I will install cyanogenmod[02.14.2012]. Before installing that, must i divide the sdcard two part(ext4 and fat32)?
if i don't divide sd card ,can i install app to sd card(can i experience any problem app moving sd card)?
Well, you hould divide sd card for three parts, not two.
fat32, ext4, swap.
Why ? Because phone with swap works much more faster.
how many megabytes are enough for swap and ext4?
and can we divide using MiniTool Partition Wizard Home Edition 7.0 ?
oddo1907 said:
how many megabytes are enough for swap and ext4?
Click to expand...
Click to collapse
There is a rule that swap must be two times the size of your physical memory (RAM), so you should set it to 512MB of swap. That's how you have 768MB of virtual memory. The tricky party is that with swap your phone becomes able to run heavier apps which requires more RAM but also since you use SD card instead of ram your phone becomes slower when it's in use of swap.
As for the ext4 partition, I usually set it to ~400MB. But I never manage to even come closer to use all of those 400MB. 50+ apps are arouond 200MB so decision is yours.
Cheers!
additon, how can divide sd card? i used minitool partition home edition.will be this cause any problem?
oddo1907 said:
additon, how can divide sd card? i used minitool partition home edition.will be this cause any problem?
Click to expand...
Click to collapse
No problem but it's better to use a memory card reader than to make it with phone in usb.
I tried with phone in usb and I had to pull battery and to retry.
eSu.Matix said:
There is a rule that swap must be two times the size of your physical memory (RAM), so you should set it to 512MB of swap. That's how you have 768MB of virtual memory. The tricky party is that with swap your phone becomes able to run heavier apps which requires more RAM but also since you use SD card instead of ram your phone becomes slower when it's in use of swap.
As for the ext4 partition, I usually set it to ~400MB. But I never manage to even come closer to use all of those 400MB. 50+ apps are arouond 200MB so decision is yours.
Cheers!
Click to expand...
Click to collapse
With all new ROMs (CM7 by fjf, Cronos Ginger 1.7, etc) coming in to our phone, are all of them support this swap partition? Thanks.
Related
I noticed that /dev partition doesnt seem to get used often. Was thinking about having the swap file sit there. It looks like the partition gets cleared out after a reboot which is fine by me. would gladly sacrifice some extra bootup time for faster swap file.
/dev is a pseudo filesystem containing handles for your hardware devices
do not touch it
/dev is actually mounted in RAM, so putting a swap file there doesn't make much sense.
I have a question:
If one does Apps2SD, you get a free space of around 75 MB on the data partition, right?
Can't this space be used for a swapfile instead of using the SD card? The internal memory should be faster than any SD card. Please correct me if I'm wrong.
djvw said:
I have a question:
If one does Apps2SD, you get a free space of around 75 MB on the data partition, right?
Can't this space be used for a swapfile instead of using the SD card? The internal memory should be faster than any SD card. Please correct me if I'm wrong.
Click to expand...
Click to collapse
yes but you will wear this memory out...then your phone will be useless... better to wear out a sd than wear out memory you cant replace
Im trying out a theory. I running JAC Hero 2.3 and wanna try running the swapfile on the /data partition. I moved app_s over to /system/sd and used swapper app to create the swapfile but android doesnt seem to use it. when i run free It says Total/used/free are all 0 but the swap file is 34 meg. I tried putting it in a sub folder and chown root.root on the folder before setting up and still no luck. Anyone have any ideas why it wont work on /data or how to get it to work on /data?
Once you run swapper go into the setting and change the location of your swap file from /sdcard/swapfile.swp to /system/sd/swap.swp ( see sxfx post[url]
you don't want to do that. Swapping involves a lot of writing and erasing, it'll wear out your internal chip and you'll start experiencing reduced capacity, write cycles for nand are even less than for flash memory!
jubeh said:
you don't want to do that. Swapping involves a lot of writing and erasing, it'll wear out your internal chip and you'll start experiencing reduced capacity, write cycles for nand are even less than for flash memory!
Click to expand...
Click to collapse
not to mention, swapon as implemented (on every build i've tried) doesn't work on a swapfile stored on a yaffs2 partition
jubeh said:
you don't want to do that. Swapping involves a lot of writing and erasing, it'll wear out your internal chip and you'll start experiencing reduced capacity, write cycles for nand are even less than for flash memory!
Click to expand...
Click to collapse
Actually /sdcard/ is your fat32 portion of your sd card, /system/sd/ is the ext2/3 of your sd card.
Also I have done a bunch of research on this write/read fiasco just because of android.
