| Author |
Message |
< Erlang ~ erlang:process_info doesn't seem to work across meshed nodes |
| ptmoy |
 Posted: Tue Mar 15, 2011 7:40 pm |
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User
Joined: 24 Dec 2009
Posts: 10
Location: New Jersey, U.S.A.
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I'm using the test program (test2) shown below. I created a meshed cluster consisting of two nodes (node a & node b - please see below). From node a, I spawned a child process, which waits in a loop to receive messages; I also created a group via pg2, and made the spawned child process a member of this group. I used the "getPid" function from the test program to get the Pid of the only member of the group (i.e., pid of the spawned child process). As you can see below, I can send a message via the Pid (located in node a) from node b as expected. But when I tried to run erlang:process_info on this same pid on the two nodes, it works on node a but not on node b. What am I doing wrong? Also, when I run "getPid" from node b, I always get an exception the first time (see below), then it'll work after that - why is this?
Any help would be appreciated. Thank in advance.
-module(test2).
-export([init/0, getPid/0, receiver/0]).
init()->
pg2:create(t2group),
Pid = spawn (test2, receiver, []),
pg2:join (t2group, Pid).
getPid()->
[MemberPid] = pg2:get_members(t2group),
MemberPid.
receiver() ->
receive
Info ->
io:format ("Received: ~p~n", [Info]),
receiver()
end.
pm@T110:~/projects/test2$ erl -sname a
Erlang R14B01 (erts-5.8.2) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.8.2 (abort with ^G)
(a@T110)1> test2:init().
ok
(a@T110)2> Pid = test2:getPid().
<0.44.0>
Received: "message"
(a@T110)3> erlang:process_info (Pid).
[{current_function,{test2,receiver,0}},
{initial_call,{test2,receiver,0}},
{status,waiting},
{message_queue_len,0},
{messages,[]},
{links,[]},
{dictionary,[]},
{trap_exit,false},
{error_handler,error_handler},
{priority,normal},
{group_leader,<0.31.0>},
{total_heap_size,233},
{heap_size,233},
{stack_size,1},
{reductions,16},
{garbage_collection,[{min_bin_vheap_size,46368},
{min_heap_size,233},
{fullsweep_after,65535},
{minor_gcs,0}]},
{suspending,[]}]
(a@T110)4>
pm@T110:~/projects/test2$ erl -sname b
Erlang R14B01 (erts-5.8.2) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.8.2 (abort with ^G)
(b@T110)1> net_adm:ping(a@T110).
pong
(b@T110)2> Pid = test2:getPid().
** exception error: no match of right hand side value
{error,{no_such_group,t2group}}
in function test2:getPid/0
(b@T110)3> Pid = test2:getPid().
<5916.44.0>
(b@T110)4> Pid ! "message".
"message"
(b@T110)5> erlang:process_info (Pid).
** exception error: bad argument
in function process_info/1
called as process_info(<5916.44.0>)
(b@T110)6> |
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| NedFrank |
| Posted: Wed Dec 21, 2011 3:10 pm |
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Joined: 21 Dec 2011
Posts: 7
Location: Kansas
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Merging like this can create some major headaches. I've been trying to find a way to get some large files into a email database using Outlook. Nothing. We need a manual for this stuff!
_______________________
IT guy for several years, StoredIQ may solve your fears! |
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| dongdongwu |
| Posted: Thu Sep 20, 2012 5:55 am |
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Joined: 19 Sep 2012
Posts: 236
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