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    <div class="moz-cite-prefix">I want to stress that:<br>
      NO, we don't use 40 MB for internal structures.<br>
      <br>
      By internal structure size we mean the size of the C struct for
      implementing the process (in 17.0-rc1 this is 792 bytes).<br>
      In erlang:process_info(Pid, memory) we also include the size all
      heap-fragments, typically messages received that are not yet in
      any of the two "real" heaps.<br>
      <br>
      // Björn-Egil, Erlang/OTP<br>
      <br>
      On 2014-02-21 12:00, Sverker Eriksson wrote:<br>
    </div>
    <blockquote cite="mid:530731BB.3070304@erix.ericsson.se" type="cite">
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      <div class="moz-cite-prefix">A process has two heaps, one "old"
        heap with long lived data and a "new" heap with more recently
        created data.<br>
        <br>
        'heap_size' shows only the size of the new heap.<br>
        Newer releases (my git repo goes back to R13B03) contain<br>
        a 'total_heap_size' that also include the old heap.<br>
        <br>
        /Sverker, Erlang/OTP<br>
        <br>
        <br>
        On 02/21/2014 07:14 AM, satoshi kinoshita wrote:<br>
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      <blockquote
cite="mid:CAEPwyWBQJQsuUArj=JRgu4s62XhJ1K7-UMTgALeaKLxjSvqZ4g@mail.gmail.com"
        type="cite">
        <pre wrap="">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

-------------------------------------------------------
(hss1@excast01)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}]}]
(hss1@excast01)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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