Here's what I've found:

| $ while date; do ps afxuw | grep -E "[[:space:]]$(status jujud-machine-0 | awk '{ print $4 }')|RS\\S"; sudo pmap -XX $(status jujud-machine-0 | awk '{ print $4 }') | grep -E 'Rss|[[:space:]][1-9][[:digit:]]{5}'; sleep 600; done
| Wed Nov 30 23:51:47 UTC 2016
| USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
| root     13713 29.0 25.7 1156072 528852 ?      Ssl  22:03  31:35 /var/lib/juju/tools/machine-0/jujud machine --data-dir /var/lib/juju --machine-id 0 --debug
|          Address Perm   Offset Device   Inode    Size    Rss    Pss Shared_Clean Shared_Dirty Private_Clean Private_Dirty Referenced Anonymous AnonHugePages Swap KernelPageSize MMUPageSize Locked                   VmFlagsMapping
|         034a6000 rw-p 030a6000  fd:01 1071550     208    112     95           20            0             4            88        112        88             0    0              4           4      0 rd wr mr mw me dw ac sd  jujud
|       c81f158000 rw-p 00000000  00:00       0  242336 241052 241052            0            0             0        241052     239684    241052          6144    0              4           4      0    rd wr mr mw me ac sd  [stack:13716]
|       c82ea00000 rw-p 00000000  00:00       0  141312 141256 141256            0            0             0        141256     140672    141256         47104    0              4           4      0    rd wr mr mw me ac sd
|                                               1156076 528908 523262         7008            0         10608        511292     526164    511292         59392    0            392         392      0 KB
| ...
| Thu Dec  1 01:31:48 UTC 2016
| USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
| root     13713 29.9 44.9 1593580 922328 ?      Ssl  Nov30  62:23 /var/lib/juju/tools/machine-0/jujud machine --data-dir /var/lib/juju --machine-id 0 --debug
|          Address Perm   Offset Device   Inode    Size    Rss    Pss Shared_Clean Shared_Dirty Private_Clean Private_Dirty Referenced Anonymous AnonHugePages Swap KernelPageSize MMUPageSize Locked                   VmFlagsMapping
|         034a6000 rw-p 030a6000  fd:01 1071550     208    108     95           16            0             4            88        108        88             0    0              4           4      0 rd wr mr mw me dw ac sd  jujud
|       c81e49a000 rw-p 00000000  00:00       0  255384 254112 254112            0            0             0        254112     251616    254112             0    0              4           4      0    rd wr mr mw me ac sd  [stack:13716]
|       c838000000 rw-p 00000000  00:00       0  223232 223232 223232            0            0             0        223232     218328    223232             0    0              4           4      0    rd wr mr mw me ac sd
|       c846a10000 rw-p 00000000  00:00       0  264832 227964 227964            0            0             0        227964     227264    227964             0    0              4           4      0    rd wr mr mw me ac sd
|                                               1593584 922828 917828         6172            0          4340        912316     907352    912316          2048    0            444         444      0 KB

Full output - http://pastebin.ubuntu.com/23560803/

| $ while date; do echo "top10" | go tool pprof 'http://localhost:10000/debug/pprof/heap'; echo ""; sleep 600; done
| Thu Dec  1 11:06:40 AEDT 2016
| Fetching profile from http://localhost:10000/debug/pprof/heap
| Saved profile in /home/hloeung/pprof/pprof.localhost:10000.inuse_objects.inuse_space.008.pb.gz
| Entering interactive mode (type "help" for commands)
| (pprof) 270.67MB of 285.08MB total (94.95%)
| Dropped 707 nodes (cum <= 1.43MB)
| Showing top 10 nodes out of 71 (cum >= 2.50MB)
|       flat  flat%   sum%        cum   cum%
|    86.93MB 30.49% 30.49%   104.93MB 36.81%  github.com/juju/juju/apiserver.(*apiRoot).FindMethod.func1
|    68.01MB 23.86% 54.35%    68.01MB 23.86%  launchpad.net/tomb.(*Tomb).init
|    65.51MB 22.98% 77.33%    65.51MB 22.98%  reflect.Value.call
|       17MB  5.96% 83.29%       17MB  5.96%  github.com/juju/juju/apiserver.newNotifyWatcher
|    10.73MB  3.76% 87.05%    10.73MB  3.76%  crypto/tls.(*block).reserve
|        9MB  3.16% 90.21%        9MB  3.16%  encoding/json.(*decodeState).literalStore
|     7.50MB  2.63% 92.84%     7.50MB  2.63%  runtime.malg
|        3MB  1.05% 93.89%        3MB  1.05%  encoding/json.stateBeginValue
|     1.50MB  0.53% 94.42%     1.50MB  0.53%  runtime.deferproc.func1
|     1.50MB  0.53% 94.95%     2.50MB  0.88%  github.com/juju/juju/state.(*RelationScopeWatcher).loop
| ...
| Thu Dec  1 12:37:06 AEDT 2016
| Fetching profile from http://localhost:10000/debug/pprof/heap
| Saved profile in /home/hloeung/pprof/pprof.localhost:10000.inuse_objects.inuse_space.017.pb.gz
| Entering interactive mode (type "help" for commands)
| (pprof) 541.86MB of 557.76MB total (97.15%)
| Dropped 765 nodes (cum <= 2.79MB)
| Showing top 10 nodes out of 46 (cum >= 11.81MB)
|       flat  flat%   sum%        cum   cum%
|   224.49MB 40.25% 40.25%   254.49MB 45.63%  github.com/juju/juju/apiserver.(*apiRoot).FindMethod.func1
|   125.51MB 22.50% 62.75%   125.51MB 22.50%  launchpad.net/tomb.(*Tomb).init
|   115.51MB 20.71% 83.46%   116.01MB 20.80%  reflect.Value.call
|       29MB  5.20% 88.66%       29MB  5.20%  github.com/juju/juju/apiserver.newNotifyWatcher
|    18.50MB  3.32% 91.98%    18.50MB  3.32%  encoding/json.(*decodeState).literalStore
|    14.84MB  2.66% 94.64%    14.84MB  2.66%  crypto/tls.(*block).reserve
|     7.50MB  1.35% 95.98%     7.50MB  1.35%  runtime.malg
|        5MB   0.9% 96.88%        5MB   0.9%  encoding/json.stateBeginValue
|        1MB  0.18% 97.06%   126.51MB 22.68%  github.com/juju/juju/state.(*docWatcher).loop
|     0.50MB  0.09% 97.15%    11.81MB  2.12%  gopkg.in/mgo%2ev2.(*mongoSocket).readLoop

Again, full output - http://pastebin.ubuntu.com/23560801/