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2024-05-23
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2024-05-22
Editing HPL benchmarks (9 nodes)
The 9 nodes are the server (Pentium IV) and the 8 newest nodes (Celerons). The mpich library and executables are ssh-based, icc-compiled. Initial tests : * [[icc, mpich, gcc-made cblas]] * [[icc, mpich, intel math kernel library]] * [[gcc 2.95.3, atlas 3.6.0 local compilation]] The last one was based on atlas 3.6.0 compiled on one of the celeron nodes (aspera), and it looks reasonably good (reaching 8.2 Gflops). Optimisation : * [[Block size (constant problem size)]] best seems to be NB=100. Stick to that. * [[Broadcasts (constant N, NB)]] <nowiki>BlongM</nowiki> (BCAST=5) looks best. Stick to that. * [[re-refine block size with constant BCAST]] : NB=40 or 60 ? * [[NB 40 or 60, swapping threshold 40 or 60]], Ok stick to NB=60, swapping threshold 60. * [[NBmin]] 8 looks better * [[Look-ahead depth]] set to 0 * [[Final test with respect to problem size]] Top speed 9.5 Gflops [[Final HPL 9-node benchmark]], best performance 10.32 Gflops.
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