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Can you change the swap size and the other while in an ROM or do you need to do it in the recovery console and then reflash your ROM?
** Just changed all my setting for swap of 96 MB. ITS SO SUPER FAST ITS UNBELIVEABLE!!!!
I don't think you need to reflash if you can replace the swap partition without affecting the others.
What I mean is I left free space on the end of my SD card so I could experiment with different swap sizes. I've been using 40 on Drizzy Personal V3 but I'm going to try 96 now and see if I notice a difference.
Thank you so much. I gave up on the Hero roms after 1 day due to the lag. Now I am running a 96 mb swap and couldn't be happier!
You should add how to create a swap partition and also how to use Compcache as it could be very helpful. Other than that this looks pretty helpful. I also dont see the need for linux swap in any CM mod since they are very stable and are very smooth. It is an option, but i dont think its at all necessary...
EDIT: Also add how to change swapiness manualy . That would be very helpful...
wow... yha, so like um... well its totaly... like ...you know... ok..? ok
that was like trying to folow a bad paulie shore movie... ( like there were good ones)
+1 for write up on how to set-up and run swap (preferrably for dummies and n00bs)
i updated the thread with how to partition your sd whatever
but
im working on the command for terminal to set swappiness
because i used adb to push a user.conf
learned it~many thanks~and howabout 128M?and how much perfect swapiness value for 96m is?
Ayerwin said:
learned it~many thanks~and howabout 128M?and how much perfect swapiness value for 96m is?
Click to expand...
Click to collapse
128 is not good
i really didnt like its overall performamnce
oh and for 96 i use 60 for swappiness
????
i get the swapper some one asked if you could just change the file size with out reformating ill prolly reformat just to make a clean hero build the other ? is when you set 96 what do u mean by 60 isnt the whole 96 being used?
frost785 said:
i get the swapper some one asked if you could just change the file size with out reformating ill prolly reformat just to make a clean hero build the other ? is when you set 96 what do u mean by 60 isnt the whole 96 being used?
Click to expand...
Click to collapse
Well if you you instsll any build the settings on that build are default "i think"
32 swapiness or 20 cant remember and what want to do is set it to 60 so it wont lag and is faster
cuz if you leave it on 32/96 it gets laggy but with 60/96 its the "sweet spot"
jf4888 said:
128 is not good
i really didnt like its overall performamnce
oh and for 96 i use 60 for swappiness
Click to expand...
Click to collapse
thx sir,i'll try it with v4hero this weekend hah
more ?
ok then i must not get it i know how to change the partition format thats basic but how do i change the swappiness i know they have a program on the market but that doest do it befor start up after is this. sh /system/bin/swap -s i know this is the comand but not sure where to enter it and does it auto give me my default swapness thanks for your help ill keep reading
thanks jf4888, your tutorial helped me more the the other ones.
force closes
I get plenty of force closes with CM's 4.01. I have compcache. My brother did the linux-swap and said it's been so much better. Some people say CM's rom doesn't need swap??? That boggles my mind. I love his roms and get less force closes than JF, but it's far from perfect when force closes are involved.
you might want to include how to update your ext3 to ext4 for those that so desire it. other than that, great guide.
frost785 said:
ok then i must not get it i know how to change the partition format thats basic but how do i change the swappiness i know they have a program on the market but that doest do it befor start up after is this. sh /system/bin/swap -s i know this is the comand but not sure where to enter it and does it auto give me my default swapness thanks for your help ill keep reading
Click to expand...
Click to collapse
i put up the command to set swap through terminal it should work considering i tried it myself
usernam3 said:
thanks jf4888, your tutorial helped me more the the other ones.
Click to expand...
Click to collapse
Here welcome
Oh and for now on start directing people to
The ultimate newb thread
Its a wip(work in progress)
And we hope for it to become a sticky so others
When they have a problem with anything
And I mean anything can go there and have any question answered
install swap partition without formatting whole sd?
