CCS Apache Tomcat JIT Dump configuration

Products

• COMMON SERVICES FOR Z/OS

Issue/Introduction

Configuration settings for JIT dumps in CCS Apache Tomcat

Environment

Release 15.0

Resolution

1. In TOMENVPR member, code the following:
   
   IJO="IJO -Xdump:jit:defaults:file=$LOG_DIR/jit.%Y%m%d.%H%M%S.%seq.dmp"


2. To verify that the setting works correctly:
3. Restart Tomcat.
4. Issue command: -Xdump:what
5. This will return the following:

Registered dump agents

-----------------------------------------------------

-Xdump:jit:

    events=gpf+abort,

    files=/<jit dump path>/jitdump.%Y%m%d.%H%M%S.%pid.%seq.dmp

    range=1..0,

    priority=200,

    request=serial

To trigger a JIT dump manually, without terminating Tomcat:

1. Add the following line to the TOMENVPR config:
   
   IJO="$IJO -Xdump:jit:events=user2,request=exclusive+prepwalk"


2. Restart Tomcat
3. Issue Unix command:
   
   kill -s SIGUSR2 <pid>