Benchmark Collection

A collection for different irregular benchmarks.

Including:

GAPBS: gaps GAP Benchmark Suite (Commit 0fb6a472)
HPCG: hpcg-3.1 High Performance Conjugate Gradient Benchmark (Revision 3.1)
NPB: NPB3.3.1 NAS Parallel Benchmark (Version 3.3)
HMS: home-make-serial serial implements for some kernels
VLDB13: vldb13-eth-hashjoin-master VLDB'13 hashjoin obtained