Overview
This blog post will go over how to set up a somewhat trivial macrodef in Apache Ant. Ant basics are assumed.
Monday, April 18, 2011
How to set up an Apache Ant macrodef
Note: this was originally posted December 29, 2010 on my old blog.
This blog post will go over how to set up a somewhat trivial macrodef in Apache Ant. Ant basics are assumed.
This blog post will go over how to set up a somewhat trivial macrodef in Apache Ant. Ant basics are assumed.
Thursday, April 14, 2011
unix shell script: count the file handles for a bunch of processes
Note: this was originally posted April 22, 2009 on my old blog.
We are using WebLogic with the JRockit JVM and noticed tons of issues after a few weeks of uptime - spurious errors and non-responsiveness. The cause? Too many open file handles. Well, actually it's not so much that there's too many open file handles, it's that the OS (Suse Linux Enterprise Server 10) has a very low limit by default. The max file handles is over 400,000 for our production server (it's pretty high-end) but each process is limited to only 1,024.
After googling around a bit to figure out how to up the limit, I also put together this script to log the number of file handles being used by each of our WebLogic servers.
We are using WebLogic with the JRockit JVM and noticed tons of issues after a few weeks of uptime - spurious errors and non-responsiveness. The cause? Too many open file handles. Well, actually it's not so much that there's too many open file handles, it's that the OS (Suse Linux Enterprise Server 10) has a very low limit by default. The max file handles is over 400,000 for our production server (it's pretty high-end) but each process is limited to only 1,024.
After googling around a bit to figure out how to up the limit, I also put together this script to log the number of file handles being used by each of our WebLogic servers.
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