Database Users

Available Memory

So when im not running anything, when i open Advanced Task Killer it has like 125M is this right???
So what the other 387MB doing?

what I see
when I 1st start I have about 230MB, after a few minutes it goes down to about 90mb...without opening anything...seems many programs on the Samsung "open" by themselves...also, I see that the CPU goes down to about 100Mhz so I keep it at 1000Mhz with setcpu....plus deleted many Samsung apps(about 30MB)...helps with the lag...

Don't worry so much about it. This isn't windows, you don't need to worry about free RAM. Android will kill tasks as needed to free ram when it needs to. Some of that is likely used for disk cache as well. That will also be released as needed. Let the OS do its job, it's quite good at it..
Killing some of the bloatware will help as well, but you need root.
I also think that this phone, like the G1, has some of the speced 512M ram dedicated to the camera, GPU, and other stuff. In the terminal, free shows about 388M as total ram.

is it a good to create a swap partition on the SD card?

Why on earth would you want swap with this much ram? You likely can, with root and swapper, but why? This phone doesn't need it like the G1 did. Swap could help keep more apps open in the background, but there are already a lot of them there. I don't see any benefit to swap right now. What isn't working for you that you think is related to low ram?

ttabbal said:
Why on earth would you want swap with this much ram? You likely can, with root and swapper, but why? This phone doesn't need it like the G1 did. Swap could help keep more apps open in the background, but there are already a lot of them there. I don't see any benefit to swap right now. What isn't working for you that you think is related to low ram?
Click to expand...
Click to collapse
Yeah...what he said ^
Sent from my Samsung Vibrant using XDA App

As with the nexus one, not all 512mb can be addressed by the system right off the bat; we may need to wait until a newer kernel comes out
Sent from my SGH-T959 using XDA App

How much internal memory do you have left?

I have voodoo (dirrks) non overclocked, don't have a ton of apps installed but have just over 700mb free internally. I know its because of the voodoo partition but is there some way to relocate some things? Pretty sure my browser cache is set to external...
Feel like I'm gonna run out soon
Sent from my SCH-I500 using XDA App

i have 1.3 gigs

Voodoo should not take up a significant amount of extra space. The old ext2 lagfix did because it basically created a virtual partition within a partition but Voodoo doesn't require any additional space (beyond maybe a few meg for files).

Actually, about 200mb, give or take.

Yeah out of the box I believe the internal storage is 1.52GB, with voodoo it drops to 1.31GB. According to appbrain I have 180 apps installed taking up 425mb. So according to the stock task manager I'm using 672mb out of 1.31GB [basically half]. Im not really in danger of running out of space anytime soon

adrynalyne said:
Actually, about 200mb, give or take.
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Click to collapse
Thanks adrynalyne - I stand corrected.

Dang just found out that nfs shift is taking up 100 mb, 100! But is there a way to just relocate this to the memory card?
Sent from my SCH-I500 using XDA App

Does MTD/Yaffs2 perform better than BML/Rfs,Ext4?

By now maybe there are some available performance results, especially since it's possible to run the same rom with different file systems.
I haven't seen much discussion about the performance aspects even in theory.
Is yaffs2 faster? Is it more stable or less likely to corrupt files? Does it result in more disk writes? Is it harder on the storage medium?
So beyond the fact that MTD/YAFFS2 is more mainstream and will make CM easier to keep up with what, if any are the performance benefits of the filesystem itself? Especially for people who may never go to CM or won't for months.
Oh, last question: MTD allows more storage in the /data folder if I understand correctly. How much more though? What is the /data size under BML and how large can it get under MTD? And what performance benefit is there from that?

More stable, faster, less writes, easier on disk, open source, dev customizable for partition sizes (not just data)...
Sent from my SPH-D700 using XDA App

I switched over to MTD yesterday and so far my phone is running fine. The switch took half an hour and I notice a little less lag with
certain apps.
IMO, you need to try it for yourself and see if you like it.
Send from my SPH-D700 (Samsung Epic 4G)

