スレッドの同時実行レベルを変更するん何を？

Question

私はpthread_setconcurrency()のmanページを読んで、それが「並行処理レベル」によって何を意味するのか見当がつかないました。それは単に曖昧な用語です。同時実行レベルがスケジューリングポリシーに&プロセスの優先順位を変更する変更しますか？それは他の何かをしますか？ manual page on Linuxから

Answer 1

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NOTES 
     The default concurrency level is 0. 

     Concurrency levels are only meaningful for M:N threading implementations, where at any moment a subset of a process's set of user-level threads 
     may be bound to a smaller number of kernel-scheduling entities. Setting the concurrency level allows the application to give the system a hint as 
     to the number of kernel-scheduling entities that should be provided for efficient execution of the application. 

     Both LinuxThreads and NPTL are 1:1 threading implementations, so setting the concurrency level has no meaning. In other words, on Linux these 
     functions merely exist for compatibility with other systems, and they have no effect on the execution of a program.