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.
Usage: erlgring [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