[Openmp-dev] [cfe-dev] Error building openmp 3.1 on clang 3.7

[Jonas Hahnfeld via Openmp-dev]

Hi,

I don't see a connection to the topic that was originally discussed in 
the thread?
In general I'm not sure if I correctly understand your question: If you 
use parallel regions on the host there is only one team of threads and 
its size is influenced in the usual ways (num_threads() clause, 
omp_set_num_threads() API call, OMP_NUM_THREADS environment variable). 
As you talk about "thread-blocks" and explicitly mention OpenMP 4.x do 
you mean execution on the host or are you using the teams construct 
inside a target region?

Jonas

Am 2017-11-23 13:52, schrieb Marcelo Novaes:
> Hi all,
> 
> I was wondering if from OpenMP 4.0 to OpenMP 4.5, does the way it
> chooses the number of thread-blocks and the number of threads per
> block was changed?
> 
> Thank you very much in advance.
> 
> best,
> Marcelo
> 
> 2017-08-10 6:00 GMT-03:00 Marcelo Novaes <novaes.ssa at gmail.com>:
> 
>> That's fine, for my purpose, it would be good, but I don't need to
>> reflect the current implementation.
>> 
>> I'll try to update it asap :) thank you!
>> 
>> best,
>> Marcelo
>> 
>> 2017-08-10 5:53 GMT-03:00 Jonas Hahnfeld <hahnjo at hahnjo.de>:
>> Hmm, that's bad: 3.7 has been released almost 2 years ago, so
>> whatever results you measure with this pretty much won't reflect the
>> current implementation.
>> 
>> Jonas
>> 
>> Am 2017-08-10 10:43, schrieb Marcelo Novaes:
>> 
>> hello Jonas, I meant, I didn't try any newer version by now.
>> 
>> 2017-08-10 5:43 GMT-03:00 Marcelo Novaes <novaes.ssa at gmail.com>:
>> 
>> Hello Jonas,
>> 
>> I am not able to answer that at least until this weekend, sorry (I
>> am in a rush with a strict deadline).
>> 
>> But I can get back to you with the answer soon.  If you need it
>> really soon, let me know.
>> 
>> best regards,
>> Marcelo
>> 
>> 2017-08-10 5:31 GMT-03:00 Jonas Hahnfeld <hahnjo at hahnjo.de>:
>> Hi Marcelo,
>> 
>> so does this need to be fixed in the source or has that already
>> happened for newer versions?
>> 
>> Thanks,
>> Jonas
>> 
>> Am 2017-08-10 10:27, schrieb Marcelo Novaes:
>> 
>> Hi Jonas,
>> 
>> I've figured it out and forgot to reply here.
>> 
>> Anyways, thank you for the reply!
>> 
>> best
>> 
>> --
>> Solution: added ffi dynamic lib inside the
>> openmp/src/CMakeLists.txt.
>> Then, built openmp (make sure the binary once compiled is linked
>> with
>> the correct omp, not gomp (from gcc) checking via ldd).
>> 
>> 2017-08-10 4:12 GMT-03:00 Jonas Hahnfeld <hahnjo at hahnjo.de>:
>> 
>> Hi,
>> 
>> +openmp-dev for discussion about the runtime.
>> 
>> 3.7 is quite old, do you see the same problem with 4.0.1? There
>> might be some patches in that fixed the build for ARM.
>> 
>> Regards,
>> Jonas
>> 
>> Am 2017-08-09 19:15, schrieb Marcelo Novaes via cfe-dev:
>> 
>> Hi all,
>> 
>> Should I be able to use OpenMP 3.1 using Clang 3.7 on  LLVM 3.7 on
>> an
>> ARM board with a Linux 3.10.63+?
>> 
>> I've built the llvm 3.7 with clang 3.7 successfully, but it didn't
>> generate omp dynamic lib. I'm getting an error when I try to do a
>> "make" inside of my build/projects/openmp.
>> 
>> Linking C shared library ../../../../lib/libomp.so
>> CMakeFiles/omp.dir/z_Linux_util.c.o: In function
>> `__kmp_invoke_microtask':
>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0x9e): undefined
>> reference to `ffi_prep_cif'
>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0xac): undefined
>> reference to `ffi_call'
>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0xd4): undefined
>> reference to `ffi_type_pointer'
>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0xd8): undefined
>> reference to `ffi_type_void'
>> collect2: error: ld returned 1 exit status
>> make[2]: *** [lib/libomp.so] Error 1
>> 
>> However, I have libffi linked, it didn't help.
>> 
>> I want to generate a dyn lib I can call, I was calling a dyn from
>> my
>> gcc, but clang was not able to execute multi thread code compiled
>> with
>> the gcc's dynamic lib (it basically ignored the pragmas).
>> _______________________________________________
>> cfe-dev mailing list
>> cfe-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev [1] [1] [1]
>> 
>> --
>> 
>> Best,
>> Marcelo
>> 
>> Links:
>> ------
>> [1] http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev [1] [1]
>> 
>> --
>> 
>> Best,
>> Marcelo
>> 
>> --
>> 
>> Best,
>> Marcelo
>> 
>> Links:
>> ------
>> [1] http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev [1]
> 
> --
> 
> Best,
> Marcelo
> 
> --
> 
> Best,
> Marcelo
> 
> Links:
> ------
> [1] http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev