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Add details of fiber pool and coroutine selection to NEWS.

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Samuel Williams 2019-07-01 16:24:39 +12:00
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NEWS
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@ -259,6 +259,19 @@ profile.rb, Profiler__::
=== Implementation improvements === Implementation improvements
Fiber::
* Allow selecting different coroutine implementation by using
`--with-coroutine=`, e.g.
./confgure --with-coroutine=ucontext
./confgure --with-coroutine=copy
* Replace previous stack cache with fiber pool cache. The fiber pool
allocates many stacks in a single memory region. Stack allocation
becomes O(log N) and fiber creation is amortized O(1). Around 10x
performance improvement was measured in micro-benchmarks.
Thread:: Thread::
* VM stack memory allocation is now combined with native thread stack, * VM stack memory allocation is now combined with native thread stack,