This system supports up to 4 SMT threads per processor. For example: $ lssrad -avĠ 94957.94 0-47 Simultaneous MultithreadingĬommand may be used to query and change CPUs' SMT mode: $ smtctl Query physical processor information: $ prtconfĬommand to display processor and memory layout. Query the default value of a parameter using no -L: $ no -L tcp_nodelayack To the running system and for subsequent reboots. Therefore, generally, both commands are run for each tunable to apply To persist the change across reboots, add the -rįlag: /usr/sbin/no -r -o tcp_nodelayack=1 To update a value until the next reboot, use -o, forĮxample: /usr/sbin/no -o tcp_nodelayack=1 DocumentationĬommand is used to query or set kernel parameters. Use profiling to evaluate the effects of tuning otherĪlso review the general topics in the Operating Systems chapter.For apps that make heavy use of native memory, experiment with and.For apps that use a lot of network I/O, tune networking.For large multi-threaded apps, use profiling to make sure that work.Find the optimal hardware prefetching setting for your. Find the optimal SMT configuration for the machine.Use MCM memory affinity where appropriate.Bind your processes properly based on system topology.If there are firewall idle timeouts between two hosts on a LAN.The configuration and whether or not resource allotments are changing If the operating system is running in a virtualized guest, review.Review snapshots of process activity, and for the largest users of.Review operating system logs for any errors, warnings, or high.Statistics should be periodically monitored and saved for historical Operating system level statistics and optionally process level.Threads on multi-processor nodes may avoid a network processingīottleneck with the default single-CPU interrupt processing model. In some situations, enabling network dog.Use netstat -v to ensure that network switches are not.Monitor for TCP retransmissions and test tuning TCP/IP network buffer sizes.Possible values to avoid TCP retransmits. Minimum and maximum buffers on all AIX LPARs (including VIO) to maximum If you're not tight on RAM, tune Virtual Ethernet Adapter.Saturated with computational memory and the operating system should not Generally, physical memory should never be.
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