And even if you set a swap file to your SD sure it will shorten your life of the card but it will still last you at least 2 years.
I have been using USB devices on linux as swap locations forever now and I still have thumb drives that have been used and abused for months and months as a swap place and they are still pulling strong.
As for the internal chip, Im not sure what you mean by that?
Even if you could put swap on the internal flash, its not going to be faster.
Putting swap on the internal flash will make things slower as the internal flash is about 3 to 5 times slower than a class 6 sdcard.
you're comparing using a flash drive for swap in a full blown computer that probably has around 1-4gb of ram, the swap file is hardly ever touched, unless you're running a lot of applications at a time. Dream has only 90 mb available to dalvik, and rosie is a big fat... lady... plus linux/dalvik manage memory in a different way, so files are often dropped to swap and they dont stay there for long (maybe in a 256 swap, but not in a 32 mb one).
the OP also is talking about moving his swap to his internal storage (chip, nand, whatever), as he thinks it's having no effect working from the sd card. Personally, i think that both a2sd and swapper are flawed. They're overcompensating for an os that was not meant to run on that device, and the real work should be in porting (as in developing, not just file-swapping as most "devs" do here) a launcher app that we can feel comfortable with running on a stock android system with stock (or slightly improved) libraries and that we can call comparable to rosie. Just look at ahome or dxtop or openhome, they're good, solid, great looking home replacements that work as well or better than rosie, but they run out of the stock libraries. I wonder why nobody has made a free, open source home replacement app yet
jubeh said:
you're comparing using a flash drive for swap in a full blown computer that probably has around 1-4gb of ram, the swap file is hardly ever touched, unless you're running a lot of applications at a time. Dream has only 90 mb available to dalvik, and rosie is a big fat... lady... plus linux/dalvik manage memory in a different way, so files are often dropped to swap and they dont stay there for long (maybe in a 256 swap, but not in a 32 mb one).
the OP also is talking about moving his swap to his internal storage (chip, nand, whatever), as he thinks it's having no effect working from the sd card. Personally, i think that both a2sd and swapper are flawed. They're overcompensating for an os that was not meant to run on that device, and the real work should be in porting (as in developing, not just file-swapping as most "devs" do here) a launcher app that we can feel comfortable with running on a stock android system with stock (or slightly improved) libraries and that we can call comparable to rosie. Just look at ahome or dxtop or openhome, they're good, solid, great looking home replacements that work as well or better than rosie, but they run out of the stock libraries. I wonder why nobody has made a free, open source home replacement app yet
Click to expand...
Click to collapse
You make a very good point about computer having 1-4gigs of ram and not needing a swap file.
Honestly I almost never run a swap file on a computer that has more then 1gig of ram.
Plus90% of the time when I do run a swap file is when Im running a live distro of linux of a cd, but also 90% of the time I run the distro from the flash drive instead of cd cause its much faster.
So now imagine how many reads/writes I abuse that flash drive with by running a full OS on it.
Also I don't understand how a2sd or swapper is flawed? Just because they do their job? I mean it's not really our fault that they made the G1 with a little less memory spaces then we would like it to have.
But that's exactly why we have tools like swapper and a2sd. Plus no one is really forced to run these roms on the G1 phone and those of us that do realize that we have to take extra steps in creating tools to help it.
And that's not only true for the G1 but anywhere in the computer world these days.
dwang said:
Even if you could put swap on the internal flash, its not going to be faster.
Putting swap on the internal flash will make things slower as the internal flash is about 3 to 5 times slower than a class 6 sdcard.
Click to expand...
Click to collapse
I'd like to spread swap over the sd and internal storage if possible -- should make paging a lot less evident if priorities are set up properly.
dwang said:
Even if you could put swap on the internal flash, its not going to be faster.
Putting swap on the internal flash will make things slower as the internal flash is about 3 to 5 times slower than a class 6 sdcard.
Click to expand...
Click to collapse
internal memory is faster. class 6 guarantees 6mbs read/write times but doesnt mean the bus can support those times. if you run a test copying something to /system/sd and to /data you will see /data is faster. as for those saying it will degrade the internal memory, that is not the case being the flash memory inside is designed to have much much much more read/write cycles. Think about it in a stock G1, this is where dalvik-cache is writen to as well as email, sms, user settings, cache for browser and uTube. Do not confuse internal flash memory to sd card flash memory
Are you sure about that? This guy has some test results and it indicates that a class 6 sdcard is much faster than the internal flash.
http://forum.xda-developers.com/showpost.php?p=4059520&postcount=15
MonkySlap said:
internal memory is faster. class 6 guarantees 6mbs read/write times but doesnt mean the bus can support those times. if you run a test copying something to /system/sd and to /data you will see /data is faster. as for those saying it will degrade the internal memory, that is not the case being the flash memory inside is designed to have much much much more read/write cycles. Think about it in a stock G1, this is where dalvik-cache is writen to as well as email, sms, user settings, cache for browser and uTube. Do not confuse internal flash memory to sd card flash memory
Click to expand...
