Shot on OnePlus November — Market. Stop wiping cache. Jan 5, Honeycomb Jan 5, Even after updates. I see this being suggested all the time and I facepalm.
People still think it's and don't realize how cache works in Android nowadays. Deleting it will make your phone slower and your battery drain faster for up to a month. It won't fix anything. Since Android Nougat, apps are no longer pre-optimized when installed. Instead, they are profiled during use, and then optimized when your device is charging.
This allows for better optimizations with less errors. Before the app is completely optimized, it runs with sub-optimal efficiency, meaning it will have lower performance and higher battery drain. Optimized code is stored in the dalvik cache folder.
It can take a long time to completely optimize all your apps. By wiping that folder, you are resetting the whole process. Wiping cache won't fix any issues , because if an error is found in the optimized code, the system will automatically cancel it. The vast majority of ROMs wipe system as part of the zip install. This means that in most cases you do not need to wipe system At this point, cache not dalvik cache is primarily used for recovery. You probably don't need to wipe cache, and cache is already wiped as part of a factory reset.
In most ROMs, dalvik cache is stored in the data partition, so if you do a factory reset, you've also wiped dalvik cache. In a few custom ROMs, especially on older devices with small data partitions, the ROM maker may have moved dalvik to the cache partition to provide you with more room for apps.
Watching the logcat while the system is booting I can clearly see that if an app changed, its dex file is invalidated and then regenerated. Yet still when I mention this anywhere I'm met with silence.
As if not even some ROM developers are aware of this and they're only doing this because everyone else does. An ideal answer would include references to the relevant code, so I would have a reference the next time this comes up. Am not aware of any Android version where the Dalvik was not invalidated on boot. Maybe the initial version 1. You need to look into the source tree and rebase it back to CupCake or Donut 1.
Most ROMs have apks that are odex 'ed, the cache is bundled into the apk itself as an external file. When you flash a custom ROM, and did not wipe the cache, the newer custom ROM's apk's will have a different dex file attached to it, and when the Dalvik goes through them, it sees the existing cached dex file found in the directory, and skips it, then when you run the app, you're guaranteed a force close or ANR Application Not Responding. So you can Wipe Cache but not Wipe Data , what is done effectively, is slotted in the newer apks in place, in which it has the settings retained.
The mileage will vary depending on what apps downloaded from the market settings would have changed by version bump quite likely. For best results it would be wise to perform both Wipe Data and Wipe Cache to ensure integrity and no program errors within the app itself. Yes that would mean the boot time would be slower but its initial once off moment. After that it would be booting quicker. Really in a nutshell, explicitly wiping the cache itself via CWM actually helps speed it up and ensure no residue from the previous version in place which could get munged in Now at this stage, am realizing your question so in all fairness, have not actually seen Android not performing the invalidating of the cache itself upon boot when flashing a new ROM..
It interacts with the native C code found in the dalvik directory tree which contains specific chipset instructions to interpret the bytecode within the apk to native CPU instruction set. CyanogenMod will have that ARMv6 in their source. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
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