Excellent work Michael, good to know how it's done. Though, I have a suspicion that when /proc/meminfo and /proc/cpuinfo don't match other constraints some applications might make incorrect decisions. No facts, just a gut feeling.
Lonnie > On May 24, 2020, at 5:10 PM, Michael Keuter <li...@mksolutions.info> wrote: > > > >> Am 24.05.2020 um 23:54 schrieb Michael Keuter <li...@mksolutions.info>: >> >> >> >>> Am 24.05.2020 um 23:38 schrieb Michael Keuter <li...@mksolutions.info>: >>> >>> >>> >>>> Am 24.05.2020 um 23:24 schrieb Lonnie Abelbeck <li...@lonnie.abelbeck.com>: >>>> >>>> >>>> >>>>> On May 24, 2020, at 3:49 PM, Michael Keuter <li...@mksolutions.info> >>>>> wrote: >>>>> >>>>> Try running the "yes" stresstest in the container, with the above >>>>> limitations. >>>> >>>> If I define lxc.cgroup.cpuset.cpus to 1, or 2 or 3, the "yes" stress-test >>>> [1] only uses one core. >>>> >>>> Setting lxc.cgroup.cpuset.cpus=4 the container does not start. >>>> >>>> Not setting lxc.cgroup.cpuset.cpus all 4 cores are used. >>>> >>>> Lonnie >>>> >>>> [1] >>>> (start test) >>>> # for x in 1 2 3 4; do ( yes >/dev/null & ); done >>>> >>>> (stop test) >>>> # killall yes >>> >>> ---- >>> From the man page: >>> >>> lxc-cgroup -n foo cpuset.cpus "0,3" >>> assign the processors 0 and 3 to the container. >>> ---- >>> >>> I guess you define which CPU cores are allowed to use (0-3), that's why 4 >>> does not work :-). >>> >>> lxc.cgroup.cpuset.cpus=0,3 (maybe in quotes, should use core 1 and 4) >> >> Yup, this uses CPU 2 + 4 (core 0 + 3), you define the actual cores NOT the >> count! >> >> lxc.cgroup.cpuset.cpus = 1,3 > > The RAM limit seems also be working fine. I set this in the container config: > > lxc.cgroup.memory.limit_in_bytes = 256M > > For the test you need to install the "pv" command to see the actual RAM value: > > ---- > root@deb10:# dd if=/dev/zero bs=1024 | pv -b -B 1024 | dd of=/dev/shm/fill > bs=1024 > > dd: error writing '/dev/shm/fill': Cannot allocate memory > 240MiB > 246721+0 records in > 246720+0 records out > 252641280 bytes (253 MB, 241 MiB) copied, 4.63373 s, 54.5 MB/s > ---- > > Sometimes the container crashes at the end of that test. > > Michael > > http://www.mksolutions.info > > > > > > _______________________________________________ > Astlinux-users mailing list > Astlinux-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to > pay...@krisk.org. _______________________________________________ Astlinux-users mailing list Astlinux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to pay...@krisk.org.
