[erlang-questions] help about process,why very slow.
Sean Hinde
sean.hinde@REDACTED
Sun Feb 17 14:19:18 CET 2008
Hi,
Why do you think the CPU should be anything other than 100% when you
have just sent 1000000 messages into the system. It is of course busy
processing the messages.
Sean
On 17 Feb 2008, at 13:03, 瞄瞄 wrote:
> hi!
> I checked the server found in erlang shell activated when launched
> smp, my server is single core, smp cancelled after the running of
> the entire service soon, but still high cpu occupiers, the test data
> will be 1000000 continuing seconds cpu 99% usage, may I ask you what
> optimization approach? Cpu occupiers will be reduced?
>
> thanks All!
>
> 2008/2/17 myname iserl <mynameiserl@REDACTED>:
> Hi,
>
> Sorry, for offlist.
> I don't use erlang yet and I don't really know erlang at all,
> but I read the list often.
>
> For monitoring why your server is using 99% you might try:
> http://www.erlang.org/documentation/doc-5.2/lib/observer-0.9/doc/html/etop_ug.html
> http://www.erlang.org/doc/efficiency_guide/profiling.html
>
> http://www.erlang.org/doc/man/eprof.html
> http://www.erlang.org/doc/man/fprof.html
> http://www.erlang.org/doc/apps/tools/cprof_chapter.html
>
> Good luck
>
> 瞄瞄 wrote:
> > 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 <http://127.0.0.1/>,100
> million
> > run by 40 seconds, and even in the server 127.0.0.1 <http://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 <sean.hinde@REDACTED <mailto:sean.hinde@REDACTED
> >>:
> >
> > 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 <icejmx@REDACTED
> > <mailto:icejmx@REDACTED>> wrote:
> > > server code url
> > > http://icej.80s.net.cn/emssserver.erl
> > >
> > > On Sat, Feb 16, 2008 at 11:26 AM, 瞄瞄 <icejmx@REDACTED
> > <mailto:icejmx@REDACTED>> 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.
> > >
> > >
> > >
> > >
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