Red Hat Certificate of Expertise in Performance Tuning exam (EX442)

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You should be able to perform the tasks listed below:

Use utilities to analyze system behavior

• Use utilities such as vmstat, iostat, mpstat, sar, gnome-system-monitor, top, powertop, and others to analyze and report system and application behavior
• Use utilities such as Performance Co-Pilot (PCP) to analyze system behaviour
• Use utilities such as dmesg, dmidecode, and sosreport to profile system hardware configurations

Monitor and alter kernel behavior

• Use /proc/sys, sysctl, and /sys to examine, modify, and set kernel run-time parameters
• Configure kernel behavior by altering module parameters

Analyze system and application performance

• Analyze system and application behavior using tools such as ps, top, and Valgrind
• Configure systems to run SystemTap scripts
• Use the eBPF family of tools (e.g. syscount, gethostlatency and others) to diagnose system and application behavior
• Given multiple versions of applications that perform the same or similar tasks, choose which version of the application to run on a system based on its observed performance characteristics

Tune running systems

• Alter process priorities of both new and existing processes
• Select and configure tuned profiles
• Manage system resource usage using control groups

Tune memory utilization

• Configure systems to support alternate page sizes for applications that use large amounts of memory

Configure disk and file subsystems

• Select proper I/O scheduling algorithm
• Tune file system layout for a given use

Tune network performance

• Calculate network buffer sizes based on known quantities such as bandwidth and round-trip time
• Set system buffer sizes based on those calculations

As with all Red Hat performance-based exams, configurations must persist after reboot without intervention.