| Author |
Message |
< Erlang ~ Unexpected beam.smp process |
| odi |
 Posted: Fri Sep 09, 2011 11:27 am |
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Joined: 19 Feb 2009
Posts: 9
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Hi,
We've been running an Erlang application on multicore machine and we've noticed that our monitoring tool (atop) sometimes informs that there're multiple instances of beam.smp process (however there should be only one Erlang VM running).
Output from atop:
Quote:
PRG S2 1315467785 2011/09/08 09:43:05 5 32589 (beam.smp) S 0 0 32589 29 0 1315466977 (/home/services/bin/beam.smp -sbt db -P 134217727 -- -root /home/services -progname erl -- -home /root -- -boot ./r) 1 2 26 1 0 0 0 0 0 0 0
PRG S2 1315467785 2011/09/08 09:43:05 5 13225 (beam.smp) D 0 0 13225 1 -2147483648 1315467784 (/home/services/bin/beam.smp -sbt db -P 134217727 -- -root /home/services -progname erl -- -home /root -- -boot ./r) 32589 0 0 1 0 0 0 0 0 0 0
It looks like there're 2 Erlang VMs with the same name, but the second one (PID 13225) is in a D state (uninterruptible sleep) and is a child of the real beam.smp process (PID 32589).
Does anybody know what is the 2nd process? Is it some kind of port or something like that? What else can we check?
P.S. We use OTP R14B01 |
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| rvirding |
| Posted: Sun Sep 18, 2011 9:46 pm |
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Joined: 30 Aug 2006
Posts: 452
Location: Stockholm, Sweden
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| I am not familiar with atop but could these be separate threads within the same process? The beam normally runs at least one thread pre core. |
_________________
Robert Virding, Erlang Solutions Ltd. |
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| odi |
| Posted: Mon Sep 19, 2011 7:19 am |
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Joined: 19 Feb 2009
Posts: 9
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These are certainly system processes forked by beam.smp.
You can try simple program:
Code: -module(spawn).
-export([do/1]).
do(N) ->
PIDs = spawn_do(N, []),
ok = start_do(PIDs, self()),
ok = wait_do(PIDs).
spawn_do(0, PIDs) ->
PIDs;
spawn_do(N, PIDs) ->
PID = spawn_link(fun() ->
receive
{start, PPID} ->
ok
end,
os:cmd("ping -c 1 -W 1 127.0.0.1"),
PPID ! {done, self()}
end),
spawn_do(N - 1, [PID | PIDs]).
start_do([], _PPID) ->
ok;
start_do([PID | PIDs], PPID) ->
PID ! {start, PPID},
start_do(PIDs, PPID).
wait_do([]) ->
io:format("Test finished!~n", []),
ok;
wait_do([PID | PIDs]) ->
receive {done, PID} ->
io:format("~p process is done.~n", [PID])
end,
wait_do(PIDs).
By running it with Quote: [user@arch workspace]$ erl -sname node
Erlang R14B (erts-5.8.1) [source] [64-bit] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.8.1 (abort with ^G)
(node@arch)1> spawn:do(1000). Quote: while [ 1 -eq 1 ]; do ps ax | grep -E "beam|unix" | grep -v "grep"; done | tee spawn_test.log
I suppose that Erlang VM forks child process for the purpose of 'os:cmd/1' and before exec is run, the new beam.smp process is reported by 'ps' with the same name as main Erlang VM process. |
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| NedFrank |
| Posted: Wed Dec 21, 2011 3:14 pm |
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Joined: 21 Dec 2011
Posts: 7
Location: Kansas
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odi wrote: Hi,
We've been running an Erlang application on multicore machine and we've noticed that our monitoring tool (atop) sometimes informs that there're multiple instances of beam.smp process (however there should be only one Erlang VM running).
Can anyone tell me if the corporate blogging software they use is able to be merged with Erlang? I know there's some third-party stuff out there. We want it to look unique, but still be functional and recognizable by visitors. |
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| wuji |
| Posted: Thu Aug 16, 2012 7:29 am |
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Joined: 10 Aug 2012
Posts: 654
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| dongdongwu |
| Posted: Thu Sep 20, 2012 5:24 am |
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Joined: 19 Sep 2012
Posts: 236
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