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License: GNU General Public License v3.0
o A simulation of context switching for uni-processor and assigning processes using round-robin scheme. A context switch is the process of storing and restoring the state of a process or thread so that execution can be resumed from the same point at a later time. Little micro-benchmarks to assess the performance overhead of context switching. timesyscall: Benchmarks the overhead of a system call. timectxsw: Benchmarks the overhead of context switching between 2 processes. timetctxsw: Benchmarks the overhead of context switching between 2 threads. timectxswws: Benchmarks the overhead of context switching between 2 processes using a working set of the size specified in argument. timetctxsw2: Benchmarks the overhead of context switching between 2 threads, by using a shed_yield() method. If you do taskset -a 1, all threads should be scheduled on the same processor, so you are really doing thread context switch. Then to be sure that you are really doing it, just do: strace -ff -tt -v taskset -a 1 ./timetctxsw2 Now why sched_yield() is enough for testing ? Because, it place the current thread at the end of the ready queue. So the next ready thread will be scheduled. I also added sched_setscheduler(SCHED_FIFO) to get the best performances.
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