Thanks for the great guide. Noob here I already formtted my sd card and have apps2sd etc but would like to create a swap partition (running cyonogen 4.0.1 with ext2, ext3)
Is there a way to create a swap partition without having to format the whole sd and recreating ext2 and 3?
ok so i made a linux-swap partion on my sd card that is 64mb. Now do i need to activate it somehow? or does cynogen do it for me? i tried to search but couldnt find. also do i need update my radio? it is 2.22.19.26I
You need user.conf and userinit.sh files on your ext partition. There's a guide on how to set that up here.
ok and can i have compcache and linux-swap at the same time? or do they do the same thing? also do i need to make a partion for compcache? and i cant find the htc keyboard in 4.2.3.1, does it come with it?
i thought if you have 4.2.3.1 you didnt have to add the files as it does everything for you? am I missing something.
is compcache and linux swap the same thing? and do we need both?
nahanee20 said:
is compcache and linux swap the same thing? and do we need both?
Click to expand...
Click to collapse
lol, no.
Swap is virtual memory. It uses a seperate partition to act as extra RAM, but it's nowhere near comparable to real RAM.
Compcache compresses what's in the RAM, so there's more space to cram files in. The problem is constantly compressing and decompressing files in RAM puts a heavy strain on the CPU.
so do i need to put the usernit files on or did this rom already do it?
does anyone know how to use the user.config app to do this?
nahanee20 said:
does anyone know how to use the user.config app to do this?
Click to expand...
Click to collapse
You DO NOT have to add any user int files to your sd for swap to work.
Its already rolling if you installed correctly.
go to terminal and use the print command to view your allocated spaces for each ext
Better yet, use the "free" command to see if it is really being used. I am pretty sure Cynanogen does not use a swap partition by default. It needs to be enabled. A easy way to check and setup your swap it to download swapper.
When I type free in the terminal I see 0 for total, used and free swap. I made an ext4 and a 32mb swap partition on my sd card. How do I enable swap on Cyanogen 4.2.5?
beav_35 said:
When I type free in the terminal I see 0 for total, used and free swap. I made an ext4 and a 32mb swap partition on my sd card. How do I enable swap on Cyanogen 4.2.5?
Click to expand...
Click to collapse
search user.conf app on market
I am having touble disabling swap. I turned off swapper, deleted the .swp file, turned swappiness to 0 in swapper to disable it.
I even tried
su
swapoff /dev/block/mmcblk0p3
Click to expand...
Click to collapse
In terminal, and nothing...
When I go into terminal and check.
su
free
Click to expand...
Click to collapse
It shows I still have swap on.
Can anyone point me into right direction. Or tell me how I can grab userconf file and edit that to disable it.
I really dont want to repartition all over again...
First do
cat /proc/swaps
to make sure that swap in in the the correct place. When i did it I found that it was not in the same place as it was before.
Mines in /dev/block/ramzswap0 not /dev/block/mmcblk0p3
dont have to fully repartition, just grab a ubuntu live cd, and use gparted to blank out the swap partition.... if theres no swap partiton, and no swap file, then there's NO WAY to have swap on... or if you know what your doing boot into recovery and use the CLI gparted there to blank the swap space...
garz said:
I am having touble disabling swap. I turned off swapper, deleted the .swp file, turned swappiness to 0 in swapper to disable it.
I even tried
In terminal, and nothing...
When I go into terminal and check.
It shows I still have swap on.
Can anyone point me into right direction. Or tell me how I can grab userconf file and edit that to disable it.
I really dont want to repartition all over again...
Click to expand...
Click to collapse
Typically, to disable swap, you need to undo what you did to ENABLE it.
And CM does NOT automatically set up swap, so you would have had to intervene manually.
ALTERNATIVELY, you have, not swap, but COMPCACHE -- is you "swap" showing as 24 MB? If it is, you can just go into spare parts to disable it.
I'll ditto that
lbcoder said:
Typically, to disable swap, you need to undo what you did to ENABLE it.
And CM does NOT automatically set up swap, so you would have had to intervene manually.
ALTERNATIVELY, you have, not swap, but COMPCACHE -- is you "swap" showing as 24 MB? If it is, you can just go into spare parts to disable it.
Click to expand...
Click to collapse
Yup, same here with CM7.2, was amazed to find that swap was supposedly still on, but it was compcache I was really worried I'd have a wrecked sd card on my hands
"Its recommend to partition your sdcard before flash"
whats the use?..........
you can use cwm with the phone or minitool partition wizard with the pc
venkatarajeev131 said:
"Its recommend to partition your sdcard before flash"
whats the use?..........
