js_calltime.d - measure JavaScript elapsed times for types of operation. js_calltime.d This traces JavaScript activity from all browsers running on the system with JavaScript provider support. Filename and function names are printed if available. Any Evolving - uses the DTrace JavaScript provider, which may change as additional features are introduced. Check JavaScript/Readme to see what version these scripts are based on.

Default output, # js_calltime.d

FILE Filename of the JavaScript program

TYPE Type of call (func/obj-new/gc/total)

NAME Name of call

TOTAL Total elapsed time for calls (us)

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. js_calltime.d will run until Ctrl-C is hit. Brendan Gregg [CA, USA] dtrace(1M)