IBM pSeries - page 32

pshpstuningguidew p040105.doc Page 32

© IBM Corporation 2005

IBM Corporation

Marketing Communications

Systems Group

Route 100

Somers, New York 10589

Produced in the United States of America

April 2005

All Rights Reserved

This document was developed for products

and/or services offered in the United States.

IBM may not offer the products, features, or

services discussed in this document in other

countries.

The information may be subject to change

without notice. Consult your local IBM

business contact for information on the

products, features and services available in

your area.

All statements regarding IBM’s future

directions and intent are subject to change or

withdrawal without notice and represent goals

and objectives only.

IBM, the IBM logo, , AIX 5L,

LoadLeveler, POWER4, POWER4+, pSeries

and Redbooks are trademarks or registered

trademarks of International Business

Machines Corporation in the United States or

other countries or both. A full list of U.S.

trademarks owned by IBM may be found at

http://www.ibm.com/legal/copytrade.shtml.

Other company, product, and service names

may be trademarks or service marks of others.

IBM hardware products are manufactured

from new parts, or new and used parts.

Regardless, our warranty terms apply.

Copying or downloading the images contained

in this document is expressly prohibited

without the written consent of IBM.

This equipment is subject to FCC rules. It will

comply with the appropriate FCC rules before

final delivery to the buyer.

Information concerning non-IBM products was

obtained from the suppliers of these products

or other public sources. Questions on the

capabilities of the non-IBM products should be

addressed with the suppliers.

All performance information was determined i n

a controlled environment. Actual results m ay

vary. Performance information is provided

“AS IS” and no warranties or guarantees are

expressed or implied by IBM.

The IBM home page on the Internet can be

found at http://www.ibm.com.

The pSeries home page on the Internet can be

found at

http://www.ibm.com/servers/eserver/pseries.

Contents

Main IBM ~ pSeries High Performance Switch Contents Page 1.0 Introduction 2.0 Tunables and settings for switch software 2.1 MPI tunables for Parallel Environment 2.1.1 MP_EAGER_LIMIT 2.1.2 MP_POLLING_INTERVAL and MP_RETRANSMIT_INTERVAL 2.1.3 MP_REXMIT_BUF_SIZE and MP_REXMIT_BUF_CNT 2.1.4 MEMORY_AFFINITY 2.1.5 MP_TASK_AFFINITY 2.1.6 MP_CSS_INTERRUPT 2.2 MPI-IO 2.3 chgsni command 3.0 Tunables and settings for AIX 5L 3.1 IP tunables 3.2 File cache 3.3 svmon and vmstat commands 3.3.1 svmon 3.3.2 vmstat 3.4 Large page sizing Page 3.5 Large pages and IP support 3.6 Memory affinity for a single LPAR 3.7 Amount of memory available 3.8 Debug settings in the AIX 5L kernel 4.0 Daemon configuration 4.1 RSCT daemons 4.2 LoadLeveler daemons 4.2.1 Reducing the number of daemons running 4.2.2 Reducing daemon communication and placing daemons on a switch 4.2.3 Reducing logging 4.3 Settings for AIX 5L threads 4.4 AIX 5L mail, spool, and sync daemons 4.5 Placement of POE managers and LoadLeveler scheduler 5.0 Debug settings and data collection tools 5.1 lsattr tuning driver_debug 0 ip_trc_lvl 0x1111 5.1.1 driver_debug setting 5.3 Affinity LPARs 5.4 Small Real Mode Address Region on HMC GUI 64GB 61.5GB 128GB 120GB 256GB 240GB 512GB 495GB 5.5 Deconfigured L3 cache 5.7 errpt command 5.8 HMC error logging 5.9 Multiple versions of MPI libraries 5.10 MP_PRINTENV 5.11 MP_STATISTICS 5.12 Dropped switch packets 5.12.1 Packets dropped because of a software problem on an endpoint Page 5.12.2 Packets dropped in the ML0 interface 5.12.3 Packets dropped because of a hardware problem on an endpoint 5.12.4 Packets dropped in the switch hardware 5.13 MP_INFOLEVEL 5.14 LAPI_DEBUG_COMM_TIMEOUT 5.15 LAPI_DEBUG_PERF 5.16 AIX 5L trace for daemon activity 6.0 Conclusions and summary 7.0 Additional reading 7.1 HPS documentation