Increased memory usage by Zeek..

Hi All,

Couple of months ago I upgraded the Zeek cluster from 2.5 to 2.6.1
(compiled with the jemalloc support).
I have started seeing increased memory usage by the workers.

I have two physical sensors, each running 18 Zeek worker processes LB by
PF_RING.
Not loaded any custom scripts, just the basic scripts that are enabled by
default in local.bro (also have misc/scan disabled).

I just did a top on one of the boxes and here's the output (specially two
Zeek processes -*13632, **13611* using >10% memory which is ~11G)
Also, attaching a weekly available free memory graph for the system.

Tasks: 455 total,   9 running, 443 sleeping,   0 stopped,   3 zombie
%Cpu(s): 18.3 us,  1.7 sy,  0.0 ni, 79.5 id,  0.0 wa,  0.0 hi,  0.4 si,
 0.0 st
KiB Mem : 98783960 total, 32963660 free, *64807572* used,  1012728
buff/cache
KiB Swap:  4194300 total,  3572200 free,   622100 used. 33221356 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
13589 bro       20   0 3662052   3.4g  73340 R    90.4     3.6    1072:47
  /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-5 local.bro broctl base/frameworks/cluster broctl/auto
13533 bro       20   0 1847972   1.6g  73188 S    50.3     1.7    1098:05
  /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-6 local.bro broctl base/frameworks/cluster broctl/auto
13512 bro       20   0 1291260   1.1g  73052 S    49.7     1.1    1080:30
  /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-1 local.bro broctl base/frameworks/cluster broctl/auto
13628 bro       20   0 2347952   2.1g  73328 R    49.0     2.2    1109:31
  /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-12 local.bro broctl base/frameworks/cluster broctl/auto
13516 bro       20   0  973260 799176  72844 R  47.0     0.8    1036:29
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-3 local.bro broctl base/frameworks/cluster broctl/auto
13539 bro       20   0 6374956   6.0g  73456 S    46.0     6.3    1147:08
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-2 local.bro broctl base/frameworks/cluster broctl/auto
13591 bro       20   0  865952 726516  73020 S  44.7     0.7    1052:29
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-4 local.bro broctl base/frameworks/cluster broctl/auto
*13632* *bro       20   0   12.2g  12.0g  73584 R      43.7  *  *12.8*
1068:17   /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p
broctl-live -p local -p worker-2-15 local.bro broctl
base/frameworks/cluster broctl/auto
13540 bro       20   0 2146844   1.9g  73348 R    41.4     2.0    1149:38
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-7 local.bro broctl base/frameworks/cluster broctl/auto
*13611* bro       *20   0   17.0g  16.7g  73404 S      39.7*    *17.8*
1172:14   /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p
broctl-live -p local -p worker-2-9 local.bro broctl base/frameworks/cluster
broctl/auto
13640 bro       20   0 2624300   2.1g  73328 S    39.7     2.3    1043:50
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-18 local.bro broctl base/frameworks/cluster broctl/auto
13586 bro       20   0 3347044   3.1g  73468 S    39.1     3.2    1042:24
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-10 local.bro broctl base/frameworks/cluster broctl/auto
13641 bro       20   0 2274788   2.0g  73424 R    39.1     2.2    1029:58
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-17 local.bro broctl base/frameworks/cluster broctl/auto
13614 bro       20   0 1954780   1.7g  73188 S    38.4     1.8   995:00.54
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-13 local.bro broctl base/frameworks/cluster broctl/auto
13627 bro       20   0 2756520   2.5g  73288 S    38.4     2.6     1035:18
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-14 local.bro broctl base/frameworks/cluster broctl/auto
13638 bro       20   0 1206548 853056  72328 R  37.4    0.9   952:10.00
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-16 local.bro broctl base/frameworks/cluster broctl/auto
13623 bro       20   0 8998324   2.1g  73284 S     37.1    2.2     1073:31
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-11 local.bro broctl base/frameworks/cluster broctl/auto
13575 bro       20   0  871396 706148  73128 R    36.4   0.7     1028:30
 /usr/local/bro/2.6.1/bin/bro -i p3p1 -U .status -p broctl -p broctl-live
-p local -p worker-2-8 local.bro broctl base/frameworks/cluster broctl/auto
13336 bro       20   0  266244 133920  33388 S    12.6   0.1   400:27.62
 /usr/local/bro/2.6.1/bin/bro -U .status -p broctl -p broctl-live -p local
-p proxy-2 local.bro broctl base/frameworks/cluster broctl/auto

Any suggestions?

Thanks!
Fatema

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