[rabbitmq-discuss] OOM kill

[Dmitry Andrianov]

Hello.
We are trying to load-test RabbitMQ server in different configurations 
on Amazon EC2 node.
Most of our tests end with Linux OOM killer intervening and killing Rabbit.
That is something I cannot really understand especially given that it is 
reproducible even with vm_memory_high_watermark set to 0.2 and no other 
processes running on that box.
So if someone could shed some light onto that issue it would help a lot.

Below the status response not long before the process was killed:

  {os,{unix,linux}},
  {erlang_version,
      "Erlang R15B01 (erts-5.9.1) [source] [64-bit] [async-threads:30] 
[kernel-poll:true]\n"},
  {memory,
      [{total,1984625336},
       {connection_procs,1235761240},
       {queue_procs,142935728},
       {plugins,-44730984},
       {other_proc,34065132},
       {mnesia,32001976},
       {mgmt_db,233149752},
       {msg_index,13545296},
       {other_ets,49861192},
       {binary,148478688},
       {code,20404184},
       {atom,793505},
       {other_system,118359627}]},
  {vm_memory_high_watermark,0.2},
  {vm_memory_limit,804643635},
  {disk_free_limit,50000000},
  {disk_free,1843380224},
  {file_descriptors,
      [{total_limit,64900},
       {total_used,11681},
       {sockets_limit,58408},
       {sockets_used,11677}]},
  {processes,[{limit,1048576},{used,198557}]},
  {run_queue,6},
  {uptime,575}]

Couple of strange things there are:

1. {vm_memory_limit,804643635} but still memory {total,1984625336}. How 
is that possible? https://www.rabbitmq.com/memory.html says that erlang 
process can take twice the configured size so I expected that but it is 
definitely more than twice.

2. {plugins,-44730984} - how this one is possible?

And just in cast it is needed, below is /proc/X/status

VmPeak:     2267580 kB
VmSize:     2110952 kB
VmLck:           0 kB
VmHWM:     2096276 kB
VmRSS:     2020848 kB
VmData:     2075168 kB
VmStk:          88 kB
VmExe:        1604 kB
VmLib:        4848 kB
VmPTE:        4304 kB
Threads:    31


Thanks in advance!






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