Avi Kivity 784e03aa31 thread: use setjmp/longjmp for context switches ...

swapcontext() is expensive as it invokes system calls.  Replace it with
setjmp()/longjmp().  We still use setcontext() initially, since that's
the most reasonable portable method of setting up a stack.

Context switch time (measured by thread_context_switch) is reduced to
120ns (from 450ns), with inefficiencies in the test itself and in future<>
dominating.

2015-05-17 17:22:48 +03:00

3.0 KiB

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