Servers: Monitoring: Performance

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Servers: Monitoring: Performance

Configuration Options Related Tasks Related Topics
This page lets you monitor performance information about this server. You can also use this page to force garbage collection or a thread dump.
Configuration Options

Name Description

Execute Thread Current Idle Count
The number of idle threads assigned to the queue.
MBean Attribute:
ExecuteQueueRuntimeMBean.ExecuteThreadCurrentIdleCount
Oldest Pending Request
The time since the longest waiting request was placed in the queue.
MBean Attribute:
ExecuteQueueRuntimeMBean.PendingRequestOldestTime
Serviced Request Total Count
The number of requests that have been processed by the queue.
MBean Attribute:
ExecuteQueueRuntimeMBean.ServicedRequestTotalCount
Queue Length
The number of waiting requests in the queue.
MBean Attribute:
ExecuteQueueRuntimeMBean.PendingRequestCurrentCount
Heap Free Current
The current amount of memory (in bytes) that is available in the JVM heap.
MBean Attribute:
JVMRuntimeMBean.HeapFreeCurrent
Heap Size Current
The current size (in bytes) of the JVM heap.
MBean Attribute:
JVMRuntimeMBean.HeapSizeCurrent
Heap Size Max
The maximum free memory configured for this JVM.
MBean Attribute:
JVMRuntimeMBean.HeapSizeMax
Heap Free Percent
Percentage of the maximum memory that is free.
MBean Attribute:
JVMRuntimeMBean.HeapFreePercent
Total Physical Memory
The amount (in bytes) of physical memory on the host computer.
The value does not include memory that an operating system makes available through swap space on a disk or other types of virtual memory.
MBean Attribute:
JRockitRuntimeMBean.TotalPhysicalMemory
Free Physical Memory
The amount (in bytes) of physical memory that is currently free on the host computer.
MBean Attribute:
JRockitRuntimeMBean.FreePhysicalMemory
Used Physical Memory
The amount (in bytes) of physical memory that is currently being used on the host computer.
The value describes the memory that is being used by all processes on the computer, not just by the Virtual Machine.
MBean Attribute:
JRockitRuntimeMBean.UsedPhysicalMemory
Total Heap
The amount (in bytes) of memory currently allocated to the Virtual Machine's Java heap.
This value, which is also known as the "heap size," may grow up to the specified maximum heap size.
MBean Attribute:
JRockitRuntimeMBean.TotalHeap
Free Heap
The amount (in bytes) of Java heap memory that is currently free in the Virtual Machine.
MBean Attribute:
JRockitRuntimeMBean.FreeHeap
Used Heap
The amount (in bytes) of Java heap memory that is currently being used by the Virtual Machine.
MBean Attribute:
JRockitRuntimeMBean.UsedHeap
GC Algorithm
The type of garbage collector (GC) that the Virtual Machine is using.
JRockit provides the following types of GCs:

Generational Copying, which is suitable for testing applications on a desktop machine with a small (less then 128 MB) heap.

Single Spaced Concurrent, which reduces or eliminates pauses in the VM that are due to garbage collection. Because it trades memory throughput for reduced pause time, you generally need a larger heap size than with other GC types. If your ordinary Java threads create more garbage than this GC can collect, the VM will pause while the Java threads wait for the garbage collection to finish.

Generational Concurrent, which creates a "nursery" space within the heap. New objects are created within the nursery. When the nursery is full, JRockit "stops-the-world," removes the dead objects from the nursery, and moves live objects to a different space within the heap. Another thread runs in the background to remove dead objects from the non-nursery space. This GC type has a higher memory throughput than a single spaced concurrent GC.

Parallel, which allocates all objects to a single spaced heap. When the heap is full, all Java threads are stopped and every CPU is used to perform a complete garbage collection of the entire heap. This behavior causes longer pause times than for the concurrent collectors but maximizes memory throughput.

