Am 22.05.2009 01:41, Ulf Zibis schrieb:
Am 21.05.2009 00:22, Xueming Shen schrieb:
Ulf Zibis wrote:
(7) Avoid copying b2cStr to b2c:
(String#charAt() is fast as char[] access)
Benefit[7]: increase startup performance for decoder
I tried again last night. char[][] is much faster than the String[]
version in both client
and server vm. So keep it asis. (this was actually I switched from
String[] to char[][])
I'm surprised, because I had in mind from older benchmarks, that
char_array[index] had same speed than str.charAt(index) after
optimization from hotspot.
I also had this results here:
https://java-nio-charset-enhanced.dev.java.net/source/browse/java-nio-charset-enhanced/branches/array_io_string/src/sun/nio/cs/SingleByteFastDecoder.java?rev=&view=markup
Maybe hotspot doesn't optimize here, because initC2B() only runs once,
but later in de/encoder loops .... wouldn't str.charAt(index) be
optimized by hotspot to same speed?
-Ulf
