Hi Gilles, On 07/13/16 01:10, Gilles Gouaillardet wrote:
Paul,The two header files in include/mpp simply include the file with the same name in the upper directory.
Yessir! (and CMake do not care about the upper directory and build infinite loop)
A simple workaround is to replace these two files in include/mpp with symbolic links to files with the same name in the upper directory. Would you mind giving this a try ?
It work very well, at least for the one test case provided. So yes, patching any installation of Open MPI could be a workaround. However we would really love to avoid this need to patch any Open MPI installation
Maybe OpenMPI's developer could think about how-to minimize the probability of such loops? Symlink is one alternative, another one would be renaming one of the headers..
we fully trust to Open MPI's developers expertise in this :-) Have a nice day, Paul Kapinospk224850@linuxc2:/opt/MPI/openmpi-1.8.1/linux/intel/include[519]$ ls -la mpp/shmem.fh
lrwxrwxrwx 1 pk224850 pk224850 11 Jul 13 13:20 mpp/shmem.fh -> ../shmem.fh
Cheers, Gilles On Wednesday, July 13, 2016, Paul Kapinos <kapi...@itc.rwth-aachen.de <mailto:kapi...@itc.rwth-aachen.de>> wrote: Dear OpenMPI developer, we have some troubles when using OpenMPI and CMake on codes using 'SHMEM'. Cf. 'man shmem_swap', > Fortran: > INCLUDE "mpp/shmem.fh" Yes here is one such header file: > openmpi-1.X.Y/oshmem/include/mpp/shmem.fh ... since version 1.7. at least. The significnat content is this line: > include 'shmem.fh' whereby OpenMPI mean to include not the same file by itself (= infinite loop!) but I believe these one file: > openmpi-1.X.Y/oshmem/include/shmem.fh (The above paths are in the source code distributions; in the installation the files are located here: include/shmem.fh include/mpp/shmem.fh) This works. Unless you start using CMake. Because CMake is 'intelligent' and try to add the search paths recursively, (I believe,) gloriously enabling the infinite loop by including the 'shmem.fh' file from the 'shmem.fh' file. Steps to repriduce: $ mkdir build; cd build; cmake .. $ make The second one command need some minute(s), sticking by the 'Scanning dependencies of target mpihelloworld' step. If connecting by 'strace -p <PID>' to the 'cmake' process you will see lines like below, again and again. So I think CMake just include the 'shmem.fh' file from itself unless the stack is full / a limit is reached / the moon shines, and thus hangs for a while (seconds/minutes) in the 'Scanning dependencies...' state. *Well, maybe having a file including the same file is not that good?* If the file 'include/mpp/shmem.fh' would include not 'shmem.fh' but 'somethingelse.fh' located in 'include/...' these infinite loop would be impossible at all... And by the way: is here a way to limit the maximum include depths in CMake for header files? This would workaround this one 'infinite include loop' issue... Have a nice day, Paul Kapinos .............. access("/opt/MPI/openmpi-1.10.2/linux/intel_16.0.2.181/include/mpp/shmem.fh", R_OK) = 0 stat("/opt/MPI/openmpi-1.10.2/linux/intel_16.0.2.181/include/mpp/shmem.fh", {st_mode=S_IFREG|0644, st_size=205, ...}) = 0 open("/opt/MPI/openmpi-1.10.2/linux/intel_16.0.2.181/include/mpp/shmem.fh", O_RDONLY) = 5271 fstat(5271, {st_mode=S_IFREG|0644, st_size=205, ...}) = 0 mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f08457d2000 read(5271, "!\n! Copyright (c) 2013 Me"..., 32768) = 205 read(5271, "", 32768) = 0 access("/opt/MPI/openmpi-1.10.2/linux/intel_16.0.2.181/include/mpp/shmem.fh", R_OK) = 0 stat("/opt/MPI/openmpi-1.10.2/linux/intel_16.0.2.181/include/mpp/shmem.fh", {st_mode=S_IFREG|0644, st_size=205, ...}) = 0 open("/opt/MPI/openmpi-1.10.2/linux/intel_16.0.2.181/include/mpp/shmem.fh", O_RDONLY) = 5272 fstat(5272, {st_mode=S_IFREG|0644, st_size=205, ...}) = 0 mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f08457ca000 read(5272, "!\n! Copyright (c) 2013 Me"..., 32768) = 205 read(5272, "", 32768) = 0 .............. -- Dipl.-Inform. Paul Kapinos - High Performance Computing, RWTH Aachen University, IT Center Seffenter Weg 23, D 52074 Aachen (Germany) Tel: +49 241/80-24915 _______________________________________________ devel mailing list de...@open-mpi.org Subscription: https://www.open-mpi.org/mailman/listinfo.cgi/devel Link to this post: http://www.open-mpi.org/community/lists/devel/2016/07/19195.php
-- Dipl.-Inform. Paul Kapinos - High Performance Computing, RWTH Aachen University, IT Center Seffenter Weg 23, D 52074 Aachen (Germany) Tel: +49 241/80-24915
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