Friday, 29th March 2024

Comment posted How to find out which processes are causing a hard disk I/O overhead in GNU/Linux by .

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  1. Mark Seger says:
    Google Chrome 15.0.874.51 Google Chrome 15.0.874.51 Windows Vista Windows Vista
    Mozilla/5.0 (Windows NT 6.0) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.51 Safari/535.2

    Glad you’re finding collectl useful – have you tried the collectl-utils yet? Adds plotting and cluster-wide ‘top’ functionality for anything collectl can collect. a few comments:
    – collect is definitely in active development and current plans are to release a new version next week, the most noticeable addition being numa stats
    -it is currently included in fedora and suse and is being added to the next release of debian. but you can also install the rpm on any system that support rpm, OR just go with the source tarball and run INSTALL.
    – as for performance I can almost guarantee sar and systat are faster since they’re written in C and collectl is written in perl. My original plan was to write collectl in perl as a prototype but it’s so efficient that I don’t see any benefits in giving up the ease at which I can add additional capabilities to move to C or any other language

    As I’ve said before sar and iostat (and many others) are fine tools but I find them limiting in a variety ways including inconsistencies in their data reporting with each other as well as completeness in what they report – I want a single tool so ALL data can be recorded within microseconds of each other so one can observe how the system as a whole is behaving, especially in response to a problem.

    Another important thing is I’m on a mission to educate people to the harm in running sar at its default monitoring interval of 10 minutes. This is such a coarse measure as to be almost meaningless for diagnosing all but the most basic problems. Consider a 1 minute network spike on a moderately loaded network – you’ll never see it! Sar users: please lower your monitoring frequencies. A minute is far better than 10 but of course I’m a big advocate of collectl’s 10 second interval and there are a number of collectl users who choose even 5 or 1 second sampling rates. The more you collect the more you will see.

    -mark

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    • admin says:
      Epiphany 2.30.6 Epiphany 2.30.6 Debian GNU/Linux x64 Debian GNU/Linux x64
      Mozilla/5.0 (X11; U; Linux x86_64; en-us) AppleWebKit/531.2+ (KHTML, like Gecko) Version/5.0 Safari/531.2+ Debian/squeeze (2.30.6-1) Epiphany/2.30.6

      Hi Mark,

      I haven’t tried collectl-utils yet, I don’t see it as a package in my Debian it will be nice if it enters debian repos. I’ll have to take some time to install it from collectl’s site. I’m sick now and I’m not I don’t feel like testing anything. But really congrats, great job I liked your website a lot, also the concept behind collectl is great and I also like your writting style. Great that we have such a nice developers in the community.
      I’ll hope to be seeing you around, I know some of posts are very trivial and probably won’t hold interest to you as my knowledge on Linux programming is not that profound as yours.

      Again thanks for the info.

      Wish a lot of success with collectl development!

      Best!
      Georgi

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      • Mark Seger says:
        Google Chrome 19.0.1084.56 Google Chrome 19.0.1084.56 GNU/Linux x64 GNU/Linux x64
        Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5

        The good news is it is now currently in the debian release process. The other good news, which may not be obvious, is it you just grab and untar the src.gz tarball, cd to the directory and type ./INSTALL, it will figure out it’s debian and do the right things. In fact, that’s the way the debian install package is built. 😉
        -mark

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  2. Mark Seger says:
    Google Chrome 15.0.874.51 Google Chrome 15.0.874.51 Windows Vista Windows Vista
    Mozilla/5.0 (Windows NT 6.0) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.51 Safari/535.2

    don’t get too hung up on having a kit that has been supplied as part of a distro – lots of great stuff is not part of any distro, like collectl-utils (and collectl before that). Just unpack the tarball into /tmp and run INSTALL. very simple script and if you’re nervous, just manually run the few copy commands it runs.
    -mark

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