garyf said:
By now maybe there are some available performance results, especially since it's possible to run the same rom with different file systems.
I haven't seen much discussion about the performance aspects even in theory.
Is yaffs2 faster? Is it more stable or less likely to corrupt files? Does it result in more disk writes? Is it harder on the storage medium?
So beyond the fact that MTD/YAFFS2 is more mainstream and will make CM easier to keep up with what, if any are the performance benefits of the filesystem itself? Especially for people who may never go to CM or won't for months.
Oh, last question: MTD allows more storage in the /data folder if I understand correctly. How much more though? What is the /data size under BML and how large can it get under MTD? And what performance benefit is there from that?
Click to expand...
Click to collapse
1. From my own personal experiences, yes it contains a quicker response in areas in which it is needed, more of a smooth user experience. I've not yet seen someone complain about a clunkiness due to our new partition configuration. Yes it is more than stable, data corruption on MTD/yaffs2 is unheard of, very unlikely as it doesn't just randomly occur or nowhere as often as it can on EXT4, it doesn't mean that if you do something like OC to a high frequency that it cannot happen. That's always is and always will be subject to how you run your device. And no, it is more meant for flash based devices which we in essence are. It's a ways smoother and reads and writes better to our nand.
2. To a normal user, in all honesty, it's something new. The benefits are the increase in space of data. 689 mb to be exact, although some of that space is always being used from the getgo. Being that there are now stock boot.imgs any user can go to MTD and not truly have a need to go back to BML or the constant fear of having to Odin for those who are iffy on it and not lose out on the stock feel, they've a choice between AOSP as well as StockWiz.
3. 689 mb MTD compared to about 200ish BML, or less in the data. And you've got to take space from the others to allocate it in the longer run of things. It doesn't stunt or skyrocket performance, it's independent of it.
Let me know if I answered your questions at all lol. I was vague as usual.

I've battery pulled dozens of times on yaffs2 with no data corruption. no such luck on ext4
Sent from my SPH-D700 using xda premium

I've not noticed one iota of difference between RFS, ext4 and now yaffs2 in real world usage, so all I can go on are the benchmarks I've run.
In my testing synthetic disk benchmarks have shown yaffs2 to perform about the same as RFS. ext4 is only faster when mounted with the unsafe, data-corrupting 'noauto_da_alloc' option. Without that options, it performs about the the same as RFS too.
yaffs2 is a win for all of the reasons marcusant listed aside from (IMO) performance.
---------- Post added at 08:57 PM ---------- Previous post was at 08:52 PM ----------
starskyrob said:
I've battery pulled dozens of times on yaffs2 with no data corruption. no such luck on ext4
Click to expand...
Click to collapse
You can thank the 'noauto_da_alloc' option for that. In all of the documentation I've found regarding ext4, it explicitly warned that if you use that option you must have battery backup for your disk devices or you will experience zero length files in the case of power loss.
Whoever first discovered that tweak on ext4 and convinced everyone to use should be smacked over the head a few times.

I think team bonsai disabled journaling
..
Sent from my SPH-D700 using XDA App

marcusant said:
I think team bonsai disabled journaling
..
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
When I was first making my kernel I noticed that my ROM running ext4 would only score 1700 in Quadrant while other ext4 ROMs scored 2300. It turned out to be the 'noauto_da_alloc' option that provided that instant 700 point boost. I also experimented with jourmaling and found the difference it made very small - at least in quadrant scores. The 'noauto_da_alloc' option leads to zero length files on power loss, regardless of whether or not journaling is on.
Oh, and I think I found the person who introduced this to everyone. It was supercurio.

I have to say I find this thread extremely informative.
Because of rfs/ext4, I expect there to be some form of tradeoff going between file systems. I'm a lot less worried about that now.
Thanks a lot all.
My understanding from the answers I've seen is that quadrant scores are about the same between rfs and yaffs2 and there are almost no real-world performance issues either way, except that it will take longer before you have to begin moving apps to sd storage.
If that's right, thanks for making it very easy to get that info.

marcusant said:
I think team bonsai disabled journaling
..
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
Ouch!...LOL! And as quickly as I could re-enable journaling I did. Did not notice any performance difference. Now we have MTD!

Another thing, the extra space on the /data partition only comes for roms built for MTD, correct?
Until TW roms are built from the ground up with MTD, rather than porting them across, that benefit will not apply?
Also can someone explain in more detail where this extra memory is coming from? Do BML filesystems just waste 400 megs or so of storage space, or is something being compressed or removed to get this extra storage?

garyf said:
Another thing, the extra space on the /data partition only comes for roms built for MTD, correct?
Until TW roms are built from the ground up with MTD, rather than porting them across, that benefit will not apply?
Also can someone explain in more detail where this extra memory is coming from? Do BML filesystems just waste 400 megs or so of storage space, or is something being compressed or removed to get this extra storage?
Click to expand...
Click to collapse
This extra space is on every MTD ROM out. The space won't change whether the ROM is intentionaly built on MTD or not. The extra space on BML is taken by /cache which is reduced to 25MB or so. /cache is really only used by market(for large app downloads) and by OTA updates(which we'll only see 1 more).
Sent from my SPH-D700 using xda premium

ac16313 said:
This extra space is on every MTD ROM out
Click to expand...
Click to collapse
WOW! I went and checked, and I have 267mb used and 409mb free now!
....and thats with NO apps on SD card!!!
Dammmmmmmmmmmm!
edit: 193mb used with 483mb free after moving apps to SD WOOHOO!
ac16313 said:
The extra space on BML is taken by /cache which is reduced to 25MB or so. /cache is really only used by market(for large app downloads)
Click to expand...
Click to collapse
Would this affect extra large app downloads, as in when the app is 50+mb or some such?

