AIX Versions 3.2 and 4 Performance Tuning Guide

<BODY BGCOLOR="FCFBF0"> <CENTER> <FONT COLOR="#A62A2A" SIZE="+2"> </FONT> </CENTER> <HR> <H1><a href="edition.htm#A3C10D3F823mhay">Fifth Edition (April 1996) </a></H1> <H1><a href="trademar.htm#A2416DAE909bren">Trademarks and Acknowledgements</a></H1> <H1><a href="about.htm#D2B270A516wate">About This Book </a></H1> <H1><a href="concepts.htm#C0135C8182joy">Chapter 1. Performance Concepts</a></H1> <H2><a href="perftuni.htm#C0135CE952joy">An Introduction to the Performance-Tuning Process</a></H2> <H2><a href="benchmar.htm#DVrmm230mela">Performance Benchmarking-the Inevitable Dirtiness of Performance Data</a></H2> <H1><a href="resrcman.htm#Q2D2i380doug">Chapter 2. AIX Resource Management Overview</a></H1> <H2><a href="schedov.htm#A5Jgmi1fcwate">Performance Overview of the AIX CPU Scheduler</a></H2> <H2><a href="vmmov.htm#C0135A5557joy">Performance Overview of the Virtual Memory Manager (VMM)</a></H2> <H2><a href="fdiskman.htm#C0135AA659joy">Performance Overview of AIX Management of Fixed-Disk Storage</a></H2> <H1><a href="multipro.htm#fHumm3fmela">Chapter 3. An Introduction to Multiprocessing</a></H1> <H2><a href="smpcon.htm#a9vrj70wate">Symmetrical Multiprocessor (SMP) Concepts and Architecture</a></H2> <H2><a href="smpperfi.htm#cKumm2d9mela">SMP Performance Issues</a></H2> <H2><a href="smpenvir.htm#KLumm171mela">Adapting Programs to an SMP Environment</a></H2> <H2><a href="smpworkl.htm#cSumm171mela">SMP Workloads</a></H2> <H2><a href="smpsched.htm#ISummb8mela">SMP Scheduling</a></H2> <H2><a href="procaffi.htm#PWVxj1e9wate">Processor Affinity and Binding</a></H2> <H1><a href="perfplan.htm#D2B27E7505wate">Chapter 4. Performance-Conscious Planning, Design, and Implementation</a></H1> <H2><a href="desnimpl.htm#cfl8j390wate">Design and Implementation of Efficient Programs</a></H2> <H2><a href="perfinst.htm#Igl8j14fwate">Performance-Related Installation Guidelines</a></H2> <H1><a href="sysmonit.htm#D2B2818163wate">Chapter 5. System Monitoring and Initial Performance Diagnosis </a></H1> <H2><a href="contperf.htm#Z3m8j158wate">The Case for Continuous Performance Monitoring</a></H2> <H2><a href="perfmonu.htm#A74m8j2c7wate">Performance Monitoring Using iostat, netstat, vmstat</a></H2> <H1><a href="monntunc.htm#A5J98j33awate">Chapter 6. Monitoring and Tuning CPU Use</a></H1> <H2><a href="vmstatcp.htm#HjDAi32bwate">Using vmstat to Monitor CPU Use</a></H2> <H2><a href="measurcp.htm#w983jebwate">Using the time Command to Measure CPU Use</a></H2> <H2><a href="monitorc.htm#D2B2840812wate">Using xmperf to Monitor CPU Use</a></H2> <H2><a href="cpuinten.htm#M5B3j3c1wate">Using ps to Identify CPU-Intensive Programs</a></H2> <H2><a href="tprof4cp.htm#C01353B875joy">Using tprof to Analyze Programs for CPU Use</a></H2> <H2><a href="cntrlflw.htm#A6B3j1e1wate">Detailed Control Flow Analysis with stem</a></H2> <H2><a href="execfdpr.htm#pDWVj347wate">Restructuring Executables with fdpr</a></H2> <H2><a href="contend4.htm#pw98j20fwate">Controlling Contention for the CPU</a></H2> <H2><a href="schedtim.htm#aNY1j3e3wate">Modifying the Scheduler Time Slice</a></H2> <H2><a href="idadmin.htm#bf5Bjbbwate">CPU-Efficient User ID Administration</a></H2> <H1><a href="tuningme.htm#eAD2i2ddoug">Chapter 7. Monitoring and Tuning Memory Use</a></H1> <H2><a href="memoryus.htm#HhY1j39wate">How Much Memory Is Really Being Used?</a></H2> <H2><a href="membigfo.htm#xFPAj2d9wate">Analyzing Patterns of Memory Use with BigFoot</a></H2> <H2><a href="memrmss.htm#C01364F517joy">Assessing Memory Requirements via the rmss Command</a></H2> <H2><a href="vmmmemld.htm#C013656993joy">Tuning VMM Memory Load Control</a></H2> <H2><a href="vmmpage.htm#A3rA1j8wate">Tuning VMM Page Replacement</a></H2> <H1><a href="montundi.htm#UPD2i2f9doug">Chapter 8. Monitoring and Tuning Disk I/O</a></H1> <H2><a href="seqread.htm#DGV8j3bewate">Tuning Sequential Read Ahead</a></H2> <H2><a href="diskpace.htm#C013657651joy">Use of Disk-I/O Pacing</a></H2> <H2><a href="lvstrip.htm#D2B2891435wate">Logical Volume Striping</a></H2> <H2><a href="fragsize.htm#D2B2891675wate">File-System