QLogic OFED+ Host Software User Guide, Rev. B

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F–Troubleshooting QLogic MPI Troubleshooting In the next case, mpi_nxnlatbw.c is compiled with the HP-MPI version of mpicc, and given the name hpmpi-mpi_nxnlatbw, so that it is easy to see which version was used. However, it is run with the QLogic mpirun, which produces errors similar to this: $ /opt/hpmpi/bin/mpicc \ /usr/share/mpich/examples/performance/mpi_nxnlatbw.c -o hpmpi-mpi_nxnlatbw $ mpirun -m ~/host-bbb -np 4 ./hpmpi-mpi_nxnlatbw ./hpmpi-mpi_nxnlatbw: error while loading shared libraries: libmpio.so.1: cannot open shared object file: No such file or directory ./hpmpi-mpi_nxnlatbw: error while loading shared libraries: libmpio.so.1: cannot open shared object file: No such file or directory ./hpmpi-mpi_nxnlatbw: error while loading shared libraries: libmpio.so.1: cannot open shared object file: No such file or directory ./hpmpi-mpi_nxnlatbw: error while loading shared libraries: libmpio.so.1: cannot open shared object file: No such file or directory MPIRUN: Node program(s) exitted during connection setup The following two commands will work properly. QLogic mpirun and executable used together: $ mpirun -m ~/host-bbb -np 4 /usr/bin/mpi_nxnlatbw The HP-MPI mpirun and executable used together: $ /opt/hpmpi/bin/mpirun -hostlist \ "bbb-01,bbb-02,bbb-03,bbb-04" -np 4 ./hpmpi-mpi_nxnlatbw Hints • Use the rpm command to find out which RPM is installed in the standard installed layout. For example: # rpm -qf /usr/bin/mpirun mpi-frontend-2.3-5314.919_sles10_qlc • Check all rcfiles and /opt/infinipath/etc/mpirun.defaults to make sure that the paths for binaries and libraries ($PATH and $LD_LIBRARY _PATH) are consistent. • When compiling, use descriptive names for the object files. F-18 D000046-005 B
F–Troubleshooting QLogic MPI Troubleshooting See “Compiler Cannot Find Include, Module, or Library Files” on page F-14, “Compiling on Development Nodes” on page F-15, and “Specifying the Run-time Library Path” on page F-15 for additional information. Process Limitation with ssh MPI jobs that use more than eight processes per node may encounter an ssh throttling mechanism that limits the amount of concurrent per-node connections to 10. If you have this problem, a message similar to this appears when using mpirun: $ mpirun -m tmp -np 11 ~/mpi/mpiworld/mpiworld ssh_exchange_identification: Connection closed by remote host MPIRUN: Node program(s) exitted during connection setup If you encounter a message like this, you or your system administrator should increase the value of MaxStartups in your sshd configurations. NOTE: This limitation applies only if -distributed=off is specified. By default, with -distributed=on, you will not normally have this problem. Number of Processes Exceeds ulimit for Number of Open Files When users scale up the number of processes beyond the number of open files allowed by ulimit, mpirun will print an error message. The ulimit for the number of open files is typically 1024 on both Red Hat and SLES systems. The message will look similar to: MPIRUN.up001: Warning: ulimit for the number of open files is only 1024, but this mpirun request requires at least open files (sockets). The shell ulimit for open files needs to be increased. This is due to limit: descriptors 1024 The ulimit can be increased; QLogic recommends an increase of approximately 20 percent over the number of CPUs. For example, in the case of 2048 CPUs, ulimit can be increased to 2500: ulimit -n 2500 The ulimit needs to be increased only on the host where mpirun was started, unless the mode of operation allows mpirun from any node. D000046-005 B F-19
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QLogic OFED+ Host Software User Gui
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Table of Contents 1 Introduction Ho
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Preface The QLogic OFED+ Host Softw
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Preface Technical Support Technical
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1 Introduction How this Guide is Or
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1-Introduction Interoperability QLo
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2 Step-by-Step Cluster Setup and MP
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3 TrueScale Cluster Setup and Admin
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3-TrueScale Cluster Setup and Admin
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4 Running QLogic MPI on QLogic Adap
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4-Running QLogic MPI on QLogic Adap
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5 Using Other MPIs Introduction Thi
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5-Using Other MPIs Open MPI Open MP
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5-Using Other MPIs MVAPICH Further
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5-Using Other MPIs Managing Open MP
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5-Using Other MPIs Platform (Scali)
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5-Using Other MPIs Intel MPI Intel
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5-Using Other MPIs Intel MPI When u
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5-Using Other MPIs Improving Perfor
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6 Performance Scaled Messaging Intr
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6-Performance Scaled Messaging Usin
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7 Dispersive Routing Infiniband use
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7-Dispersive Routing • Static_Des
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8 gPXE gPXE Setup gPXE is an open s
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8-gPXE Preparing the DHCP Server in
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8-gPXE Netbooting Over InfiniBand P
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8-gPXE Netbooting Over InfiniBand W
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8-gPXE Netbooting Over InfiniBand #
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8-gPXE Netbooting Over InfiniBand #
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8-gPXE Netbooting Over InfiniBand T
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8-gPXE HTTP Boot Setup 5. Create an
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A mpirun Options Summary This secti
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A-mpirun Options Summary Quiescence
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A-mpirun Options Summary Tuning Opt
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A-mpirun Options Summary Format Opt
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B Benchmark Programs Several MPI pe
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B-Benchmark Programs Benchmark 2: M
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B-Benchmark Programs Benchmark 4: M
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C VirtualNIC Interface Configuratio
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C-VirtualNIC Interface Configuratio
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Page 159 and 160: C-VirtualNIC Interface Configuratio
Page 161 and 162: D SRP Configuration SRP Configurati
Page 163 and 164: D-SRP Configuration QLogic SRP Conf
Page 185 and 186: D-SRP Configuration OFED SRP Config
Page 187 and 188: E Integration with a Batch Queuing
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Page 193 and 194: F Troubleshooting This appendix des
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Page 199 and 200: F-Troubleshooting OpenFabrics and I
Page 201 and 202: F-Troubleshooting Performance Issue
Page 203 and 204: F-Troubleshooting QLogic MPI Troubl
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Page 225 and 226: G ULP Troubleshooting Troubleshooti
Page 227 and 228: G-ULP Troubleshooting Troubleshooti
Page 241 and 242: H Write Combining Introduction Writ
Page 243 and 244: H-Write Combining MTRR Mapping and
Page 245 and 246: I Useful Programs and Files The mos
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I-Useful Programs and Files Common
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I-Useful Programs and Files Summary
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J Recommended Reading Reference mat
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Corporate Headquarters QLogic Corpo
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