Re: bitcoin auto-renice-ing

``` Re: bitcoin auto-renice-ing March 15, 2010, 06:44:12 PM

It sets different priorities for each thread. The generate threads run at PRIO_MIN. The other threads rarely take any CPU and run at normal.

#define THREAD_PRIORITY_LOWEST PRIO_MIN #define THREAD_PRIORITY_BELOW_NORMAL 2 #define THREAD_PRIORITY_NORMAL 0

The priorities converted from Windows priorities were probably from a table like this:

“The following table shows the mapping between nice values and Win32 priorities. Refer to the Win32 documentation for SetThreadPriority() for more information on Win32 priority issues.

nice value Win32 Priority -20 to -16 THREAD_PRIORITY_HIGHEST -15 to -6 THREAD_PRIORITY_ABOVE_NORMAL -5 to +4 THREAD_PRIORITY_NORMAL +5 to +14 THREAD_PRIORITY_BELOW_NORMAL +15 to +19 THREAD_PRIORITY_LOWEST”

If you have better values, suggestions welcome.

Also, there was some advice on the web that PRIO_PROCESS is used on Linux because threads are processes. If that’s not true, maybe it accounts for unexpectedly setting the priority of the whole app.

// threads are processes on linux, so PRIO_PROCESS affects just the one thread
setpriority(PRIO_PROCESS, getpid(), nPriority);
```