Red Hat Certified Specialist in Performance Tuning exam (EX442)

Course code: EX442

The Red Hat Certified Specialist in Performance Tuning exam (EX442) tests your ability to use standard system tools to analyze the performance of Red Hat® Enterprise Linux® and its applications. The offering also validates the knowledge needed to use standard system tools and mechanisms to modify the behavior of the system and applications to improve performance.

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Course dates

Starting date: Upon request

Type: Exam

Course duration: 1 day

Language: en

Price without VAT: 450 EUR


Type Course
Language Price without VAT
Upon request Exam 1 day en 450 EUR Register
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Course description

By passing this exam, you become a Red Hat Certified Specialist in Performance Tuning, which also counts toward becoming a Red Hat Certified Architect (RHCA).


Target group

  • Experienced Linux system administrators responsible for maximizing resource utilization through performance tuning
  • A Red Hat Certified Engineer (RHCE) interested in becoming a Red Hat Certified Architect (RHCA).

Course structure

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.


  • Be a Red Hat Certified System Architect (RHCSA) or have comparable work experience and skills (RHCE would be even better)
  • Take Red Hat Performance Tuning: Linux in Physical, Virtual, and Cloud (RH442) or have extensive work experience in performance tuning

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The training takes place in Bruselská 266/14 Prague 12000.

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