GCC: OpenMP posix pthread
Hi, I'm starting to use Helgrind a tool of Valgrind. I read on the manual the following statement: Runtime support library for GNU OpenMP (part of GCC), at least for GCC versions 4.2 and 4.3. The GNU OpenMP runtime library (libgomp.so) constructs its own synchronisation primitives using combinations of atomic memory instructions and the futex syscall, which causes total chaos since in Helgrind since it cannot "see" those. In the latest version of GCC, is this still true or now the OpenMP uses the standard POSIX pthread? Thank you
Re: GCC: OpenMP posix pthread
> On 2/19/2012 9:42 AM, erotavlas_tu...@libero.it wrote: > > > I'm starting to use Helgrind a tool of Valgrind. I read on the manual the > > following statement: > > Runtime support library for GNU OpenMP (part of GCC), at least for GCC > > versions 4.2 and 4.3. The GNU OpenMP runtime library (libgomp.so) > > constructs its own synchronisation primitives using combinations of atomic > > memory instructions and the futex syscall, which causes total chaos since > > in Helgrind since it cannot "see" those. > > > > In the latest version of GCC, is this still true or now the OpenMP uses the > > standard POSIX pthread? > > > > Do you have a specific OS family in mind? > > > -- > Tim Prince > Yes, I'm talking about the UNIX OS (Linux, MacOSx). The tool valgrind is only available for these systems. Salvatore Frandina
GCC and x86intrin.h header
Hi, I read in the manual of GCC the following line: // new intrinsic header file, it should be included before using any IA-32/x86-64 intrinsics. What does it mean? I have to explicitly include this library in my code if I want to use the intrinsic functions like ssex or mcrc32 etc. Thank you
Re: GCC: OpenMP posix pthread
Nobody can answer to my question? Thank you Salvatore Frandina
Re: GCC: OpenMP posix pthread
Hi, thank you for your reply. So I cannot use the Helgrind tool without disabling the futexes. Do you know if exist a open source thread analyzer? Thank you
Re: GCC: OpenMP posix pthread
Hi, I have found the solution i.e. the developers of GCC have found it. The latest version of GCC 4.6.3 can be used with Helgrind. See here for more detail http://gcc.gnu.org/onlinedocs/libstdc++/manual/debug.html#debug.races Best Regards Salvatore
GCC optimization report
Hi all, I would like to know if GCC provides an option to get a detailed report on the optimization actually performed by the compiler. For example with the Intel C compiler it is possible using the -opt-report. I don't want to look at the assembly file and figure out the optimization. Thank you Best Regards Salvatore Frandina
GCC support of openACC
Hi, I would like to know if the next release of GCC will support the openACC directives. At the moment only commercial compilers support the openACC standard. Thank you Salvatore
