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DEPENDENCIES Install the following packages to be able to build atop (package name can be different depending on the Linux distro): * zlib-devel or libz-dev or zlib1g-dev * ncurses-devel or libncurses5-dev/libncursesw5-dev Install the following packages to be able to execute atop (package name can be different depending on the Linux distro): * zlib or zlib1g * ncurses or libncurses5/libncursesw5 INSTALLING AND USING ATOP For interactive use, it is sufficient to install ATOP with the command (as root): make systemdinstall or make sysvinstall For automatic logging in compressed binary format, see the description in the manual-page. The kernel module 'netatop' can be downloaded and installed separately from www.atoptool.nl/downloadnetatop.php This module is optional and can be used to gather network statistics per process/thread as described in www.atoptool.nl/netatop.php KERNEL ISSUES WITH PROCESS ACCOUNTING ------------------------------------- Newer upstream kernels (e.g. 4.8 and 4.9) have two issuess with process accounting: 1) Sometimes process accounting does not work at all¹. Atopacctd tries to work around this issue, by retrying to initialize process accounting several times. 2) When using the NETLINK inface, the command TASKSTATS_CMD_GET consequently returns -EINVAL². Atopacctd needs NETLINK to be able to be triggered that some process in the system has finished. In this way, atopacctd can be in a blocking state as long as no processes terminate. When atopacctd detects that NETLINK fails, it switches into a polling mode to periodically try if it can read process accounting records as a workaround. This issue has to do with cpumasks and you can work-around it by building a kernel that has CONFIG_NR_CPUS configured to exactly the amount of CPUs (logical CPUs) in the system the kernel runs on. You can find this kernel option under "Processor type and features" --> "Maximum number of CPUs". [1] Bug 190271 - process accounting sometimes does not work https://bugzilla.kernel.org/show_bug.cgi?id=190271 [2] Bug 190711 - Process accounting: Using the NETLINK interface, the command TASKSTATS_CMD_GET returns -EINVAL https://bugzilla.kernel.org/show_bug.cgi?id=190711 Linux kernel mailing list thread: [REGRESSION] Two issues that prevent process accounting (taskstats) from working correctly https://lkml.org/lkml/2016/12/19/182 Gerlof Langeveld gerlof.langeveld@atoptool.nl
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