memory usage of Riak.

Alex Feng sweden.feng at gmail.com
Thu Jan 26 05:47:20 EST 2017


Hi Riak Users,

One of my riak nodes, it has 4G memory, when I check the memory usage with
"free -m", I can see there are only around 150M left.  Then I check the
command "riak-admin status", it shows around 415M(415594432) consumed by
Erlang.  But with "top" command, it shows Erlang takes 52.1% memory, it is
about 2G.
So, my question is where is the other ~1.6G (2G - 415M) memory ?


dropped_vnode_requests_total : 0
executing_mappers : 0
gossip_received : 6
handoff_timeouts : 0
ignored_gossip_total : 0
index_fsm_active : 0
index_fsm_create : 0
index_fsm_create_error : 0
late_put_fsm_coordinator_ack : 0
leveldb_read_block_error : 0
list_fsm_active : 0
list_fsm_create : 0
list_fsm_create_error : 0
list_fsm_create_error_total : 0
list_fsm_create_total : 0
map_actor_counts_100 : 0
map_actor_counts_95 : 0
map_actor_counts_99 : 0
map_actor_counts_mean : 0
map_actor_counts_median : 0
mem_allocated : 3859660800
mem_total : 3975495680
memory_atom : 703377
memory_atom_used : 677686
memory_binary : 92813136
memory_code : 16511098
memory_ets : 6823184
memory_processes : 287157280
memory_processes_used : 287149824
memory_system : 128437152
memory_total : 415594432



KiB Swap:  4063228 total,   106496 used,  3956732 free.   296560 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND

    1 riak      20   0 4844692 1.929g   1772 S   5.3 52.1   4539:13
beam.smp
23510 riak      20   0 10.152g 1.131g  32292 S   4.3 30.6   2:07.28 java

   72 riak      20   0    7492     92      0 S   0.0  0.0   0:15.22 epmd

  190 riak      20   0    4440    224    172 S   0.0  0.0   0:00.67 sh

  191 riak      20   0    4324    252    192 S   0.0  0.0   0:08.97 memsup

  193 riak      20   0    4324      0      0 S   0.0  0.0   0:00.00 cpu_sup

  285 riak      20   0    7460     28      0 S   0.0  0.0   0:29.51
inet_gethost
  286 riak      20   0   13780    316    236 S   0.0  0.0   0:55.30
inet_gethost
  287 riak      20   0   13780      8      0 S   0.0  0.0   0:00.00
inet_gethost
22534 root      20   0   22320   1248    756 S   0.0  0.0   0:00.07 bash

24714 root      20   0   23992   1456   1052 R   0.0  0.0   0:00.00 top



Br,
Alex
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