Hello Romeu,

virtual memory is not the real used memory of the system. You should
better consider the RSS of the application. Here is an example of an
instance running on OpenWrt.

~# cat /proc/5207/status
Name:   dtnd
State:  S (sleeping)
Tgid:   5207
Pid:    5207
PPid:   5164
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 32
Groups:
VmPeak:    40684 kB
VmSize:    40684 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:      3720 kB
VmRSS:      3720 kB
VmData:    33928 kB
VmStk:       136 kB
VmExe:      1528 kB
VmLib:      4680 kB
VmPTE:        48 kB
VmSwap:        0 kB
Threads:        17
SigQ:   0/988
SigPnd: 00000000000000000000000000000000
ShdPnd: 00000000000000000000000000000000
SigBlk: 00000000000000000000000000001000
SigIgn: 00000000000000000000000000000000
SigCgt: 0000000000000000000000018001c007
CapInh: 0000000000000000
CapPrm: ffffffffffffffff
CapEff: ffffffffffffffff
CapBnd: ffffffffffffffff
Cpus_allowed:   1
Cpus_allowed_list:      0
voluntary_ctxt_switches:        1
nonvoluntary_ctxt_switches:     30


The VmRSS is below 4 MB in this case. If you own set-up memory usage
increases too much, you can consider to disable features with a high
memory usage or even disable them during compilation.

At this point, I like to mention that DTN agents need to hold a lot of
state to forward bundles correctly. Additional libraries and complex
routing protocols increase the need. Thus, it depends on your specific
scenario if you can deal with low memory devices or not.

Kind regards,
Johannes


Am 28.05.2014 15:47, schrieb Romeu Monteiro:

>
> We are testing IBR-DTN in a vehicular testbed with On Board Units of
> limited resources and we have seen that IBR-DTN uses little CPU (around
> 2/3%) but a lot of virtual memory (from 84% to 140%, for instance). An
> example:
>
> Mem: 45096K used, 16084K free, 0K shrd, 412K buff, 19996K cached
> CPU:   2% usr   4% sys   0% nic  92% idle   0% io   0% irq   0% sirq
> Load average: 0.15 0.12 0.13 2/87 21145
>   PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
>  1090     1 root     S    61148 107%  2% dtnd -c /etc/ibrdtnd_rsu.conf
>
> We have seen IBR-DTN (dtnd) use around 59MB of RAM from a total of
> 128MB, which is a lot for our devices. We are trying to mitigate this
> problem.
>
> Do you have any idea of what might be causing IBR-DTN to use so much
> memory and if we can do something to reduce this usage, or is this just
> the way it goes and there's little or nothing we can do about it?

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