On Mon, Apr 30, 2018 at 01:02:56AM -0300, Elias M. Mariani wrote: > Hi Anton, > The why is: > An increase in performance. > In this case I want to use some cores to do a very large operation and > it will be faster if the same core continues the same operation. > Maybe there's a library for doing so, or a way that I dont know in OpenBSD. > Now, this cases come not very often, and is debatible (probably > already debated in this proyect) that if that's the case you should > run a variation of the scheduler or use other OS. > And is true... > Now, in this moment I see a lot of activity around vmd/vmm, I have > been using it myself, is great, I love it, but my guess is that you > can get more performance on the guests OS if you set the affinity of > the process.
vmd(8) CPU affinity should bethe absolute least of your concerns WRT vmm/vmd performance. There has been basically zero effort to optimize this area yet. -ml > Maybe this is already done, or may will be... If that's the case > either you added functionality to the OS for supporting affinity or > you made vmm part of the OS, and there is the back question. > If you add vmm as part of the OS you are "extending" the system duty > to be a host, if you add affinity support you are doing the same... > Anyways, the proyect clearly knows itself and if there is no affinity > support is OK. Still loving OpenBSD. > The low punch would be discuss about "nice" support, but lets leave > that aside, I dont want a fight like in other post about philosophy > and low punches. > > Now in MY PARTICULAR CASE, I usually do large math calculations, I've > been using other OSes but I love OpenBSD, so I ported my most used > tool, spyder (for writing python). > I love to test algorithms and things for a large time and things like > that. That is my taste, and is not an obligation for OpenBSD to > support affinity just because I want (Its obvious), but I see lots of > applications for "user level programs", for example vmm, pf, and > others components, I dont know if PF and VMM are "user level > programs", if they are you are already doing things that might be seen > as "not OS duty", if they are not, they would benefit probably of > affinity. > > Just my opinion, again, dont do of this remarks something that it is not... > I just kindly ask about a funcionality, because I want to use my > favorite OS, made right, and test algorithms and look for big prime > numbers on it. If there is no funcionality, then, Its my problem... > Elias. > > 2018-04-29 23:15 GMT-03:00 <li...@wrant.com>: > > Sun, 29 Apr 2018 22:07:18 -0300 "Elias M. Mariani" > > <marianiel...@gmail.com> > >> Hi, > >> I was trying to port mprime to OpenBSD. > >> The main issue is not finding any way to set affinity on cores. > >> Searching for how to do this on OpenBSD bring this result in undeadly: > >> http://undeadly.org/cgi?action=article&sid=20090324210236 > >> > >> Is CPU Affinity dropped out of OpenBSD for some reason? > >> > >> Elias. > >> > > > > Hi Elias, > > > > Why do you want to do the operating system duty in user level programs? > > > > Kind regards, > > Anton Lazarov >
