"Too many open files" error?

["Ivan E. Markovic" <iv...@sculptlight.com>]

I am running a stress test on my Servlet based system; there are 
about 30 users being tested simultaneously. It works well for about 5 
10 mins or so and then I get the error listed below and then after 
about another minute the whole system locks up! I cannot hit any of 
the servlets. Apache is still running but Tomcat is hung.

I have checked my code and I don't leave any files open. Am I 
restricted as to the number of users that I have on the system? Can I 
increase the no. of open files? How can I check the number of open 
files that I have?

Thank you for your time.


java.net.SocketException: Too many open files
	at java.net.PlainSocketImpl.accept(Compiled Code)
	at java.net.ServerSocket.implAccept(Compiled Code)
	at java.net.ServerSocket.accept(Compiled Code)
	at 
org.apache.tomcat.service.PoolTcpEndpoint.acceptSocket(Compiled Code)
	at org.apache.tomcat.service.TcpWorkerThread.run(Compiled Code)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
	at java.lang.Thread.run(Compiled Code)
Endpoint ServerSocket[addr=0.0.0.0/0.0.0.0,port=0,localport=8007] 
shutdown due to exception: java.net.SocketException: Too many open 
files


I v a n ...
Ivan Markovic
SculptLight
http://www.sculptlight.com
(+353) 87 2939256
(+353) 1 2982205

114 Lower Churchtown Rd,
Dublin 14,
Ireland.

Re: "Too many open files" error?

[Marcus Crafter <cr...@dresdnerbank.de>]

Hi Ivan,

	What platform are you using ?

	If you're using Linux and have a recent kernel, you can check the
	file and inode limits like this:

	$> cat /proc/sys/fs/file-max
	$> cat /proc/sys/fs/inode-max

	and can change them similarly (as root) with

	$> echo "8192" > /proc/sys/fs/file-max
	$> echo "24576" > /proc/sys/fs/inode-max

	(this info came from the linux kernel mailing list archives, they note
	there that the inode number should be 3 times the file numder)

	Under other Unix's there should be something similar.

	HTH,

	Cheers,

	Marcus

On Wed, 6 Dec 2000, Ivan E. Markovic wrote:

> I am running a stress test on my Servlet based system; there are 
> about 30 users being tested simultaneously. It works well for about 5 
> 10 mins or so and then I get the error listed below and then after 
> about another minute the whole system locks up! I cannot hit any of 
> the servlets. Apache is still running but Tomcat is hung.
> 
> I have checked my code and I don't leave any files open. Am I 
> restricted as to the number of users that I have on the system? Can I 
> increase the no. of open files? How can I check the number of open 
> files that I have?
> 
> Thank you for your time.
> 
> 
> java.net.SocketException: Too many open files
> 	at java.net.PlainSocketImpl.accept(Compiled Code)
> 	at java.net.ServerSocket.implAccept(Compiled Code)
> 	at java.net.ServerSocket.accept(Compiled Code)
> 	at 
> org.apache.tomcat.service.PoolTcpEndpoint.acceptSocket(Compiled Code)
> 	at org.apache.tomcat.service.TcpWorkerThread.run(Compiled Code)
> 	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
> 	at java.lang.Thread.run(Compiled Code)
> Endpoint ServerSocket[addr=0.0.0.0/0.0.0.0,port=0,localport=8007] 
> shutdown due to exception: java.net.SocketException: Too many open 
> files
> 
> 
> I v a n ...
> Ivan Markovic
> SculptLight
> http://www.sculptlight.com
> (+353) 87 2939256
> (+353) 1 2982205
> 
> 114 Lower Churchtown Rd,
> Dublin 14,
> Ireland.
> 
> 

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