<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Hi all,</div><div class=""><br class=""></div>I am working on simulations using FLASH code. I found that the Nei test unit counters an error in FLASH 4.4. However, I successfully tested this unit in FLASH 4.2.2 with the same computer system and default settings.<br class=""><font color="#12c00e" class=""><br class=""></font>The setup script is “./setup -auto neitest -1d”<br class="">All the files are remained default.<div class=""><br class=""></div><div class="">The intel fortran 2017 is used to compile and execute. The command line after “make” is</div><div class="">“mpirun -np 8 ./flash4” </div><div class="">using 8 CPUs.</div><div class=""><br class=""></div><div class="">The error messages are:</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Element I.D.: 9 elsum = 0.99988912740675984<br class=""> <span class="Apple-tab-span" style="white-space: pre;"> </span>error in routine neimn: wrong sum of population fraction<br class=""> <span class="Apple-tab-span" style="white-space: pre;"> </span>DRIVER_ABORT: error in routine neimn: wrong sum of pop. fraction<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>application called MPI_Abort(MPI_COMM_WORLD, 1) - process 4<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>Fatal error in PMPI_Reduce: Other MPI error, error stack:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>PMPI_Reduce(1270).........: MPI_Reduce(sbuf=0x7fff2e29f610, rbuf=0x7fff2e29f650, count=7, MPI_DOUBLE_PRECISION, MPI_SUM, root=0, MPI_COMM_WORLD) failed<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_impl(1087)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_intra(848)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_impl(1087)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_intra(895)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_binomial(206).: Failure during collective<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_intra(828)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_impl(1087)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_intra(895)....:<br class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>MPIR_Reduce_binomial(144).:<br class=""><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class=""><div class=""><span class="Apple-tab-span" style="white-space: pre;"> </span>dequeue_and_set_error(596): Communication error with rank 2</div></div></div></div></div><div class=""><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class=""><div class=""><br class=""></div><div class="">I have tried to change the accuracy in neimn routine to 0.1 rather than the default 1.e-4. The error exist anyway.</div></div></div></div></div><div class=""><font color="#12c00e" class=""><br class=""></font>This may be a bug in the latest version. I have no idea what’s changed for the 4.4 version. Does any one know what’s happened with the nei unit? As far as I know the update of FLASH code doesn’t change this part.</div><div class=""><br class=""></div><div class="">Best wishes,</div><div class="">Gao-Yuan</div></body></html>