Hi, I can't reproduce the issue with Focal (20.04) and Jammy (22.04)
containers. Using your C code, I consistently get similar performance
(around 9.5 seconds on my system). In the Jammy container I tried both
the Focal binary and a freshly compiled binary, to be sure, and the perf
was the same.
Could you run `apport-collect 2101201` on your system so that we get
more information?
Also, could you try your code in a Focal container on your Jammy system,
to see if you get similarly low performance? If so, that would hint at a
kernel-level problem.
** Changed in: glibc (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2101201
Title:
The performance of the rand() function degradation
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