High CPU and poor throughput when compiling JSPs in WebSphere Application Server for z/OS
 Technote (troubleshooting)
 
Problem(Abstract)
While migrating from V50 to V51, you see high CPU and very slow throughput while compiling JSPs. This occurs in a multi system sysplex, shared hierarchical file systems (HFS).
 
Cause
This problem occurs while running in a shared HFS environment. The Java™, WebSphere® smpe root and WebSphere config root HFS are all Read/Write and not Read/Only. This causes contention on latches when accessing files on these three HFSs.

In particular, when JSPs are being compiled, the JAVAC compiler searches the smpe root looking for the required class files. There is extensive contention getting an exclusive latch to read the files or classes.

 
Resolving the problem
Mount the two HFSs Read/Only. This causes shared latch access only, no contention.
 
 
 


Document Information


Current web document: swg21206819.html
Product categories: Software > Application Servers > Distributed Application & Web Servers > WebSphere Application Server for z/OS > 100% CPU Usage
Operating system(s): z/OS
Software version: 6.0.1
Software edition:
Reference #: 1206819
IBM Group: Software Group
Modified date: May 18, 2005