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Update README with differentiation from STREAM

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Tom Deakin 2020-06-02 15:41:00 +01:00
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README.md
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@ -21,6 +21,23 @@ Currently implemented are:
This code was previously called GPU-STREAM.
How is this different to STREAM?
--------------------------------
BabelStream implements the four main kernels of the STREAM benchmark (along with a dot product), but by utilising different programming models expands the platforms which the code can run beyond CPUs.
The key differences from STREAM are that:
* the arrays are allocated on the heap
* the problem size is unknown at compile time
* wider platform and programming model support
With stack arrays of known size at compile time, the compiler is able to align data and issue optimal instructions (such as non-temporal stores, remove peel/remainder vectorisation loops, etc.).
But this information is not typically available in real HPC codes today, where the problem size is read from the user at runtime.
BabelStream therefore provides a measure of what memory bandwidth performance can be attained (by a particular programming model) if you follow today's best parallel programming best practice.
Website
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[uob-hpc.github.io/BabelStream/](https://uob-hpc.github.io/BabelStream/)