cross-node parallel computing using phc

[zhangyusi-hub]

When tasking for tracking paths using multiple threads, I use the following method: phc -b -t48 cyclic7 ./cyclic7.out But how can I run phc to adopt the cross-node parallel computing method,such as using 2 compute nodes?

[janverschelde]

In order to use message passing, one has to compile for example https://github.com/janverschelde/PHCpack/blob/master/src/MPI/mpi2padcon.c but that does only path tracking, not the blackbox solving such as phc -b -t. The entire blackbox solver is currently not supported to work with message passing.

[zhangyusi-hub]

OK, I will try according to your advice. But when using the blackbox solver such as phc -b -t, how to use the total-degree method, not the mixed-volume method?

[janverschelde]

The blackbox solver is a blackbox in the sense that it tries to make the best choices. In case the mixed volume equals the total degree, then the blackbox solver will use the total degree start system, but the blackbox solver does not has the option to force the use of the total degree start system.

[zhangyusi-hub]

Thanks, I know it. I used the following method to compile the makefile in /PHCpack/src/MPI: cd /PHCpack/src/MPI make all

But there is a following error with gnatbind: invalid switch: -C gcc -c call_hello.c gnatmake -c hello.adb gnatmake: objects up to date. gnatbind -n -C hello gnatbind: invalid switch: -C

And when I modify it with gnatbind -n -c hello, there is another error with gnatlink: Failed to open binder output: gcc -c call_hello.c gnatmake -c hello.adb gnatmake: objects up to date. gnatbind -n -c hello gnatlink -c hello call_hello.o adatest.o -o adatest
--LINK=/BIGDATA1/app/MPI/mpich/3.2.1-gcc-4.8.5-dynamic/bin/mpicc gnatlink: Failed to open binder output Could you tell me how to solve the two problems？