[erlang-questions] help about process,why very slow.

瞄瞄 <>
Sat Feb 16 16:31:56 CET 2008


thanks!
I was revised to {active,once} and server cpu still occupy 99%, but my code
in the local tests, use  127.0.0.1,100 million run by 40 seconds, and even
in the server 127.0.0.1 of the cpu will be 99%.

Is there any way to find out whether there is a server cpu 99%?

very thanks!

2008/2/16 Sean Hinde <>:

> The problem here is almost certainly your use of {active, true}. The
> inbound mailbox will rapidly fill with a very large number of messages
> (1 million in your case), and this can cause the emulator to slow down
> during garbage collection.
>
> You need to introduce some flow control. The {active,once} socket
> option is normally used for this.
>
> Sean
>
> On 16 Feb 2008, at 12:18, 瞄瞄 wrote:
>
> > help!
> >
> > On Feb 16, 2008 11:32 AM, 瞄瞄 <> wrote:
> > server code url
> > http://icej.80s.net.cn/emssserver.erl
> >
> > On Sat, Feb 16, 2008 at 11:26 AM, 瞄瞄 <> wrote:
> >
> > Hello everyone! I recent study erlang familiar with the code to make a
> > message transmitted server, have a problem!
> >
> > I development of the information transmitted server function:
> > Aclient Bclient are connected to Server, and joined a group C, Aclient
> > send message to group C , message will be transmitted to B by group C.
> > SOCKET use the binary (active true), (2) packet.
> >
> > News Server design:
> > Have a process responsible for monitoring all client even when the
> > client connect server, another process (group_manager process)
> > maintenance division List of members of the client group, each group
> > (group process) to have an process within the group responsible for
> > the
> > client to transmit message.
> >
> >
> > Performance testing problems encountered by:
> > A test of million sent to the SERVER message used on the finished
> > eight
> > seconds, and automatic logoff, and the content of the message are the
> > same, so, the test Lan network.
> > SERVER through tcpdump monitor and indeed also in the eight seconds
> > are
> > all the message at the end, and not from the message into the A,
> > however
> > SERVER transmitted to the messages with for a very long time, over 10
> > minutes, finally, I end of the process.
> >
> > In server,use top,the cpu is 99% by beam.smp.
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 31586 root 17 0 70564 18m 1868 S 99.9 0.9 15:46.12 beam.smp
> >
> > Is it a problem I designed a very slow ? Or as a result of the process
> > of communication? What measures can be taken tuning?
> >
> > Thank you help!
> >
> > the server code
> > # -module(emssserver).
> > # -export([init/0]).
> > # -define(TCP_OPTIONS,[binary,{packet, 2}, {active, true}, {reuseaddr,
> > true}]).
> > # -define(PORT,7000).
> > # -define(Debug,"YES").
> > #
> > # -ifdef(Debug).
> > # -define(DEBUG(Fmt, Args), io:format(Fmt, Args)).
> > # -else.
> > # -define(DEBUG(Fmt, Args), no_debug).
> > # -endif.
> > # -record(group,{name,gpid}).
> > # -record(client, {name,pid,socket}).
> > #
> > # init()->
> > # {ok, Listen} = gen_tcp:listen(?PORT, ?TCP_OPTIONS),
> > # register(accept_connection, spawn(fun() -> accept_connection(Listen)
> > end)),
> > # register(group_manage, spawn(fun() -> group_manage([]) end)).
> > #
> > # accept_connection(Listen) ->%% listen new client connection
> > # {ok, Socket} = gen_tcp:accept(Listen),
> > # Pid = spawn(fun() -> client_recv(Socket,"","") end),
> > # gen_tcp:controlling_process(Socket,Pid),
> > # accept_connection(Listen).
> > #
> > # client_recv(Socket,ClientName,GroupPid)->%%client process recv
