[erlang-questions] process_info

satoshi kinoshita <>
Fri Feb 21 07:14:25 CET 2014


Hi,

I have a question about process_info().

For process <0,477,0> below,
heap_size is 6765 words,
stack_size is 12 words and
memory is 40,149,752 bytes.

Erlang doc says 'memory' includes stack, heap and internal structures.
In this case, stack + heap is 4*(6765+12)=27,108 bytes.

Does this mean most of memory usage(about 40M bytes) are used
for "internal structures"?

What is "internal structures"???

(I'm still using R11B-5 and I don't know it's specific to R11B-5 or not.)


Thanks in advance,
Kinoshita

-------------------------------------------------------
()3> process_info(pid(0,477,0)).
[{registered_name,mgs_db_mgse},
 {current_function,{gen_server,loop,6}},
 {initial_call,{proc_lib,init_p,5}},
 {status,waiting},
 {message_queue_len,0},
 {messages,[]},
 {links,[<0.436.0>]},
 {dictionary,[{'$ancestors',[mgs_db_sup,<0.435.0>]},
              {'$initial_call',{gen,init_it,
                                    [gen_server,
                                     <0.436.0>,
                                     <0.436.0>,
                                     {local,mgs_db_mgse},
                                     mgs_db_mgse,
                                     [60,0,"mgsen-i+up"],
                                     []]}}]},
 {trap_exit,false},
 {error_handler,error_handler},
 {priority,normal},
 {group_leader,<0.434.0>},
 {heap_size,6765},
 {stack_size,12},
 {reductions,237536590},
 {garbage_collection,[{fullsweep_after,65535}]}]
()4> process_info(pid(0,477,0),memory).
{memory,40149752}

---http://www.erlang.org/documentation/doc-5.5.5/lib/kernel-2.11.5/doc/html/erlang.html--------------

 {heap_size, Size}
    Size is the heap size of the process in words.

 {stack_size, Size}
    Size is the stack size of the process in words.

 {memory, Size}
    Size is the size of the process in bytes. This includes call
stack, heap and internal structures.
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