hardware
    available: 2 nodes (0-1)
    node 0 cpus: 0 1 2 3 4 5 6 7 ...
    [...]
    node 1 cpus: 20 21 22 23 24 25 ...
    [...]
    node distances:
    node   0   1
    0:  10  21
    1:  21  10

bpftrace script code net_action.bt:
    kprobe:net_tx_action,
    kprobe:net_rx_action
    {
        @[numaid, comm] = count();
    }

Example1:
    ------------------------------------------------------------
    iperf3 server:
    $ taskset -c 1 iperf3 -s
    [...]
    [  5]   0.00-1.00   sec  6.04 GBytes  51.9 Gbits/sec
    [...]

    iperf3 client:
    $ taskset -c 2 iperf3 -c 0
    [...]
    [  5]   0.00-1.00   sec  6.04 GBytes  51.9 Gbits/sec    0   1.19 MBytes
    [...]

    net_action.bt output:
    @[0, iperf3]: 2430857

    Because both cpu1 and cpu2 are on the numa node 0.

Example2:
    ------------------------------------------------------------
    iperf3 server:
    $ taskset -c 1 iperf3 -s
    [...]
    [  5]   0.00-1.00   sec  2.79 GBytes  24.0 Gbits/sec
    [...]

    iperf3 client:
    $ taskset -c 21 iperf3 -c 0
    [...]
    [  5]   0.00-1.00   sec  2.79 GBytes  24.0 Gbits/sec    0   1023 KBytes
    [...]

    net_action.bt output:
    @[0, iperf3]: 456193
    @[1, iperf3]: 684853

Because cpu1 on numa node0, cpu21 on numa node1, Processes that
need to communicate running on different nodes cause poor performance,
It is very easy to get numa with `numaid`.
    @Rtoax
    Rtoax committed May 26, 2022
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