[erlang-questions] Fwd: process_info

satoshi kinoshita <>
Mon Feb 24 02:56:55 CET 2014


I forgot to reply to the list.

---------- Forwarded message ----------
From: satoshi kinoshita <>
Date: Mon, Feb 24, 2014 at 10:53 AM
Subject: Re: [erlang-questions] process_info
To: Sverker Eriksson <>





On Fri, Feb 21, 2014 at 8:00 PM, Sverker Eriksson <
> wrote:

>  A process has two heaps, one "old" heap with long lived data and a "new"
> heap with more recently created data.
>
> 'heap_size' shows only the size of the new heap.
> Newer releases (my git repo goes back to R13B03) contain
> a 'total_heap_size' that also include the old heap.
>
> /Sverker, Erlang/OTP
>
>
Thanks. I checked the same process running on R15B
and confirmed that total_heap_size is  matching very good with 'memory'
size.

thank you very much,
kinoshita



> On 02/21/2014 07:14 AM, satoshi kinoshita wrote:
>
> 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.
>
>
>
>
> _______________________________________________
> erlang-questions mailing ://erlang.org/mailman/listinfo/erlang-questions
>
>
>
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