MBean Attribute:
JRockitRuntimeMBean.GcAlgorithm
Total GC Count
The number of garbage collection runs that have occurred since the Virtual Machine was started.
MBean Attribute:
JRockitRuntimeMBean.TotalGarbageCollectionCount
Last GC Start
The time at which the last garbage collection run started.
MBean Attribute:
JRockitRuntimeMBean.LastGCStart
Last GC End
The time at which the last garbage collection run ended.
MBean Attribute:
JRockitRuntimeMBean.LastGCEnd
Total GC Time
The number of milliseconds that the Virtual Machine has spent on all garbage collection runs since the VM was started.
MBean Attribute:
JRockitRuntimeMBean.TotalGarbageCollectionTime
Handles Compaction
Indicates whether the VM's garbage collector compacts the Java heap.
Usually the heap is scattered throughout available memory. A garbage collector that compacts the heap defragments the memory space in addition to deleting unused objects.
MBean Attribute:
JRockitRuntimeMBean.GCHandlesCompaction
Concurrent
Indicates whether the VM's garbage collector runs in a separate Java thread concurrently with other Java threads.
MBean Attribute:
JRockitRuntimeMBean.Concurrent
Generational
Indicates whether the VM's garbage collector uses a nursery space.
A nursery is the area of the Java heap that the VM allocates to most objects. Instead of garbage collecting the entire heap, generational garbage collectors focus on the nursery. Because most objects die young, most of the time it is sufficient to garbage collect only the nursery and not the entire heap.
MBean Attribute:
JRockitRuntimeMBean.Generational
Incremental
Indicates whether the VM's garbage collector collects (increments) garbage as it scans the memory space and dumps the garbage at the end of its cycle.
With a non-incremental garbage collector, garbage is dumped as soon as it is encountered.
MBean Attribute:
JRockitRuntimeMBean.Incremental
Parallel
Indicates whether the VM's garbage collector is able to run in parallel on multiple processors if multiple processors are available.
MBean Attribute:
JRockitRuntimeMBean.Parallel
Total Number Of Threads
The number of Java threads (daemon and non-daemon) that are currently running in the Virtual Machine across all processors.
MBean Attribute:
JRockitRuntimeMBean.TotalNumberOfThreads
Number Of Daemon Threads
The number of daemon Java threads currently running in the Virtual Machine across all processors.
MBean Attribute:
JRockitRuntimeMBean.NumberOfDaemonThreads
Number Of Processors
The number of processors on the Virtual Machine's host computer. If this is not a Symmetric Multi Processor (SMP) system, the value will be 1.
MBean Attribute: JRockitRuntimeMBean.NumberOfProcessors
All Processors Average Load
A snapshot of the average load of all processors in the host computer. If the computer has only one processor, this method returns the same value as getJvmProcessorLoad(0).
The value is returned as a double, where 1.0 represents 100% load (no idle time) and 0.0 represents 0% load (pure idle time).
MBean Attribute: JRockitRuntimeMBean.AllProcessorsAverageLoad
JVM Processor Load
A snapshot of the load that the Virtual Machine is placing on all processors in the host computer. If the host contains multiple processors, the value represents a snapshot of the average load.
The value is returned as a double, where 1.0 represents 100% load (no idle time) and 0.0 represents 0% load (pure idle time).
MBean Attribute:
JRockitRuntimeMBean.JvmProcessorLoad

Related Tasks

Monitor servers
Configure health monitoring
Create diagnostic system modules
Monitor Node Manager status

Related Topics

Avoiding and Recovering From Server Failure
Avoiding and Managing Overload
Understanding Server Life Cycle
Managing Server and Server Life Cycle

