ARSC T3D Users' Newsletter 18, January 13, 1995
Optimization on the T3D
CRI has produced a collection of papers on optimizing on the T3D. I will e-mail any of them to T3D users who request them. Below is the README file that describes the collection:
CRAY T3D Optimization Techniques DRAFT A (November 1994) The ASCII and PostScript files in this directory contain information on CRAY T3D optimization techniques. You can use your local print command (for example, lpr(1)) to print these files on your PostScript printer. This information is being distirbuted for Cray Research customer use. Please note that the information in these files is related to the current design and implementation of software on the CRAY T3D system. It is subject to change without notice. This may mean that a code change made to optimize a program in one release may prove to be unnecessary or even nonoptimal in a subsequent release. The file names and the titles of the papers correspond as follows: File Name Title --------- ----- T3D_opt.ps Single-PE Optimization Techniques for the CRAY T3D System as_times.ps Programming for Performance in CRAFT on the CRAY T3D System datalayout.ps Data Layout and Its Affect on Single-processor Performance on CRAY T3D Systems io_opt.ascii Input/Output (I/O) Optimization for CRAY T3D Systems pvm_opt.ascii Parallel Virtual Machine (PVM) Optimization Guide shmem.ascii Shared Memory Gets and Puts on the CRAY T3D System We hope that these papers help you in your optimization efforts. These papers are our first step in an ongoing effort to provide optimization information. More formal information will be distributed as the CRAY T3D optimization methods evolve. If you have comments on these papers, please send them to firstname.lastname@example.org.
List of Differences Between T3D and Y-MPThe current list of differences between the T3D and the Y-MP is:
- Data type sizes are not the same (Newsletter #5)
- Uninitialized variables are different (Newsletter #6)
- The effect of the -a static compiler switch (Newsletter #7)
- There is no GETENV on the T3D (Newsletter #8)
- Missing routine SMACH on T3D (Newsletter #9)
- Different Arithmetics (Newsletter #9)
- Different clock granularities for gettimeofday (Newsletter #11)
Ed Kornkven ARSC HPC Specialist ph: 907-450-8669 Kate Hedstrom ARSC Oceanographic Specialist ph: 907-450-8678 Arctic Region Supercomputing Center University of Alaska Fairbanks PO Box 756020 Fairbanks AK 99775-6020
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