Re: Sugested tests.

On 05/20/2002 at 12:13:01 PM CET, [email protected] wrote:

>
> "Bill Abt" <[email protected]> writes:
>
> > I wouldn't be suprised.  The tux http server is a low volume server
> > designed for use with LinuxThreads.  It's concentration is purely on
> > performance.  It unfortunately also doesn't scale to well.  It would be

> > interesting to get run the same tests using Apache compiled with
NGPT...
>
> I don't understand this... I thought the point was that you don't have
> to recompile, you just run Apache (or whatever) on a box with NGPT.

Apache by default does not build using LinuxThreads (because of bugs and
other problems).  In order for you to get a version of Apache that uses
LinuxThreads or NGPT you need to re-compile.  This has nothing to do with
NGPT versus LinuxThreads.

>
> My understanding was that NGPT replaces the threads implementation
> with (an ABI compatible) something that maps user space threads to
> (possibly many) kernel threads.
>

This is correct with one caveat.  ABI compatibility exists where it will
not break POSIX.  The overall goals of the project was to bring full POSIX
compatibility to Linux.  In virtually all case we've been able to protect
POSIX while doing ABI.  However, there are applications (notoriously, our
own IBM JVM) that added workarounds to get around problems in LinuxThreads
and these workarounds prevent the app from running on NGPT...

Let me know if you have anymore questions/comments/etc...  Thanks.


Regards,
     Bill Abt
     Senior Software Engineer
     Next Generation POSIX Threading for Linux
     IBM Cambridge, MA, USA 02142
     Ext: +(00)1 603-673-3440 or +(00)1 617-693-1591
     T/L: 253-9938 (Normal)
     T/L: 693-1591 (Backup)
     Cell: +(00)1 617-803-7514
     [email protected] or [email protected]
     http://oss.software.ibm.com/developerworks/opensource/pthreads