Develop Bugs

[Q] Memory management

Hi Arc Users,
Do you guys encounter low memory after long period of usage? It seems like the memory does not free up after using the phone for a long time. I mainly use the phone for FB, Camera and messaging.
When the phone hits like 50+MB ram or so it starts to slow down and if it goes lower than 40MB my home screen starts to lag and the app icons take a few secs to load every time i return to home screen. I'll usually reboot the phone but its quite a pain considering the boot timing for my phone is rather long, like close to 1 min.
What are the possible solutions? I've heard that advanced task killers are unnecessary for Gingerbread. If thats the case, how do I free up more memory or have better memory management for the Arc?
Am a first time android user, appreciate any advice from you guys
Thanks!

___________________
+1

Root is the solution. Delete apps and services which you do not use.
I haven't any problem either when free ram goes down to 30MB and i don't use a taskiller.

Just what are you doing when you run out of ram? Never did I run out of ram yet. Running ram hungry games will free up more what is needed as I experienced. When I return to homescreen, it takes a while (around 2 secs) because it will free up ram from the game, then load the homescreen launcher from start/scratch.

Same here but my Arc works fine, even with 30-40MB RAM, so it isn't a real problem.
But it would be nice from SE to make 400-450MB of the 512MB RAM available for the user.
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Flo95 said:
But it would be nice from SE to make 400-450MB of the 512MB RAM available for the user.
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Click to expand...
Click to collapse
What? That is a completely pointless excercise if you understand how ram is handled by the os.
You need to root and remove bloat, check ya settings etc to get better performance. I found letting things constantly access the network was a juice eater, I don't want fb to check every 4 seconds, I update it when I want to read it lol
I use a task manager, but only because I like to see what is running and using resources. I rarely actually kill any apps, just occasionally a few things I rarely use. Even then it fills the space with other stuff.
:edit: sorry flo95, that sounded a bit crappy, no bad attitude was intended.
Sent from my LT15i using XDA App

This is the solution...https://market.android.com/details?id=com.lim.android.automemman&feature=search_result
not a task killer... a memory manager that enhances googles memory management.

mariolouis said:
Just what are you doing when you run out of ram? Never did I run out of ram yet. Running ram hungry games will free up more what is needed as I experienced. When I return to homescreen, it takes a while (around 2 secs) because it will free up ram from the game, then load the homescreen launcher from start/scratch.
Click to expand...
Click to collapse
I do not play games with my Arc. I just used facebook, MSN, Camera and messaging occasionally throughout the day. Medium usage.
It runs smoothly for several days but maybe after a week or two, the RAM starts to get low.
im_iceman said:
This is the solution...
not a task killer... a memory manager that enhances googles memory management.
Click to expand...
Click to collapse
Thanks! Working so far... will monitor after a week or so.

Try a cache cleaner also will free up some space for ya
Sent from my LT15i using XDA Premium App

I use battery guard as a task killer. It comes with a widget where you can see the available amount of ram.
I'm happy about it. Though a lot of people say a task killer doesn't help I have no negative experience using this one... and I never go below 130 ram.
I still think it does help to close tasks that otherwise keep running in the background... But I'm new on android so I could be wrong.

Hey guys
Have you tried this script
http://forum.xda-developers.com/showthread.php?t=1111145
maybe this can help w/o having to install apps or task-killers. Should work on Xperia Arc but I don't guarantee it.

That script seems to do basically the same thing as auto memory manager.. (per my previous post..)..
PS.. I currently have mine set to aggressive.

Whats using all of our ram?