Click to expand...
Click to collapse
the rom maybe containing a2sd script that's why it need a second partition do it there is no harm
What size this partition should be? 100MB is enough?
felipevsw said:
What size this partition should be? 100MB is enough?
Click to expand...
Click to collapse
atleast 512 mb for ext parttion you should create a swap partition of 256 mb,
swap will replace the ram according to the swappiness set by you
dhlalit11 said:
atleast 512 mb for ext parttion you should create a swap partition of 256 mb,
swap will replace the ram according to the swappiness set by you
Click to expand...
Click to collapse
So it should be 2 partitions: one with 512 MB and another with 256 MB... The one with 512 should be formatted ext4? and the other swap (of course)?
felipevsw said:
So it should be 2 partitions: one with 512 MB and another with 256 MB... The one with 512 should be formatted ext4? and the other swap (of course)?
Click to expand...
Click to collapse
Set it as ext2, it's faster.
---------- Post added at 08:15 PM ---------- Previous post was at 08:06 PM ----------
dhlalit11 said:
atleast 512 mb for ext parttion you should create a swap partition of 256 mb,
swap will replace the ram according to the swappiness set by you
Click to expand...
Click to collapse
Here's some info on how Linux (and thus Android) uses swap. http://www.linux-tutorial.info/modules.php?name=MContent&pageid=89
I wouldn't bother with it on a phone since Linux will just swap unchanged files right back to where they are on the phone storage without the need for a swap file and since it's unlikely that you'll ever multitask large user files on it there really is no need for it.
felipevsw said:
So it should be 2 partitions: one with 512 MB and another with 256 MB... The one with 512 should be formatted ext4? and the other swap (of course)?
Click to expand...
Click to collapse
swap is optional but it's good to have
dhlalit11 said:
swap is optional but it's good to have
Click to expand...
Click to collapse
For what? Who is changing large data files on their phone? In all likelihood it will cost you more memory to have a swap file than it will save you memory since it won't be used.
Linux won't use it at all if the file in memory hasn't changed since it was last read from storage, it will just swap it back to where it was last read, that is, if you have an app open and more memory is needed linux will first check to see if the file has been changed since last read and since it's an app it will just link it back to where it was read from in the first place rather than to put yet another copy in swap.
Jinxxed said:
For what? Who is changing large data files on their phone? In all likelihood it will cost you more memory to have a swap file than it will save you memory since it won't be used.
Linux won't use it at all if the file in memory hasn't changed since it was last read from storage, it will just swap it back to where it was last read, that is, if you have an app open and more memory is needed linux will first check to see if the file has been changed since last read and since it's an app it will just link it back to where it was read from in the first place rather than to put yet another copy in swap.
Click to expand...
Click to collapse
am not talking about swap file am talking about swap partition and if you think there is no need then why are there paid apps like swapper for root and why are people paying for them.
suppose you are playing shadow gun with help of cf3d after the play you find that all the app like launcher background working apps are stopped due to low ram but if you have swap then the app's memory will move to swap partition and it will not close
when I had mini I had a swap partition of 512 MB and it was really working and if you think the life of SD will decrease then you should know that it has a veeeeeery lil effect on life so don't worry there is no harm
Thank u for this useful thread..
dhlalit11 said:
am not talking about swap file am talking about swap partition and if you think there is no need then why are there paid apps like swapper for root and why are people paying for them.
suppose you are playing shadow gun with help of cf3d after the play you find that all the app like launcher background working apps are stopped due to low ram but if you have swap then the app's memory will move to swap partition and it will not close
when I had mini I had a swap partition of 512 MB and it was really working and if you think the life of SD will decrease then you should know that it has a veeeeeery lil effect on life so don't worry there is no harm
Click to expand...
Click to collapse
Whether you use a swap file or partition is irrelevant, Linux can use either and they work exactly the same.
In your example, all the apps would be swapped RIGHT BACK TO WHERE THEY ARE STORED since they did not change since last read, the swap would be unused and the apps would still be swapped.
