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Thread: Improve (potentially halve) login time by using readahead

  1. #111
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    Re: Improve (potentially halve) login time by using readahead

    Oh, question - I use autologin. Will this work with it?

  2. #112
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    Ubuntu 10.04 Lucid Lynx

    Re: Improve (potentially halve) login time by using readahead

    Quote Originally Posted by Vadi View Post
    Oh, question - I use autologin. Will this work with it?
    yeah, it should still save you login time compared to a normal login the same way that the readahead at boot saves you time when you slurp up all the data in order beforehands rather than thrashing all over the disk as you suddenly realize you need to read a certain file to boot.

    The BIGGEST time saving is realized when the system waits for the user to type in their password while in the background we can effectively pre-load their GNOME session from disk. But even without this advantage you should still shave a few seconds off login time.
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  3. #113
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    Dec 2007
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    Ubuntu 10.04 Lucid Lynx

    Re: Improve (potentially halve) login time by using readahead

    I tried it.

    I'm not sure if it worked though. I didn't notice a major difference in startup time, and the /.readahead directory is empty.

    what's going on? I'm still at 1:15 from grub to the stoppage of disk usage. (I think that's what you'd call it...)

  4. #114
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    Re: Improve (potentially halve) login time by using readahead

    Thanks jdong, it is a great howto! I applied it to my / and to my /home - I saved approx. 20 secs to use my computer! Keep up the good work!
    Being a target means being on the internet. End of line.
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  5. #115
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    Re: Improve (potentially halve) login time by using readahead

    this worked for me when my whole system[/ and /home] was in the same partition>
    http://ubuntuforums.org/showpost.php...9&postcount=97
    it had reduced my BOOT time by 25secs....

    BUT after i separated the / and /home partitions it worsens my boot times!!!
    it takes 1:35 mins for me to use the system from the time i switch it on! i have autologin so didnt check the times till the loginwindow and after... is 1:35 mins a reasonable time for startup?
    this happened in 8.04 itself... even after i have reinstalled 8.10 it seems to make my boots worse!

    Code:
    sudo readahead-watch -o ~/.readahead/gnome.root /
    sudo killall readahead-watch
    sudo chown macvr:macvr ~/.readahead -R
    sudo readahead-watch -o ~/.readahead/gnome.home /home
    sudo killall readahead-watch
    sudo chown macvr:macvr ~/.readahead -R
    i know tht i have done chown twice! thought it might help !

    i have removed the bigger files from the list , also added the 00readahead file... and also in the rc.local...

    but nothing seems to help...! have i done it correctly?

    anyway to make this work AGAIN ? previously it had reduced my boottimes but i dont understand why it worsens things now!
    Last edited by macvr; January 18th, 2009 at 07:35 AM.

  6. #116
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    Re: Improve (potentially halve) login time by using readahead

    Hmm, I have a separate /home/ partition and that doesn't seem to affect anything. Boot time is improved relative to no read-ahead. And did you logout before starting readahead-watch the second time?

  7. #117
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    Re: Improve (potentially halve) login time by using readahead

    Quote Originally Posted by Ng Oon-Ee View Post
    Hmm, I have a separate /home/ partition and that doesn't seem to affect anything. Boot time is improved relative to no read-ahead. And did you logout before starting readahead-watch the second time?
    previously i did logout of the session , but not in the terminal... so this is what i'v done again...
    Code:
    mkdir ~/.readahead
    sudo readahead-watch -o ~/.readahead/gnome.root /
    sudo killall readahead-watch
    sudo chown macvr:macvr ~/.readahead -R
    logout
    
    sudo readahead-watch -o ~/.readahead/gnome.home /home
    sudo killall readahead-watch
    sudo chown macvr:macvr ~/.readahead -R
    but my login time stays at 24secs both before and after i do this but the boot time worsens!

    i'v tried using the part three of the guide too, but no use!
    guess i'm one of the UNlucky ones!
    Last edited by macvr; January 18th, 2009 at 07:35 AM.

  8. #118
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    Re: Improve (potentially halve) login time by using readahead

    ok... i'v done more googling and split the boot times

    my total boot time from switching on is 1min35secs

    till end of grub options:12s
    boot according to bootchart:38s
    ??????????????:21s< this increases when i use readahead
    login after a logout:24 secs

    ok, i'm just a noob but this may be a silly question !
    why is there a gap of 21s? what happens during that time? its is this time which increases when i use the readahead

    could someone look at the bootchart and check if anything can be improved?

    is this bootup time normal ? its just that i hear startup times of 33 secs i'm wondering if my settings are correct!
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  9. #119
    Join Date
    Jul 2007
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    South San Francisco, CA
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    Ubuntu 12.04 Precise Pangolin

    Re: Improve (potentially halve) login time by using readahead

    Quote Originally Posted by jdong View Post
    It took some tweaking, both stripping things out of rcS/rc2, disabling a good chunk of restricted modules, and then streamlining the login process to load fewer things by default.

    But yeah, I can go from GRUB to a full desktop in just a tad over 20s
    Jdong, could you post some specifics on the stripping, disabling, and streamlining that you did?

    I have a slew of HP mini 1000's that I'm trying to optimize. They'll be used to connect via aircard to the internet for online charting by my nurses.

    So obviously, I'd like them to be running as fast as possible.

  10. #120
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    Re: Improve (potentially halve) login time by using readahead

    if I use the script "00readahead" provided by Pat Double I get empty ~/.readahead directory.
    if I go "by the book (jdong)" I get gnome.root filled.
    if I use jdong's recipe and fill the gnome.root, subsequent use of pat's script (with "profile") erases gnome.root and does not create a new one. I get empty .readahead directory.
    so, I'm having trouble with pat's script. what am I doing wrong?
    Last edited by zika; January 21st, 2009 at 06:15 PM.

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