Ocean is a popular program from the SPLASH-2 parallel benchmark suite. A complete application, as opposed to a computational kernel, Ocean is often used as a representative of a well-tuned parallel program in architectural studies. However, we find there is a danger in using Ocean to evaluate proposed enhancements that purport to either improve scalability or reduce synchronization overhead. The default Ocean code contains an ill-advised code segment that seriously handicaps its "base" performance in common architectural studies. We provide the one-line fix for the offending code that improves performance by as much as a factor of 2.3, and suggest that architecture researchers using Ocean to evaluate their new ideas---especially when discussing scalability or synchronization---change their code immediately.
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Ocean warning: avoid drowning
Heinrich, Mark; Chaudhuri, Mainak
Follow ACM SIGARCH Computer Architecture News
, Volume 31 (3)
Association for Computing Machinery – Jun 1, 2003
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