Click to collapse
dwang said:
Are you sure about that? This guy has some test results and it indicates that a class 6 sdcard is much faster than the internal flash.
http://forum.xda-developers.com/showpost.php?p=4059520&postcount=15
Click to expand...
Click to collapse
That's interesting. Going to have to try that test out. I just noticed when xfering stuff to /data it was faster then to /system/sd. If it is then touche my friend.....touche
Can any developer make use of the scripts used here http://forum.xda-developers.com/showthread.php?t=1281964 and make a detailed tutorial to increase the internal memory without having to use apps like link2sd
Some suggestions:
making the 2nd partion ext3 instead of ext2 to be able to handle more space
explaining the part of the htcfs
Cheers
Well, it's something quite similar.. and it's easier to use Link2SD actually. You can set the ext4 partition on the SD card to anything and just move everything.
Also, mounting /data/ to SD card will cause some lag; you'll need a higher SD card class. IMHO it's not worth the trouble - I have around 50 apps installed, including Sygic Aura (which is about 18 MB) and moved them all with Link2SD. Internal free space is 40 MB right now.
I wanted to know if we can increase the ram of our little pico (htc Explorer)....also I wanted to know the advantages of swap partition.....Does it increase the ram size ?? And also I wanted to know that if there are any other advantages of Sd-ext partition other than increasing the Internal memory ??
ahmadmemon said:
I wanted to know if we can increase the ram of our little pico (htc Explorer)....also I wanted to know the advantages of swap partition.....Does it increase the ram size ?? And also I wanted to know that if there are any other advantages of Sd-ext partition other than increasing the Internal memory ??
Click to expand...
Click to collapse
No, you can't. Physical RAM is fixed.
Swap acts as pagefile on Windows, if you know pagefile. swap is virtual RAM. When the system needs more memory, a part of RAM will be written to the swap partition. Swap partition is part of SD card, so it would be painfully slow to use. Beside that, using swap also quickly wear out your SD card.
Sd-ext partition can be configured to accommodate swap, if you have the right app/script. Normally, you divide your SD card in to 3 partitions, 1st for media, 2nd for app storage, 3rd for swap. And our phone's recovery have option to do this too.
As I said, I strongly object against using swap partition. It will make your phone even slower than without it.
Your best bet here is zRAM, or compcache. You can find zRAM setting in most CM based ROM. zRAM relies on compression to increase the virtual size of your RAM. For example, an app that usually takes 10MB of RAM will now take only 9MB if you choose 10% compression.
There're 10%, 18%, and 26% options. But zRAM is not free. It uses your CPU to compress and decompress data, so our phone's weak CPU is not very happy with it. Your choice. But if you really need more app to cache more app (better multi-tasking), 10% zRAM will give you about 40MB RAM more (400MB*10%=40MB), at the cost of little CPU and battery. Using 18% and 26% seems too aggressive.
redguardsoldier said:
No, you can't. Physical RAM is fixed.
Swap acts as pagefile on Windows, if you know pagefile. swap is virtual RAM. When the system needs more memory, a part of RAM will be written to the swap partition. Swap partition is part of SD card, so it would be painfully slow to use. Beside that, using swap also quickly wear out your SD card.
Sd-ext partition can be configured to accommodate swap, if you have the right app/script. Normally, you divide your SD card in to 3 partitions, 1st for media, 2nd for app storage, 3rd for swap. And our phone's recovery have option to do this too.
As I said, I strongly object against using swap partition. It will make your phone even slower than without it.
Your best bet here is zRAM, or compcache. You can find zRAM setting in most CM based ROM. zRAM relies on compression to increase the virtual size of your RAM. For example, an app that usually takes 10MB of RAM will now take only 9MB if you choose 10% compression.
There're 10%, 18%, and 26% options. But zRAM is not free. It uses your CPU to compress and decompress data, so our phone's weak CPU is not very happy with it. Your choice. But if you really need more app to cache more app (better multi-tasking), 10% zRAM will give you about 40MB RAM more (400MB*10%=40MB), at the cost of little CPU and battery. Using 18% and 26% seems too aggressive.
