On 13 Giu, 15:35, "Mandeville, Rob" <rmandevi...@litle.com> wrote: > Jenkins doesn't recognize "nice" because that's a Unix-only feature; I'm not > sure if there is an equivalent Windows feature. Of course, if your steps are > shells, you can tell those to nice themselves. You could also "nice" your > slave nodes when you launch them, if you do so by script. Niceness is > inherited, so a slave node running at a given nice level will run jobs at > that same nice level. > Jenkins itself tends to be rather light on the CPU, but it takes up > networking resources and disk I/O because it receives output from the jobs it > runs and logs them. Idle slaves are light, and a slave in use only adds a > little overhead, mostly the network traffic of sending logs back to the > server. > When you configure a job, it has an "Execute concurrent builds if necessary" > flag. With that turned on, you can run more than one in parallel. > If you want some jobs to be "nicer" than others on the same machine, you can > use the Jenkins Heavy Job Plugin. Basically, while a normal job takes up one > executor (a node can have one or more executors, each capable of running a > job), a heavy job can take up multiple ones. So if you have job A (an easy > one) and job B (a resource hog), you can tell Jenkins that Job B has a > "weight" of (say) 3. If you had a node with four executors, this would mean: > 1: Job B would not run until there are three free executors, so it would wait > until no more than one copy of job A was running > 2: Job B would take up three executors, so when it was running, Jenkins would > put no more than one copy of job A on that node, and not another version of > job B (to run two job B's on the same node, you'd need at least six > executors). > > Hope this helps, > > --Rob
Hi Rob. Thank you for your exaustive reply. Now I have a better idea of how things work in jenkins. I have a couple of questions. 1) Do you know if the master executor will do the builds in a separate process or inside the same process of the webapp? 2) I just realized we have a number crunching cluster here on a different subnet.. what if I put a few executor there? What about the communication between jenkins the executors? Ports, protocol, ecc.. Thank you again!
