QUOTE(mtxx @ Oct 18 2014, 02:56 PM)
Here are my findings.
Apps that are kept in ram do cause significant increase in wake lock
wake lock with greenify is 2%,
without greenify (5-14% depending on a number of background app kept)
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I left several apps in background and left then idle for 6 hours.
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Strangely drive was killed despite ample amount of ram still available.
Wake lock is significantly higher than my previous test with more background apps open.
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Greenify works by significantly reduces wakelocks. But the results is not that jaw dropping. If u just clear your apps and go to sleep, the results will be the same. Greenify helps by auto force stop your background apps when it's not in use during idle. Just like iOS let unused app freeze and stop wasting resources.
Extra wake lock seems bad, and it does impact battery life, but the impact is very minimal. I done 3 observation.
A 2% wake lock causes 3% battery lost over a 6 hour 45 mins period
A 5% wake lock causes 3% battery lost over a 6 hour 45 mins period
A 14% wake lock causes 5% battery lost over a 6 hour 10 mins period.
I'm giving this issue a rest. Lost interest in further investigating.
In the mean time I'll continue using greenify to freeze fb. It's the highest wake lock contributor.
I dont know much, but from my findings and opinion, Greenify does help me in terms of saving more juice (Battery) during screen off time, as like Facebook/Twitter/Instagram. As those types of social apps (or something like it) introduces wakelocks during Deep Sleep as they uses Google Cloud Messaging (Push Notifications) in which, involve in many wakelocks. In my usage, i never care about any notification from those apps, im more to Messaging apps guy, so i would just Hibernate them.
About system wakelock, that doesnt contribute to this issue unless you're using Greenify to hibernate them then we can talk. If you just hibernate some user apps you downloaded from PlayStore, thats totally different story.
In your case, maybe your facebook or any social apps doesnt have much notification to create big wakelocks. But you mentioned FB still produce wakelocks even after Greenify?