HP jmeter Software for -UX manual Jvmpi

hot spot	A section of code, typically a method, with a higher-than-normal level of execution or access
	requiring high CPU usage.
inclusive time	The accumulated total time used by all invocations of the method and all methods that were
	called from it directly or indirectly.
inlining	Replacing a call to a function with an instance of the function; usually done at compile time.
Java Management	See JMX .
Extensions
JMX™	Java Management Extensions. API for managing and monitoring applications, devices, services,
	and JVMs. For API specifics, see the Java Community Process web: Java Management Extensions
	(JMX) Specification (JSR3) and JMX Remote Specification (JSR160).
JVM	Java Virtual Machine
JVM agent	A module running on each managed node that collects data and sends it to the node agent,
	which sends it to the console.
JVM agent filters	The include and exclude options to the JVM agent allow you to filter metrics by class name.
	For details, see Controlling Data Collection and Display (page 36)
JVMPI	JVM Profiler Interface
JVMTI	JVM Tool Interface
lingering objects	accumulated live objects that clog the heap, creating memory leaks.
lock contention	The summary time measured from the moment the thread requests a Java lock until the lock
	is actually granted.
Lock Delay	The time elapsed between the moment a thread tries to acquire a lock and the time the thread
	enters the monitor.
managed node	A computer on which the HPjmeter node agent and JVM agent are installed.
memory leak	HPjmeter uses the long term linear upward trends in the heap size after garbage collections to
	calculate the likely presence of memory leaks. See How Memory Leak Detection Works (page 189)
metadata	Objects needed by the Java interpreter and for reflection in garbage collection.
method	A function defined in a class. Unless specified otherwise, a method is not static.
method call count	The number of times each function (method) of the program was called during a run.
method clock	The actual time spent in each of the methods of the program.
time
metric	In this context, a mapping that associates numerical values with static or dynamic elements
	such as program functions, variables, classes, objects, types, or threads.
node agent	A process that manages communication between JVM agents and a console. Node Agent
	(page 13)
old generation	Objects in the heap that have survived a successive number of garbage collections, and have
	been moved to the old space in the heap.
package	A group of types. Packages are declared with the package keyword.
reduction	Accumulating data during tracing such that consecutive calls from the same caller to the same
	callee increase the recorded time value for a call.
scavenge	Incremental, lightweight garbage collection of primarily short-lived objects in order to free
	space.
scope	The breadth of view across thread-based profile data. HPjmeter lets you look at a single thread,
	a group of threads, or the entire application.
service-level	service-level objective. A service-level objective (SLO) partitions a service-level agreement (SLA)
objective	into metrics and operational information to enforce and/or monitor the SLA.
session	An open, live connection between an console and a JVM agent running on a managed node.
	An open session has associated with it a set of metrics, filters, and alerts that are configured
	when you open the session.
severity	The measure of the expected impact of the detected situation on the application stability.
SLO	See service-level objective.

200 Glossary