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Fix #4734 rtapi_app: Assign highest number CPU if no isolated CPU was found #4735

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Merged
grandixximo merged 1 commit into from
Oct 30, 2026
Merged

Fix #4734 rtapi_app: Assign highest number CPU if no isolated CPU was found #4735

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18 changes: 17 additions & 1 deletion src/rtapi/uspace_rtapi_app.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -258,8 +258,24 @@ int RtapiApp::find_rt_cpu_number() {
top = i;
}
if (top == -1) {
//Fallback: If no isolated CPU's found
//use the highest CPU available
CPU_ZERO(&cpuset);
if (sched_getaffinity(0, sizeof(cpuset), &cpuset) == -1) {
rtapi_print_msg(RTAPI_MSG_ERR, "sched_getaffinity failed %m\n");
top = 0; //Fallback, use CPU 0
} else {
for (int i = 0; i < CPU_SETSIZE; i++) {
if (CPU_ISSET(i, &cpuset))
top = i;
}
if (top == -1) {
top = 0; //Fallback, use CPU 0
}
}
rtapi_print_msg(
RTAPI_MSG_ERR, "No isolated CPU's found, expect some latency or set RTAPI_CPU_NUMBER to select CPU\n"
RTAPI_MSG_ERR, "No isolated CPU's found, expect some latency or set RTAPI_CPU_NUMBER to select CPU.\n"
" CPU %i selected as fallback.\n", top
);
}
return top;
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