CICSplex JVMPOOL Statistics attribute group

The CICSplex JVMPOOL Statistics attribute group returns statistics for the JVM pool, if one exists. (There is no identifier on JVMPOOL: a CICS region can have only one JVM pool.) CICS returns the address of the area of storage that contains the requested statistics. These statistics can be accessed online using the EXEC CICS COLLECT STATISTICS JVMPOOL command, and are mapped by the DFHSJGDS DSECT.

CICS Region Name Indicates the job name or modify ID of the CICS region being monitored. Each CICS region in a z/OS operating system has a unique name. This name is an alphanumeric string, with a maximum of eight characters, and case-sensitive. CICS region names are always in uppercase characters.

Current Classcache JVMs Is the number of JVMs currently in the pool that use the shared class cache. JVMs use the shared class cache if they were created using JVM profiles that specify CLASSCACHE=YES. This count includes both worker JVMs that are in use by a Java program, and worker JVMs that are awaiting reuse.

Current JVM Count Is the current number of JVMs.

JVM Requests for Class Cache JVMs Is the total number of Java programs that requested a JVM that uses the shared class cache.

JVMs Requests with JVM Initialized Is the number of JVM program requests where the JVM was initialized.

JVMs Requests with JVM Mismatch Is the number of JVM program requests that require a reset or continuous JVM, but for which there was no JVM already initialized with the same JVM profile.

JVMs Requests with JVM Reset Is the number of requests to run a program in a reset JVM.

JVMs Requests with JVM Reuse Is the number of requests to run a program in a continuous JVM.

JVMs Requests with JVM Terminated Is the number of JVMs that have been terminated.

Origin Node The combination of z/OS System ID (SMFID) and CICS region name. The value format is an alphanumeric string, maximum 32 bytes, and case-sensitive.

When a situation is true, the system compares the origin node name in the attribute to the names of managed systems assigned to the item. If the origin node name matches the name of a managed system, the status of the item changes accordingly. If the names of the origin node and the managed systems do not match, the status of the item remains unchanged.

Peak Classcache JVMs Is the peak number of JVMs in the JVM pool that used the shared class cache.

Peak JVM Count Is the peak number of JVMs.

System ID Is the four-character name that uniquely identifies an active z/OS operating system within a given CICSplex. The value format is an alphanumeric string, maximum four characters, and case-sensitive. z/OS System IDs are always in uppercase characters.

Total JVM Requests Is the total number of JVM program requests.