DCRocks said:
Would this affect extra large app downloads, as in when the app is 50+mb or some such?
Click to expand...
Click to collapse
Not if the market is fixed to cache to sdcard
Sent from my SPH-D700 using xda premium

ac16313 said:
Not if the market is fixed to cache to sdcard
Sent from my SPH-D700 using xda premium
Click to expand...
Click to collapse
thanks, gonna have to keep an eye on that the next time I dl a large app

ac16313 said:
Not if the market is fixed to cache to sdcard
Sent from my SPH-D700 using xda premium
Click to expand...
Click to collapse
There is an init script in my rom and cm7 that downloads large apps to data.
Sent from my SPH-D700 using XDA App

marcusant said:
There is an init script in my rom and cm7 that downloads large apps to data.
Sent from my SPH-D700 using XDA App
Click to expand...
Click to collapse
Can you make a flashable for the rest of us ROM hoppers?
Sent from my SPH-D700 using XDA App

(INFO)What is zram and how does it work???

I think its better to Post this here,when its not better,than sorry!!!
-----------------------------------------------------------------
Once a brief statement for those who are not traveling so long in the Android scene:
ZRAM = ramzswap = Compcache
In order to explain more precisely ZRAM first need other terms are more clearly defined:
Swap can be compared with the swap file on Windows. If the memory (RAM) to complete the PC the data that are being used not actively outsource (eg background applications) so as to re-evacuate RAM free. To this data is written to a hard disk. If required, this data is then read back from there easily. Even the fastest SSD is slower than the RAM. On Android, there is no swap!
In ZRAM unnecessary storage resources are compressed and then moved to a reserved area in the fixed RAM (ZRAM). So a kind of swap in memory.
This Ram is more free because the data then only about 1/4 of the former storage requirements have. However, the CPU has to work in more because they compress the data has (or unpack again when they are needed). The advantage clearly lies in the speed. Since the swap partition in RAM is much faster than this is a swap partition on a hard drive.
In itself a great thing. But Android does not have a swap partition, and therefore brings Android ZRAM under no performance gain as would be the case with a normal PC.
In normal PC would look like this:
Swap = swap file (on disk) -> Slow
ZRAM (swap in RAM) -> Faster than swap
RAM -> Quick
With Android, there is no swap partition, and therefore brings ZRAM also no performance boost.
The only thing that brings ZRAM is "more" RAM. Compressed by the "enlarged" so to speak of the available memory. That's on devices with little RAM (<256MB) also pretty useful. The S2 has 1GB but the rich, and more than. There must not be artificially pushed up to 1.5 GB.
After you activate the ZRAM also has 2 disadvantages. The encoding and decoding using CPU time, which in turn has higher power consumption.
Roughly one can say (For devices with more than 512MB RAM):
Without ZRAM: + CPU Performance | + Battery | RAM
With ZRAM: CPU Performance |-Battery | + RAM
For devices with too little RAM so it makes perfect sense. But who shoots the S2 already be fully complete RAM and then still need more?
Check whether you can ZRAM runs in the terminal with
free or cat / proc / meminfo
I hope it helps to understand zRam!!!!

Thanks for the info

Yeah thanks indeed for the info - so does this mean that we must have zram disabled because of low memory ?

no its very good for devices with less ram like 289mb and we have less ram,so its useless for higher ram devices with 800-1000,but that can u read in this guide

CALIBAN666 said:
no its very good for devices with less ram like 289mb and we have less ram,so its useless for higher ram devices with 800-1000,but that can u read in this guide
Click to expand...
Click to collapse
Yeah i misunderstood thanks for explaining !
But one more doubt - its good for us anyhow if we disable it will we get more free ram ?

in your statement zram is not battery friendly. ? am i correct. ? or not?

