sigar reports same mem_size and mem_resident for all processes on Mac

As suggested by Trond, opening a ticket for this. Trond, don't know if 3rd-party is the right component for this. Leaving it to you to set it appropriately.

ns_server collects systems stats from portsigar. I noticed that on my Mac, stats.log was reporting same mem resident and mem size for all processes. Added some diagnostics to verify that it is coming from portsigar.
Since the sigar code is platform specific, I quickly checked cluster run logs on my Windows box and it does not show the same behavior (at least as of Aug 10 code). So, looks like something Mac specific (and possibly some other OS aswell).

{processes_stats,$
[

{<<"godu/680/ppid">>,667}

,$

{<<"godu/680/mem_size">>,2557276160}

,$

{<<"godu/680/mem_resident">>,2809856}

,$

{<<"godu/680/cpu_utilization">>,0}

,$

{<<"godu/680/major_faults_raw">>,0}

,$

{<<"cbq-engine/707/ppid">>,706}

,$

{<<"cbq-engine/707/mem_size">>,2557276160}

,$

{<<"cbq-engine/707/mem_resident">>,2809856}

,$

{<<"cbq-engine/707/cpu_utilization">>,0}

,$

{<<"cbq-engine/707/major_faults_raw">>,0}

,$

{<<"indexer/703/ppid">>,702}

,$

{<<"indexer/703/mem_size">>,2557276160}

,$

{<<"indexer/703/mem_resident">>,2809856}

,$

{<<"indexer/703/cpu_utilization">>,0}

,$

{<<"indexer/703/major_faults_raw">>,0}

,$

{<<"projector/701/ppid">>,700}

,$

{<<"projector/701/mem_size">>,2557276160}

,$

{<<"projector/701/mem_resident">>,2809856}

,$

{<<"projector/701/cpu_utilization">>,0}

,$

{<<"projector/701/major_faults_raw">>,0}

,$

Poonam