mnesia_tm process memory high watermark

Serge Aleynikov <>
Tue May 23 22:35:23 CEST 2006


In a production system running mnesia database with in-memory replicas 
we noticed through OS_MON that mnesia_tm process was eating a lot of 
memory as illustrated below.  Is there a recommendation on how to ensure 
that mnesia_tm is automatically garbage collected periodically to keep 
the process memory overhead manageable?

Is the proper way to handle this to call 
erlang:system_flag(fullsweep_after, Number) or there's a better approach?

Serge

()4> process_info(pid(0,63,0)).
[{registered_name,mnesia_tm},
  {current_function,{mnesia_tm,doit_loop,1}},
  {initial_call,{proc_lib,init_p,5}},
  {status,waiting},
  {message_queue_len,0},
  {messages,[]},
  {links,[<0.58.0>]},
  {dictionary,[{'$ancestors',[mnesia_kernel_sup,mnesia_sup,<0.55.0>]},
               {'$initial_call',{mnesia_sp,
                                    init_proc,
 
[mnesia_tm,mnesia_tm,init,[<0.58.0>]]}}]},
  {trap_exit,true},
  {error_handler,error_handler},
  {priority,normal},
  {group_leader,<0.54.0>},
  {heap_size,24488375},
  {stack_size,20},
  {reductions,21411651},
  {garbage_collection,[{fullsweep_after,65535}]}]

()5> process_info(pid(0,63,0), memory).
{memory,138075680}
()6> erlang:garbage_collect(pid(0,63,0)).
true
()7> process_info(pid(0,63,0), memory).
{memory,1352}



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