I have been trying to figure out why the Note has so little of the 3 gb of ram available at any given time. After a fresh boot, I might have 1.3 - 1.5 available, but that quickly disappears.
I have frozen all unnecessary apps with Titanium Backup, yet after launching just a few apps, I'll be down to 300 mb or so. Looking at the active applications list in task manager, the apps listed are nowhere near to adding up to over a gb of ram.
Tablet seems to be performing fine, I'd just like to know where the ram is going and why. Especially when tablets with 2 gb of ram seem to have much more free at any given time.
Sent from my SM-P600 using Tapatalk

i am with you on this issue. would like to find out for my self as well! constantly having to clear ram.
youtube, gmail, and browers = 2.1 gb / 3 gb ...
what the heck?
i constantly have to go back and clear apps, this is such a let down because my htc one could load much more than this, and every1 knows, htc one is no where near the spec of note 2014..

I'm not rooted but I noticed the same thing with the ram, I thought rooting and freezing some Samsung apps, specially Knox stuff, would free up a lot of ram. I'm starting to think that it's not a big deal and Android frees up ram as needed before it starts to get laggy (of course it's not perfect). I think lag issues are somewhere else and not so much in freeing up more ram. Don't you feel anyway that your note is a lot faster after rooting and freezing those apps? As far as I know most rooted users feel that way...(?)
Sent from my SM-P600 using XDA Premium 4 mobile app

I have rooted mine about two weeks ago then froze all sort of junk listed in here and some other I identified mysefl. Now my used ram remains around 500 clean and around 700-800 when I open few apps. So guys the secret is getting a lot of useless apps frozen especially knox stuff.

greyhulk said:
I have been trying to figure out why the Note has so little of the 3 gb of ram available at any given time. After a fresh boot, I might have 1.3 - 1.5 available, but that quickly disappears.
I have frozen all unnecessary apps with Titanium Backup, yet after launching just a few apps, I'll be down to 300 mb or so. Looking at the active applications list in task manager, the apps listed are nowhere near to adding up to over a gb of ram.
Tablet seems to be performing fine, I'd just like to know where the ram is going and why. Especially when tablets with 2 gb of ram seem to have much more free at any given time.
Sent from my SM-P600 using Tapatalk
Click to expand...
Click to collapse
Android is based on Linux. Android and Linux both run better when they use as much ram as possible. If you Google Android ram usage you can find a couple of interesting articles about this.
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nrage23 said:
Android is based on Linux. Android and Linux both run better when they use as much ram as possible. If you Google Android ram usage you can find a couple of interesting articles about this.
Sent from my SM-P600 using XDA Premium HD app
Click to expand...
Click to collapse
Yup, stuff is kept in the RAM as much as possible to increase performance. As soon as an app requires more RAM than is available, the system moves apps from the RAM as required. Clearing the RAM only increases the time it takes to start an app next time.

I would be disappointed if its NOT beeing used...
Sent from my GT-I9300 using XDA Premium 4 mobile app

delanvital said:
Yup, stuff is kept in the RAM as much as possible to increase performance. As soon as an app requires more RAM than is available, the system moves apps from the RAM as required. Clearing the RAM only increases the time it takes to start an app next time.
Click to expand...
Click to collapse
People are used to Windows needing free ram and do realize that Linux is a completely different animal altogether.
Here is the article for those that want to understand the ram usage.
http://www.androidcentral.com/ram-what-it-how-its-used-and-why-you-shouldnt-care
http://www.linuxatemyram.com/

Okay, guys. Disclaimer: I'm an IT professional and the Mobility expert for my company. I know how the RAM is used and why. I'm just curious as to what is using it. Especially in comparison to the Nexus 10, which has 2/3 of the RAM and has approximately the same amount available at any given time.
I wasn't looking for assurance that this is how it's supposed to work. I'm curious as to what you guys think is actually filling it up. Since I have disabled most unnecessary processes and only run a few apps at any given time, I can't see why so little is free.

greyhulk said:
... I'm curious as to what you guys think is actually filling it up. Since I have disabled most unnecessary processes and only run a few apps at any given time, I can't see why so little is free.
Click to expand...
Click to collapse
The objective of good android RAM management is to keep RAM full of the the highest priority apps. This enables faster and smoother response. The apps that are in RAM on your device will be different than on someone else's device. If you are curious about how android decides what put in RAM and what to take out, do a google search on "android process lifecycle"

if you're concerned about ram usage go to dev settings and change the "Limit background processes" to something more you liking.