Name	Description
Execute Thread Current Idle Count	The number of idle threads assigned to the queue. MBean Attribute: `ExecuteQueueRuntimeMBean.ExecuteThreadCurrentIdleCount`
Oldest Pending Request	The time since the longest waiting request was placed in the queue. MBean Attribute: `ExecuteQueueRuntimeMBean.PendingRequestOldestTime`
Serviced Request Total Count	The number of requests that have been processed by the queue. MBean Attribute: `ExecuteQueueRuntimeMBean.ServicedRequestTotalCount`
Queue Length	The number of waiting requests in the queue. MBean Attribute: `ExecuteQueueRuntimeMBean.PendingRequestCurrentCount`
Heap Free Current	The current amount of memory (in bytes) that is available in the JVM heap. MBean Attribute: `JVMRuntimeMBean.HeapFreeCurrent`
Heap Size Current	The current size (in bytes) of the JVM heap. MBean Attribute: `JVMRuntimeMBean.HeapSizeCurrent`
Heap Size Max	The maximum free memory configured for this JVM. MBean Attribute: `JVMRuntimeMBean.HeapSizeMax`
Heap Free Percent	Percentage of the maximum memory that is free. MBean Attribute: `JVMRuntimeMBean.HeapFreePercent`
Total Physical Memory	The amount (in bytes) of physical memory on the host computer. The value does not include memory that an operating system makes available through swap space on a disk or other types of virtual memory. MBean Attribute: `JRockitRuntimeMBean.TotalPhysicalMemory`
Free Physical Memory	The amount (in bytes) of physical memory that is currently free on the host computer. MBean Attribute: `JRockitRuntimeMBean.FreePhysicalMemory`
Used Physical Memory	The amount (in bytes) of physical memory that is currently being used on the host computer. The value describes the memory that is being used by all processes on the computer, not just by the Virtual Machine. MBean Attribute: `JRockitRuntimeMBean.UsedPhysicalMemory`
Total Heap	The amount (in bytes) of memory currently allocated to the Virtual Machine's Java heap. This value, which is also known as the "heap size," may grow up to the specified maximum heap size. MBean Attribute: `JRockitRuntimeMBean.TotalHeap`
Free Heap	The amount (in bytes) of Java heap memory that is currently free in the Virtual Machine. MBean Attribute: `JRockitRuntimeMBean.FreeHeap`
Used Heap	The amount (in bytes) of Java heap memory that is currently being used by the Virtual Machine. MBean Attribute: `JRockitRuntimeMBean.UsedHeap`
GC Algorithm	The type of garbage collector (GC) that the Virtual Machine is using. JRockit provides the following types of GCs: Generational Copying, which is suitable for testing applications on a desktop machine with a small (less then 128 MB) heap. Single Spaced Concurrent, which reduces or eliminates pauses in the VM that are due to garbage collection. Because it trades memory throughput for reduced pause time, you generally need a larger heap size than with other GC types. If your ordinary Java threads create more garbage than this GC can collect, the VM will pause while the Java threads wait for the garbage collection to finish. Generational Concurrent, which creates a "nursery" space within the heap. New objects are created within the nursery. When the nursery is full, JRockit "stops-the-world," removes the dead objects from the nursery, and moves live objects to a different space within the heap. Another thread runs in the background to remove dead objects from the non-nursery space. This GC type has a higher memory throughput than a single spaced concurrent GC. Parallel, which allocates all objects to a single spaced heap. When the heap is full, all Java threads are stopped and every CPU is used to perform a complete garbage collection of the entire heap. This behavior causes longer pause times than for the concurrent collectors but maximizes memory throughput. MBean Attribute: `JRockitRuntimeMBean.GcAlgorithm`
Total GC Count	The number of garbage collection runs that have occurred since the Virtual Machine was started. MBean Attribute: `JRockitRuntimeMBean.TotalGarbageCollectionCount`
Last GC Start	The time at which the last garbage collection run started. MBean Attribute: `JRockitRuntimeMBean.LastGCStart`
Last GC End	The time at which the last garbage collection run ended. MBean Attribute: `JRockitRuntimeMBean.LastGCEnd`
Total GC Time	The number of milliseconds that the Virtual Machine has spent on all garbage collection runs since the VM was started. MBean Attribute: `JRockitRuntimeMBean.TotalGarbageCollectionTime`
Handles Compaction	Indicates whether the VM's garbage collector compacts the Java heap. Usually the heap is scattered throughout available memory. A garbage collector that compacts the heap defragments the memory space in addition to deleting unused objects. MBean Attribute: `JRockitRuntimeMBean.GCHandlesCompaction`
Concurrent	Indicates whether the VM's garbage collector runs in a separate Java thread concurrently with other Java threads. MBean Attribute: `JRockitRuntimeMBean.Concurrent`
Generational	Indicates whether the VM's garbage collector uses a nursery space. A nursery is the area of the Java heap that the VM allocates to most objects. Instead of garbage collecting the entire heap, generational garbage collectors focus on the nursery. Because most objects die young, most of the time it is sufficient to garbage collect only the nursery and not the entire heap. MBean Attribute: `JRockitRuntimeMBean.Generational`
Incremental	Indicates whether the VM's garbage collector collects (increments) garbage as it scans the memory space and dumps the garbage at the end of its cycle. With a non-incremental garbage collector, garbage is dumped as soon as it is encountered. MBean Attribute: `JRockitRuntimeMBean.Incremental`
Parallel	Indicates whether the VM's garbage collector is able to run in parallel on multiple processors if multiple processors are available. MBean Attribute: `JRockitRuntimeMBean.Parallel`
Total Number Of Threads	The number of Java threads (daemon and non-daemon) that are currently running in the Virtual Machine across all processors. MBean Attribute: `JRockitRuntimeMBean.TotalNumberOfThreads`
Number Of Daemon Threads	The number of daemon Java threads currently running in the Virtual Machine across all processors. MBean Attribute: `JRockitRuntimeMBean.NumberOfDaemonThreads`
Number Of Processors	The number of processors on the Virtual Machine's host computer. If this is not a Symmetric Multi Processor (SMP) system, the value will be `1.` `MBean Attribute: JRockitRuntimeMBean.NumberOfProcessors`
All Processors Average Load	A snapshot of the average load of all processors in the host computer. If the computer has only one processor, this method returns the same value as `getJvmProcessorLoad(0).` `The value is returned as a double, where 1.0 represents 100% load (no idle time) and 0.0 represents 0% load (pure idle time).` `MBean Attribute: JRockitRuntimeMBean.AllProcessorsAverageLoad`
JVM Processor Load	A snapshot of the load that the Virtual Machine is placing on all processors in the host computer. If the host contains multiple processors, the value represents a snapshot of the average load. The value is returned as a double, where 1.0 represents 100% load (no idle time) and 0.0 represents 0% load (pure idle time). MBean Attribute: `JRockitRuntimeMBean.JvmProcessorLoad`