Re:PID Controller for controlling the number of servers in a...
by se4u on Monday July 05, 2021 @09:40PM
(#27743443)
Hi OP here.
To answer why PID, basically somebody I follow asked this question on twitter, and I thought yeah why not seems like a reasonable thing to try :)
Actually I do conclude that PID is not quite the right thing for this problem. For me the learnings from making a PID sort of work for this problem were:
1. must use the right error function. like frequency not time.
2. must use shrinkage on the error to handle discrete number of server.
3. have to run controller at a multiple of server delay to avoid perturbations.
Also I discuss the basic assumptions that a PID controller makes that are suboptimal in the video.
To answer why PID, basically somebody I follow asked this question on twitter, and I thought yeah why not seems like a reasonable thing to try :)
Actually I do conclude that PID is not quite the right thing for this problem. For me the learnings from making a PID sort of work for this problem were:
1. must use the right error function. like frequency not time. 2. must use shrinkage on the error to handle discrete number of server. 3. have to run controller at a multiple of server delay to avoid perturbations.
Also I discuss the basic assumptions that a PID controller makes that are suboptimal in the video.