This escript converts erlang's fprof output to valgrind's callgrind output.

To generate the fprof output use fprof:analyse({dest, "outfile.fprof"}).. Do not use totals.

Converting to callgrind is simple, just type: ./erlgrind_script outfile.fprof outfile.cgrind.

You must have escript in your PATH.

Then you can open outfile.cgrind with a tool like kcachegrind.

For a description of fprof's format, check fprof.

For a description of callgrind's format, check callgrind.

# Build:
$ rebar3 escriptize
# Run:
$ _build/default/bin/erlgrind

Usage: erlgrind [Options] <input file .trace/.analysis> [<output file>]
Options:
    -p	use process pid as ELF object
	-h	show this message

If you use a file with a .trace extension, erlgrind will treat it as a file generated with fprof:trace, automatically analyse it with fprof:analyse and proceed with the conversion. The output file name is optional.

The fprof output:

%% Analysis results:
{  analysis_options,
 [{callers, true},
  {sort, acc},
  {totals, false},
  {details, true}]}.

%                                               CNT       ACC       OWN
[{ totals,                                       90,    0.330,    0.330}].  %%%


%                                               CNT       ACC       OWN
[{ "<0.33.0>",                                   90,undefined,    0.330}].   %%

{[{{sort,quicksort,1},                            0,    0.269,    0.007},
  {undefined,                                     0,    0.025,    0.018},
  {{fprof,call,1},                                1,    0.018,    0.014}],
 { {fprof,just_call,2},                           1,    0.312,    0.039},     %
 [{{sort,quicksort_div,4},                        1,    0.262,    0.004},
  {{erlang,demonitor,1},                          1,    0.007,    0.007},
  {{erlang,monitor,2},                            1,    0.004,    0.004},
  {suspend,                                       1,    0.000,    0.000}]}.

{[{undefined,                                     0,    0.269,    0.000},
  {{erl_eval,do_apply,5},                         0,    0.036,    0.003}],
 { {sort,quicksort,1},                            0,    0.305,    0.003},     %
 [{{fprof,just_call,2},                           0,    0.269,    0.007},
  {{fprof,trace,1},                               1,    0.033,    0.004}]}.

{[{{fprof,just_call,2},                           1,    0.262,    0.004},
  {{sort,quicksort_div,4},                       64,    0.000,    0.185}],
 { {sort,quicksort_div,4},                       65,    0.262,    0.189},     %
 [{{sort,merge,3},                                9,    0.073,    0.050},
  {{sort,quicksort_div,4},                       64,    0.000,    0.185}]}.

{[{{sort,quicksort_div,4},                        9,    0.073,    0.050}],
 { {sort,merge,3},                                9,    0.073,    0.050},     %
 [{{erlang,'++',2},                               9,    0.023,    0.023}]}.
 

Will generate the callgrind output:

events: Time
summary: 330
ob=<0.33.0>
fl=fprof
fn={fprof,just_call,2}
1 39
cfl=sort
cfn={sort,quicksort_div,4}
calls=1 1
1 262
cfl=erlang
cfn={erlang,demonitor,1}
calls=1 1
1 7
cfl=erlang
cfn={erlang,monitor,2}
calls=1 1
1 4
cfl=pseudo
cfn=suspend
calls=1 1
1 0
fl=sort
fn={sort,quicksort,1}
1 3
cfl=fprof
cfn={fprof,just_call,2}
calls=0 1
1 269
cfl=fprof
cfn={fprof,trace,1}
calls=1 1
1 33
fl=sort
fn={sort,quicksort_div,4}
1 189
cfl=sort
cfn={sort,merge,3}
calls=9 1
1 73
cfl=sort
cfn={sort,quicksort_div,4}
calls=64 1
1 0
fl=sort
fn={sort,merge,3}
1 50
cfl=erlang
cfn={erlang,'++',2}
calls=9 1
1 23
fl=erl_eval
fn={erl_eval,do_apply,5}
1 0
cfl=sort
cfn={sort,quicksort,1}
calls=0 1
1 36
fl=fprof
fn={fprof,trace,1}
1 4
cfl=fprof
cfn={fprof,call,1}
calls=1 1
1 29
fl=fprof
fn={fprof,call,1}
1 7
cfl=fprof
cfn={fprof,just_call,2}
calls=1 1
1 18
cfl=erlang
cfn={erlang,whereis,1}
calls=1 1
1 4
fl=erlang
fn={erlang,'++',2}
1 23

Where:

• costs are in milliseconds
• ob is set as the Pid of the process that called the function
• file is set as the erlang module
• line numbers are hardcoded as 1

Copyright (c) 2011-2014 Isac Sacchi e Souza [email protected] All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.