php_flow.d - snoop PHP execution showing function flow. php_flow.d This traces PHP activity from all PHP programs on the system running with PHP provider support. This watches PHP function entries and returns, and indents child function calls. Any Evolving - uses the DTrace Php provider, which may change as additional features are introduced. Check Php/Readme to see what version these scripts are based on.

Default output, # php_flow.d

C CPU-id

TIME(us) Time since boot, us

FILE Filename that this function belongs to

FUNC Function name

-> function entry

<- function return

Watch the first column carefully, it prints the CPU-id. If it changes, then it is very likely that the output has been shuffled.

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