Public bug reported:
I'm using Ubuntu 13.04 dev and have noticed a high cpu overhead if a
process is using multiple threads and computing them on different
threads. To measure this I have written a little script in Python which
I will attach.
The script will create 2 threads which are using only a little time of a
cpu core. On my AMD Phenom II X6 1045T the Linux kernel will assign the
2 threads on 2 cores which will use a total cpu time of 40% from a
maximum of 600%. But if I'm using "taskset -ap 0x00000001 pid_of_script"
the 2 threads will be assigned to 1 core and the total cpu usage will be
only 25% from 600%.
I'm wondering why there is a cpu overhead of 60% if the Linux kernel is
using 2 cores instead of 1 core.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "threads.py"
https://bugs.launchpad.net/bugs/1073148/+attachment/3418558/+files/threads.py
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https://bugs.launchpad.net/bugs/1073148
Title:
High cpu overhead on using multiple cores
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