Jim Jagielski wrote:
I should have said "Forget being able to efficiently use SMP architectures -on Linux- with the current pthread implementation. I am ranting about Linux because that is the OS that runs most Apache installations.Bill Stoddard wrote:Running a threaded mpm on Linux is just not interesting today. The memory footprint of the server is reduced, but so is the performance (requests per second). Even worse, with the current Linux pthread implementation, the threaded MPM does not provide appreciably better scalability (ability to support large numbers of concurrent clients) than the prefork MPM. And just forget being able to efficiently use SMP architectures with the threaded MPM.
More like -huge-. The threaded MPM makes a big (think nearly an order of magnitude) difference in scalability on AIX. I expect the same is true on Solaris. I also think we will see similar results on Linux with either of the new pthread libraries.Agreed. For some/many, prefork is just fine. Also, depending on the OS, worker may or may not be a 'Wow maker'. As you said, under Linux it's not a big diff, under other OSs (like Solaris), the difference is appreciable.
Bill
