[ale] threads and apache

[stephen]

On Fri, Oct 11, 2002 at 10:52:42AM -0400, Michael D. Hirsch wrote:
> On Friday 11 October 2002 10:01 am, stephen wrote:
> > On Fri, Oct 11, 2002 at 04:13:28AM -0700, Stephen Turner wrote:
> > > hey, i was reading about how threads use less resources than actual
> > > applications, well that makes sense and all but why hasnt apache
> > > adopted this before? and how much resources do you think it saves?
> >
> > This depends on the OS, but linuxthreads in glibc is implemented
> > in userspace so threads in linux are not lightweight processes
> > scheduled by the kernel.
> 
> Huh?  The linux pthreads implementation for the last 4-5 years has been 
> exactly the opposite.  It is all done in the kernel via a very clever 
> hack so that the kernel cannot tell the difference between a thread and 
> a process.  Threads are scheduled in the kernel exactly like processes.  
> Thread creation takes about the same amount of time as process 
> creation, too.  It is only a little faster.

Oh ok, you're right.  I remember now.  This is where pthreads uses
__clone() to create a new process.

thanks,
stephen

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