ARSC T3D Users' Newsletter 49, August 25, 1995

Programming Environment 1.2.2 Now Default

As of 8/23/95, ARSC is running the 1.2.2 Programming Environment as the default. If you have any problems with this release on the T3D contact Mike Ess, ess@arsc.edu. This release has many new features and some of them were described in the CRI release letter that appeared in T3D newsletter #47 (8/11/95). Below is an additional description of what's in the 1.2.2 release that appeared in the Cray Research Service Bulletin: 


  > 
  > Systems:  PVP, MPP
  > OS:       UNICOS 8.0, UNICOS 9.0,
  >           UNICOS MAX 1.2.0.1 or later
  > Product:  CF77 6.2.2 PE,
  >           CF77 6.2.2 PE for MPP systems,
  >           CF90 1.2.2 PE,
  >           CF90 1.2.2 PE for MPP systems,
  >           Cray Standard C 1.2.2 PE,
  >           Cray Standard C 1.2.2 PE for MPP systems
  > Audience: All
  > Date:     July 1995
  > 
  > The following Cray Programming Environments were released in June:
  > 
  >   CF90 1.2.2 Programming Environment for both Cray PVP and Cray MPP 
  >         systems 
  >   Cray Standard C 1.2.2 Programming Environment for both Cray PVP and
  >         Cray MPP systems 
  >   CF77 6.2.2 Programming Environment for Cray PVP and Cray MPP systems 
  > 
  > The programming environments provide an integrated development environment 
  > and combine compilers with development tools and libraries. Each of these 
  > programming environments includes the CrayTools 1.3.2 package, the 
  > CrayLibs 1.2.2 package for either Cray PVP or Cray MPP systems, and one of 
  > the following compilers:
  > 
  >   CF90 1.0.3 
  >   CF90_M 0.1.2 
  >   SCC 4.0.3 
  >   SCC_M 4.0.4 
  >   CF77 6.0.4 
  >   CF77_M 6.2.1 
  > 
  > You cannot order programming environment components separately; you must 
  > order a complete programming environment. To order a programming environment,
  > contact your Cray Research service representative or complete a software 
  > order form in the CRInform service.
  > 
  > Programming environment components discussed in this article are supported on 
  > Cray PVP systems that run the UNICOS 8.0 release or later and on Cray MPP 
  > systems that run both the UNICOS MAX 1.2.0.1 release or later and the 
  > UNICOS 8.0 release or later.
  > 
  > Note: You must install the CF77_M 6.2.1 compiling system and CrayLibs_M 1.2.2 
  > at the same time because dependencies exist between these products in the 
  > following shared array intrinsics, which are introduced for the first time in 
  > this release:
  > 
  >   PRESUM, PREPROD, PREMIN, and PREMAX parallel prefix operations 
  >   SCANNSUM, SCANPROD, SCANMIN, and SCANMAX segmented scan operations 
  > 
  > If programs that use these array intrinsics are compiled with CF77_M 6.2.1, 
  > you also must use CrayLibs_M 1.2.2 or later.
  > 
  > Enhancements
  > 
  > For both PVP and MPP systems, the libsci LAPACK libraries contain additional 
  > support for the following (LAPACK is a software package for solving linear 
  > systems and matrix eigenvalue problems):
  > 
  >   Factorization variant QR with pivoting 
  >   Linear least squares driver routines 
  >   Reductions to condensed form for eigenvalue computations 
  > 
  > The libraries also contain performance improvements to xLARTG and xLARFG, the 
  > auxiliary routines that generate elementary transformations.
  > 
  > For MPP systems, the programming environment 1.2.2 releases contain the 
  > following enhancements:
  > 
  >   Performance in the CF77_M compiling system was enhanced by adding 
  >   optimizations that improve cache performance for stack data. 
  >   Performance was enhanced for all MPP 1.2.2 programming environments 
  >   through optimizations that streamline inner loop computations. 
  >   The SHMEM_MY_PE() library routine, which returns the number of the 
  >   processor elements (PEs) executing, and the SHMEM_N_PES() library 
  >   routine, which returns the number of PEs available to the program, were 
  >   added. These routines are especially useful with the CF90 compiler, 
  >   which does not have intrinsics for this purpose. 
  >   Performance was improved in the SHMEM_GET library routine when transfer 
  >   sizes of one to three words are achieved. 
  >   Performance was improved for the Parallel Virtual Machine (PVM) global 
  >   operation function, pvm_reduce(). Previously, pvm_reduce() was layered 
  >   on the pvm_psend() and pvm_precv() functions, and it used the same 
  >   linear algorithm as is used in the public domain version of PVM. The 
  >   optimized version uses more direct shared memory and achieves more 
  >   logarithmic scaling. 
  >   The following Fortran shared array intrinsics were added: 
  >     PRESUM, PREPROD, PREMIN, and PREMAX parallel prefix operations 
  >     SCANNSUM, SCANPROD, SCANMIN, and SCANMAX segmented scan operations 
  > 
  > These intrinsic functions behave similarly to reduction functions, but 
  > partial results are retained in the result array. The segmented scan 
  > intrinsics also carry a mask of stop bits that tells the operation to stop 
  > and start over again.
  > 
  > Enhancements to the libsci libraries for Cray MPP systems include the 
  > following:
  >  
  >   The addition of an optimized implementation of ScaLAPACK, a set of 
  >   scalable algorithms for solving linear algebra problems. ScaLAPACK 
  >   contains several linear solvers, similarity and equivalence 
  >   reduction routines, and an Eigensystem solver for real symmetric 
  >   matrices. These algorithms use the Basic Linear Algebra Communication
  >   Subprograms (BLACS) for communication and the Parallel Basic Linear 
  >   Algebraic
  >   Subroutines (PBLAS) for computation. The PBLAS, new in this release, 
  >   provide distributed-memory software comparable to the BLAS in 
  >   shared-memory codes. 
  >   New Fast Fourier Transform (FFT) routines were added to perform 
  >   parallel 2-D and 3-D real-to-complex and complex-to-real FFTs. 
  >   The performance of the FFT subroutine, CCFFT, was improved for 
  >   prime-length vectors and for lengths that cannot be factored into 
  >   powers of 2, 3, and 5. The single-PE routines
  >   SCFFT and CSFFT have been extended to work with odd-length vectors. 
  >   Newly optimized versions of the following routines were added: 
  >   SNRM2, SCNRM2, SROTG, and CROTG from the Level 1 BLAS routines and 
  >   STRSM, STRMM, and the other Level 3 BLAS routines. 
  > 
  > Compatibilities issues
  > 
  > The user interface for loop unrolling in the CF77_M compiling system has 
  > changed. In previous releases, when a user specified the following, a total 
  > of 5 copies of the loop body were created; the original loop plus 4:
  >  
  > CDIR$ UNROLL [4]
  > 
  > This implementation was not compatible with the FPP implementation of the 
  > directive and was confusing to users. With this release, the previous example 
  > results in a total of 4 copies of the loop body; the original plus 3.
  > 
  > Documentation changes
  > 
  > In addition to numerous man pages updated for this release, the following 
  > manuals have also been updated:
  > 
  >   Cray MPP Fortran Reference Manual, publication SR-2504 6.2.2 (available 
  >   online in Docview form only) 
  >   Programming Environment Installation Guide, publication SG-5217 1.2.2 
  >   (available in printed form only)

