IBM ~pSeries High Performance Switch | IBM instruction

IBM ~pSeries

High Performance Switch

Tuning and Debug Guide

Version 1.0

April 2005

IBM Systems and Technology Group

Cluster Performance Department

Poughkeepsie, NY

Image 1

IBM manual IBM ~pSeries High Performance Switch

Contents

IBM ~pSeries High Performance Switch Contents Mpprintenv Mpstatistics Introduction MPI tunables for Parallel Environment Tunables and settings for switch softwareMpeagerlimit Mppollinginterval Memoryaffinity Mprexmitbufsize and Mprexmitbufcnt Mpcssinterrupt MptaskaffinityMPI-IO Chgsni command IP tunables Tunables and settings for AIX 5LFile cache Svmon and vmstat commands Vsid Esid Type Description LPage Inuse Pin Pgsp Virtual Svmon Pin Pgsp Virtual Vmstat Large page sizing Pshpstuningguidewp040105.doc Memory affinity for a single Lpar Large pages and IP supportAmount of memory available Daemon configuration Debug settings in the AIX 5L kernelRsct daemons Reducing the number of daemons running LoadLeveler daemonsReducing logging Placement of POE managers and LoadLeveler scheduler Settings for AIX 5L threadsAIX 5L mail, spool, and sync daemons Lsattr tuning Debug settings and data collection toolsDriverdebug setting Iptrclvl setting Deconfigured L3 cache Small Real Mode Address Region on HMC GUIService focal point Affinity LPARs HMC error logging Errpt commandMultiple versions of MPI libraries Mpprintenv Memoryaffinity Mpstatistics Dropped switch packets Nddipacketsmsw 0x00000000 Nddipacketslsw Packets dropped in the ML0 interface Packets dropped because of a hardware problem on an endpoint Mpinfolevel Packets dropped in the switch hardware Lapidebugperf Lapidebugcommtimeout Conclusions and summary AIX 5L trace for daemon activityAdditional reading HPS documentation MPI documentation POWER4AIX 5L performance guides IBM Redbooks Pshpstuningguidewp040105.doc