GOMP project OpenMP 3.0 design document
Hi list, I found some preliminary documents for the initial GOMP project, but it is old and not much detail. I was wondering whether there is a design document for OpenMP 3.0? Or something similar. That would be really helpful. Many thanks. Cheers, Tim
OpenMP 3.0 Task implementation
Hi, I am currently reading the libgomp source code, hoping to understand how gcc schedule tasks and how pthread pool is used in a nested parallel region. On the manual section, there are implementation ABI for PARALLEL, SINGLE, etc constructs. But for some reason, I don't find the same info for TASK construct. I would like to know how gcc transform the code when encounter a TASK construct in OpenMP 3.0. I am looking for information details like this (for example, http://gcc.gnu.org/onlinedocs/gcc-4.4.1/libgomp/Implementing-PARALLEL-construct.html#Implementing-PARALLEL-construct). Could someone help me out? Many thanks. Cheers, Tim
OpenMP 3.0 libgomp ABI documentation for TASK construct
Hi, >From gcc online docs (http://gcc.gnu.org/onlinedocs/libgomp/), I found documentations for most of OpenMP constructs, except one very important construct TASK. I don't know why it is missing, but I really need to find out how TASK get transformed into GOMP_* routines. I posted this question before, but haven't got a reply yet. I am very grateful if someone can point me to the right track. For example, is there a pretty-print feature of the AST after processing the OpenMP pragmas? If so, how? Of course, if someone have the expertise, and directly show me how TASK get transformed, it would be even better! Many thanks! Cheers, Tim
Re: OpenMP 3.0 libgomp ABI documentation for TASK construct
That's super! Thank you Antoniu. With the capacity of printing the expanded code, it feels a lot more freedom now when reading the source code of libgomp. Cheers, Tim On Mon, Oct 5, 2009 at 8:29 AM, Antoniu Pop wrote: > Hi Tim, > > >> From gcc online docs (http://gcc.gnu.org/onlinedocs/libgomp/), I found >> documentations for most of OpenMP constructs, except one very >> important construct TASK. > > I cannot answer this. It may be that the documentation was written > before tasks (which were introduced in a latter version of OpenMP) > were added to GCC OpenMP. > >> >> I don't know why it is missing, but I really >> need to find out how TASK get transformed into GOMP_* routines. I >> posted this question before, but haven't got a reply yet. I am very >> grateful if someone can point me to the right track. For example, is >> there a pretty-print feature of the AST after processing the OpenMP >> pragmas? If so, how? Of course, if someone have the expertise, and >> directly show me how TASK get transformed, it would be even better! > > > For the pretty print, just use -fdump-tree-ompexp-all on the compile > line and look for the file *.c.*ompexp that is generated. It contains > the dump just after OpenMP expansion. > > If you need to check out the code generation routines by yourself, > take a look at gcc/omp-low.c > Most of everything happens there. There are two passes, OpenMP > lowerring then expansion. The generation of the GOMP_* routine calls > happens during expansion pass and so you should start from the > "expand_omp_taskreg" function (in gcc/omp-low.c). > > Best, > Antoniu >
