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Some Sample Performance Numbers
To illustrate some of our ideas, here is a table listing the approximate
run times for a few basic actions. Note that these values should NOT be taken
as absolute numbers: they are a combination of CPU and wall clock time, and
will change as improvements are made to the system. However, it is worth
noting how these values apply relative to each other — for example,
adding a member variable currently takes about four times as long as adding a
local variable.
| Action |
Time |
| Add a local variable |
1 |
| Add a member variable |
4 |
| Call String.length() |
5 |
| Call empty static native method |
5 |
| Call empty static method |
12 |
| Call empty virtual method |
12.5 |
| Call empty interface method |
15 |
| Call Iterator:next() on a HashMap |
165 |
| Call put() on a HashMap |
600 |
| Inflate 1 View from XML |
22,000 |
| Inflate 1 LinearLayout containing 1 TextView |
25,000 |
| Inflate 1 LinearLayout containing 6 View objects |
100,000 |
| Inflate 1 LinearLayout containing 6 TextView objects |
135,000 |
| Launch an empty activity |
3,000,000 |
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