I don't know if it's that you fail to comprehend the simple subject or refuse to read both what i post and what i link to but you are not understanding this.
Of course it won't affect the SD cards lifetime, it won't be used.
[DEV-HINT] Implementing a swap partition or swap file for new and old bootloader
Wikipedia defines swap file (or paging) as: "[..] use disk storage for data that does not fit into physical random-access memory (RAM)."
With CM10 or CM10.1 around, the 'about phone' screen usually shows 343 MB of usable RAM on the LG-P990, so one gets ideas. With CM9 it was a bit better, but still.... Take Chrome for example: nice to the eye, but not so nice to the RAM of devices that have been around a lot longer than the Nexus 4 with its whopping two Gigabytes. So what's the catch with swap? For example, a HDD swap partition on a PC offers some sort of relief when RAM is scarce by moving some parts of the RAM (pages) to the HDD and moving them back when it needs it. Of course, it comes for a price: performance! But it works. So why not using it on Android too? To hell with the fact that virtual RAM on the internal memory card is a lot slower than physical RAM, there are times when it would be just nice to have the extra megabytes at hand.
Were you a bit envious too when you saw that the 'new' partition layout that came with the ICS bootloader on our beloved LG-P990 had a swap partition included? Well, I was. I even changed to a customized layout to get one for a little while too... But that is not really necessary. Never was, actually. I came back to the original layout and old bootloader weeks ago. What still bugged me was the missing swap partition. CM10.1, CM10 or even CM9 could really use swap from time to time but commonly don't use it.
So, is there really a big difference between the two partition layouts? Yes, but regarding the swap it doesn't count. In fact, the situation for both user groups is pretty much the same: both do not use any kind of swap space whatsoever. First, there are the users with the new bootloader. They have the swap partition but actually don't make use of it. As compared with users with the old bootloader: they may not have the swap partition on their partition table but even they can easily implement a solution very similar to a standard swap partition: a swap file. Then they can benefit as well from some extra Megabytes in certain low memory situations. You don't have a swap partition/file in use yourself yet? In just a few minutes you can change that no matter what bootloader you have.
First you have to find out which bootloader/partition layout is on your LG-P990:
here is how you determine your bootloader/partition layout: reboot!
If you see a pink LG logo when the phone boots then you have the new bootloader/new partition layout (ICS)
If you see a white LG logo when the phone boots then you have the old bootloader / old partition layout(GB)
All commands used in the terminal are shown with a '$'-sign or '#'-sign (root). Copy just the commands without the signs to the terminal, unless stated otherwise.
New bootloader/partition layout (ICS) - Pink LG logo as splash screen - You have the old bootloader/partition layout? Skip to the second part below.
If you are using the new partition layout, then it is easy to use the swap mechanism. The 350MB swap partition is just waiting for you to be switched on.
Use 'adb shell' or the terminal:
check the situation with
Code:
$ free
Does it show 0 0 0 in the swap line? Then swap is not working at the moment and has to be switched on.
Use
Code:
$ su
to get superuser rights
Make the swap partition usable (Be extra careful! Triple-check the command!)
Code:
# mkswap /dev/block/mmcblk0p4
Switch it on
Code:
# swapon /dev/block/mmcblk0p4
Change swappiness to zero at runtime
Code:
# sysctl -w vm.swappiness=0
To keep the swap partition switched on, after reboot and even after flashing ROM updates
create the file /data/local/userinit.sh
Put these lines inside (with the '#' sign)
Code:
#!/system/bin/sh
swapon /dev/block/mmcblk0p4
sysctl -w vm.swappiness=0
swappiness=0 lets the kernel use the swap partition only when there is no more physical RAM left.
Save the file.
Now reboot.
Check it via adb shell or terminal if it is working.
Code:
$ free
The swap line should show that 350 MB are available (total/free).
Check the swappiness with
Code:
$ cat /proc/sys/vm/swappiness
It should show 0 now.
Testdrive your work. Start Chrome or a game or whatever uses a lot of RAM on your system. Use it heavily and then check the swap usage of your kernel again with a final
Code:
$ free
Just try it!
