We have a need to create real time threads in some of our processes
and I've been unable to configure an LXC container to support this.
One reference I came across was to set a container's real time
bandwidth via the lxc.cgroup.cpu.rt_runtime_us parameter in its config
file:
lxc.utsname = test01
lxc.include = /var/lib/lxc/centos.conf
lxc.network.veth.pair = test01
lxc.network.hwaddr = fe:d6:e8:e2:fa:db
lxc.rootfs = /var/lib/lxc/test01/rootfs
lxc.rootfs.backend = dir
lxc.cgroup.cpuset.cpus = 0,1
lxc.cgroup.memory.limit_in_bytes = 2097152000
lxc.cgroup.memory.memsw.limit_in_bytes = 3170893824
lxc.cgroup.cpu.rt_runtime_us = 475000
This container starts up fine if lxc.cgroup.cpu.rt_runtime_us is 0
(zero). Anything other than 0 is rejected, which means real time
threads cannot be created in this container.
What am I missing to get this to work? I am using lxc version 2.0.6
under CentOS 7.2. The container is being created using a custom CentOS
7.2 image.
No takers on this? I assume this is possible? I'm looking for the
configuration options that would allow code such as this to run :
pthread_attr_setinheritsched(&tattr, PTHREAD_EXPLICIT_SCHED);
pthread_attr_setschedpolicy(&tattr, SCHED_FIFO);
tsparam.sched_priority = sched_get_priority_max(SCHED_FIFO) - 7;
pthread_attr_setschedparam(&tattr, &tsparam);
rc = pthread_create(&test_thread, &tattr, test, NULL);
While this code runs fine in my host, it returns a non-zero code on my
containers, indicating I am not allowed to create real time threads. I'm
assuming this is a configuration issue in my LXC containers since I've
seen this same code run under other container frameworks. There doesn't
seem to be a lot of hits on this topic though when it comes to LXC.
Peter
_______________________________________________
lxc-users mailing list
[email protected]
http://lists.linuxcontainers.org/listinfo/lxc-users