Using a lot of RAM... for some reason?

Ok so I was running an app to check on CPU speeds (unrelated research) when I noticed that this same app was saying I only had 340mb of RAM free...
This seemed a bit strange, considering this tablet has 3GB of RAM on board, and I'm not really running anything at the moment.
I went into the storage setting page, and looked at running processes, and it says that I am using 2.5GB of my RAM.
but... if I add up all the ram usage on all the running processes, it only adds up to about 500mb....
So what is using up the other 2gb?
If anyone has any suggestions, it'd be nice, as at the moment it seems I only have 1gb of usable RAM in this device...
EDIT:
Nevermind, I think I solved it... sort of. I found that the ram clearing button is in a different place than I remember, and I have managed to clear out some more space... though even after a full reset 1.5gb of ram is immediately being used. Seems a lot.
Though this is a stock rom etc so I suspect thats normal.

electrical tcfpain
nirurin said:
Ok so I was running an app to check on CPU speeds (unrelated research) when I noticed that this same app was saying I only had 340mb of RAM free...
This seemed a bit strange, considering this tablet has 3GB of RAM on board, and I'm not really running anything at the moment.
I went into the storage setting page, and looked at running processes, and it says that I am using 2.5GB of my RAM.
but... if I add up all the ram usage on all the running processes, it only adds up to about 500mb....
So what is using up the other 2gb?
If anyone has any suggestions, it'd be nice, as at the moment it seems I only have 1gb of usable RAM in this device...
EDIT:
Nevermind, I think I solved it... sort of. I found that the ram clearing button is in a different place than I remember, and I have managed to clear out some more space... though even after a full reset 1.5gb of ram is immediately being used. Seems a lot.
Though this is a stock rom etc so I suspect thats normal.
Click to expand...
Click to collapse
You probably aren't using all 2.5GB for actual running programs.
Windows 7 does a great job of managing money. If it has any unused memory it will hold often used programs or data in memory in case it's needed. If a running program needs that memory it's quickly shifted. Otherwise when you reopen that program you recently closed, it may load quickly from memory rather than from the drive. I suspect Android does things similar.
Modern systems programmers consider "free" memory to be wasted, so they put it to the best use they can anticipate. That gives you the benefit of all memory as often as possible. If they only allowed the memory to be used for what's needed right now, your Note would only have about 1 GB memory, and would be considerably slower.
It's a little like having the cook wash your car while waiting three hours for the turkey to cook. You get both the turkey and the car wash.

jnichols2 said:
You probably aren't using all 2.5GB for actual running programs.
Windows 7 does a great job of managing money. If it has any unused memory it will hold often used programs or data in memory in case it's needed. If a running program needs that memory it's quickly shifted. Otherwise when you reopen that program you recently closed, it may load quickly from memory rather than from the drive. I suspect Android does things similar.
Modern systems programmers consider "free" memory to be wasted, so they put it to the best use they can anticipate. That gives you the benefit of all memory as often as possible. If they only allowed the memory to be used for what's needed right now, your Note would only have about 1 GB memory, and would be considerably slower.
It's a little like having the cook wash your car while waiting three hours for the turkey to cook. You get both the turkey and the car wash.
Click to expand...
Click to collapse
I'm guessing you mean android, not windows 7
Though I imagine both do the same thing lol

nirurin said:
I'm guessing you mean android, not windows 7
Though I imagine both do the same thing lol
Click to expand...
Click to collapse
I used Windows 7 as an example because I know how it works. Like you, I imagine Android 4.3 does the same thing.

