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I benchmarked mpiBLAST but I don see super-linear speedup! Why?!

benchmarked mpiblast speedup
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I benchmarked mpiBLAST but I don see super-linear speedup! Why?!

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mpiBLAST only yields super-linear speedup when the database being searched is significantly larger than the core memory on an individual node. The super-linear speedup results published in the ClusterWorld 2003 paper describing mpiBLAST are measurements of mpiBLAST v0.9 searching a 1.2GB (compressed) database on a cluster where each node has 640MB of RAM. A single node search results in heavy disk I/O and a long search time.

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