On the Parallelization of Stream Compaction on a Low-Cost SDC Cluster

Algorithm 3

Parallel work-efficient stream compaction.

	Input: Vector I of length n
	Input: Predicate function F
	Input: Number of processes p
	Input: pid of process
	Output: Vector O of valid elements
	Output: nvalid: the number of valid elements
(1)
(2)
(3)
(4)
(5)	for to in parallel do
(6)	if then
(7)
(8)
(9)	end if
(10)	end for
(11)	if then
(12)	Send to process pid 0
(13)	end if
(14)	if then
(15)	for to do
(16)
(17)
(18)	end for
(19)	for to do
(20)	Send to process pid i
(21)	end for
(22)
(23)	end if
(24)	if then
(25)	Receive
(26)	end if
(27)
(28)	for to in parallel do
(29)
(30)	end for
(31)	for to in parallel do
(32)	if then
(33)
(34)	end if
(35)	end for