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Performance measurements were taken using std::chrono::highresolution_clock, with overhead corrections. The code was compiled with gcc-6.3.1, using build options: variant = release, optimization = speed. Tests were executed on dual Intel XEON E5 2620v4 2.2GHz, 16C/32T, 64GB RAM, running Linux (x86_64).

Table 1.1. Performance of context switch

using fcontext_t

using ucontext_t

26 ns / 56 CPU cycles

542 ns / 1146 CPU cycles