I was wondering about this as well. On my Note 2, when I clean the ram, it will go to 480-500 / 1.75g on this tab, ext I could get is 1.33/2.75.......
I went through and turned off a lot of the apps, it helped free up a little bit.
Does anyone have a list of the apps that are safe to turn off?
:beer:
Sent from my SM-P600 using Xparent Cyan Tapatalk 2

I have LTE version with Snapdragon and when I start the tablet, it uses about 890MB of 2,35GB available (yes, it has 3GB RAM, but graphic processor uses some of this RAM)... When it loads all apps to RAM (about 50 of them, we know android do this) and I start few apps(FB, Gmail, Chrome, Hangouts for example), I still use only about 1,3GB of RAM... So almost 1GB is still free

In Android having too much free ram is not a good thing. Let your apps use it, you don't have to worry about not having enough ram, OS manages it well for you.

ddavtian said:
In Android having too much free ram is not a good thing. Let your apps use it, you don't have to worry about not having enough ram, OS manages it well for you.
Click to expand...
Click to collapse
+1
Android is a mobile OS which means that it can backup and restore not needed apps if necessary and the 3GB are only the runtime memory beside this it can use the whole internal memory for "running" apps. So long Android got enough memory it holds all apps in memory which speed up the whole device. Therefore it is positive that the Note use his whole 3GB memory and don't think that killing apps or free memory will be a good idea. It will slow your device and produce lags.

ddavtian said:
In Android having too much free ram is not a good thing. Let your apps use it, you don't have to worry about not having enough ram, OS manages it well for you.
Click to expand...
Click to collapse
Elim said:
+1
Android is a mobile OS which means that it can backup and restore not needed apps if necessary and the 3GB are only the runtime memory beside this it can use the whole internal memory for "running" apps. So long Android got enough memory it holds all apps in memory which speed up the whole device. Therefore it is positive that the Note use his whole 3GB memory and don't think that killing apps or free memory will be a good idea. It will slow your device and produce lags.
Click to expand...
Click to collapse
They are both right. Android is based on linux. Linux uses ram very effectively to cache apps and data to speed up your system. When something needs ram it removes a different app or data from the ram to keep moving. It works totally different from Windows. Check out this article.
http://www.androidcentral.com/ram-what-it-how-its-used-and-why-you-shouldnt-care

Every day since Android came out someone asks this question somewhere... Is Google offline?
Sent from my SM-P605 using XDA Premium HD app

If you want to change how your ram is managed, and you have root, you can use the v6 supercharger or a simple minfree setting app. V6 is in the developer section of the general android forum on this site. I've found that m ram fills up from cached apps. V6 will let you auto clear however often you want.

Free RAM

Hi,
I own a G3 with 2 GB of RAM, like my previous Nexus 4.
In the N4, with CM-11 or AOSP, and with the same apps that I use in the G3, the free amount of memory was more than 1 GB all the time,
but in the G3 I have 300-400 MB since a few minutes of restart it, and only 500-600 just after the restart.
Any solution to this? Really is relevant?
Thanks!

bartito said:
Hi,
I own a G3 with 2 GB of RAM, like my previous Nexus 4.
In the N4, with CM-11 or AOSP, and with the same apps that I use in the G3, the free amount of memory was more than 1 GB all the time,
but in the G3 I have 300-400 MB since a few minutes of restart it, and only 500-600 just after the restart.
Any solution to this? Really is relevant?
Thanks!
Click to expand...
Click to collapse
Having also the almost same amount of free ram and for me, it pretty much sticks there, no matter how many apps are opened, sometimes there is a launcher redraw, but except of that i haven't faced any problems at multitasking.
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Tectas said:
Having also the almost same amount of free ram and for me, it pretty much sticks there, no matter how many apps are opened, sometimes there is a launcher redraw, but except of that i haven't faced any problems at multitasking.
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Click to expand...
Click to collapse
yes, which most noticeable is in the redraw of the launcher, especially when closes the gallery app

