[erlang-questions] Memory usage

Ulf Wiger <>
Tue Sep 9 22:29:54 CEST 2008


Hi Francesca,

It sounds a bit similar to this:

http://www.erlangatwork.com/2008/07/hunting-bugs.html

In that case, xmerl was used, and was happily gobbling up memory
(now, that was a 64-bit system, which of course aggravated the problem.
OTOH the XML bits were fairly small.)

BR,
Ulf W

2008/9/9 Francesca Gangemi <>:
> Hi,
>
> we notice that nodes crash during a load test because they cannot
> allocate more memory.
> The slogan from the crash dump says
> "eheap_alloc: Cannot allocate 3328160 bytes of memory (of type old_heap")."
>
> Memory information reports the following values
> total              2468460696
> processes     2060871072
> processes_used     2060858920
> system              407589624
>
> If then I look at the process information and I add up the Stack+heap
> values for all the processes I get 243183460 bytes. This number is quite
> less than the processes_used one.
> I wonder if something else is added up to the process_used memory value.
>
> We run the test using R11B-3 and R12B-4.
> There are 6000 processes running under a supervisor. They generate xml
> requests and parse xml responses. The XML structure is quite complex and
> its size is up to 80KB.
>
> The following lines report information about allocated areas
>
> sys_misc     3422757
> static     14417920
> atom_space     163860    162413
> atom_table     91901
> module_table     5768
> export_table     48008
> register_table     852
> fun_table     3250
> module_refs     4096
> loaded_code     4553244
> dist_table     555
> node_table     299
> bits_bufs_size     0
> bif_timer     40604
> link_lh     0
> proc     3995708    3988028
> atom_entry     316564    316276
> export_entry     312364    312172
> module_entry     12088    11888
> reg_proc     6320    6104
> monitor_sh     253288    252248
> nlink_sh     362060    358844
> proc_list     28    28
> fun_entry     60724    60220
> db_tab     12848    10416
> driver_event_data_state     28    28
> driver_select_data_state     1000    328
>
>
> Kind regards
> Francesca
>
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