Re: [Xen-users] /lib/tls.disable vs. software requiring tls

[Christophe Yayon <lists@xxxxxxxx>]

Ernst Bachmann wrote:
> On Tuesday 14 March 2006 20:11, you wrote:
> > Hi,
> >
> > but what about tomcat ? I use jre (java binary) which is linked to tls
> > (thread local storage) :
> >
> > ldd /opt/jre/bin/java
> >          linux-gate.so.1 =>  (0xffffe000)
> >          libpthread.so.0 => /lib/tls/libpthread.so.0 (0xb7f34000)
> >          libdl.so.2 => /lib/tls/libdl.so.2 (0xb7f30000)
> >          libc.so.6 => /lib/tls/libc.so.6 (0xb7df9000)
> >          /lib/ld-linux.so.2 (0xb7f4b000)
> >
> > when i start a tomcat instance in a xen domU, i get lot of processes
> > instead a single (but multi-threaded) process ?
> Thats because in the old thread library each thread got its own process ID, 
> the kernel had only little support for threads, so it had to be done that 
> way.
> (With nptl, they still have an own PID, but its hidden from the userspace 
> better)
> Without xen, nptl provides a huge speed boost to threaded applications (esp 
> Java), so you really should try to get a xen-compilant NPTL glibc running.
> => no speed loss from xen emulating TLS, but all the benefits from futexes, 
> fast context switch between threads, ...
> So, moving /lib/tls away is just a quick workarround, installing a "fixed" 
> glibc is a solution.
> /Ernst
>
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Thanks for your answer Ernst,

Do you know where could i get a fixed glibc ? any project ?


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