Metrics

MyPerf4J can count the following performance metrics:

Method Metrics

• RPS: Request per second
• Count: Total requests
• RT: Response time
  • Avg: Method average response time
  • Min: Method minimum response time
  • Max: Method maximum response time
  • StdDev: Method standard deviation of response time
  • TP50, TP90, TP95, TP99, TP999, TP9999, TP99999, TP100
    • TP: Top Percentile
    • TP90: Is a minimum time under which 90% of requests have been served

JVM GC Metrics

• YoungGcCount: The number of Young Generation collections that have occurred in one time slice
• YoungGcTime: Cumulative Young Generation collection time in one time slice
• AvgYoungGcTime: YoungGC average time in one time slice
• FullGcCount: The number of Old Generation collections that have occurred in one time slice
• FullGcTime: Cumulative Old Generation collection time in one time slice

JVM Thread Metrics

• TotalStarted: The total number of threads created and also started since the Java virtual machine started
• Active: The current number of live threads including daemon and non-daemon threads
• Daemon: The current number of live daemon threads
• Runnable: The current number of runnable threads
• Blocked: The current number of threads blocked waiting for a monitor lock
• Waiting: The current number of waiting threads
• TimedWaiting: The current number of waiting threads with a specified waiting time
• Terminated: The current number of terminated threads
• Peak: The peak live thread count since the Java virtual machine started or peak was reset
• New: The number of threads which has not yet started

JVM Memory Metrics

• HeapInit: The amount of heap memory in bytes that the Java virtual initially requests from the operating system for memory management
• HeapUsed: The amount of used heap memory in bytes
• HeapCommitted: The amount of heap memory in bytes that is committed the Java virtual machine to use
• HeapMax: The maximum amount of heap memory in bytes that can used for memory management
• NonHeapInit: The amount of non-heap memory in bytes that the Java virtual initially requests from the operating system for memory management
• NonHeapUsed: The amount of used non-heap memory in bytes
• NonHeapCommitted: The amount of non-heap memory in bytes that is committed the Java virtual machine to use
• NonHeapMax: The maximum amount of non-heap memory in bytes that can used for memory management

JVM ByteBuff Metrics

• Name: The name representing this buffer pool
• Count: An estimate of the number of buffers in the pool
• MemoryUsed: An estimate of the memory that the Java virtual machine is using for this buffer poo
• MemoryCapacity: An estimate of the total capacity of the buffers in this pool

JVM Class Metrics

• Total: The total number of classes that have been loaded the Java virtual machine has started execution
• Loaded: The number of classes that are currently loaded in Java virtual machine
• Unloaded: The total number of classes unloaded since the Java virtual has started execution

JVM Compilation Metrics

• Time: The elapsed compilation time in one time slice
• TotalTime: The approximate accumlated elapsed time (in milliseconds) spent in compilation

JVM FileDescriptor Metrics

• OpenCount: The number of open file descriptor
• OpenPercent: The number of open file descriptor as a percentage of the maximum number of file descriptor