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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Phil,lsof will show you the open file handles and the owners of those handles. That can give you a clue about what's going on.
We encountered this problem when we started using Hudson running under Tomcat for continuous integration. Turns out that Hudson has a known bug that keeps too many pipes open. We now regularly run the Hudson garbage collector to keep this from happening. This page describes the problem, but may also provide some clues for debugging your situation: http://issues.hudson-ci.org/browse/HUDSON-715.
Anne Phil Cogbill wrote:
We are running THREDDS 4.1.4 here and we have Java 1.6.0_13 with apache tomcat 6.0.16. For the past few days we are getting around 5GB-13GB a day of this catalina error....Apr 1, 2010 12:01:13 PM org.apache.jk.common.ChannelSocket acceptConnections WARNING: Exception executing accept java.net.SocketException: *Too many open files* at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384) at java.net.ServerSocket.implAccept(ServerSocket.java:453) at java.net.ServerSocket.accept(ServerSocket.java:421) at org.apache.jk.common.ChannelSocket.accept(ChannelSocket.java:306)at org.apache.jk.common.ChannelSocket.acceptConnections(ChannelSocket.java:660) at org.apache.jk.common.ChannelSocket$SocketAcceptor.runIt(ChannelSocket.java:870) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)at java.lang.Thread.run(Thread.java:619)I have increased the ulimit on the server to 2048 for number of open files and we are still hitting that limit. It keeps the log files down to around 2GB a day, but is still an issue. Recently it tends to hover around 1200+ files open normally, but after I restart it drops down to 300-400. If I force it to run the garbage collector it still is not closing the file handles. Any ideas on what may be going on?Thanks, Phil -- Phil Cogbill Computer Systems Analyst, STG, Inc., Government Contractor CSMD/DAAB National Climatic Data Center 115 Patton Ave. Asheville, NC 28801-5001 Phil.Cogbill@xxxxxxxx 828-271-4474
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