BlackGnomeГуестГоспода, дайте ссылочку на любой ресурс с раскрытым сабжем
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http://stackoverflow.com/questions/28888719/multi-threaded-c-program-much-slow-in-os-x-than-linux

авторMacOSX and Linux implement pthread differently, causing this slow behavior. Specifically MacOSX does not use spinlocks (they are optional according to ISO C standard). This can lead to very, very slow code performance with examples like this one.

авторHowever, on the MAC OS, a execution is only given a 'time slice' to execute, before another 'ready to execute' thread/process is allowed to execute.

This means many many more context switches.

Context switches are performed in 'sys' time.

The result is the MAC OS will take much longer to execute.