Question about performance/getResourceAsStream()

[jakewharton]

Question about performance/getResourceAsStream()

[dlew]

Interesting!

a) I've never conducted any performance tests but it'd be interesting to compare loading via the resource system vs. the classloader, especially since the commit you linked is directly related to that.

b) I wonder if this would mean the library wouldn't have to include the tzdata by having a custom TzdbZoneRulesProvider that calls setUseCaches(false).

The performance hit might be reason enough not to use it, if it means that you're adding a couple hundred milliseconds during initialization.

[JakeWharton]

I did a few benchmarks the weekend before last and got around 1-2ms of loading time. I did not bother comparing with the jar resources version due to Dan's blog post and approach on the Joda variant.

As to performance in general, I think I might be more interested in compiling our own TZDB format which allows us to lazy-load individual pieces from it as they're used. I haven't looked into much, just wanted to get this library up and start experimenting.

[AndroidDeveloperLB]

I did some comparison a few days ago, of the most simple way for Joda vs ThreeTen vs ThreeTenABP :

Each is a different app, of course. Tested on Pixel 2 with Android P, so currently there isn't any newer version of Android, and it's quite a good device too...

What I did is to init the library (if needed) , and get the current time, twice. I measured the time of each of those things.

I don't know about memory usage, but it seems that Joda and ThreeTenABP have better speed of first usage than the normal ThreeTen library.

When using the Android framework, though, it takes ~33ms for first call (of "LocalDateTime.now()") to finish. So if your app has minSdk of at least 26, you should consider using the Android framework instead. But even then, I think it has a disadvantage as time zones aren't updated, right? So I guess there is still need of using a library (made request here) ... :(

Can anyone else verify the results ?

Attached here sample projects for each of those.

allTests.zip