JVM Pool statistics

These statistics can be accessed online using the EXEC CICS® COLLECT STATISTICS JVMPOOL command, and are mapped by the DFHSJGDS DSECT. For programming information about the EXEC CICS COLLECT STATISTICS command, see the CICS System Programming Reference manual.

This section contains the following statistics:

JVM Pool: Global statistics

Table 78. JVM Pool: Global statistics
DFHSTUP name Field name Description
Total number of JVM program requests SJG_JVM_REQS_TOTAL is the total number of JVM program requests.

Reset characteristic: reset to zero

 

Current number of JVMs SJG_CURRENT_JVMS is the current number of JVMs.

Reset characteristic: not reset

 

Peak number of JVMs SJG_PEAK_JVMS is the peak number of JVMs.

Reset characteristic: reset to current

 

Number of JVM program requests -- Reset specified SJG_JVM_REQS_RESET is the number of requests to run a program in a resettable JVM.

Reset characteristic: reset to zero

 

Number of JVM program requests -- Reuse specified SJG_JVM_REQS_REUSE is the number of requests to run a program in a continuous JVM.

Reset characteristic: reset to zero

 

Number of JVM program requests-- JVM initialized SJG_JVM_REQS_INIT is the number of JVM program requests where the JVM was initialized.

Reset characteristic: reset to zero

 

Number of JVM program requests --JVM mismatched SJG_JVM_REQS_MISMATCH is the number of JVM program requests that required a resettable or continuous JVM, but for which there was no JVM already initialized with the same JVM profile.

Reset characteristic: reset to zero

 

Number of JVM program requests--JVM terminated SJG_JVM_REQS_TERMINATE is the number of JVMs that have been terminated.

Reset characteristic: reset to zero

 

Total number of Class Cache JVM requests SJG_JVM_REQS_CACHE is the total number of Java™ programs that requested a JVM that uses the shared class cache.

Reset characteristic: reset to zero

 

Current number of Class Cache JVMs SJG_CURRENT_CACHE_JVMS is the number of JVMs currently in the pool that use the shared class cache, so are worker JVMs. 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.

Reset characteristic: not reset

 

Peak number of Class Cache JVMs SJG_PEAK_CACHE_JVMS is the peak number of JVMs in the JVM pool that used the shared class cache.

Reset characteristic: reset to current value

 

JVM Pool: Summary global statistics

Summary statistics are not available online.

Table 79. JVM Pool: Summary global statistics
DFHSTUP name Description
Total number of JVM program requests is the total number of JVM program requests.

 

Peak number of JVMs is the peak number of JVMs.

 

Number of JVM program requests --Reset specified is the number of requests to run a program in a resettable JVM.

 

Number of JVM program requests --Reuse specified is the number of requests to run a program in a continuous JVM.

 

Number of JVM program requests --JVM initialized is the number of JVM program requests where the JVM was initialized.

 

Number of JVM program requests --JVM mismatched is the number of JVM program requests that required a resettable or continuous JVM, but for which there was no JVM already initialized with the same JVM profile.

 

Number of JVM program requests --JVM terminated is the number of JVMs that have been terminated.

 

Total number of Class Cache JVM requests is the total number of Java programs that requested a JVM that uses the shared class cache.

 

Peak number of Class Cache JVMs is the peak number of JVMs in the JVM pool that used the shared class cache.

 

Related reference
Back to full list of statistics and DFHSTUP reports
Appendix A. CICS statistics tables
Interpreting these statistics
Interpreting JVM statistics
DFH0STAT reports for these statistics
JVM Pool and Class Cache Report
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