For those who are still giving this a try there seems to be incompatibility with all ROMs that have switched to Unified build. The CM11 patch was intended to fix it, but I've not had a successful boot with the CM11 patch and any d2 unified builds. This may still work on certain ROMs that did not create unified builds based on CM, but otherwise this is likely obsolete. I will post an update if this is resolved through a workable patch!
It isn't here yet though and thanks to kszaq over in the Nexus 4 forums we have a Qualcomm-Optimized Dalvik library that is compatible with the S3 and improves performance of the Dalvik Cache on our phones!
I stumbled across this information in the Verizon S4 thread here which shows the benchmark improvements on the S4 and I figured, "why not our phone?" So I grabbed the 4.4.1 Gummy Rom and got to flashing. I did a scoring run in AnTuTu before and after and saw an increase of 500 points in the dalvik testing section.
In his FAQ he mentions that if you are on CM11 4.4.x, or something based on that build, that it may have an improved bionic library installed and it isn't necessary to flash it. Having said that I flashed both files and saw a performance gain. Try it on your 4.4 set-ups and let us know what works best. At the very least we can fill this thread with synthetic benchmark pics!
1.) Read the Q&A below!
2.) Copy both files (optimized-bionic and optimized dalvik) to your internal or external SD
3.) Reboot into recovery and make a nandroid (always!)
4.)flash optimized-dalvik (optimized-bionic is optional)
5.) Wipe Dalvik Cache in the Advanced menu of CWM and PhilZ (thanks CNexus!)
6.) Reboot and enjoy!
Note: If you get to the point where the phone won't boot just use the restore file (KOT49E) first and if it still fails to boot restore your nandroid.
Here is the original thread and please thank kszaq while you are there: http://forum.xda-developers.com/show....php?t=2546120
Here is the Q&A that kszaq set-up on his post:
Before using, please read the following Q&A.
Q: Will this void my warranty?
A: Yes. Flash at your own risk.
Q: Can I use it?
A: Yes, if you're on any 4.4/4.4.x ROM.
Q: How does this work?
A: This patch consists of two files that include optimized bionic and Dalvik libraries for any KitKat ROM.
Q: What is bionic?
A: It is a vital system library that provides i.a. basic math and memory access functions to every other library and application in Android.
Q: What is Dalvik?
A: In short, Dalvik is a virtual machine in which every not-native-code app runs. You can read more about it in a Wikipedia article.
Q: How do I benefit from this patch?
A: In two ways: bionic patch provides faster memory access and optimized some of the math operations, dalvik provides optimized Dalvik Virtual Machine library that allows faster code execution.
Q: Do I need this patch?
A: It depends on what ROM you are using:
Originally Posted by xboxfanj
if you're on stock ROM, you'll benefit from flashing both bionic and dalvik patches, if you're using a custom ROM, you most probably don't need bionic patch, as these are already included in most custom ROMs. You'd benefit only from flashing dalvik patch (if it's not already included by your ROM maintainer, of course), don't use the bionic patch on CyanogenMod, PSX and probably others, because they already have more optimized versions!
A: As for bionic - I don't know. Maybe that's because Google didn't want to include vendor-specific optimizations in AOSP or maybe simply because Qualcomm never posted them in Android Code Review to be merged. As for dalvik - because they are closed-source. Here'a a good explanation by @xboxfanj:
Originally Posted by xboxfanj
Part of the point of Nexus devices is that AOSP can produce nearly identical images minus GApps. Google would not use a proprietary dalvik as that is one of the core libraries. Using a proprietary dalvik would undermine AOSP. Although, an open libqc-dalvik or even just giving us that binary would be nice. Google could have a device specific extension similar to the adreno extensions onto renderscript and egl for dalvik. Proprietary dalvik won't happen, but an adreno extension could be cool.
A: These have been authored by Qualcomm. Bionic patch comes from Code Aurora Forum, Dalvik library has been extracted from Moto X 4.4. ROM. Another good read by @xboxfanj:
Originally Posted by xboxfanj
CAF has all Qualcomm's bionic patches and slight dalvik tweaks, however, the dalvik patches that are used here in the Moto X and any QCOM (non-Nexus) device, are mostly closed source. If you look at the change here: https://www.codeaurora.org/cgit/quic...739455dfd3cf57
TLDR: QCOM's dalvik optimizations are closed source, so we are forced to use their binaries.
Remember to thank @xboxfanj for his very useful posts!
Q: What is the reason for including installd file?
A: The installd binary is from stock Nexus 4 ROM and is included for compatibility with CyanogenMod and CM-based ROMs. This is because CyanogenMod changed installd to work with their dexopt-on-cache (see here: https://github.com/CyanogenMod/andro.../cmds/installd) and it you don't flash stock installd you'd get hundreds of FCs and unusable ROM.
Q: How do I use this patch?
A: Simple flash it over your current ROM in recovery. Remember to wipe Dalvik Cache after flashing. Full wipe is not needed.
Q: How do I revert?
A: Simply flash over your current ROM and wipe Dalvik Cache afterwards. Full wipe is not needed.
Q: Can I flash it over an ODEXed ROM?
A: Yes, but it is strongly recommended to use a deodexed ROM if you want to use Dalvik patch.
Q: How will this affect my battery life?
A: It will be at least the same, if not better. Better performance = less CPU time spent on calculations = better battery life.
Q: I don't see any performance gains in some app, why is that?
A: The dalvik patch doesn't affect apps that use native libraries, i.e. you won't see much performance gain in Chrome etc.
Q: I'm on X kernel, can I use it?
A: Yes, use it with any kernel you like.
Q: Can I use it on other devices?
A: Yes, you can use this patch on every Krait device that uses AOSP-based ROM (examples: Nexus 5, Nexus 7 2013). Don't flash it on stock ROM on non-Nexus devices, as they already include these optimizations (that includes Galaxy S4 and HTC One Google Play editions!).
Q: What if I use it on stock ROM and OTA arrives? Can I install the OTA straight away?
A: You can't. You have to revert to stock libraries first. Keep in mind that every modification to stock ROM can mean problems when installing an OTA. You should revert to fully stock ROM to properly apply an OTA. For your courtesy, there's a revert ZIP attached for KRT15S and KOT49E ROMs. Remember that the safest way it to flash system.img from a factory image before applying an OTA once you made modifications to your /system partition!
Q: Can I use these patches on 4.4.1/4.4.2 stock ROM (KOT49E/KOT49H)?
A: Yes, you can.
Q: Can I use ART with this patch installed?
A: Yes, but you won't see any performance gains. In fact, with this patch Dalvik is faster than ART. I suppose ART will supersede Dalvik in performance in the future, but not yet.
Q: Where can I see some benchmark results before I flash?
A: Head over to Nexus 4 Benchmarks thread.
Q: Do I need to be rooted to flash this?
A: No. The only thing you need is custom recovery (CWM, TWRP etc.).
Q: Do I have to flash these patches every time I install an update/new ROM?
KOT49E revert ZIP == KOT49H revert ZIP
kszaq for the files and the spectacular Q&A
Xboxfanj for his contribution to the Q&A
prsterero for trying it on his S4 first
Google for taking a company name and turning it into common household verb...and for the awesome library files that were on their device
and I want to thank everyone who takes the time to develop on XDA. All of you make our devices do amazing things
I am limited to 8 thanks a day, but rest assured I will meet my quota!