interpreting RAM usage

[sebastianelsner]

I have trouble imtepreting the different RAM fields when querying the /rendernodes resource.

There is systemFreeRam (int), ramSize (int), usedRAM (empty list), freeRam (which never changes)

[sebastianelsner]

I finally ended up changing the worker code, which reports the ram usage, to use psutls instead of parsing the output of /proc/mem.
If there is interest I can submit a pull request for OpenRenderManagement

[samson-jerome]

ramSize: amount of RAM available on the host (in MB)
systemFreeRam: amount of free memory on the host, evaluated periodically (in MB)
systemSwapPercentage: percentage of swap memory on the host, evaluated periodically (in range [0,1])

the other attributes: usedRAM/freeRam are deprecated. They were introduced when a worker was able to run several commands at a time. This capability was eventually removed because of the lack of confidence on the proper execution of every command and ram use.

[samson-jerome]

Ok for the pull request, it could be interesting to have all "system" calls going through psutils.

[sebastianelsner]

Using psutils will improve on potential windows compatibility, too.