<div dir="ltr"><div><div><div>Please tell us what is wrong and we will fix it.<br><br></div>Seriously: nobody can answer your question unless you specify, as a strict minimum, input data, number of processors and type of parallelization that trigger the error, and where the error occurs (at startup, later, in the middle of the run, ...).<br><br></div><div>Paolo<br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 15, 2016 at 7:50 AM, Chong Wang <span dir="ltr"><<a href="mailto:ch-wang@outlook.com" target="_blank">ch-wang@outlook.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>I compiled quantum espresso 5.4 with intel mpi and mkl 2016 update 3.</div>
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<div>However, when I ran pw.x the following errors were reported:</div>
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<div>...</div>
<div>MPIR_Get_contextid_sparse_group(1330): Too many communicators (0/16384 free on this process; ignore_id=0)</div>
<div>Fatal error in PMPI_Cart_sub: Other MPI error, error stack:</div>
<div>PMPI_Cart_sub(242)...................: MPI_Cart_sub(comm=0xc400fcf3, remain_dims=0x7ffde1391dd8, comm_new=0x7ffde1391d30) failed</div>
<div>PMPI_Cart_sub(178)...................: </div>
<div>MPIR_Comm_split_impl(270)............: </div>
<div>MPIR_Get_contextid_sparse_group(1330): Too many communicators (0/16384 free on this process; ignore_id=0)</div>
<div>Fatal error in PMPI_Cart_sub: Other MPI error, error stack:</div>
<div>PMPI_Cart_sub(242)...................: MPI_Cart_sub(comm=0xc400fcf3, remain_dims=0x7ffc02ad7eb8, comm_new=0x7ffc02ad7e10) failed</div>
<div>PMPI_Cart_sub(178)...................: </div>
<div>MPIR_Comm_split_impl(270)............: </div>
<div>MPIR_Get_contextid_sparse_group(1330): Too many communicators (0/16384 free on this process; ignore_id=0)</div>
<div>Fatal error in PMPI_Cart_sub: Other MPI error, error stack:</div>
<div>PMPI_Cart_sub(242)...................: MPI_Cart_sub(comm=0xc400fcf3, remain_dims=0x7fffb24e60f8, comm_new=0x7fffb24e6050) failed</div>
<div>PMPI_Cart_sub(178)...................: </div>
<div>MPIR_Comm_split_impl(270)............: </div>
<div>MPIR_Get_contextid_sparse_group(1330): Too many communicators (0/16384 free on this process; ignore_id=0)</div>
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<p>I googled and found out this might be caused by hitting os limits of number of opened files. However, After I increased number of opened files per process from 1024 to 40960, the error persists.</p>
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<p>What's wrong here?</p>
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<p>Chong Wang</p>
<p>Ph. D. candidate</p>
<p>Institute for Advanced Study, Tsinghua University, Beijing, 100084</p>
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