bartito said:
yes, which most noticeable is in the redraw of the launcher, especially when closes the gallery app
Click to expand...
Click to collapse
This can easily be fixed though, with a third party launcher with persist in memory enabled.
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Tectas said:
This can easily be fixed though, with a third party launcher with persist in memory enabled.
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Click to collapse
Yes, but this really don't solves the issue. Only masks

bartito said:
Yes, but this really don't solves the issue. Only masks
Click to expand...
Click to collapse
Well, i must confess it's not a real issue to me, I'm using pretty many widgets and the only one i really notice it is the clock/weather widget, everything else is almost instantly back up.
But that's just me. For sure it will be way better when the first aosp roms come up, because of their way lower memory footprint.
Gesendet von meinem LG-D855 mit Tapatalk

Wait for CM11 come to our G3
Then compare the RAM usage
Sent from my LG-D855 using XDA Free mobile app

Free ram is wasted ram.
Android, or more specifically Linux doesn't use ram in the same way as Windows would, it retains things in memory so that you can quickly resume it when you need it (therefore having less impact on the CPU and battery).

Lennyuk said:
Free ram is wasted ram.
Android, or more specifically Linux doesn't use ram in the same way as Windows would, it retains things in memory so that you can quickly resume it when you need it (therefore having less impact on the CPU and battery).
Click to expand...
Click to collapse
But on this device it is not being managed properly. At least the launcher should be kept in memory without the user having to root and do it him/herself.
These problems were fairly common when high end devices had 1gb ram but with a relatively light launcher and 2gb ram there is no excuse IMO.
Sent from my LG-D855 using XDA Premium 4 mobile app

bobsie41 said:
But on this device it is not being managed properly. At least the launcher should be kept in memory without the user having to root and do it him/herself.
These problems were fairly common when high end devices had 1gb ram but with a relatively light launcher and 2gb ram there is no excuse IMO.
Sent from my LG-D855 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I have had no issues with the launcher redrawing, I did have some minor lag when I was purely stock, but removing a few LG apps that I would never use has solved this.

Lennyuk said:
Free ram is wasted ram.
Android, or more specifically Linux doesn't use ram in the same way as Windows would, it retains things in memory so that you can quickly resume it when you need it (therefore having less impact on the CPU and battery).
Click to expand...
Click to collapse
How many times did you tell this chant allready^^
And sure you're true, but the well known (from the galaxy s3 at least, which is my former device) launcher redraw is based on the available amount of ram, the thing isn't really the "free ram" here, it's more the amount of ram that can be freed up on demand to load something new into it and the launcher redraw points into the direction, that there sometimes is a shortage, because the data of the launcher has to be released, because there wouldn't be enough ram for the new application. This isn't the big issue, the launcher has no priority at this point and it takes a big amount of ram, so it's understandable that the system releases it's memory if there is more demand than currently "free". So the current "problem" is less related to "free" ram, but the lack of ram persistance of the launcher, combined with the amount of usable ram for the user, which can lead to freeing the memory of the launcher more often. This would happen to every launcher without persistance at every amount of available ram tough some times, but the higher the available ram, the less often it will happen.
That's not an issue for me, like already said, but the point behind it is understandable to me.

I've noticed in the kernel settings that 600mb of Ram is being used as ZRAM. Could this be an issue?
Sent From My LG G3 Using Tapatalk

Lennyuk said:
Free ram is wasted ram.
Android, or more specifically Linux doesn't use ram in the same way as Windows would, it retains things in memory so that you can quickly resume it when you need it (therefore having less impact on the CPU and battery).
Click to expand...
Click to collapse
I'd still prefer to have 'free or wasted' RAM, at least you know you have some RAM spare plus apps do get killed faster and some don't retain all the information in the RAM (Asphalt 8 and other big games) and restart the app (when playing games and then browsing), but 3gb is doing fine for me

