Now with the patch [1] applied, it is back to normal.
$ dpkg -s libc6 | grep Version:
Version: 2.35-0ubuntu3.8+gd47c5e4db792
Without per-CPU affinity (average: 63ms) -- no regression
$ ./test-glibc-malloc 56 false false
nr_cpu: 56 pin: no fix: no
thread average (ms): 69.927953
$ ./test-glibc-malloc 56 false false
nr_cpu: 56 pin: no fix: no
thread average (ms): 60.017631
$ ./test-glibc-malloc 56 false false
nr_cpu: 56 pin: no fix: no
thread average (ms): 63.712696
$ ./test-glibc-malloc 56 false false
nr_cpu: 56 pin: no fix: no
thread average (ms): 61.139623
$ ./test-glibc-malloc 56 false false
nr_cpu: 56 pin: no fix: no
thread average (ms): 63.322566
With per-CPU affinity (average: 58ms) -- improvement, back to normal
$ ./test-glibc-malloc 56 true false
nr_cpu: 56 pin: yes fix: no
thread average (ms): 63.215897
$ ./test-glibc-malloc 56 true false
nr_cpu: 56 pin: yes fix: no
thread average (ms): 58.465390
$ ./test-glibc-malloc 56 true false
nr_cpu: 56 pin: yes fix: no
thread average (ms): 55.773076
$ ./test-glibc-malloc 56 true false
nr_cpu: 56 pin: yes fix: no
thread average (ms): 57.536929
$ ./test-glibc-malloc 56 true false
nr_cpu: 56 pin: yes fix: no
thread average (ms): 55.459689
[1]
https://sourceware.org/git/?p=glibc.git;a=commit;h=472894d2cfee5751b44c0aaa71ed87df81c8e62e
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https://bugs.launchpad.net/bugs/2089789
Title:
malloc performance degradation with CPU affinity masks
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