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How to investigate "Too many open files" error? [message #540057]

Mon, 14 June 2010 17:30

Frank Theinen

Messages: 10
Registered: July 2009

Junior Member

Hi,

I'm using eclipse-cpp-galileo-SR2-linux-gtk.tar.gz which (amongst others) contains the Eclipse Platform, the C/C++ IDE and the Mylin components. I'm experiencing "Too many open files" errors (details follow below) and I'm looking for a way to investigate further. Since I cannot tell which component creates the problem I'm seeking your advice here. If there is a place more appropriate where to ask please direct me to it.

After running for a few days the java process - which is only used by Eclipse - exhausts the allowed number of open files per process ('ulimit -Hn', 8192). From that time on Eclipse is unable to sensibly 'work' much longer and creates "Too many open files" errors in all components used. Using 'lsof | grep java' (last line shown here)

java 15330 ftheinen 8191r REG 0,3 0 8804280 /proc/15330/maps

shows that about 8000 of the open file descriptors are read accesses to the process memory map file (lines differ in the file descriptor only). Using 'lsof' from time to time shows that the number of file descriptors increases steadily, maybe one or two per minute on average.

How can I systematically investigate which component is creating these file descriptors (without having to do many time consuming experiments)?

Regards, Frank

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Re: How to investigate "Too many open files" error? [message #540767 is a reply to message #540057]

Thu, 17 June 2010 10:00

mxm

Messages: 4
Registered: June 2010

Junior Member

I am experiencing the same problems. I ran eclipse over night and since than

"Too many Files error" after working some minutes, that leads to not being able to store changes and a broken workspace.

I it tried to raise the local limit, but ulimit -n 2000, which is the doubled value, but that does not change anything.

I can not restart, did that help for you? I can not restart here!

[Updated on: Thu, 17 June 2010 10:02]

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Re: How to investigate "Too many open files" error? [message #540854 is a reply to message #540767]

Thu, 17 June 2010 13:46

Frank Theinen

Messages: 10
Registered: July 2009

Junior Member

mxm wrote on Thu, 17 June 2010 06:00

You are setting the 'soft' limit, not the 'hard' limit as with 'ulimit -Hn 2000'. But it doesn't seem to work anyway: I enlarged the hard limit from 8192 to 16384 (soft limit is 1024), but after the java process used file descriptor 8191 the problem occurred again.

Quote:

I can not restart, did that help for you? I can not restart here!

When closing Eclipse the file descriptors are freed, so restarting helps.

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Re: How to investigate "Too many open files" error? [message #540880 is a reply to message #540854]

Thu, 17 June 2010 14:27

mxm

Messages: 4
Registered: June 2010

Junior Member

ok that is a difference.

workbench restart is not possible, eclipse is having problems initalizing due to many files.

-Hn is at 10000 so thats no solution here too

[Updated on: Thu, 17 June 2010 14:27]

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Re: How to investigate "Too many open files" error? [message #544239 is a reply to message #540057]

Fri, 02 July 2010 06:32

No real name

Messages: 2
Registered: July 2010

Junior Member

Hi there,

im having excatly the same problems as described by Frank. After encountering them i upgraded from cpp galileo to cpp helios, but the problem remains. And just increasing the amount of files accessible seems to only delay the problem instead of solving it, due to the steady increasing open files.

any update on this would be much appreciated.

Martin

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