Difference between revisions of "Allreduce"
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In this case all processes will perform the reduction on ''p'' and all processes will have the minimum value of ''p'' placed into their copy of ''x''. | In this case all processes will perform the reduction on ''p'' and all processes will have the minimum value of ''p'' placed into their copy of ''x''. | ||
+ | == Supported operations == | ||
+ | |||
+ | {{ Template:ReductionOperations }} | ||
[[Category:Type Library]] | [[Category:Type Library]] | ||
[[Category:Composite Types]] | [[Category:Composite Types]] | ||
[[Category:Primitive Communication Types]] | [[Category:Primitive Communication Types]] |
Revision as of 17:30, 12 January 2013
Syntax
allreduce[operation]
Semantics
Similar to the reduce type, but the reduction will be performed on each process and the result is also available to all.
Example
var x:Int::allocated[multiple[]]; var p; par p from 0 to 3 { (x::allreduce["min"]):=p; };
In this case all processes will perform the reduction on p and all processes will have the minimum value of p placed into their copy of x.
Supported operations
Operator | Description |
---|---|
max | Identify the maximum value |
min | Identify the minimum value |
sum | Sum all the values together |
prod | Generate product of all values |