search for: sched_rr

...ug 2023, Cedric Blancher wrote: >We're experiencing rather very bad latency spikes on busy Linux >systems, for example if one machine is the jumphost (ssh -J) for a few >hundred connections, while at the same time handles CPU intensive >tasks. > >Would RT/Linux SCHED_FIXED or SCHED_RR be of help in such a case, e.g. Did you already check the old and tried method of nice(2)? If the other load is CPU-intensive, this is usually sufficient. Normally you?d nice the CPU-intensive load (so anything else on the system is not affected), but you can also negative-nice the sshd processe...

Good morning! We're experiencing rather very bad latency spikes on busy Linux systems, for example if one machine is the jumphost (ssh -J) for a few hundred connections, while at the same time handles CPU intensive tasks. Would RT/Linux SCHED_FIXED or SCHED_RR be of help in such a case, e.g. put all ssh processes into the SCHED_FIXED scheduling class, with a priority higher than the non-interactive compute processes? Also, do I interpret it correctly that each forwarded TCP connection has its own process?! Ced -- Cedric Blancher <cedric.blancher at...

...;pthread.h> #include <sched.h> #include <errno.h> #include <unistd.h> void * dummy_worker(void *ptr) { printf("Hello from worker\n"); return NULL; } int main(void) { struct sched_param schedule; schedule.sched_priority = 50; if (sched_setscheduler(getpid(), SCHED_RR, &schedule) == 1) { perror("sched_setscheduler"); exit(EXIT_FAILURE); } cpu_set_t cpuset; CPU_ZERO(&cpuset); CPU_SET(1, &cpuset); if (sched_setaffinity(getpid(), sizeof(cpuset), &cpuset) == -1) { perror("sched_setaffinity"); exit(EXIT_FAIL...

Hi I was asking about the fedora 14 kernel if it is good enough for cgroup usage because I am trying to set a cgroup under cpu subsytem ( /dev/cgroup/cpu/group1/ ) that have /cpu.rt_runtime_us of 100000 while cpu.rt_period_us has a value of 1000000 i.e a ratio of 1/10 . still when I run a task (endless loop) in that group (cgexec -g cpu,cpuset:group1 ./test) it gets all the cpu core time

...sk/agi-bin\" -DBUSYDETECT_MARTIN -DNEW_PRI_HANGUP -c -o asterisk.o asterisk.c asterisk.c: In function `set_priority': asterisk.c:377: storage size of `sched' isn't known asterisk.c:384: warning: implicit declaration of function `sched_setscheduler' asterisk.c:384: `SCHED_RR' undeclared (first use in this function) asterisk.c:384: (Each undeclared identifier is reported only once asterisk.c:384: for each function it appears in.) asterisk.c:392: `SCHED_OTHER' undeclared (first use in this function) asterisk.c:377: warning: unused variable `sched' make: *** [...

Dear all, I want to run a process in a container with a real-time (RT) priority. When the sched_setscheduler(0, SCHED_RR, &sparam) is called in the container, an error is reported which is "operation not permitted" I had added the following line in the file /etc/security/limits.conf for both the host and the container, which means allowing all users to change the priority of the process, but it still do...

Dear all, I want to setup a privileged container, which means I can set the priority of a process to SCHED_RR (real-time) dynamically by calling sched_setscheduler() in a C program running on a container. In my system (host: fedora19, container: fedora19, libvirt 1.2.5), my C code reports "operation not permitted" when sched_setscheduler() is called. I found a link (https://www.redhat.com/archive...