High CPU usage when matlab is idle on Linux

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Livio
Livio 2012-7-18
Hi all, I installed Matlab 7.14.0.739 (R2012a) on a core i5 machine with 4 GiB of RAM. The OS is Ubuntu 11.04 64 bit. Matlab works fine, (apart from some Unix version related issues), but when idle it takes more than 100% CPU. The top command reports:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
17162 newcesir 20 0 1137m 382m 70m S 107 4.8 2:35.14 MATLAB
9 root 20 0 0 0 0 S 21 0.0 898:12.00 ksoftirqd/1
3 root 20 0 0 0 0 S 19 0.0 923:00.86 ksoftirqd/0
13 root 20 0 0 0 0 S 10 0.0 779:41.32 ksoftirqd/2
16 root 20 0 0 0 0 S 0 0.0 640:55.65 ksoftirqd/3
The 4 ksoftirqd processes have something to do with interrupt handling for the 4 processors, and are assciated with the matlab running. The machine is multi user, and having one cpu occupied for every matlab instance started is not good at all. Does anyone know why this is happening? Thank you
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Walter Roberson
Walter Roberson 2012-7-20
Different startup scripts?
Also, I would suggest deleting the MATLAB preferences file and re-creating it.

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Adam Filion
Adam Filion 2012-7-20
编辑：Adam Filion 2012-7-20
Have you rebooted your Linux machine since July 1? If not then that may be the problem. There was a bug with Linux that caused all kinds of problems with the leap second on July 1:
http://www.wired.com/wiredenterprise/2012/07/leap-second-bug-wreaks-havoc-with-java-linux/
This bug has caused some strange behavior for various programs, MATLAB included. Rebooting the machine fixes the problem. If that doesn't resolve it then I recommend contacting tech support:
http://www.mathworks.com/support/contact_us/index.html
[EDIT fixed links]
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Iain W
Iain W 2013-7-24
编辑：Iain W 2013-7-24
I've just found this thread after experiencing the same issue.
Fresh Ubuntu 13.04 x64 install, fresh R2013a install.
I've just restarted Matlab in an attempt to reproduce the problem, but it hasn't thus far - as above maybe it doesn't do it right away. If I can reliably reproduce I'll post back.
EDIT: Ok, so after reading this comment: https://www.mathworks.co.uk/matlabcentral/answers/38094#comment_141709
I did some tests. I can confirm that in my case triggering the help (then closing it) causes high idle cpu usage.
To reproduce
1 Start matlab.
2 observe idle cpu usage is low.
3 press F1 to pop up help window, close it.
4 Observe erratic/high CPU usage.
I tried the fix they suggest (changing the help renderer) and that appears to solve the problem for me.

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