这是一个简单而著名的测试脚本：

-module(processes).
-compile(export_all).

max(N)->
    Max=erlang:system_info(process_limit),
    io:format("the max processes is ~p ~n",[Max]),
    statistics(runtime),
    statistics(wall_clock),
    L=for(1,N,fun()->spawn(fun()->wait() end) end),
    {_,Time1}=statistics(runtime),
    {_,Time2}=statistics(wall_clock),
    lists:foreach(fun(Pid)->Pid!die end,L),
    U1=Time1*1000/N,
    U2=Time2*1000/N,
    io:format("the proecess time is ~p:~p ~n",[U1,U2]).

wait()->
    receive
        die->void
    end.

for(N,N,F)->[F()];
for(I,N,F)->[F()|for(I+1,N,F)].

main([])->
    max(100000).

下面是erl的输出：

$ erl 
Erlang/OTP 17 [erts-6.2] [source] [64-bit] [smp:2:2] [async-threads:10] [kernel-poll:false]

Eshell V6.2  (abort with ^G)
1> c(processes)
1> processes:max(100000).
* 2: syntax error before: processes
1> c(processes).         
{ok,processes}
2> processes:max(100000).
the max processes is 262144 
the proecess time is 1.1:4.35 
ok

下面是escript的输出：

$ escript processes.erl
the max processes is 262144 
the proecess time is 47.8:83.4

escript和erl到底有什么区别？我是erlang的新手，请帮帮忙！

编辑：

当escript运行射束文件时，它输出与erl相同的结果：

$ escript processes.beam
the max processes is 262144 
the proecess time is 1.8:3.33

发生了什么？我知道 *.beam是编译代码，但是escript在运行它之前没有编译脚本？我还是很困惑。