IBM manual IBM ~pSeries High Performance Switch

Page 1

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

Contents IBM ~pSeries High Performance Switch Contents Mpprintenv Mpstatistics Introduction MPI tunables for Parallel Environment Tunables and settings for switch softwareMpeagerlimit MppollingintervalMemoryaffinity Mprexmitbufsize and MprexmitbufcntMpcssinterrupt 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 SvmonPin Pgsp Virtual VmstatLarge 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 settingDeconfigured L3 cache Small Real Mode Address Region on HMC GUIService focal point Affinity LPARsHMC error logging Errpt commandMultiple versions of MPI libraries Mpprintenv Memoryaffinity MpstatisticsDropped 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 hardwareLapidebugperf LapidebugcommtimeoutConclusions and summary AIX 5L trace for daemon activityAdditional reading HPS documentationMPI documentation POWER4AIX 5L performance guides IBM RedbooksPshpstuningguidewp040105.doc