On Mon, 27 Dec 1999, Richard Seaman, Jr. wrote:
> On Mon, Dec 27, 1999 at 10:30:54AM -0800, Kip Macy wrote:
> > They may be preemptive, but I saw a lot of instances with Lyris where one
> > thread could easily monopolize processor time at the expense of all
> > others and I had to add sleeps in at places.
>
> Is this recently, or a while ago? FreeBSD user threads used to use
> SIGVTALRM for its pre-emption signal. This didn't count time in
> syscalls. So, if you had a syscall (eg I/O) intensive thread, it
> would hog processor time. I think that has been changed.
Yes, we use SIGPROF now.
Dan Eischen
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