One Year Anniversary of the ARSC T3D Newsletter

The first ARSC T3D Newsletter was mailed out on 8/25/94 and since then there have been 49 issues (almost weekly). I thought about providing an index but that would be a lot of work and would be incomplete no matter how much effort was put into it.

What has been useful for me is to accumulate all of the newsletters in a single directory (~.5MB) and when a query comes up I just grep for the keywords. With grep there is no need for an index.

PATP Meeting at JPL

This week Ming Jiang and I will be at the PATP Scientific Conference held at JPL, August 24th and 25th. I'll have details of that meeting in future newsletters.

List of Differences Between T3D and Y-MP

The current list of differences between the T3D and the Y-MP is:
  1. Data type sizes are not the same (Newsletter #5)
  2. Uninitialized variables are different (Newsletter #6)
  3. The effect of the -a static compiler switch (Newsletter #7)
  4. There is no GETENV on the T3D (Newsletter #8)
  5. Missing routine SMACH on T3D (Newsletter #9)
  6. Different Arithmetics (Newsletter #9)
  7. Different clock granularities for gettimeofday (Newsletter #11)
  8. Restrictions on record length for direct I/O files (Newsletter #19)
  9. Implied DO loop is not "vectorized" on the T3D (Newsletter #20)
  10. Missing Linpack and Eispack routines in libsci (Newsletter #25)
  11. F90 manual for Y-MP, no manual for T3D (Newsletter #31)
  12. RANF() and its manpage differ between machines (Newsletter #37)
  13. CRAY2IEG is available only on the Y-MP (Newsletter #40)
  14. Missing sort routines on the T3D (Newsletter #41)
I encourage users to e-mail in differences that they have found, so we all can benefit from each other's experience.
Current Editors:
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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