NAME

j_calls.d - count Java calls (method/...) using DTrace.

SYNOPSIS

j_calls.d

DESCRIPTION

This traces activity from all Java processes on the system with hotspot provider support (1.6.0). Method calls and object allocation are only visible when using the flag "+ExtendedDTraceProbes". eg, java -XX:+ExtendedDTraceProbes classfile

TYPEs: cload class load method method call mcompile method compile mload compiled method load oalloc object alloc thread thread start

OS

Solaris

STABILITY

Evolving - uses the DTrace hotspot provider, which may change as additional features are introduced. Check Java/Readme to see what version these scripts are based on.

EXAMPLES

Default output,

# j_calls.d

FIELDS

PID

Process ID

TYPE

Type of call (see below)

NAME

Name of call

COUNT

Number of calls during sample

DOCUMENTATION

See the DTraceToolkit for further documentation under the Examples, Notes and Docs directories. The example files may be especially useful as they aim to demonstrate how to interpret the output.

EXIT

j_calls.d will run until Ctrl-C is hit.

AUTHOR

Brendan Gregg [CA, USA]

SEE ALSO

dtrace(1M)