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The computing performance today is developing mainly using parallelizedsequential computing, in many forms. The paper scrutinizes whether theperformance of that type of computing has an upper limit. The simpleconsiderations point out that the theoretically possible upper bound ispractically achieved, and that the main obstacle to step further is thepresently used computing paradigm and implementation technology. In addition tothe former "walls", also the "performance wall" must be considered. As thepaper points out, similarly to the "dark silicon", also the "dark performance"is always present in the parallelized many-processor systems.

The performance wall of parallelized sequential computing: the dark performance and the roofline of performance gain