(sorry for late answer, been on vacation) > When you say "virtual environments" what do you mean? > > With "containers" or Solaris zones you have a very lightweight virtualized > runtime environment where each container uses teh same OS kernel, with > separation being really just a chroot combined with a cgroup. Performance > tuning is no different than a native environment. > > With a hypervisor setup (Xen, Virtual Box, etc) you have the coarse-grained > Xen scheduler taking the place of the OS scheduler. This is great mainstream > technology. Electronic trading is not a mainstream use case. It shouldn't be > a surprise that a mainstream platform doesn't fit a low latency use case.
It’s a hypervisor setup and I agree with you totally, I just have no say in the matter. I was not consulted before we moved to virtual and I have even less influence now. /Erik > > My two cents. > > Peter > > > > > > On Tuesday, March 28, 2017 at 8:46:03 AM UTC-4, Erik Svensson wrote: > Howdy guys! > > My journey into mystification with virtual environments continues. > > We have a number of market data feeds from a number of markets. Each market > feed is running on its own virtual host. > I’m keeping an eye of gc logs and such. > One thing I noticed after a while is that kernel time seems to grow over > time, eventually exceeding user time. If you reboot the machine it goes back > to ‘normal’ and then starts over again. > I have never seen this behaviour with physical hw. > > Does this ring a bell with anyone? Right now I’m thinking about rebooting the > virtual hosts every weekend but that is an unsatisfactory solution. > > cheers > Erik > > -- > You received this message because you are subscribed to the Google Groups > "mechanical-sympathy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- You received this message because you are subscribed to the Google Groups "mechanical-sympathy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
