Add "qmemory" command

[kennyhei]

Shows the following info for each cluster:

• Cluster ID
• State
• Uptime
• Available memory (MB)
• Available memory (%)
• Total memory (MB)
• Memory usage of each worker (MB)

Also tracks lowest available memory (%) with a timestamp. And has the same bottom blue bar info as in qmonitor (Queued/Successful/Failed tasks).

Not exactly sure if all the info is necessary or if I should add something more. I myself was interested in memory related info, uptime, number of queued tasks and which cluster was in question.

[kennyhei]

Now that I think about it, I would leave out "State", "Uptime" and that bottom blue bar info (since you can just have a separate terminal with qmonitor on it) and add "Host".

Also maybe sentinel, monitor and pusher memory usage? That would be interesting but I'll wait for feedback.

[Koed00]

I agree with you on the bottom blue bar - it would make it a bit more compact.
I would be interested in the sentinel, monitor and pusher memory. Except maybe the pusher, they shouldn't change much over time though.

[kennyhei]

Redesigned the qmemory info as follows:

• Host
• (Cluster) ID
• Available memory (%)
• Available memory (MB)
• Total memory (MB)
• Sentinel (MB)
• Monitor (MB)
• Workers (MB)

Optional argument --workers shows each worker's memory usage:

• (Cluster) ID
• Worker 1 (MB) ... Worker N (MB)

[Koed00]

Very nice. Give me a few days before I can actually pull this and have a look again.