Public bug reported:
Setup your system to allow for many processes. Then run:
seq 70000 | xargs -P0 -n1 -I {} bash -c 'echo {};sleep {}'
When the number hits 50000 (and you have 100000 processes running on the
system), then `pstree` is much slower than `ps aux`.
$ time ps aux >/dev/null
real 0m30.576s
user 0m6.760s
sys 0m22.336s
$ time pstree >/dev/null
real 14m31.470s
user 13m15.556s
sys 0m51.852s
This suggests that the algorithm for `pstree` is suboptimal when you
have many processes.
** Affects: psmisc (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1764458
Title:
pstree slower than ps aux
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