Fragment Size</a></H2> <H2><a href="compress.htm#A4lJIj264wate">Compression</a></H2> <H2><a href="asyncio.htm#olJIj343wate">Asynchronous Disk I/O</a></H2> <H2><a href="diskio.htm#D2B2892170wate">Using Raw Disk I/O</a></H2> <H2><a href="syncfsyn.htm#D2B2892761wate">Using Performance Implications of sync/fsync</a></H2> <H2><a href="scsiparm.htm#KdZRj37cwate">Modifying the SCSI Device Driver max_coalesce Parameter</a></H2> <H2><a href="scsiqueu.htm#SguOj98wate">Setting SCSI-Adapter and Disk-Device Queue Limits</a></H2> <H2><a href="syspbufs.htm#oA2fj1fbwate">Controlling the Number of System pbufs</a></H2> <H1><a href="montunco.htm#CD90F2F237wate">Chapter 9. Monitoring and Tuning Communications I/O</a></H1> <H2><a href="udptcppe.htm#CD90F2F335wate">UDP/TCP/IP Performance Overview</a></H2> <H2><a href="tcpudppe.htm#CD90F2F384wate">TCP and UDP Performance Tuning</a></H2> <H2><a href="mbufperf.htm#L1TAj35ewate">mbuf Pool Performance Tuning</a></H2> <H2><a href="mbuftunp.htm#CD90F30183wate">UDP, TCP/IP, and mbuf Tuning Parameters Summary</a></H2> <H2><a href="nfstunin.htm#CD90F31996wate">NFS Tuning</a></H2> <H2><a href="diskless.htm#CD90F35101wate">Serving Diskless Workstations</a></H2> <H2><a href="asynctun.htm#C013658783joy">Tuning Asynchronous Connections for High-Speed Transfers</a></H2> <H2><a href="netpmone.htm#wj5Dj27bwate">Using netpmon to Evaluate Network Performance</a></H2> <H2><a href="iptracea.htm#n2TAj95wate">Using iptrace to Analyze Performance Problems</a></H2> <H1><a href="dfsperft.htm#D2B2919340wate">Chapter 10. DFS Performance Tuning </a></H1> <H1><a href="tracefac.htm#C013834277joy">Chapter 11. Performance Analysis with the Trace Facility</a></H1> <H2><a href="tracefad.htm#cGGVi357cand">Understanding the Trace Facility</a></H2> <H2><a href="tracefae.htm#D2B2930240wate">An Example of Trace Facility Use</a></H2> <H2><a href="strtstpt.htm#C013835082joy">Starting and Controlling Trace from the Command Line</a></H2> <H2><a href="conttrac.htm#D2B2933491wate">Starting and Controlling Trace from a Program</a></H2> <H2><a href="addtrace.htm#C013837884joy">Adding New Trace Events</a></H2> <H1><a href="perfdiag.htm#CviJj2wate">Chapter 12. Performance Diagnostic Tool (PDT)</a></H1> <H2><a href="perftool.htm#D2B281B307wate">The AIX Performance Toolbox</a></H2> <H2><a href="perfprob.htm#F6m8j41wate">Inference from the Kind of Performance Problem Reported</a></H2> <H2><a href="useperfd.htm#x6m8j56wate">Using PerfPMR for Performance Diagnosis</a></H2> <H2><a href="idperfre.htm#C013538071joy">Identifying the Performance-Limiting Resource</a></H2> <H2><a href="workload.htm#D8m8j2ebwate">Workload Management</a></H2> <H1><a href="aixperfb.htm#eU68j370wate">Chapter 13. Handling a Possible AIX Performance Bug</a></H1> <H1><a href="perfmont.htm#A9DC8i25edoug">Appendix A. AIX Performance Monitoring and Tuning Commands</a></H1> <H2><a href="emstat.htm#A312emstatbkg">emstat Command</a></H2> <H2><a href="schedtun.htm#C01381E198joy">schedtune Command</a></H2> <H2><a href="vmtune.htm#hDEci3c8cand">vmtune Command</a></H2> <H2><a href="pdtconfi.htm#p8MJj252wate">pdt_config Script</a></H2> <H2><a href="pdtrepor.htm#X9MJj3d3wate">pdt_report Script</a></H2> <H1><a href="perfsubs.htm#I6SGi259doug">Appendix B. Performance-Related Subroutines</a></H1> <H1><a href="cacheadd.htm#C013792712joy">Appendix C. Cache and Addressing Considerations</a></H1> <H1><a href="useldcmd.htm#C013619081joy">Appendix D. Efficient Use of the ld Command</a></H1> <H1><a href="perftoom.htm#NXV8j377wate">Appendix E. Performance of the Performance Tools</a></H1> <H1><a href="memmanag.htm#C013609938joy">Appendix F. Application Memory Management-malloc and realloc</a></H1> <H1><a href="perfshar.htm#C0135FD988joy">Appendix G. Performance Effects of Shared Libraries</a></H1> <H1><a href="accproct.htm#C013759361joy">Appendix H. Accessing the Processor Timer</a></H1> <H1><a href="natlangs.htm#RSr8j1a4wate">Appendix I. National Language Support-Locale vs Speed</a></H1> <H1><a href="tunablea.htm#D2B2A1E557wate">Appendix J. Summary of Tunable AIX Parameters</a></H1>