Old bootloader/partition layout (GB) - White LG logo as splash-screen
The task is to create a 128 MB Swap-File on the data partition. 128 MB seems enough since it is just for memory emergencies. And it's best to create it on the data partition and not on the sdcard because of the USB mass-storage support that would interfere with any swap file on sdcards. By the way, it doesn't format your data partition. It just makes your usable space of the data partition 128 MB smaller than it is right now. Basically, it creates an empty file with the fixed size of 128 MB and makes it usable as a swap 'partition'. It has the same functionality as a swap partition. And the same speed. And everything else. It just doesn't reside in its own partition. It is even better: when you don't want it anymore or change the size of it, just stop the swap-file with 'swapoff' and delete the file 'swapfile' in your data partition and it's gone for good. Immediately you can use the freed-up space for something else.
Use 'adb shell' or the terminal:
check the situation with
Code:
$ free
Does it show 0 0 0 in the swap line? Then it is not working at the moment and has to be switched on.
See with
Code:
$ df
whether there is enough free space left on /data. 200 MB or more should be free on /data. 128 MB will be used.
Get superuser rights
Code:
$ su
Optional: To see more interesting memory stats you can use
Code:
# cat /proc/meminfo
Now create the file named 'swapfile' with the size of 128 MB
Code:
# dd if=/dev/zero of=/data/swapfile bs=1024 count=128000
This can take a moment.
Limit the rights of the swapfile
Code:
# chmod 600 /data/swapfile
now set up the swapfile for swap usage
Code:
# mkswap /data/swapfile
Switch it on
Code:
# swapon /data/swapfile
Hint: switch off would be swapoff /data/swapfile
Now it is already working!
Tune it to your needs: we just want the swap file to be used in emergencies when there is no RAM left anymore and Android would turn Project Butter in Project Stutter.
Check the status of swappiness
Code:
# cat /proc/sys/vm/swappiness
Default is 60. That is much too high. swappiness=0 lets the kernel use the swap file only when there is no more physical RAM left.
Change it to zero
Code:
# sysctl -w vm.swappiness=0
With this sysctl command you can change the swappiness setting (0-100) on runtime.
If you want to make these settings permanent no matter if you reboot or even flash a ROM update without wiping data then
create the file /data/local/userinit.sh
Put these lines inside (with the '#' sign)
Code:
#!/system/bin/sh
swapon /data/swapfile
sysctl -w vm.swappiness=0
Save it.
Reboot and check it with a last
Code:
# free
in terminal. Now testdrive your swap file with two browsers and a game simultanously or whatever suits your needs to stress your P990.
Just try it yourself!
Have fun!
and another awesome dev thread by Raum1807 :good:
Interested in making a flashable zip out of it? If not I could do it next week.
Just adding everything into one sh-file which gets called by the updater-script - or just via the Terminal.
tonyp said:
and another awesome dev thread by Raum1807 :good:
Interested in making a flashable zip out of it? If not I could do it next week.
Just adding everything into one sh-file which gets called by the updater-script - or just via the Terminal.
Click to expand...
Click to collapse
Thanks for the offer. Thought about that, too. But I think it is more interesting to understand what we are doing here by following it step-by-step. A script makes it too easy... Maybe later, we will see.
sorry for this dumb question.
what's the difference between using this method and using roehsoft ram expander?
both of them have the option to change swappiness and to enable/disable swap from sdcard (roehsoft ram expander can even choose ext sd as swap location)
i don't get it :silly:
old bootloader:
/data/swapfile # that's internal sd right?
wouldn't it be better to use external sd for swapping as swapping heavily might in the long run kill a flash drive?
derEremit said:
old bootloader:
/data/swapfile # that's internal sd right?
wouldn't it be better to use external sd for swapping as swapping heavily might in the long run kill a flash drive?
Click to expand...
Click to collapse
i don't think so, AFAIK the max reading speed for ext sd is 10 MBps, which is lower than reading speed in our int sd (about 13 MBps). that's why using int one for swapping would be a better choice
please CMIIW, i'm still noobs in this kind of stuff. though, i just want to share what i know
I have one point to this.
You write "swappiness=0 lets the kernel use the swap partition only when there is no more physical RAM left."
