A "sched/fair" change for Linux 5.20 aims to enhance the efficiency when searching for an idle CPU under heavy system load. The change led by Intel should improve the kernel's efficiency when the system is overloaded but as with most low-level tuning does run the risk of regressions. . Intel's Chen Yu worked out this new "SIS_UTIL" scheduler feature to search for an idle CPU based on the sum of the utilization average. This stems from finding that the kernel's select_idle_cpu() is too time consuming when looking for an idle CPU while the system is overloaded. The patch though did already yield a regression within the Stress-NG socket benchmark but is an area for further investigation. There was also a slight regression in at least one Hackbench test configuration. The link for this article located at Phoronix is no longer available. . Intel's latest SIS_UTIL task manager is designed to enhance CPU idle time detection during peak performance conditions. Explore the modifications.. Linux Scheduler, Performance Tuning, Intel SIS_UTIL, Idle CPU Searching. . LinuxSecurity.com Team
Out of the box, Linux runs just fine for many uses. But if you find yourself needing to ferret out performance problems or tune the kernel for better performance, Linux has more than enough tools to measure and tweak system performance. In this guide, we'll take a look at five of the best utilities to measure system performance and tweak the Linux kernel.. You'll find many, many, many utilities for measuring and improving Linux system performance. The utilities discussed here are chosen because they're widely available, and provide a good scope functionality. Also, I chose to avoid tools that have too steep a learning curve. As an example, SystemTap is a bit more complex than should be covered in an overview article. I left out some of the more basic tools such as ps and top because most Linux users are exposed to them fairly early on. And I didn't try to tackle any application-specific tools. This won't be the last word on system performance and administration on Linux.com, so don't worry. In future tutorials, I'll dive in a bit deeper with specific tools and tuning: but this should be a good starter kit for newer Linux admins. The link for this article located at Linux.com is no longer available. . Linux administrators can enhance system performance with tools like htop, iostat, and vmstat for monitoring and optimizing their environments effectively. Linux Performance Tools, System Monitoring Tools, Tuning Utilities. . LinuxSecurity.com Team
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