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parallel B-KEY |
supercomputers I-KEY |
or O |
clusters B-KEY |
of I-KEY |
workstations I-KEY |
is O |
critical O |
to O |
high O |
performance O |
because O |
reductions B-KEY |
are O |
common O |
in O |
scientific O |
codes O |
and O |
a O |
potential O |
source O |
of O |
bottlenecks O |
. O |
Yet O |
in O |
many O |
high-level O |
languages O |
, O |
a O |
mechanism O |
for O |
writing O |
efficient O |
reductions B-KEY |
remains O |
surprisingly O |
absent O |
. O |
Further O |
, O |
when O |
such O |
mechanisms O |
do O |
exist O |
, O |
they O |
often O |
do O |
not O |
provide O |
the O |
flexibility O |
a O |
programmer O |
needs O |
to O |
achieve O |
a O |
desirable O |
level O |
of O |
performance O |
. O |
In O |
this O |
paper O |
, O |
we O |
present O |
a O |
new O |
language B-KEY |
construct I-KEY |
for O |
arbitrary O |
reductions B-KEY |
that O |
lets O |
a O |
programmer O |
achieve O |
a O |
level O |
of O |
performance O |
equal O |
to O |
that O |
achievable O |
with O |
the O |
highly O |
flexible O |
, O |
but O |
low-level O |