[erlang-questions] gen_server message queue length increasing

Allen Kim <>
Thu Nov 3 22:21:31 CET 2011


from my limited knowledge, it seems your delete_by_pid/1 is waiting for
something.

Allen




On 11-11-03 5:15 PM, "Zvi" <> wrote:

>I forgot to mention, that we use R14B04 with HiPE disabled and Kernel
>Poll enabled.
>OS is Ubuntu 11.10.
>
>On Nov 3, 11:14 pm, Zvi <> wrote:
>> Hi,
>>
>> I have a locally registered gen_server [1], which traping exits and
>> monitoring list of processes (which saved in ETS table in it's state).
>> The priority of this gen_server set to high.
>> We also use fullsweep_after = 0.
>> The only job of this gen_server is to spawn gen_servers of other type
>> and update ETS table with their pids.
>> The priority of a spawned gen_server process is normal.
>>
>> For some reason the message queue length of this gen_server start
>> increasing, whith messages which supposedly should processed by
>> gen_server:handle_info/2 [2].
>> Any ideas?
>>
>> [2]
>>
>> ()9> whereis(myserver).
>> <0.194.0>
>> ()10> i(0,194,0).
>> [{registered_name,myserver},
>>  {current_function,{proc_lib,sync_wait,2}},
>>  {initial_call,{proc_lib,init_p,5}},
>>  {status,waiting},
>>  {message_queue_len,43388},
>>  {messages,[{'EXIT',<0.17263.1>,normal},
>>             {'DOWN',#Ref<0.0.220.23782>,process,<0.17263.1>,normal},
>>             {'EXIT',<0.19870.0>,normal},
>>             {'DOWN',#Ref<0.0.7.128134>,process,<0.19870.0>,normal},
>>             {'EXIT',<0.19945.0>,normal},
>>             {'DOWN',#Ref<0.0.7.183474>,process,<0.19945.0>,normal},
>>             {'EXIT',<0.19927.0>,normal},
>>             {'DOWN',#Ref<0.0.7.166242>,process,<0.19927.0>,normal},
>>             {'EXIT',<0.19847.0>,normal},
>>             {'DOWN',#Ref<0.0.7.119123>,process,<0.19847.0>,normal},
>>             {'EXIT',<0.19935.0>,normal},
>>             {'DOWN',#Ref<0.0.7.174779>,process,<0.19935.0>,normal},
>>             {'EXIT',<0.17267.1>,normal},
>>             {'DOWN',#Ref<0.0.220.24915>,process,<0.17267.1>,normal},
>>             {'EXIT',<0.19833.0>,normal},
>>             {'DOWN',#Ref<0.0.7.109092>,process,<0.19833.0>,normal},
>>             {'EXIT',<0.19895.0>,normal},
>>             {'DOWN',#Ref<0.0.7.135024>,process,...},
>>             {'EXIT',<0.19906.0>,...},
>>             {'DOWN',...},
>>             {...}|...]},
>>  {links,[<0.14463.0>,<0.1452.1>,<0.28537.1>,<0.6041.2>,
>>          <0.11523.2>,<0.13320.2>,<0.13691.2>,<0.14031.2>,<0.14312.2>,
>>          <0.14363.2>,<0.14502.2>,<0.14514.2>,<0.14518.2>,<0.14523.2>,
>>          <0.14516.2>,<0.14509.2>,<0.14512.2>,<0.14506.2>,<0.14471.2>,
>>          <0.14490.2>|...]},
>>  {dictionary,[{'$ancestors',[router_core_sup,router_sup,
>>                              <0.189.0>]},
>>               {'$initial_call',{myserver,init,1}}]},
>>  {trap_exit,true},
>>  {error_handler,error_handler},
>>  {priority,high},
>>  {group_leader,<0.188.0>},
>>  {total_heap_size,1346269},
>>  {heap_size,1346269},
>>  {stack_size,26},
>>  {reductions,3818768},
>>  {garbage_collection,[{min_bin_vheap_size,46368},
>>                       {min_heap_size,233},
>>                       {fullsweep_after,0},
>>                       {minor_gcs,0}]},
>>  {suspending,[]}]
>>
>> --------------------------------------
>>
>> [1]
>>
>> -module(myserver).
>> -behaviour(gen_server).
>>
>> ...
>>
>> handle_info({'EXIT', Pid, _}, State) ->
>>         delete_by_pid(Pid, State),
>>     {noreply, State};
>>
>> handle_info({'DOWN', _, process, Pid, _}, State) ->
>>         delete_by_pid(Pid, State),
>>     {noreply, State};
>>
>> handle_info(Info, State) ->
>>     {stop, {unknown_info, Info}, State}.
>> _______________________________________________
>> erlang-questions mailing list
>> 
>>://erlang.org/mailman/listinfo/erlang-ques
>>tions
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