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docu: add some notes to shared_work/work_stealing sched-algos

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olk committed Apr 2, 2017
1 parent 47da124 commit 779651736360e1f5736da6499172ed624635fef7
Showing with 4 additions and 11 deletions.
  1. +4 −11 doc/scheduling.qbk
@@ -220,6 +220,9 @@ wakes `suspend_until()` via

[class_heading shared_work]

[note Because of the non-locality of data, ['shared_work] is less performant
than ['work_stealing].]

This class implements __algo__, scheduling fibers in round-robin fashion.
Ready fibers are shared between all instances (running on different threads)
of shared_work, thus the work is distributed equally over all threads.
@@ -304,17 +307,7 @@ wakes `suspend_until()` via
[class_heading work_stealing]

This class implements __algo__; if the local ready-queue runs out of ready
fibers, ready fibers are stolen from other schedulers. The work-stealing
algorithm is based on the Chase-Lev algorithm.[footnote
David Chase and Yossi Lev. Dynamic circular work-stealing deque.
In SPAA [,]05: Proceedings of the seventeenth annual ACM symposium
on Parallelism in algorithms and architectures, pages 21–28,
New York, NY, USA, 2005. ACM.]
[footnote
Nhat Minh Lê, Antoniu Pop, Albert Cohen, and Francesco Zappa Nardelli. 2013.
Correct and efficient work-stealing for weak memory models.
In Proceedings of the 18th ACM SIGPLAN symposium on Principles and practice
of parallel programming (PPoPP [,]13). ACM, New York, NY, USA, 69-80.]
fibers, ready fibers are stolen from other schedulers.
The victim scheduler (from which a ready fiber is stolen) is selected at random.

#include <boost/fiber/algo/work_stealing.hpp>

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