QLogic OFED+ Host Software User Guide, Rev. B

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5–Using Other MPIs Improving Performance of Other MPIs Over InfiniBand Verbs uDAPL 1.2: -genv I_MPI_DEVICE rdma:OpenIB-cma uDAPL 2.0: -genv I_MPI_DEVICE rdma:ofa-v2-ib To help with debugging, you can add this option to the Intel mpirun command: TMI: -genv TMI_DEBUG 1 uDAPL: -genv I_MPI_DEBUG 2 Further Information on Intel MPI For more information on using Intel MPI, see: http://www.intel.com/ Improving Performance of Other MPIs Over InfiniBand Verbs Performance of MPI applications when using an MPI implementation over InfiniBand Verbs can be improved by tuning the InfiniBand MTU size. NOTE: No manual tuning is necessary for PSM-based MPIs, since the PSM layer determines the largest possible InfiniBand MTU for each source/destination path. The maximum supported MTU size of InfiniBand adapter cards is 4K. Support for 4K InfiniBand MTU requires switch support for 4K MTU. The method to set the InfiniBand MTU size varies by MPI implementation: • Open MPI defaults to the lower of either the InfiniBand MTU size or switch MTU size. • MVAPICH defaults to an InfiniBand MTU size of 1024 bytes. This can be over-ridden by setting an environment variable: $ export VIADEV_DEFAULT_MTU=MTU4096 Valid values are MTU256, MTU512, MTU1024, MTU2048 and MTU4096. This environment variable must be set for all processes in the MPI job. To do so, use ~/.bashrc or use of /usr/bin/env. 5-14 D000046-005 B
5–Using Other MPIs Improving Performance of Other MPIs Over InfiniBand Verbs • HP-MPI over InfiniBand Verbs automatically determines the InfiniBand MTU size. • Platform (Scali) MPI defaults to an InfiniBand MTU of 1KB. This can be changed by adding a line to /opt/scali/etc/iba_params.conf, for example: mtu=2048 A value of 4096 is not allowed by the Scali software (as of Scali Connect 5.6.0); in this case, a default value of 1024 bytes is used. This problem has been reported to support at Platform Inc. The largest value that can currently be used is 2048 bytes. • Intel MPI over uDAPL (which uses InfiniBand Verbs) automatically determines the InfiniBand MTU size. D000046-005 B 5-15
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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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Page 53 and 54: 3-TrueScale Cluster Setup and Admin
Page 63 and 64: 4 Running QLogic MPI on QLogic Adap
Page 65 and 66: 4-Running QLogic MPI on QLogic Adap
Page 91 and 92: 5 Using Other MPIs Introduction Thi
Page 93 and 94: 5-Using Other MPIs Open MPI Open MP
Page 95 and 96: 5-Using Other MPIs MVAPICH Further
Page 97 and 98: 5-Using Other MPIs Managing Open MP
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Page 101 and 102: 5-Using Other MPIs Intel MPI Intel
Page 103: 5-Using Other MPIs Intel MPI When u
Page 107 and 108: 6 Performance Scaled Messaging Intr
Page 109 and 110: 6-Performance Scaled Messaging Usin
Page 111 and 112: 7 Dispersive Routing Infiniband use
Page 113 and 114: 7-Dispersive Routing • Static_Des
Page 115 and 116: 8 gPXE gPXE Setup gPXE is an open s
Page 117 and 118: 8-gPXE Preparing the DHCP Server in
Page 119 and 120: 8-gPXE Netbooting Over InfiniBand P
Page 121 and 122: 8-gPXE Netbooting Over InfiniBand W
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Page 129 and 130: 8-gPXE HTTP Boot Setup 5. Create an
Page 131 and 132: A mpirun Options Summary This secti
Page 133 and 134: A-mpirun Options Summary Quiescence
Page 135 and 136: A-mpirun Options Summary Tuning Opt
Page 137 and 138: A-mpirun Options Summary Format Opt
Page 139 and 140: B Benchmark Programs Several MPI pe
Page 141 and 142: B-Benchmark Programs Benchmark 2: M
Page 143 and 144: B-Benchmark Programs Benchmark 4: M
Page 145 and 146: C VirtualNIC Interface Configuratio
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C-VirtualNIC Interface Configuratio
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D SRP Configuration SRP Configurati
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D-SRP Configuration QLogic SRP Conf
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D-SRP Configuration OFED SRP Config
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E Integration with a Batch Queuing
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E-Integration with a Batch Queuing
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E-Integration with a Batch Queuing
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F Troubleshooting This appendix des
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F-Troubleshooting Kernel and Initia
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F-Troubleshooting Kernel and Initia
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F-Troubleshooting OpenFabrics and I
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F-Troubleshooting Performance Issue
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F-Troubleshooting QLogic MPI Troubl
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G ULP Troubleshooting Troubleshooti
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G-ULP Troubleshooting Troubleshooti
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H Write Combining Introduction Writ
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H-Write Combining MTRR Mapping and
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I Useful Programs and Files The mos
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I-Useful Programs and Files Summary
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I-Useful Programs and Files Common
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J Recommended Reading Reference mat
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Corporate Headquarters QLogic Corpo
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