Sorry for too many questions mate - am the noobest guy here on xda that is why

not really because the system all the time creates virtual ram and distributed, just as if the ram is not needed, because then the virtual ram not needed and the system distributes it then falls to a normal ram, but I think it also comes to the what and how much the device is made for running multiple concurrent tasks, it is recommended.

nikufellow said:
Sorry for too many questions mate - am the noobest guy here on xda that is why
Click to expand...
Click to collapse
no problem bro,thats the reason why i open this thread.and hey im noob too

Thank you

one of the best information thread on forum
thank you mate

ewat said:
in your statement zram is not battery friendly. ? am i correct. ? or not?
Click to expand...
Click to collapse
Yes you are correct as cpu will have to do more work compresshog and de compressing stuff so more power will be consumed

Nice guide
But still i dont get it
post source : www.posting-a-post-at-tapatalk.com

@CALIBAN666
ramzswap != compcache. both using compressed data on memory. both even from the same person AFAIR. the different is ramzswap using compressed swap and compcache using compressed cache.
kernel 2.6.35 source code from samsung have ramzswap support, but you need user space program to enable it (need little patch to build it for sgy but it's easy).

irfanbagus said:
@CALIBAN666
ramzswap != compcache. both using compressed data on memory. both even from the same person AFAIR. the different is ramzswap using compressed swap and compcache using compressed cache.
kernel 2.6.35 source code from samsung have ramzswap support, but you need user space program to enable it (need little patch to build it for sgy but it's easy).
Click to expand...
Click to collapse
Can u help me on enabling ramzswap?? Zram is laggy
Sent from my GT-S5360 using XDA

hell_lock said:
Can u help me on enabling ramzswap?? Zram is laggy
Sent from my GT-S5360 using XDA
Click to expand...
Click to collapse
i follow this instruction but using build-in ramzswap.ko in sgy kernel source. the trivial part is compile rzscontrol for sgy. i forget how i build it but AFAIR need few patching. i'll post if i find it.

Not understood... Android has no swap? Then what is swapper for? Swapping partition?

I tried swapper for my galaxy y n i didnt liked it personally
By that time i had stock sd card
Im gonna try zram on my 16 gb class 6 sd card..i wish this thing works for me cuz after installing merruk kernel, my 50 mb ram got stuck
Sent from my GT-S5360 using xda app-developers app

swapp != zram
Rcain said:
Not understood... Android has no swap? Then what is swapper for? Swapping partition?
Click to expand...
Click to collapse
With swapper you can have an swap file or you can choose to partition your SD-Card to have an swap partition there. Swap is not used by default in Galaxy Y and swap space is optional not really needed in Android (or Unix/Linux in general).
On the other hand, zram is a whole different beast.

If I'm not mistaken a dev for ace2 already made it several month ago. It using init.d script to control the zram stuff

ROEHSOFT RAM Expander (SWAP)

Does this work as good as it says?
https://play.google.com/store/apps/...sMSwxLDEwMiwiY29tLnN3YXBpdC5leHBhbmRlci5kZSJd

its good for gaming and multitask
and good for xperia play with 512 mb ram you try it good

younesb said:
and good for xperia play with 512 mb ram you try it good
Click to expand...
Click to collapse
have you tried it?

insane5125 said:
have you tried it?
Click to expand...
Click to collapse
There are some benefits to SWAP yes, however using your MicroSD as RAM is far far slower than using actual RAM - so some things can play a little badly with it.
It also isn't a healthy thing to use when it comes to prolonging the lifespan of your MicroSD card as its using all those writes at an almost constant rate.
That being said though, enabling a SWAP partition on your MicroSD card is a somewhat easy thing to do and there are loads of other apps that will do this for free for you. I would not pay for this.

me tried in all roms me use my memory class 10 and good swap for me

Spizzy01 said:
There are some benefits to SWAP yes, however using your MicroSD as RAM is far far slower than using actual RAM - so some things can play a little badly with it.
It also isn't a healthy thing to use when it comes to prolonging the lifespan of your MicroSD card as its using all those writes at an almost constant rate.
That being said though, enabling a SWAP partition on your MicroSD card is a somewhat easy thing to do and there are loads of other apps that will do this for free for you. I would not pay for this.
Click to expand...
Click to collapse
So what your saying is it would let me have more multitasking but at the same time it would be slower.

First here is how to do that for free.
http://forum.xda-developers.com/showthread.php?p=32729884
Sent from my R800i using xda app-developers app
And yes I use that method, for me my Neo2Play gained some speed, less lags. But there is but, best is when used with fast card. I have 32GB class 10, on my old class 2 it wasn't so impressive.

Works great for me with 1105 MB swap RAM on Atomic GB 7.0.(2.3.7) Especially when using it with RAM Manager Pro on Hard Multitasking setting.
:laugh:

hehe
This sounds cool

amazing
AeroDelight said:
Works great for me with 1105 MB swap RAM on Atomic GB 7.0.(2.3.7) Especially when using it with RAM Manager Pro on Hard Multitasking setting.
:laugh:
Click to expand...
Click to collapse
amazing :laugh:

working
inuer said:
amazing :laugh:
Click to expand...
Click to collapse
I found a free version as well v2.0.2 and use it on my I337 S4 from ATT and works with not one force close