ylib

erlang工具

ylib_flame

生成火焰图工具，注意性能影响，生产环境慎用 可以对单个函数的执行，或者运行中的进程进行分析，

函数分析 ylib_flame:apply({M, F, A}).

ylib_flame:apply({io, format, ["~3p", [123456]]})

%% 进程分析 ylib_flame:start([RuningPid]).

ylib_flame:start([code_server]).
code:add_path(".").
ylib_flame:stop().

执行成功后，会提示：
writing:Your/Path/stacks_XXX.out, Count
run script to dump svg
./stack_to_flame.sh Your/Path/stacks_XXX.out
安装了perl直接执行即可

demo

%% demo.erl
t() ->
    trace函数
    ylib_flame:apply({?MODULE, run_once, []}),
    %% trace运行中进程
    {ok, Server} = demo:start_link(),
    Pid = erlang:spawn(?MODULE, run_loop, [Server]),
    ylib_flame:start([Pid,Server]),
    timer:sleep(500),
    ylib_flame:stop(),
    Pid ! stop,
    ok.

demo:t()

其它

灰色部分为调用gen_server:call的等待时间

ylib_opts

用于解析选项参数

%% demo.es  
main(Args) ->  
    io:format("~p~n", [ylib_opts:parse_opts(Args, #{auto_opt=>true})]),  
    ok.

调用时

escript demo.es "./www","/tmp","--url", "192.168.0.5","8080","192.168.0.6","8081","-u","admin" ,"--passwd","abcd"   

$> #{"--default" => ["./www","/tmp"],
"--passwd" => ["abcd"],
"--url" => ["192.168.0.5","8080","192.168.0.6","8081"],
"-u" => ["admin"]}

直接使用

1> ylib_opts:parse_opts(["./www","/tmp","--url", "192.168.0.5","8080","192.168.0.6","8081","-u","admin" ,"--passwd","abcd"],
[{"--url", [{str,int}]}, {"-u", str}, {"--passwd", str}]).

#{"--default" => ["./www","/tmp"],
"--passwd" => "abcd",
"--url" => [{"192.168.0.5",8080},{"192.168.0.6",8081}],
"-u" => "admin"}

如果加上 atom_key => true，则所有key会去掉"-"或者"--"并转为atom。

#{default => ["./www","/tmp"],
passwd => "abcd",u => "admin",
url => [{"192.168.0.5",8080},{"192.168.0.6",8081}]}