API Reference tools v3.5

Modules

cover

The module cover provides a set of functions for coverage analysis of Erlang programs, counting how many times each executable line of code is executed when a program is run.
An executable line contains an Erlang expression such as a matching or a function call. A blank line or a line containing a comment, function head or pattern in a case- or receive statement is not executable.

cprof

The cprof module is used to profile a program to find out how many times different functions are called. Breakpoints similar to local call trace, but containing a counter, are used to minimise runtime performance impact.

eprof

The module eprof provides a set of functions for time profiling of Erlang programs to find out how the execution time is used. The profiling is done using the Erlang trace BIFs. Tracing of local function calls for a specified set of processes is enabled when profiling is begun, and disabled when profiling is stopped.

fprof

This module is used to profile a program to find out how the execution time is used. Trace to file is used to minimize runtime performance impact.

instrument

The module instrument contains support for studying the resource usage in an Erlang runtime system. Currently, only the allocation of memory can be studied.

lcnt

The lcnt module is used to profile the internal ethread locks in the Erlang Runtime System. With lcnt enabled, internal counters in the runtime system are updated each time a lock is taken. The counters stores information about the number of acquisition tries and the number of collisions that has occurred during the acquisition tries. The counters also record the waiting time a lock has caused for a blocked thread when a collision has occurred.

make

The module make provides a set of functions similar to the UNIX type Make functions.