But there is every time some free space on RAM, because android never let decrease memory to zero.
babi_perang said:
sorry for this dumb question.
what's the difference between using this method and using roehsoft ram expander?
both of them have the option to change swappiness and to enable/disable swap from sdcard (roehsoft ram expander can even choose ext sd as swap location)
i don't get it :silly:
Click to expand...
Click to collapse
- Doesn't use the external sdcard
- Doesn't cost 7 Euro
- gives you an idea how things work
Sent from my LG-P990 using xda app-developers app
derEremit said:
old bootloader:
/data/swapfile # that's internal sd right?
wouldn't it be better to use external sd for swapping as swapping heavily might in the long run kill a flash drive?
Click to expand...
Click to collapse
Swapping is only happening when the RAM is critically low. Btw, the swap partition of the ICS partition layout is also located on the internal memory. No difference so to speak. Using this method shouldn't harm the internal memory at all.
Sent from my LG-P990 using xda app-developers app
tomsi91 said:
I have one point to this.
You write "swappiness=0 lets the kernel use the swap partition only when there is no more physical RAM left."
But there is every time some free space on RAM, because android never let decrease memory to zero.
Click to expand...
Click to collapse
Yes, the memory management of Android tries to keep the RAM clean while keeping the last few opened apps in the RAM. Four or five running CM10.x on the P990. But the less RAM you have on your phone the harder this balance gets. Imagine memory eating apps like Gallery/Camera or Chrome. They benefit from more memory being available.
Sent from my LG-P990 using xda app-developers app
Thank you for this helpful guide! It is so easy to make it. And now I know a bit much more about Android and RAM.
Gesendet von meinem LGP990 mit CM10.
Hey! This seems interesting but i have a question , before doing this we have 343 RAM available and after all this trouble only 350 ? so thats 7more RAM or am i missing something ?
Soare23 said:
Hey! This seems interesting but i have a question , before doing this we have 343 RAM available and after all this trouble only 350 ? so thats 7more RAM or am i missing something ?
Click to expand...
Click to collapse
Yes, you forgot to read the original post that explains what exactly swap is:
So what's the catch with swap? For example, a HDD swap partition on a PC offers some sort of relief when RAM is scarce by moving some parts of the RAM (pages) to the HDD and moving them back when it needs it. Of course, it comes for a price: performance! But it works. So why not using it on Android too? To hell with the fact that virtual RAM on the internal memory card is a lot slower than physical RAM, there are times when it would be just nice to have the extra megabytes at hand.
Click to expand...
Click to collapse
The reported RAM will remail the same because you aren't increasing your physical RAM.
When i try to creat a swap file, this Error appears:
/def/zero/: canot open for read: Not directory
I'm a superuser
---------- Post added at 09:20 PM ---------- Previous post was at 09:13 PM ----------
After disconnecting from computer it worked!
Swappiness=0 doesn't stick for me after reboot It returns to 60 everytime.
@Raum1807
Awesome thread. Thanks for kindly explaining everything. I learned a lot here!
Ajsh said:
Swappiness=0 doesn't stick for me after reboot It returns to 60 everytime.
Click to expand...
Click to collapse
just put:
echo "0" > /proc/sys/vm/swappiness
at the end of a .sh file in init.d
As we´re talking about using the wasted Swap-Partition:
Is it possible to use it as a "new" kind of Ramhack?
As for now we cut off some shared Ram of GPU to use it as normal RAM. What if we let the GPU use the Swap-Partition as its Memory and get all physical RAM available?
GPU will not perform as good as now, but some People don´t need a Phone to play Games...
Is this possible or restricted to some Nvidia-Libs that are Closed-Source??
zerocoolriddler said:
As we´re talking about using the wasted Swap-Partition:
Is it possible to use it as a "new" kind of Ramhack?
As for now we cut off some shared Ram of GPU to use it as normal RAM. What if we let the GPU use the Swap-Partition as its Memory and get all physical RAM available?
GPU will not perform as good as now, but some People don´t need a Phone to play Games...
Is this possible or restricted to some Nvidia-Libs that are Closed-Source??
Click to expand...
Click to collapse
This is interesting... it could really make a difference , only if it works tho heh.
Sent from my LG-P990 using xda app-developers app
Can we have both Swap and Zram on in CM 10 ? Any possible side effects