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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 |