Hi everybody, I'm currently working on an opensource project that aims to trace NPTL routines in order to help users to analyze and understand performance problems and/or debug their multi-threaded applications. This tool, named PTT (Posix Thread Trace Toolkit), shows NPTL routines calls and exits, as well as internal mechanisms details of the library, with a very low impact on performance. PTT can save a lot of time when debugging complex (or even simpler) multi-threaded programs that don't behave as expected. A multi-threaded application can be traced without being recompiling. A binary file recording NPTL events is built by PTT while tracing. Once the application is dead, this binary file is translated into a text file that can be read manually or parsed by another program to extract useful information. To trace NPTL, PTT comes with a patch for the glibc that: - inserts trace points into NPTL routines. - provides a module to gather these traces. - modifies configuration files of the glibc, thus allowing to build 2 versions of the glibc: - one with NO modification of the original glibc. - one adding trace points to NPTL (./configure --with-ptt). Up till now, PTT users have to build the patched glibc before using PTT. However, it would be easier to have a system glibc with 2 versions of libpthread: the traditional NPTL and the NPTL with support for PTT. Building such a system is very easy (guidelines can be found in the PTT package available for download at http://sourceforge.net/projects/nptltracetool/) and just add a shared library to the original set of glibc librairies. Do you think this tool could be useful for Suse Linux users? If so, including it in the distribution would involve the following two things: - adding a new RPM package for PTT tools (like for almost every softwares included in a distribution :-)). - modifying the way the glibc is built to provide 2 NPTL libraries: the default one and the instrumented one. This should not be very difficult (a few changes in glibc.spec), but as it modifies the system configuration, Suse maintainers will surely be a little reluctant. I'd like to know about chances for PTT to be included in Suse. If you have any question, I'll be pleased to answer. PTT documentation can be found at http://nptltracetool.sourceforge.net/. Thank you... Regards, Guillaume