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editing, removed some binaries
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Peter Bakkum committed Feb 16, 2012
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This is an experimental heterogeneous SQL database written to compare data
processing on the CPU and NVIDIA GPUs. It was written by Peter Bakkum
during the summer of 2010 at NEC Laboratories America in Princeton, New Jersey
during the summer of 2010 at NEC Laboratories America in Princeton
with several subsequent expansions. It shares no code with any other database
system. A thanks goes to the [Systems Architecture group at
NEC](http://www.nec-labs.com/research/system/systems_arch-website/index.php),
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This research is more about the organization of the database than the query
running times, since they depend on many factors and are somewhat specific to
the workload I have focused on. Please read my note about the results below.
The results are for brute force SELECT queries that with conditions and math
The results are for brute force SELECT queries with conditions and math
operations.

On the machines I have tested with, GPU execution is __2x - 5x__ faster than
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faster than the CPU. Speedup depends on the query, number of data records,
number of result records, and the specific test hardware. Your mileage may vary.

Here are some performance charts that compare running times of a 10 SQL query
Here are some performance charts that compare running times of a 10 query
suite on the CPU and two GPU execution techniques. The mapped configuration is
applicable to arbitrary data sizes, while the cached configuration applies only
for data sizes that fit within the GPU's global memory.
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