Re: Dual Processor

[Dan Nelson]

In the last episode (Jul 21), sinisa@stripped said:
> Dan Nelson writes:
>  > In the last episode (Jul 20), sinisa@stripped said:
>  > > Regarding your first question, MySQL is fully multi-threaded, as
>  > > you know, so do not run 2 servers, please !!
>  > 
>  > Multi-threaded != multi-processing.  FreeBSD's thread
>  > implementation is user-level, so the entire mysql process would
>  > run on one CPU.
> 
> I must consent my ignorance regarding FreeBSD, but if MySQL runs, and
> it uses threads, then threads are not just user-level.
> 
> Then, it is only up to SMP kernel to distribute processes among CPUs.
> 
> Or do you want to tell me that FreeBSD threading is independent of
> its kernel ????

Yes, I do.  FreeBSD's libc_r threads are managed through the use of
setitimer() and the SIGVTALRM signal, just like MIT pthreads.

	-Dan Nelson
	dnelson@stripped