Tectas said:
How many times did you tell this chant allready^^
And sure you're true, but the well known (from the galaxy s3 at least, which is my former device) launcher redraw is based on the available amount of ram, the thing isn't really the "free ram" here, it's more the amount of ram that can be freed up on demand to load something new into it and the launcher redraw points into the direction, that there sometimes is a shortage, because the data of the launcher has to be released, because there wouldn't be enough ram for the new application. This isn't the big issue, the launcher has no priority at this point and it takes a big amount of ram, so it's understandable that the system releases it's memory if there is more demand than currently "free". So the current "problem" is less related to "free" ram, but the lack of ram persistance of the launcher, combined with the amount of usable ram for the user, which can lead to freeing the memory of the launcher more often. This would happen to every launcher without persistance at every amount of available ram tough some times, but the higher the available ram, the less often it will happen.
That's not an issue for me, like already said, but the point behind it is understandable to me.
Click to expand...
Click to collapse
Launcher redraws are down to poorly coded apps, not the ram available on the device. Keeping more free ram is effectively just a dirty workaround to solving the issue that you are using a poorly coded app. Yes in this case its a stock app and there is little excuse for it, but it doesn't change the fact that it is the app at fault, not the devices ram. You shouldn't just keep throwing more ram at a device to counter the fact that people are not optimising their apps properly.
If the launcher had persistance then the device would probably be killing something else in its place, and I don't know about you but I like all my apps to work, I don't want any of them killed, therefore I would rather have a better coded app that meant that nothing needed to be killed. 2GB of ram is plenty for a device like this to cope just fine.
FYI - I removed LG's "voice" app and I have had plenty of free ram ever since.

Guys, stop blaming RAM management, it's done exactly as it should be done in Linux / Android. As Lenny said (multiple times) free RAM is wasted RAM. I'd rather see the phone use it. The problem, if there is one, is the launcher that doesn't handle "lack of free RAM" as it should. 3rd party launchers do that well (Nova for example), so LG is the one that needs to be blamed here. Having more free RAM would not solve the issue, only delay it.
On a related note, perceived lag might also comes from that: some people always close all open apps to free some RAM (for no reason), so restarting an app from scratch would indeed cause a small lag. If you keep them all in memory, perceived lag is reduced (not completely gone, but reduced a lot).

Lennyuk said:
Launcher redraws are down to poorly coded apps, not the ram available on the device. Keeping more free ram is effectively just a dirty workaround to solving the issue that you are using a poorly coded app. Yes in this case its a stock app and there is little excuse for it, but it doesn't change the fact that it is the app at fault, not the devices ram. You shouldn't just keep throwing more ram at a device to counter the fact that people are not optimising their apps properly.
If the launcher had persistance then the device would probably be killing something else in its place, and I don't know about you but I like all my apps to work, I don't want any of them killed, therefore I would rather have a better coded app that meant that nothing needed to be killed. 2GB of ram is plenty for a device like this to cope just fine.
FYI - I removed LG's "voice" app and I have had plenty of free ram ever since.
Click to expand...
Click to collapse
Protagoras said:
Guys, stop blaming RAM management, it's done exactly as it should be done in Linux / Android. As Lenny said (multiple times) free RAM is wasted RAM. I'd rather see the phone use it. The problem, if there is one, is the launcher that doesn't handle "lack of free RAM" as it should. 3rd party launchers do that well (Nova for example), so LG is the one that needs to be blamed here. Having more free RAM would not solve the issue, only delay it.
On a related note, perceived lag might also comes from that: some people always close all open apps to free some RAM (for no reason), so restarting an app from scratch would indeed cause a small lag. If you keep them all in memory, perceived lag is reduced (not completely gone, but reduced a lot).
Click to expand...
Click to collapse
I didn't really blame the ram nor the ram management, as i said, it's the launcher taking that much ram, that's why it probably get's killed earlier than others and yes, sure, that's an optimization issue. I also didn't say the system does anything wrong with it, i just tried to point out why it acts that way regarding the launcher and I also didn't say that it really is free ram I'm talking about, but available ram (with which i meant ram available for userspace apps, not ram amount not used).
Also I've never said more ram would be the fix, i said it would just happen less, because that's simply how it works and also like i said, it's not an issue for me, because i'm aware why it acts that way and even when it get's killed, it's almost instant back up, i just said, i can understand that someone could be annoyed about it.

