IBM pSeries - Manual

IBM pSeries

IBM pSeries – Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.

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Table of Contents:

  • Page 5 – Tunables and settings for switch software
  • Page 9 – Tunables and settings for AIX 5L; Parameter; ipforwarding 1
  • Page 10 – svmon and vmstat commands
  • Page 13 – place. In that case, it is a good idea to run the svmon command; Large page sizing
  • Page 15 – Large pages and IP support
  • Page 16 – Debug settings in the AIX 5L kernel
  • Page 17 – LoadLeveler daemons; Reducing the number of daemons running
  • Page 18 – Settings for AIX 5L threads
  • Page 19 – Debug settings and data collection tools; CPUs and frequency
  • Page 20 – Small Real Mode Address Region on HMC GUI; Physical Real Memory; Deconfigured L3 cache; Service focal point
  • Page 21 – HMC error logging; If the lsswtopol command calls out links as ”; Multiple versions of MPI libraries
  • Page 24 – Dropped switch packets
  • Page 26 – Packets dropped in the ML0 interface
  • Page 28 – Packets dropped in the switch hardware
  • Page 30 – AIX 5L trace for daemon activity
  • Page 31 – MPI documentation
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IBM

~

pSeries

High Performance Switch

Tuning and Debug Guide

Version 1.0

April 2005




IBM Systems and Technology Group

Cluster Performance Department

Poughkeepsie, NY



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Summary

Page 5 - Tunables and settings for switch software

pshpstuningguidewp040105.doc Page 5 2.0 Tunables and settings for switch software To optimize the HPS, you can set shell variables for Parallel Environment MPI-based workloads and for IP-based workloads. This section reviews the shell variables that are most often used for performance tuning. For a ...

Page 9 - Tunables and settings for AIX 5L; Parameter; ipforwarding 1

pshpstuningguidewp040105.doc Page 9 rfifosize 0x1000000 receive fifo size False rpoolsize 0x02000000 IP receive pool size True spoolsize 0x02000000 IP send pool size True 3.0 Tunables and settings for AIX 5L Several settings in AIX 5L impact the performance of the HPS. These include the IP and memor...

Page 10 - svmon and vmstat commands

pshpstuningguidewp040105.doc Page 10 The overhead in maintaining the file cache can impact the performance of large parallel applications. Much of the overhead is associated with the sync() system call (by default, run every minute from the syncd daemon). The sync() system call scans all of the page...

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