[erlang-questions] eheap cannot allocate for which process?

József Bérces <>
Mon Mar 17 09:51:13 CET 2014


I receive the classic "eheap_alloc: Cannot allocate..." message. It wants to allocate ~1GB memory and that fails. That is fine, I am doing something wrong. So I took the crash dump and tried to find out which one of my processes is the guilty one.

Unfortunately, I cannot tell it from the crash dump.

The memory section says:
=memory
total: 15447352528
processes: 15140232809
processes_used: 15140005610
system: 307119719
atom: 512601
atom_used: 496586
binary: 148574400
code: 21228007
ets: 119988984

I have 16GB RAM, so the processes use almost all. There are 4010 processes. 1 garbing, 31 scheduled, 3978 waiting. If I sum stack+heap of all the processes then I get ~700MB. That is very far from 16GB. Here are the top 10 stack+heap processes:
Pid

State

Reductions

Stack+heap

MsgQ Length

<0.21060.67>

Garbing (limited info)

1,508,838,180

145,962,050

1

<0.25689.27>

Waiting

86,670,344

145,962,050

0

<0.10003.68>

Waiting

1,363,039

38,263,080

0

<0.15943.66>

Waiting

1,882,465,380

30,610,465

0

<0.15879.68>

Waiting

471,549

30,610,465

0

<0.31854.67>

Waiting

154,500,777

24,488,375

0

<0.16221.68>

Waiting

262,114

24,488,375

0

<0.16628.68>

Waiting

117,268

24,488,375

0

<0.15878.68>

Waiting

453,490

19,590,700

0

<0.16235.68>

Waiting

181,968

19,590,700

0


Any ideas how to tell which process needs ~1GB memory?

Thanks,
Jozsef
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