Protagoras said:
Guys, stop blaming RAM management, it's done exactly as it should be done in Linux / Android. As Lenny said (multiple times) free RAM is wasted RAM. I'd rather see the phone use it. The problem, if there is one, is the launcher that doesn't handle "lack of free RAM" as it should. 3rd party launchers do that well (Nova for example), so LG is the one that needs to be blamed here. Having more free RAM would not solve the issue, only delay it.
On a related note, perceived lag might also comes from that: some people always close all open apps to free some RAM (for no reason), so restarting an app from scratch would indeed cause a small lag. If you keep them all in memory, perceived lag is reduced (not completely gone, but reduced a lot).
Click to expand...
Click to collapse
I had much the same Ram usage on my Nexus 5. I've been looking at an app that shows what is actually using the Ram and at any given time there's only around 1gb in actual use, the rest is cached files. All pretty normal. Incidentally, I've turned the Zram off using faux clock as you really don't need it in a 2gb device and you get a very slight performance boost and battery increase with it off.
Sent From My LG G3 Using Tapatalk

I just rooted mine and froze a load of apps I do not use and its defo speeded it up having around 600-750mb free

You could always go into developer options and turn on strict mode that will kill everything as soon as you leave it .... It has to free up ram huh ......
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Epix4G said:
You could always go into developer options and turn on strict mode that will kill everything as soon as you leave it .... It has to free up ram huh ......
Sent from my SM-N900P using Xparent BlueTapatalk 2
Click to expand...
Click to collapse
That would work You could also leave your phone switched off, to make sure it doesn't use any RAM at all

How much free RAM are you guys getting?

Im on 10.5. 4.4.2 NFB. Debloated rom. Stock kernel and touchwiz. Most services frizes. Even samsung accounts.
Omly get 1gig Free RAM.
WHat the heck is the rest of the 3gig RAM being used on?:silly:

It is used for caching etc. Same on Linux.

pibach said:
It is used for caching etc. Same on Linux.
Click to expand...
Click to collapse
i have about 60% free , maybe about 1.5gb in use ?

Yes, after fresh boot mine shows 2,71 GB total, 1,6GB free, 0,98GB in use.
But after launching (and closing) couple of apps it should use all RAM for caching finally. You do not get it back free even after killing the app. So this number doesn't say anything. What's in the cache depends on what you have been doing so far.

Don't forget a considerable chunk of ram is used for the screen's memory. The Nexus 10 has the same screen resolution as the Tab S and it's overall free memory is reduced due to screen resolution.
Sent from my Nexus 10 using XDA Premium HD app

1 GB is reserved for swap. Usage can be viewed with disk info app.

mine varies around 1GB free however not all the time and why i feel that 3GB of my S allows it run much better than my Pro 10.1
i really dont care about the status of free vs used etc.. UNLESS like i experience on my personal computers it becomes clear a device just needs more to function smoothly.
my example i have a Mac Mini that was running sluggish and with 4GB ram it generally had about 800MB free during my workday. i installed 8GB ram and now it generally sits at 5.7GB used all day where when it had 4GB it sat at 3.2GB used
point is the Mini wanted about 5-6GB Ram to settle in around but would run on 4GB if it had to with constant work to keep 4GB limitation working.
i find that with having a 10.1 Pro and 10.5 S that more than 2GB is needed and 3GB seems to be enough but can tell when the 1GB is missing on my Tab Pro.

Using clean master, genic and disable many Samsung applications I've reach 1,37 Gb used of 2,7 total.
No lag using games and chrome beta.
Some application is possible to disable only via the drawer.

Correction... 1,33... :silly:

I get 18xx after cleaning with task manager