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Root What is it??

D

dragg5inbody

Member
What is Jit? I see on white widow there is an option to turn it off...I keep seeing you guys talk about it but when I search for it on the forums to learn about it, it comes up with 0 results...:mad:
 
dragg5inbody said:
Gee thanks :rolleyes:
Click to expand...

My intent was not to be rude, although I can see why you took it that way. This site is great for info but when it comes to the real techy stuff there are few around here that can or will answer questions like yours. I really was trying to help you find the answer to your question.
 
ok thanks haha i thought you were just being a dick...And after i posted the question i thought to my self i should just google it. im still kinda confused tho
 
Yeah unless you're a Linux guy it's a little difficult to understand. I'm definitely not a Linux guy, yet, I'm working on learning it. But from what I can understand is that at bootup the JIT compiler trys to optimize the Android code to make running apps faster. The problem is that using it in 2.1 makes your ROM unstable for the most part, although some have had success it does seem to be hit/miss. But 2.2 includes JIT which is why you will get better linpack scores on 2.2 over 2.1.
 
JIT = just in time compiler.

JIT does increase linpack scores, but linpack really means nothing. My experience with JIT has led me to believe, yes it is faster, but it can also create more lag. Which I know doesn't make sense, but running White Widow for example, I got 4.8 linpack scores with JIT, and 3.2 without JIT. I also had much more random reboots and craziness happen with JIT. I find my phone to be much faster without it.
 
If it isn't making things laggy or causing problems I would continue to use it.

I have used a few roms that worked much better with it off.
 
I'm not noticing any degradation in performance after disabling JIT. I run xtrROM3.03. JIT enabled caused issues with DoggCatcher which I use daily, so no JIT for me.
 
ok i see now. thanks guys. if for sum reason it starts geting laggy or buggy ill try it without it. I can always turn it back on if it makes things worse right?

edit:

also just installed and ran linpack....
results...Im seeing much lower numbers than all you guys and dont understand why...

max 710 mhz
min 528 mhz = First try was 2.898 mflops time was 2.342 sec.
second try was 3.014 mflops
time was 1.8 sec. It doesnt seem very consistant

max 768 mhz
min 528 mhz = first try was 3.019 mflops with 1.68 sec.
Second try was 3.216 mflops and i forgot to record the time.

are these numbers good? You guys are all in the "4's"....
 
Did you set setcpu to performance first instead of on demand? Also it depends on what you have running at the time. Is your phone using quite a few widgets?
 
Basically, if you are on a 2.2 ROM you should have JIT enabled (runs great and runs on what its made for). However if you are on a 2.1 ROM I suggest not using JIT (it was never meant to run on 2.1)
 
Papadroid said:
Did you set setcpu to performance first instead of on demand? Also it depends on what you have running at the time. Is your phone using quite a few widgets?
Click to expand...

No, it was on demand...should I always have it on performance? Or performance just for tests?
And I have 4 widgets.
 
surgeon0214 said:
Basically, if you are on a 2.2 ROM you should have JIT enabled (runs great and runs on what its made for). However if you are on a 2.1 ROM I suggest not using JIT (it was never meant to run on 2.1)
Click to expand...

Ok, ill try turning it off. What is the best way to do this? 1.) uncheck it 2.) reboot?
 
Do you guys know off the top of your head as to where JIT check box is? Ive been searching for it and I cannot find it, I know Ive seen it before...
 
dragg5inbody said:
Do you guys know off the top of your head as to where JIT check box is? Ive been searching for it and I cannot find it, I know Ive seen it before...
Click to expand...

I wasn't aware that enable/disable JIT was a check box option. Apps2sd is on certain ROMs. Many ROMs have JIT enabled by default as well.
 
dragg5inbody said:
Yeah man im pretty sure when I first flashed white widow I saw a check box for enable/disable JIT...Now I cant find where it is at
Click to expand...

This is from andrizoid on the White Widow ROM page: (this was the only way I was aware of to toggle that).
New Patches

Ask and ya shall receive. Due to the overwhelming amount of requests for JIT, JIT is now enabled by default. here are patches to turn them on/off. I got the basic idea from Zach.Xtra
Flash these from recovery, wipe, reboot.

Jit On. <---JIT is on by default, but if you turn it off and would like to turn it back on, flash from recovery, clear dalvk, reboot.

Jit Off. <---Flash from recovery, wipe dalvik and reboot. Will turn off JIT.
 
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