The thread pool fits into the tree of objects as shown in Thread Pool Tree Hierarchy.
The statistics available for thread pools are shown in the following sections:
Use the following dotted name pattern for thread pool statistics:
server.thread-pool.thread-pool.statistic
The statistics available for the thread pool are shown in the following table.
Table 8–33 Thread Pool Monitoring Statistics
Statistic |
Data Type |
Description |
---|---|---|
averagetimeinqueue |
BoundedRangeStatistic |
Average amount of time (in milliseconds) a request waited in the queue before being processed |
averageworkcompletiontime |
BoundedRangeStatistic |
Average amount of time (in milliseconds) taken to complete an assignment |
currentbusythreads |
CountStatistic |
Number of busy threads |
currentnumberofthreads |
BoundedRangeStatistic |
Current number of request processing threads |
numberofavailablethreads |
CountStatistic |
Number of available threads |
numberofworkitemsinqueue |
BoundedRangeStatistic |
Current number of work items waiting in queue |
totalworkitemsadded |
CountStatistic |
Total number of work items added to the work queue as of last sampling |
The statistics available for ThreadInfo in the JVM in Java SE are shown in the following table.
Table 8–34 JVM Monitoring Statistics for Java SE - Thread Info
Statistic |
Data Type |
Description |
---|---|---|
blockedcount |
CountStatistic |
Total number of times that the thread entered the BLOCKED state. |
blockedtime |
CountStatistic |
Time elapsed (in milliseconds) since the thread entered the BLOCKED state. Returns -1 if thread contention monitoring is disabled. |
lockname |
StringStatistic |
String representation of the monitor lock that the thread is blocked to enter or waiting to be notified through the Object.wait method. |
lockownerid |
CountStatistic |
ID of the thread that holds the monitor lock of an object on which this thread is blocking. |
lockownername |
StringStatistic |
Name of the thread that holds the monitor lock of the object this thread is blocking on. |
stacktrace |
StringStatistic |
Stack trace associated with this thread. |
threadid |
CountStatistic |
ID of the thread. |
threadname |
StringStatistic |
Name of the thread. |
threadstate |
StringStatistic |
State of the thread. |
waitedtime |
CountStatistic |
Elapsed time (in milliseconds) that the thread has been in a WAITING state. Returns -1 if thread contention monitoring is disabled. |
waitedcount |
CountStatistic |
Total number of times the thread was in WAITING or TIMED_WAITING states. |