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marmistrz	2014-09-28 , 10:26
Posts: 3,328 \| Thanked: 4,476 times \| Joined on May 2011 @ Poland	#261

Show current shows a list of 3 swaps: one internal, 2 usd.

I agree that the banner about finishing is useful, but a banner can be easily missed when it comes to e.g. checking current write.

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Last edited by marmistrz; 2014-09-28 at 10:37.

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sixwheeledbeast	2014-09-29 , 17:34
Posts: 2,292 \| Thanked: 4,135 times \| Joined on Apr 2010 @ UK	#262

Originally Posted by marmistrz

Show current shows a list of 3 swaps: one internal, 2 usd.

Hmm, I am still not sure how that has happened.

Have you modified your upstart or sysytem-services at all?
Does the file /etc/event.d/relocateswap exist?

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marmistrz	2014-09-29 , 18:02
Posts: 3,328 \| Thanked: 4,476 times \| Joined on May 2011 @ Poland	#263

Originally Posted by sixwheeledbeast

Hmm, I am still not sure how that has happened.

Have you modified your upstart or sysytem-services at all?
Does the file /etc/event.d/relocateswap exist?

I guess no. I probably reflashed the phone after this. But there's a faint possibility that I purged and reinstalled system-services because of problems with ereswap. I don't have ereswap installed now and rcS-late doesn't have ereswap modifications.

Yes it exists and `sudo start relocateswap` does what it should

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sixwheeledbeast	2014-09-29 , 18:32
Posts: 2,292 \| Thanked: 4,135 times \| Joined on Apr 2010 @ UK	#264

Quick reply.....

Originally Posted by marmistrz

Yes it exists and `sudo start relocateswap` does what it should

What are the permissions for relocateswap?

Code:

ls -la /etc/event.d/relocateswap

When I get a moment I will remove, purge and reinstall flopswap to make sure I can't reproduce this.

If it exists and works then I can only assume it is something else in the boot process.

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marmistrz	2014-09-29 , 18:42
Posts: 3,328 \| Thanked: 4,476 times \| Joined on May 2011 @ Poland	#265

Originally Posted by sixwheeledbeast

Quick reply.....

What are the permissions for relocateswap?
Code:
ls -la /etc/event.d/relocateswap
When I get a moment I will remove, purge and reinstall flopswap to make sure I can't reproduce this.

If it exists and works then I can only assume it is something else in the boot process.

Code:

 -rwxr-xr-x    1 root     root          1785 Sep 24 09:24 /etc/event.d/relocateswap

So I'll try purging flopswap and reinstalling it and then I'll add something to debug to the relocateswap script.

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sixwheeledbeast	2014-10-16 , 21:36
Posts: 2,292 \| Thanked: 4,135 times \| Joined on Apr 2010 @ UK	#266

Flopswap 0.1.10 uploaded to extras-devel

* Minor fixes to some scripts
* Switch to external swap on boot enabled as default
* Busy indication
* Check status on start option (thanks pichlo)

Originally Posted by marmistrz

could you show a busy indicator while the scripts are running (e.g. swap is being flopped) and, even better, gray out the 4 buttons while flopswap is busy?

As you can see I have included busy indication exactly as above into Flopswap. This was a good idea and makes the application look like it's doing something while switching.

Also thanks to pichlo for his guidance on my startup check code.

I am still working on outputting the current status somehow.
For now checkout "cat /tmp/flopswapcur"

As always let me know if you have any issues, enjoy.

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malfunctioning	2014-10-20 , 17:12
Posts: 330 \| Thanked: 556 times \| Joined on Oct 2012	#267

Thank you for your work, sixwheeledbeast.

I am seeing an issue in FlopSwap 0.1.9 and I didn't see this reported in the thread.

When I look in Check Status, I'm getting 7Mb out of 770Mb used. However, the free command reports almost 70Mb of swap space used (a factor of 10 larger).

Is this known? And, would it affect when the swap switch takes place, since it is set to kick in at a specific percentage of swap use?

My setup is with 2 Linux Swap partitions in microSD, and everything seems to be fine otherwise.

Also, quick question: Does the geometry/block size of the swap partition affect these calculations?

Last edited by malfunctioning; 2014-10-20 at 17:18.

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sixwheeledbeast	2014-10-20 , 17:37
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Originally Posted by malfunctioning

Thank you for your work, sixwheeledbeast.

No, thank you for the feedback.

Originally Posted by malfunctioning

When I look in Check Status, I'm getting 7Mb out of 770Mb used. However, the free command reports almost 70Mb of swap space used (a factor of 10 larger).

Is this known?

free is not equal to flopswap's values.
You see flopswap is measuring the fresh (clean) swap that has been written not the amount in use.

To make this clear in an example, when flopswap hits 100% it doesn't mean you have no swap left, it means you have no "fresh" swap left and you may now see the slowing effect of swap fragmentation.

Originally Posted by malfunctioning

would it affect when the swap switch takes place, since it is set to kick in at a specific percentage of swap use?

Swap switching is not done automatically. You maybe in the middle of a task when you reach your switching threshold. You don't want flopswap to be memory thrashing then

This would also require having a daemon running all the time, which I didn't want.
To refresh your swap manually you need to press the Fresh Swap button.

For automatic switching I recommend setting up a cronjob early in the morning while your asleep.
See the wiki page for more details on this.
http://wiki.maemo.org/Flopswap

Originally Posted by malfunctioning

Does the geometry/block size of the swap partition affect these calculations?

Flopswap knows how large your current uSD swap space is and uses this value for the percentage. This is why two equal size uSD swaps is recommended.

Last edited by sixwheeledbeast; 2014-10-21 at 14:39.

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misiak	2014-10-20 , 17:54
Posts: 805 \| Thanked: 1,605 times \| Joined on Feb 2010 @ Gdynia, Poland	#269

Originally Posted by sixwheeledbeast

free is not equal to flopswap's values.
You see flopswap is measuring the fresh (clean) swap that has been written not the amount in use.

To make this clear in an example, when flopswap hits 100% it doesn't mean you have no swap left, it means you have no "fresh" swap left and you may now see the slowing effect of swap fragmentation.

This still smells fishy... If N900 uses 70mb of swap (example from above malfunctioning's post), then even after reswaping, right at the beginning, the amount of used swap (in your application) should show no less then 70 mb, right? (I understand that these number can be different, but I don't understand how value reported by flopswap could be lower then value reported by free - I undestand it that this must be always true: value_reported_by_free <= value_reported_by_flopswap)

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malfunctioning	2014-10-20 , 18:35
Posts: 330 \| Thanked: 556 times \| Joined on Oct 2012	#270

Originally Posted by sixwheeledbeast

free is not equal to flopswap's values.
You see flopswap is measuring the fresh (clean) swap that has been written not the amount in use.

To make this clear in an example, when flopswap hits 100% it doesn't mean you have no swap left, it means you have no "fresh" swap left and you may now see the slowing effect of swap fragmentation.

Thank you for your explanations, sixwheeledbeast.

Everything makes sense and is clear, except the objection misiak proposed (I actually thought about this before I even saw his response

).

It seems (at first sight, anyway) that the percentage of fresh swap remaining should be <= the total amount of swap space remaining reported by free.

But I'm sure I'm wrong and you will clarify things.

EDIT: One way I see this being possible is if the way FlopSwap works is by partitioning the swap space. So you might keep internally a cursor where you start writing sequentially (which is set for example when you make a fresh swap), but which is different of how free swap space is calculated by the free command.

Just speculating.

Last edited by malfunctioning; 2014-10-20 at 18:47.