Yes, thank you. I have been reading this document since before it was merged.
I know that usability for me is currently zero, but I am interested in technology and development. I have one unused DDR4 stick from notebook upgrade, but the J5005 seems like no good choice as by datasheet the L2 cache is shared across all cores. (So I guess memory infighting would occur.) C. Dne středa 6. března 2019 13:04:06 UTC+1 John Morris napsal(a): > > Bas is right. Here's the referenced documentation in context. > > http:// <http://www.machinekit.io/docs/hal/threads-and-latency/> > www.machinekit.io <http://www.machinekit.io/docs/hal/threads-and-latency/> > /docs/ <http://www.machinekit.io/docs/hal/threads-and-latency/>hal > <http://www.machinekit.io/docs/hal/threads-and-latency/>/ > <http://www.machinekit.io/docs/hal/threads-and-latency/>threads- > <http://www.machinekit.io/docs/hal/threads-and-latency/>and-latency > <http://www.machinekit.io/docs/hal/threads-and-latency/>/ > <http://www.machinekit.io/docs/hal/threads-and-latency/> > > If you have no CPUs to spare, though, this will be of no use to you. > > John Morris > Dovetail Automata *LLC* > > > > From: Bas de Bruijn > Sent: Thursday, February 28, 13:43 > Subject: [Machinekit] cgroups and isolating CPU’s > To: ce...@tuta.io > Cc: Machinekit > > > So as not to hijack the thread, a new thread > > On 28 Feb 2019, at 19:20, ce...@tuta.io wrote: > > BTW, did someone else (than Zultron) try to use the core isolation feature > to "turn on" back the step signal generation in software? My electrotrash > which I use for Machinekitdoes not have cores to spare. > > > Yes, you’re probably referring to this? > https <https://github.com/machinekit/machinekit/pull/1426>:// > <https://github.com/machinekit/machinekit/pull/1426>github.com > <https://github.com/machinekit/machinekit/pull/1426>/ > <https://github.com/machinekit/machinekit/pull/1426>machinekit > <https://github.com/machinekit/machinekit/pull/1426>/ > <https://github.com/machinekit/machinekit/pull/1426>machinekit > <https://github.com/machinekit/machinekit/pull/1426>/pull/1426 > <https://github.com/machinekit/machinekit/pull/1426> > > Although i dont use software step generation. The latency obtained is very > good (6-7 us). > > What was done here is to force the thread to run on designated cpu’s. > Because these cpu’s were isolated during startup (isolcpus= kernel > parameter) there are no other processes running on these cpu’s. > These cpu’s must be the pair that share their L2 cache, or hyperthreading > should be disabled and that cpu used. > > A setup that was historically used with iolcpus= kernel parameters was to > run everything on 1 cpu (disabling all but one), so that the cpu was hogged > and that got good latency results. > > This cgroups setup is the other way around, you’ll only run HAL on the > isolated cpu’s, the /RT cpuset. > > I’m no expert on this so there might be some more clarification needed > from the experts :) > > Bas > -- > website: http:// <http://www.machinekit.io>www.machinekit.io blog: http:// > <http://blog.machinekit.io>blog.machinekit.io github: https > <https://github.com/machinekit>:// <https://github.com/machinekit> > github.com <https://github.com/machinekit>/ > <https://github.com/machinekit>machinekit <https://github.com/machinekit> > --- > You received this message because you are subscribed to the Google Groups > "Machinekit" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to machinekit+unsub...@googlegroups.com. > Visit this group at https <https://groups.google.com/group/machinekit>:// > <https://groups.google.com/group/machinekit>groups.google.com > <https://groups.google.com/group/machinekit>/group/ > <https://groups.google.com/group/machinekit>machinekit > <https://groups.google.com/group/machinekit>. > For more options, visit https <https://groups.google.com/d/optout>:// > <https://groups.google.com/d/optout>groups.google.com > <https://groups.google.com/d/optout>/d/ > <https://groups.google.com/d/optout>optout > <https://groups.google.com/d/optout>. > > > -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to machinekit+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/machinekit. For more options, visit https://groups.google.com/d/optout.
