IBM eServer Cluster 1600 Managed by PSSP 3.5: What's New

96 IBM ^ Cluster 1600 Managed by PSSP 3.5: What’s New

4.9.2 Parallel Environment

Parallel Environment (PE) has been enhanced with the introduction of three

APARs. For a detailed description of these features, refer to

IBM

^

Cluster

1600 and PSSP 3.4 Cluster Enhancements

, SG24-6604. The three APARs

delivered that extend the capability of this product are as follows:

򐂰 With APAR IY34726, PE is able to exploit the 64-bit kernel of AIX 5L Version

5.1.

򐂰 APAR IY32331 delivers enhanced support for technical large pages

introduced in AIX 5L Version 5.1 Maintenance Level 2.

򐂰 The communication over a two-plane SP Switch2 environment is supported

with APAR IY30344.

4.9.3 Engineering and Scientific Subroutine Library and Parallel

ESSL

Since its introduction in December 2001, Engineering and Scientific Subroutine

Library (ESSL) and Parallel ESSL have undergone further improvements to

exploit the new architecture of the pSeries p690/p670. Table 4-1 lists some of the

improvements to ESSL together with the required APARs.

Table 4-1 Improvements to ESSL functions

Note: The keyword is ignored if the ENFORCE_RESOURCE_USAGE

keyword is not set.

Note:

򐂰 MPI jobs can span PSSP 3.4 and PSSP 3.5.

򐂰 MPI jobs can run over mixed 32- and 64-bit AIX kernels. These nodes need

to be at PSSP 3.5.

򐂰 Stand-alone support for 64-bit systems is provided with APAR IY34726.

Functional enhancement APAR number

Improved DGEMM performance for small

matrix sizes on p690, p670, and p655

PQ57448

Improved selected Level 1 BLAS

performance on p690

PQ57481

Improved performance for DGEMV and

DGER for power of 2 LDA on p690

PQ57570

Chapter 4. Parallel System Support Program 3.5 enhancements 97

Table 4-2 lists an improvement to Parallel ESSL together with the required

APARs.

Table 4-2 Improvement to Parallel ESSL

Improved DTRMM performance for

special shaped problems

PQ57865

Improved performance on p690 PQ59873

Improved DAXPY full cache performance

on POWER4

PQ63403

Improved performance on POWER4 PQ63390

Improved FFT performance for small

lengths

PQ63401

Improved performance of Rank-K update

subroutines on POWER4

PQ67105

Improved performance of short precision

matrix add and subtract subroutines on

POWER4

PQ67112

Improved performance of CGEMM and

ZGEMM on POWER4

PQ67114

Functional enhancement APAR number

Improved SMP performance for PDCFT3

and PSCFT3

PQ59854

Note:

򐂰 IBM recommends use of the latest available levels for ESSL and Parallel

ESSL to fully exploit the speed and functionality of those libraries.

򐂰 For ESSL and Parallel ESSL, no explicit APAR is necessary for the support

of the 64-bit kernel.

򐂰 ESSL is now supported with AIX 5L Version 5.2.

Functional enhancement APAR number