> > # receive
> > # {tcp, Socket, Bin} ->
> > # ?DEBUG("Server recv Data\r\n",""),
> > # case binary_to_term(Bin) of
> > # {join,JoinName,ClientNameTmp}->%%client join
> > # ?DEBUG("client_recv Join:~s ~s\r\n",[JoinName,ClientNameTmp]),
> > # G=#group{name=JoinName},
> > # group_manage ! {join,G,self()},%%get group pid
> > # receive
> > # {grouppid,GPid}->%%recv group pid
> > # ?DEBUG("Client_recv grouppid ~w ~s\r\n",[GPid,ClientNameTmp]),
> > # GPid!{join,Socket,ClientNameTmp,self()} %% send "join" msg to group
> > # end,
> > # client_recv(Socket,ClientNameTmp,GPid);
> > # {send,GroupName,Msg}->%%send msg to group
> > # ?DEBUG("client_recv Send:~s ~s\r\n",[GroupName,Msg]),
> > # GroupPid!{send,ClientName,Msg},
> > # client_recv(Socket,ClientName,GroupPid)
> > # end;
> > # {tcp_closed, Socket} ->
> > # ?DEBUG("client_recv close\r\n",[])
> > # end.
> > #
> > # group_manage(Group)->%%manage group member
> > # ?DEBUG("group_manage start\r\n",[]),
> > # receive
> > # {join,JoinGroup,ClientPid}->
> > # ?DEBUG("group_manage Join:~s\r\n",[JoinGroup#group.name]),
> > # case lists:keysearch(JoinGroup#group.name, #group.name, Group) of
> > # false ->
> > # Pid=spawn(fun() -> group([]) end),
> > # ?DEBUG("group_manage group pid~w\r\n",[Pid]),
> > # ClientPid!{grouppid,Pid},%%return client_recv group pid
> > # JoinGroupp = #group{name=JoinGroup#group.name,gpid=Pid},
> > # Gs = [JoinGroupp|Group],
> > # ?DEBUG("group_manage group:~w\r\n",[Gs]),
> > # group_manage(Gs);
> > # {value,SingleGroup} ->
> > # ?DEBUG("group_manage group is set ~s\r\n",[SingleGroup#group.name]),
> > # ClientPid!{grouppid,SingleGroup#group.gpid},
> > # group_manage(Group)
> > # end
> > #
> > # end.
> > #
> > # group(Client)->%%send msg to all
> > # ?DEBUG("group \r\n",[]),
> > # receive
> > # {join,Socket,ClientName,CPid} ->
> > # ?DEBUG("group ClientName ~s\r\n",[ClientName]),
> > # ?DEBUG("group Client set ~w\r\n",[Client]),
> > # case lists:keysearch(ClientName,#client.name,Client) of
> > # false->
> > # ?DEBUG("group new client\r\n",[]),
> > # ClientNew = #client{name=ClientName,pid=CPid,socket=Socket},
> > # ClientTmp = [ClientNew|Client],
> > # group(ClientTmp);
> > # {value,SingleClient}->
> > # ?DEBUG("group client is set ~s\r\n",[SingleClient#client.name]),
> > # group(Client)
> > # end;
> > # {send,ClientName,Msg}->
> > # ?DEBUG("group recv client send ~s\r\n",[Msg]),
> > # lists:foreach(fun(T)->send(ClientName,T,Msg) end,Client),
> > # group(Client)
> > # end,
> > # ok.
> > #
> > # send(FClientName,TClientName,Msg)->
> > # if
> > # FClientName /= TClientName#client.name ->
> > # ?DEBUG("send f:~s t:~s
> > ~s\r\n",[FClientName,TClientName#client.name,Msg]),
> > # M = {FClientName,Msg},
> > # gen_tcp:send(TClientName#client.socket,term_to_binary(M));
> > # true->
> > # ?DEBUG("send from eq to\r\n",[])
> > # end.
> >
> > the client code is "gen_tcp:send",iterative
> >
> > the code install three linux server.
> >
> >
> >
> >
> > --
> > 关注:erlang,python,php,java
> > ---------------------------------------------
> > 工作室博客
> > http://blog.80s.net.cn
> >
> >
> >
> > --
> > 关注:erlang,python,php,java
> > ---------------------------------------------
> > 工作室博客
> > http://blog.80s.net.cn
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://www.erlang.org/mailman/listinfo/erlang-questions
>
>


-- 
关注:erlang,python,php,java
---------------------------------------------
工作室博客
http://blog.80s.net.cn
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20080216/ba6a8395/attachment.html>


More information about the erlang-questions mailing list