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POsegmentation fault with openmp legacy code
 

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  1. POsegmentation fault with openmp legacy code
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    <p>I am trying to applying openmp to legacy fortran code and I tried to do as following but I encounter a runtime error while running the code. </p> <pre><code>Line 89 of expect.f is the line: rv_avg(m) = rv_avg(m) + psi(k,m)*psi(k,m)*rosc(k) forrtl: severe (174): SIGSEGV, segmentation fault occurred Image PC Routine Line Source main 0000000000411CE9 expect_ 89 expect.f libiomp5.so 00002B13E9690FE3 Unknown Unknown Unknown Command exited with non-zero status 174 </code></pre> <p>I have make stack large enough with ulimit and export KMP_STACKSIZE. I am wondering what went wrong and any suggestions about how to optimizing the legacy code. Thanks a lot!</p> <pre><code>login1$ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 514847 max locked memory (kbytes, -l) unlimited max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) unlimited cpu time (seconds, -t) unlimited max user processes (-u) 150 virtual memory (kbytes, -v) 8388608 file locks (-x) unlimited </code></pre> <pre><code>!$OMP PARALLEL shared(ng,nstates,natoms,psi,rosc,grt,frt) !$OMP DO private(k,m)&amp; !$OMP&amp; reduction(+:rv_avg,b_avg) do k = 1, ng do m = 0, nstates - 1 rv_avg(m) = rv_avg(m) + psi(k,m)*psi(k,m)*rosc(k) b_avg(m) = b_avg(m) + psi(k,m)*psi(k,m)/(mu*rosc(k)**2) enddo enddo !$OMP ENDDO !$OMP DO private(k,m,j)&amp; !$OMP&amp; reduction(+:grt_avg) do k = 1,ng do m = 0, nstates -1 do j = 1, 3 grt_avg(m,j) = grt_avg(m,j) + psi(k,m)*psi(k,m)*grt(k,j) enddo enddo enddo !$OMP ENDDO !$OMP DO private(k,m,j,l)&amp; !$OMP reduction(+:frt_avg) do k = 1,ng do m = 0, nstates -1 do j = 1,3 do l = 1, natoms frt_avg(m,l,j) = frt_avg(m,l,j) &amp; + psi(k,m)*psi(k,m)*frt(k,l,j) enddo enddo enddo enddo !$OMP DO private(k,m,j,l,mp)&amp; !$OMP reduction(+:d_coup) do k = 1,ng do m =0 , nstates - 1 do j = 1,natoms do l = 1, natoms do mp = 0, nstates - 1 d_coup(m,mp,l,j) = d_coup(m,mp,l,j) &amp; + psi(k,m)*psi(k,mp)*frt(k,l,j) enddo enddo enddo enddo enddo !$OMP END DO !$OMP END PARALLEL </code></pre>
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