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The "activity" trigger was inspired by the heartbeat one, but aims at providing instant indication of the immediate CPU usage. Under idle condition, it flashes 10ms every second. At 100% usage, it flashes 90ms every 100ms. The blinking frequency increases from 1 to 10 Hz until either the load is high enough to saturate one CPU core or 50% load is reached on a single-core system. Then past this point only the duty cycle increases from 10 to 90%. This results in a very visible activity reporting allowing one to immediately tell whether a machine is under load or not, making it quite suitable to be used in clusters. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.