[users at bb.net] RAM consumption of twisted for buildbot 0.8.12?

[Dan Kegel]

What's normal RAM consumption for twisted on buildbot master for 0.8.12?
With 1359 builders, I'm seeing 1.4GB.  If memory use is proportional
to builders, that's 100MB/builder.

Here's the output of top after two days of uptime.  This is steady
state; if someone clicks on the waterfall, CPU spikes to 277%, but ram
doesn't climb.

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1223 buildbot  20   0  2681m 1.4g  4340 D   0 17.7 130:18.76 twistd