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Scali MPI Connect Release 4.4 Users Guide 2
3.2.6 Notes on compiling with MPI-2 features ...................................................... 23
3.3 Running Scali MPI Connect programs................................................................. 23
3.3.1 Naming conventions................................................................................. 23
3.3.2 mpimon - monitor program....................................................................... 24
3.3.3 mpirun - wrapper script............................................................................ 27
3.4 Suspending and resuming jobs ......................................................................... 28
3.5 Running with dynamic interconnect failover capabilities ....................................... 28
3.6 Running with tcp error detection - TFDR ............................................................ 28
3.7 Debugging and profiling................................................................................... 29
3.7.1 Debugging with a sequential debugger ....................................................... 29
3.7.2 Built-in-tools for debugging....................................................................... 30
3.7.3 Assistance for external profiling ................................................................. 30
3.7.4 Debugging with Etnus Totalview ................................................................ 30
3.8 Controlling communication resources ................................................................ 31
3.8.1 Communication resources on DAT-devices .................................................. 31
3.9 Good programming practice with SMC ............................................................... 32
3.9.1 Matching MPI_Recv() with MPI_Probe() ...................................................... 32
3.9.2 Using MPI_Isend(), MPI_Irecv()................................................................. 32
3.9.3 Using MPI_Bsend() .................................................................................. 32
3.9.4 Avoid starving MPI-processes - fairness ...................................................... 32
3.9.5 Unsafe MPI programs ............................................................................... 33
3.9.6 Name space pollution ............................................................................... 33
3.10 Error and warning messages .......................................................................... 33
3.10.1 User interface errors and warnings........................................................... 33
3.10.2 Fatal errors ........................................................................................... 33
3.11 Mpimon options ............................................................................................ 34
3.11.1 Giving numeric values to mpimon ............................................................ 35
Chapter 4 Profiling with Scali MPI Connect .................................... 37
4.1 Example ........................................................................................................ 37
4.2 Tracing.......................................................................................................... 38
4.2.1 Using Scali MPI Connect built-in trace......................................................... 38
4.2.2 Features................................................................................................. 40
4.3 Timing .......................................................................................................... 41
4.3.1 Using Scali MPI Connect built-in timing....................................................... 41
4.4 Using the scanalyze ........................................................................................ 43
4.4.1 Analysing all2all ...................................................................................... 43
4.5 Using SMC's built-in CPU-usage functionality ...................................................... 45
Chapter 5 Tuning SMC to your application ..................................... 47
5.1 Tuning communication resources ...................................................................... 47
5.1.1 Automatic buffer management .................................................................. 47
5.2 How to optimize MPI performance..................................................................... 48
5.2.1 Performance analysis ............................................................................... 48
5.2.2 Using processor-power to poll ................................................................... 48
5.2.3 Reorder network traffic to avoid conflicts .................................................... 48
5.3 Benchmarking ................................................................................................ 48
- Scali MPI Connect 1
- Users Guide 1
- Software release 4.4 1
- Acknowledgement 2
- Table of contents 13
- Chapter 1 Introduction 17
- 1.2 Support 18
- 1.3 How to read this guide 19
- 1.6 Typographic conventions 21
- 1.5 Terms and conventions 21
- 2.2 SMC network devices 24
- 2.2.1 Network devices 25
- 2.2.2 Shared Memory Device 25
- 2.2.3 Ethernet Devices 25
- 2.2.3.2 DET 26
- 2.2.3.3 Using detctl 26
- 2.2.3.4 Using detstat 26
- 2.2.4 Myrinet 27
- 2.2.5 Infiniband 27
- 2.2.6 SCI 28
- 2.3.1 Channel buffer 28
- 2.3.2 Inlining protocol 29
- 2.3.3 Eagerbuffering protocol 29
- 2.3.4 Transporter protocol 29
- 2.5 MPI-2 Features 30
- Section: 2.5 MPI-2 Features 32
- 3.2 Compiling and linking 33
- 3.2.2 Compiler support 34
- 3.2.3 Linker flags 34
- 3.3.1 Naming conventions 35
- 3.3.2.1 Basic usage 36
- 3.3.2.4 Standard input 37
- 3.3.2.5 Standard output 37
- 3.3.2.7 Network options 38
- 3.3.3 mpirun - wrapper script 39
- 3.7 Debugging and profiling 41
- 3.9.3 Using MPI_Bsend() 44
- 3.9.5 Unsafe MPI programs 45
- 3.9.6 Name space pollution 45
- 3.10.2 Fatal errors 45
- 3.11 Mpimon options 46
- Section: 3.11 Mpimon options 48
- 4.1 Example 49
- 4.2 Tracing 50
- 4.3 Timing 53
- 4.4 Using the scanalyze 55
- 5.3 Benchmarking 60
- 5.4 Collective operations 61
- Appendix A Example MPI code 63
- Appendix B Troubleshooting 66
- B-1.4 General problems 67
- C-8 License options 70
- C-9 Scali kernel drivers 71
- C-10 Uninstalling SMC 71
- Section: 73
- D-1 Bracket expansion 74
- D-2 Grouping 74
- List of figures 78
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