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OLCF Hackathon 19-23 Oct 2015
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gcc OpenACC runtime errors #4

Open babouFomb opened 7 years ago

babouFomb commented 7 years ago

Hi, I follow your script for build gcc-5 openacc implementation. All run well, gcc was built successfully. I don't yet add my new gcc in my path. When I type, gcc -v I get the following output:

rokiatou@rokiatou:~/Packages/GCCAUTO/install$ ./bin/gcc -v Using built-in specs. COLLECT_GCC=./bin/gcc COLLECT_LTO_WRAPPER=/home/rokiatou/Packages/GCCAUTO/install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.4.1/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none Target: x86_64-unknown-linux-gnu Configured with: /home/rokiatou/Packages/GCCAUTO//src/gcc/configure --prefix= --disable-bootstrap --enable-languages=c,c++,fortran,lto --disable-multilib --enable-offload-targets=nvptx-none=/home/rokiatou/Packages/GCCAUTO//install --with-cuda-driver-include=/usr/local/cuda/include CC='gcc -m64' CXX='g++ -m64' --with-gmp=/home/rokiatou/Packages/GCCAUTO/src/gmp/install --with-mpfr=/home/rokiatou/Packages/GCCAUTO/src/mpfr/install --with-mpc=/home/rokiatou/Packages/GCCAUTO/src/mpc/install --with-sysroot= Thread model: posix gcc version 5.4.1 20170404 (GCC)

I wanted to test the following OpenACC simple program: ` #include 

    #define N 2000000000

    #define vl 1024

    int main(void) {

            double pi = 0.0f;
            long long i;

            #pragma acc parallel vector_length(vl) 
            #pragma acc loop reduction(+:pi)
            for (i=0; i<N; i++) {
              double t= (double)((i+0.5)/N);
              pi +=4.0/(1.0+t*t);
            }

            printf("pi=%11.10f\n",pi/N);

            return 0;

    }`

I compiled successfully my program with this flag:

rokiatou@rokiatou:~/Packages/GCCAUTO/test-openacc$ ../install/bin/gcc test.c -fopenacc -foffload=nvptx-none -foffload="-O3" -O3 -lm -g -pg -o gpu

But when I run the object file, I get a Segmentation fault message. I tried to debug with gbd, this is the gdb output:

rokiatou@rokiatou:~/Packages/GCCAUTO/test-openacc$ gdb ./gpu GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: http://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./gpu...done. (gdb) run Starting program: /home/rokiatou/Packages/GCCAUTO/test-openacc/gpu [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007ffff78c7e4b in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1 (gdb) bt

0 0x00007ffff78c7e4b in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1

1 0x00007ffff78c63f6 in GOACC_parallel () from /usr/lib/x86_64-linux-gnu/libgomp.so.1

2 0x0000000000400879 in main () at test.c:12

(gdb) q A debugging session is active. Inferior 1 [process 31540] will be killed. Quit anyway? (y or n) y

The program fails at line 12, where there is: #pragma acc parallel vector_length(vl)

Thank. ANy help is welcome.

gitrepoidoscar commented 7 years ago

This is obsolete. Please write e-mail to Wael Elwasif elwasifwr@ornl.gov for the new instructions. New instructions can be found here: https://gcc.gnu.org/wiki/Offloading#How_to_try_offloading_enabled_GCC

On Fri, Apr 7, 2017 at 6:29 AM, babouFomb notifications@github.com wrote:

Hi, I follow your script for build gcc-5 openacc implementation. All run well, gcc was built successfully. I don't yet add my new gcc in my path. When I type, gcc -v I get the following output:

rokiatou@rokiatou:~/Packages/GCCAUTO/install$ ./bin/gcc -v Using built-in specs. COLLECT_GCC=./bin/gcc COLLECT_LTO_WRAPPER=/home/rokiatou/Packages/GCCAUTO/ install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/5.4.1/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none Target: x86_64-unknown-linux-gnu Configured with: /home/rokiatou/Packages/GCCAUTO//src/gcc/configure --prefix= --disable-bootstrap --enable-languages=c,c++,fortran,lto --disable-multilib --enable-offload-targets=nvptx-none=/home/rokiatou/Packages/GCCAUTO//install --with-cuda-driver-include=/usr/local/cuda/include CC='gcc -m64' CXX='g++ -m64' --with-gmp=/home/rokiatou/Packages/GCCAUTO/src/gmp/install --with-mpfr=/home/rokiatou/Packages/GCCAUTO/src/mpfr/install --with-mpc=/home/rokiatou/Packages/GCCAUTO/src/mpc/install --with-sysroot= Thread model: posix gcc version 5.4.1 20170404 (GCC)

I wanted to test the following OpenACC simple program: ` #include 

#define N 2000000000

#define vl 1024

int main(void) {

        double pi = 0.0f;
        long long i;

        #pragma acc parallel vector_length(vl)
        #pragma acc loop reduction(+:pi)
        for (i=0; i<N; i++) {
          double t= (double)((i+0.5)/N);
          pi +=4.0/(1.0+t*t);
        }

        printf("pi=%11.10f\n",pi/N);

        return 0;

}`

I compiled successfully my program with this flag:

rokiatou@rokiatou:~/Packages/GCCAUTO/test-openacc$ ../install/bin/gcc test.c -fopenacc -foffload=nvptx-none -foffload="-O3" -O3 -lm -g -pg -o gpu

But when I run the object file, I get a Segmentation fault message. I tried to debug with gbd, this is the gdb output:

rokiatou@rokiatou:/Packages/GCCAUTO/test-openacc$ gdb ./gpu GNU gdb (Ubuntu 7.7.1-0ubuntu514.04.2) 7.7.1 Copyright (C) 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl. html This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: http://www.gnu.org/software/gdb/bugs/. Find the GDB manual and other documentation resources online at: http://www.gnu.org/software/gdb/documentation/. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./gpu...done. (gdb) run Starting program: /home/rokiatou/Packages/GCCAUTO/test-openacc/gpu [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Program received signal SIGSEGV, Segmentation fault. 0x00007ffff78c7e4b in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1 (gdb) bt

0 0x00007ffff78c7e4b in ?? () from /usr/lib/x86_64-linux-gnu/libgomp.so.1

1 https://github.com/olcf/OLCFHack15/pull/1 0x00007ffff78c63f6 in

GOACC_parallel () from /usr/lib/x86_64-linux-gnu/libgomp.so.1

2 https://github.com/olcf/OLCFHack15/pull/2 0x0000000000400879 in main

() at test.c:12 (gdb) q A debugging session is active. Inferior 1 [process 31540] will be killed. Quit anyway? (y or n) y

The program fails at line 12, where there is: #pragma acc parallel vector_length(vl)

Thank. ANy help is welcome.

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