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Appendix B. Glossary 115
Non-malleable Non-malleable programs are fixed at compile time to
run on a specific number of processors.
NQE Network Queueing Environment, the batch queuing
system on the T3E.
PBLAS Parallel BLAS, parallelized version of BLAS.
PDF Portable Document Format, a format defining the final
layout of a document. The native file format for the
Adobe Acrobat software package.
PE Processing Element, consisting of a microprocessor,
local memory and support circuitry.
PostScript A widespread page description and printer language.
PVM Parallel Virtual Machine, a standardized and portable
message-passing library that is somewhat older than
MPI.
RISC Reduced Instruction Set Computer, a processor whose
design is based on the rapid execution of a sequence
of simple instructions rather than on a large variety
of complex instructions.
Scalability A measure of how efficiently a parallel program will
work when the number of processors is increased.
ScaLAPACK Scalable LAPACK, parallelized version of LAPACK.
SHMEM Shared Memory Library, Cray’s data-passing library.
SIMD Single Instruction, Multiple Data, a parallel computer
architecture or programming style where many func-
tional units perform the same operations on different
data.
Ssh Secure Shell, a program for encrypted communication
between two hosts over an insecure network.
Streams Stream buffers, a mechanism to fetch data in advance
from the local memory of the T3E PEs.
Unix The most widely used multi-user general-purpose op-
erating system in the world.
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