Monitoring the Java Virtual Machine
By Paul Tremblett, April 01, 2006
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Java Management Extensions (JMX) provide tools for monitoring and managing applications and the resources they use.
April, 2006: Monitoring the Java Virtual Machine
OPERATING SYSTEM:
architecture = ppc
name = Mac OS X
version = 10.4.3
processors = 1
RUNTIME:
name = 975@munchkin.local
spec name = Java Virtual Machine Specification
vendor = Sun Microsystems Inc.
spec version = 1.0
management spec version = 1.0
CLASS LOADING SYSTEM:
isVerbose = false
loadedClassCount = 371
totalLoadedClassCount = 371
unloadedClassCount = 0
COMPILATION
totalCompilationTime = 150
MEMORY:
HEAP STORAGE:
committed = 2031616
init = 0
max = 66387968
used = 399648
NON_HEAP STORAGE
committed = 30113792
init = 29523968
max = 121634816
used = 11508000
name: Code Cache
Manager Name: CodeCacheManager
mtype = Non-heap memory
Usage threshold supported = true
name: Eden Space
Manager Name: MarkSweepCompact
Manager Name: Copy
mtype = Heap memory
Usage threshold supported = false
name: Survivor Space
Manager Name: MarkSweepCompact
Manager Name: Copy
mtype = Heap memory
Usage threshold supported = false
name: Tenured Gen
Manager Name: MarkSweepCompact
mtype = Heap memory
Usage threshold supported = true
name: Perm Gen
Manager Name: MarkSweepCompact
mtype = Non-heap memory
Usage threshold supported = true
name: Perm Gen [shared-ro]
Manager Name: MarkSweepCompact
mtype = Non-heap memory
Usage threshold supported = true
name: Perm Gen [shared-rw]
Manager Name: MarkSweepCompact
mtype = Non-heap memory
Usage threshold supported = true
THREADS:
Thread name = Signal Dispatcher
Thread name = Finalizer
Thread name = Reference Handler
Thread name = main
GARBAGE COLLECTION:
name = Copy
collection count = 0
collection time = 0
mpool name = Eden Space
mpool name = Survivor Space
name = MarkSweepCompact
collection count = 0
collection time = 0
mpool name = Eden Space
mpool name = Survivor Space
mpool name = Tenured Gen
mpool name = Perm Gen
mpool name = Perm Gen [shared-ro]
mpool name = Perm Gen [shared-rw]
Figure 2: Output from the MXBDemo1 program.
