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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>
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<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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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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