fprof
相关文档 http://erlangdisplay.iteye.com/blog/318975
输出文件test.analyse 测试
Eshell V5.7.4 (abort with ^G)
1> fprof:trace([start,{file,test.trace}]).
ok
2> fprof:trace(stop)
2> .
ok
----------------------------------------
3> fprof:profile([{file,test.trace}]).
Reading trace data...
..
End of trace!
ok
4> fprof:analyse([{dest,test.analyse}])
4> .
Processing data...
Creating output...
Done!
ok
5>
CNT表示总的函数调用次数，ACC表示Trace起始经历的时间，OWN是Trace中所有函数执行的时间和（不包含调用函数的执行时间），我们这个例子中OWN和ACC比较接近，因为我们这里在启动trace后就立即开始了函数调用，没有进行其他特殊的工作。这里时间的单位为ms。(来自
相关文档
)
1 -module(chat).
2 -compile(export_all).
3 %-behaviour(gen_server).
4 start(N) ->
5 fprof:trace(start,"chat.trace"),
6 start_link(),
7 test(),
8 test(N),
9 testcast(),
10 fprof:trace(stop),
11 fprof:profile(file,"chat.trace"),
12 %fprof:analyse([{dest,"chat.analysis"}]).
13 fprof:analyse([{dest,"chat.analysis"},{callers,true},{sort,own}]),
14 io:format("11111111111~p~n",[whereis(chat)]).
15
16 test(0)->
17 gen_server:call(?MODULE, {test,0});
18 test(N)->
19 gen_server:call(?MODULE, {test,N}),
20 test(N-1).
21 test()->
22 chat ! {test,1}.
23 testcast() ->
24 gen_server:cast(?MODULE,castttt).
25
26 start_link() ->
27 gen_server:start_link({local,?MODULE},?MODULE,[],[]).
28
29 init([]) ->
30 {ok, {}}.
31 handle_cast(Msg,State) ->
32 tttt(),
33 io:format("cast=~p~n",[Msg]),
34 {noreply,State}.
35
36 handle_call({test,Number},From, State) when is_number(Number) ->
37 Reply = Number+1,
1,14 顶端
部分分析结果
1 %% Analysis results:
2 { analysis_options,
3 [{callers, true},
4 {sort, own},
5 {totals, false},
6 {details, true}]}.
7
8 % CNT ACC OWN
9 [{ totals, 110269, 799.622, 736.349}]. %%%
10
11
12 % CNT ACC OWN
13 [{ "<0.33.0>", 110269,undefined, 736.349}]. %%
14
15 {[{{gen,do_call,4}, 10001, 276.089, 159.700}],
16 { {gen,wait_resp_mon,3}, 10001, 276.089, 159.700}, %
17 [{{erlang,demonitor,2}, 10001, 53.116, 53.116},
18 {suspend, 9983, 63.273, 0.000}]}.
19
20 {[{{gen,call,4}, 10001, 499.306, 124.766}],
21 { {gen,do_call,4}, 10001, 499.306, 124.766}, %
22 [{{gen,wait_resp_mon,3}, 10001, 276.089, 159.700},
23 {{erlang,send,3}, 10001, 53.294, 53.294},
24 {{erlang,monitor,2}, 10001, 43.054, 43.054},
25 {garbage_collect, 257, 2.103, 2.103}]}.
26
27 {[{{gen,call,3}, 10001, 617.283, 77.498}],
28 { {gen,call,4}, 10001, 617.283, 77.498}, %
29 [{{gen,do_call,4}, 10001, 499.306, 124.766},
30 {{erlang,whereis,1}, 10001, 40.479, 40.479}]}.
31
32 {[{{chat,test,1}, 10000, 0.000, 72.848},
33 {{chat,start,1}, 1, 798.851, 0.060}],
34 { {chat,test,1}, 10001, 798.851, 72.908}, %
35 [{{chat,test,1}, 10000, 0.000, 72.848},
36 {{gen_server,call,2}, 10001, 725.943, 71.115}]}.
从手册上看到以下三种方式：
4.1 Profiling from the source code