> Reading a file from disk, waiting for network I/O, etc are all catastrophically slow in CPU time and having a mechanism to keep a thread doing useful other wo

> Reading a file from disk, waiting for network I/O, etc are all catastrophically slow in CPU time and having a mechanism to keep a thread doing useful other work is important. curious if you have benchmarks of "catastrofically slow". Also, on linux, mainstream implementation translates async calls to blocked logic with thread pool on kernel level anyway.