- Name
-
sleep_spin_usec - Default
-
0 - Scope
- per-process
Sets the duration in microseconds of sleep after each spin iteration. Currently applies to EPOLL3 epoll_wait only. Enabling the option trades some of the benefits of spinning - latency - for reduction in CPU utilization and power consumption.
Spinning typically reduces latency and jitter substantially, and can also improve throughput. However, in some applications spinning can harm performance; particularly application that have many threads. When spinning is enabled you should normally dedicate a CPU core to each thread that spins.
You can use the EF_*_SPIN options to selectively enable or disable spinning for each API and transport. You can also use the onload_thread_set_spin() extension API to control spinning on a per-thread and per-API basis.