Date: Fri, 19 Aug 2016 10:40:58 +0100 From: Steve O'Hara-Smith <steve@sohara.org> To: freebsd-questions@freebsd.org Subject: Re: How do I limit I/O usage for a user/process? A user broke my system Message-ID: <20160819104058.1c60a63fb832fbdc1524207c@sohara.org> In-Reply-To: <CAM4nNt8dOojYNA6FK6_zj7vN92e6ML2A0QbsXH3fz8rP%2BCbVTg@mail.gmail.com> References: <CAM4nNt8dOojYNA6FK6_zj7vN92e6ML2A0QbsXH3fz8rP%2BCbVTg@mail.gmail.com>
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On Fri, 19 Aug 2016 09:23:16 +0000 Magnus Ahriman <magnus.ahriman@gmail.com> wrote: > Hi, > > Today I had a user who decided to open a very large text file in pico. The > result was a complete denial of service of the system and everything > stalled/was working veeeeery slowly. How much memory have you got on that box, and how much is in use normally ? It sounds like the system got pushed into swapping by opening that file. > Even after the user had killed the process it took quite some while for > the system to recover and I seemed to notice improvements of certain > services after having restarted them. > > What are my options to limit resource usage for users? I tried renicing Take a look at login.conf it lets you define many limits by login class - you can assign users to classes using vipw or chpass and of course with adduser when adding new users. > the user's process but to no help and the problem was most certainly with > disk I/O. I don't want a normal user being able to lock up my entire > system just by viewing text files. So any ideas? Very likely the problem was due to memory use and you are tight on memory for your normal load. -- Steve O'Hara-Smith <steve@sohara.org>
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