maemo.org - Talk - [announce] swappolube to lubricate your gui

I run a cronjob that drops buffer cache containing pagecache, dentries and inodes, to clear out unused dirty pages (sync; echo 3 > /proc/sys/vm/drop_caches).

This might take some time and resources to run, since there's a sync command which writes down to the flash memory.
Given that we haven't cron by default on our devices, and I don't know how to mess with the alarmd daemon (and I'm not sure I'll ever do), I would then add an icon to run the command and free memory when the user likes to, i.e. when the device isn't going to do critical things like answering a call or shooting a video.

What do you think? Button or alarmd?

I definitely like the idea of a button if I have to choose one, but I can see both being the most useful :p

P@t	2010-09-16 13:27

Re: [announce] swappolube to lubricate your gui

Adding my thanks too

But I have noticed that at least some of the parameters do not survive a reboot?! While it seems that it should.

kaos_king

2010-09-16 14:10

Re: [announce] swappolube to lubricate your gui

This certainly seems to have speeded things up.

Not rebooted as of yet though.

debernardis

2010-09-16 14:15

Re: [announce] swappolube to lubricate your gui

Quote:

Originally Posted by P@t (Post 817878)

Adding my thanks too

But I have noticed that at least some of the parameters do not survive a reboot?! While it seems that it should.

Please control that it has installed a /etc/event.d/tuning file

gazza_d

2010-09-16 14:20

Re: [announce] swappolube to lubricate your gui

Quote:

Originally Posted by debernardis;817524
Concerning this issue, I want to implement the small memory-freeing command that Simon describes in his blog post, saying he runs it as a cron job.

[code

I run a cronjob that drops buffer cache containing pagecache, dentries and inodes, to clear out unused dirty pages (sync; echo 3 > /proc/sys/vm/drop_caches).[/code]

This might take some time and resources to run, since there's a sync command which writes down to the flash memory.
Given that we haven't cron by default on our devices, and I don't know how to mess with the alarmd daemon (and I'm not sure I'll ever do), I would then add an icon to run the command and free memory when the user likes to, i.e. when the device isn't going to do critical things like answering a call or shooting a video.

What do you think? Button or alarmd?

I'm greedy, and would like to see both! The ability to have a "garbage collector" running automatically would be great.

Would an good idea be to spin this off and merge with the optimizeN900 thread.

There does seem to be a multitude of different threads each offering different parts of the jigsaw which is N900 optimisation.

P@t	2010-09-16 14:29

Re: [announce] swappolube to lubricate your gui

Quote:

Originally Posted by debernardis (Post 817914)

Please control that it has installed a /etc/event.d/tuning file

I have the file 'tuning' and I can read the same values as in your first post.
However when I reboot, I can read for example:
40 for for the parameter dirty_ratio
while it should be 95

If I launch again the DEB, then the parameters turn to be at the correct values.

PS: some weeks ago I had modified the rcS file and did change the parameters of swappiness and page-cluster directly in the file. Could that be related? (I have serious doubt but...)

kaos_king

2010-09-16 14:40

Re: [announce] swappolube to lubricate your gui

Quote:

Originally Posted by P@t (Post 817925)

I can confirm this too, and it doesnt seem to matter what method reboot is used it always resets. Ive not tested any other figures than the dirty_ratio one as im at work (and supposed to be doing just that).

I doubt you manually changing the swappiness and page cluster made a difference, as I never have changed them and im getting it. I'd expect everyone would be the same?

debernardis

2010-09-16 14:43

Re: [announce] swappolube to lubricate your gui

@P@t: you're right. Both dirty_ratio and dirty_background_ratio don't get saved. I'm going to try to see why :)

kaos_king

2010-09-16 14:48

Re: [announce] swappolube to lubricate your gui

Quote:

Originally Posted by debernardis (Post 817940)

@P@t: you're right. Both dirty_ratio and dirty_background_ratio don't get saved. I'm going to try to see why :)

Thanks for packaging it together. Really does seem snappier, and that was before I OC'd it after a reboot. It was so snappy, i thought i HAD OC'd it!

Would be good to get it to survive a reboot :D

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