September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Tools for Profiling Erlang Code
The standard Erlang distribution comes with three profiling tools.
-
cprofcounts the number of times each function is called. This is a lightweight profiler. Running this on a live system adds from 5 to 10 percent to the system load. -
fprofdisplays the time for calling and called functions. Output is to a file. This is suitable for large system profiling in a lab or simulated system. It adds significant load to the system. -
eprofmeasures how time is used in Erlang programs. This is a predecessor offprof, which is suitable for small-scale profiling.
Here’s how you run cprof; we’ll use it to profile the
code that we wrote in A SHOUTcast Server:
| | 1> cprof:start(). %% start the profiler |
| | 4501 |
| | 2> shout:start(). ... |
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