The first step in the assessment of the performance of a parallel computer system is to measure the performance of a single logical processor of the multi-processor system. There exist already many good and well-established benchmarks for this purpose, notably the LINPACK benchmarks and the Livermore Loops. These are not part of the PARKBENCH suite of programs, but PARKBENCH recommends that these be used to measure single-processor performance, in addition to some specific low-level measurements of its own (see subsection 3.2). There follows a brief description of existing benchmarks that are recommended for measuring single-processor performance, with a discussion of their value.