.NODE

The profile Module

The profile module is the standard Python profiler.

Like the disassembler and the debugger, you can run the profiler from the command line:

$ profile.py hello.py

hello again, and welcome to the show

 3 function calls in 0.785 CPU seconds

 Ordered by: standard name

 ncalls tottime percall cumtime percall filename:lineno(function)
 1 0.001 0.001 0.002 0.002 :1(?)
 1 0.001 0.001 0.001 0.001 hello.py:1(?)
 1 0.783 0.783 0.785 0.785 profile:0(execfile('hello.py'))
 0 0.000 0.000 profile:0(profiler)

It can also be used to profile part of a program, as Example 11-4 shows.

Example 11-4. Using the profile Module

File: profile-example-1.py

import profile

def func1():
 for i in range(1000):
 pass

def func2():
 for i in range(1000):
 func1()

profile.run("func2()")

 1003 function calls in 2.380 CPU seconds

 Ordered by: standard name

 ncalls tottime percall cumtime percall filename:lineno(function)
 1 0.000 0.000 2.040 2.040 :1(?)
 1000 1.950 0.002 1.950 0.002 profile-example-1.py:3(func1)
 1 0.090 0.090 2.040 2.040 profile-example-1.py:7(func2)
 1 0.340 0.340 2.380 2.380 profile:0(func2())
 0 0.000 0.000 profile:0(profiler)

You can modify the report to suit your needs, via the pstats module.

Core Modules

More Standard Modules

Threads and Processes

Data Representation

File Formats

Mail and News Message Processing

Network Protocols

Internationalization

Multimedia Modules

Data Storage

Tools and Utilities

Platform-Specific Modules

Implementation Support Modules

Other Modules





Python Standard Library
Python Standard Library (Nutshell Handbooks) with
ISBN: 0596000960
EAN: 2147483647
Year: 2000
Pages: 252
Authors: Fredrik Lundh
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