Click to expand...
Click to collapse
Does zRAM works without swap partition ??
Yes, it's different, you can read @redguardsoldier's post again, to get exactly what he is saying, just to be on the safe side
Increase RAM In HTC Pico (I worked For ME ).
ahmadmemon said:
I wanted to know if we can increase the ram of our little pico (htc Explorer)....also I wanted to know the advantages of swap partition.....Does it increase the ram size ?? And also I wanted to know that if there are any other advantages of Sd-ext partition other than increasing the Internal memory ??
Click to expand...
Click to collapse
TRY THE LINK BELOW IT WOKED FOR ME :laugh: >>>>>>>>>>>>
http://forum.xda-developers.com/showthread.php?t=2735281
I hope It will work for u as WELL :good:
Hello everyone,
I need some help with expanding RAM of an old android tablet of mine, more specifically, an Genesis GT-7204, using an SD card.
I rooted the tablet already and granted the app RAM Expander from Roehsoft root permissions, but when i try to use the app i get the following message: "This path is not available for swap!" Image below:
https://imgur.com/4MZ2l
The path i used was mnt/local:
https://imgur.com/6zUH7
Thanks in advance!
The images might be blocked, in any case i will post them here.
Personally have experienced that Virtual RAM ( aka SWAP RAM ) can only get created on a device's internal storage memory ( aka /sdcard ).
Hint: As path manually enter /data .
BTW:
Android since ever comes with virtual RAM ( SWAP RAM) feature. The internal storage memory used herefore is the /cache partition.
Also take note that an Android apps' memory usage by design is limited to some MBs. Even if you increase in Android's system file called build.prop the related amount, it's not sure that this is taken into account: an app's develeoper allows this or not.
And keep in mind that apps that did not fit in the RAM before without swap do not suddenly fit in the RAM.
Don't expect wonders using Roehsoft's RAM Expander. Probably you may not notice any gain in device's performance.
So i can only use my internal storage to add RAM? And not the SD card?
And to do this i have to manually set a path, but i am new at this, but i have to use /data or there is something else?
And in my case it is worth it, because this freaking tablet has only 500 MB of RAM!!!!!
jwoegerbauer said:
Personally have experienced that Virtual RAM ( aka SWAP RAM ) can only get created on a device's internal storage memory ( aka /sdcard ).
Hint: As path manually enter /data .
BTW:
Android since ever comes with virtual RAM ( SWAP RAM) feature. The internal storage memory used herefore is the /cache partition.
Also take note that an Android apps' memory usage by design is limited to some MBs. Even if you increase in Android's system file called build.prop the related amount, it's not sure that this is taken into account: an app's develeoper allows this or not.
And keep in mind that apps that did not fit in the RAM before without swap do not suddenly fit in the RAM.
Don't expect wonders using Roehsoft's RAM Expander. Probably you may not notice any gain in device's performance.
Click to expand...
Click to collapse
So i can only use my internal storage to add RAM? And not the SD card?
And to do this i have to manually set a path, but i am new at this, but i have to use /data or there is something else?
And in my case it is worth it, because this freaking tablet has only 500 MB of RAM!!!!!
pprg1101 said:
So i can only use my internal storage to add RAM? And not the SD card?
And to do this i have to manually set a path, but i am new at this, but i have to use /data or there is something else?
And in my case it is worth it, because this freaking tablet has only 500 MB of RAM!!!!!
Click to expand...
Click to collapse
Honestly I never used Roehesoft's RAM Expander on a real Android device and I'll never will use it: In my eyes it's crap. And, you'll find no serious confirmations in the WEB that it works as claimed.
Android for good reason doesn't come with SWAP feature. Android's Memory Manager frees RAM if necessary.
It's on you to play around with Roehesoft's RAM Expander. Good luck.
My last 2 cents here:
SWAP is a place on the internal storage memory (usually a dedicated partition) that is used to store programs or data that can't fit in memory, like when a program grows more than the available RAM (BTW: In the world of Windows this space is called Swapfile.sys ). SWAP is way slower than RAM, so when you create / enable SWAP the phone gets slower, but at least the program can work.
All the stuff that can't or shouldn't stay in your RAM is written out to SWAP and read back in when needed. This means that the SWAP medium needs to be fast and resilient to lots of writes.
IMHO using an external SD card as SWAP fails on both counts. It is slower at reading/writing than a phone's internal drive, and each of its constituent sectors can only be written to a limited number of times before they wear out and can no longer reliably store data.
SC pl