Re: JAVA中测时间的方法？# Java - 爪哇娇娃
y*h
1 楼
For reference only,
copied from Java Developer Connection Forum, written by
knoxos:
For reference only,
copied from Java Developer Connection Forum, written by
knoxos:
d*x
2 楼
The best I could do was using JNI to invoke the Solaris high resolution
timer. That gave me a resolution of around 30us(the cost mostly being
the JNI overhead and Solaris System call overhead).
On i386 platforms, you can directly get hardware clock from a register.
This register exists on Pentium+ machines, it records every tick of the
CPU. So for a 1GHz box, that is a nanosec resolution timer(well, not
exactly, there will be some overhead in reading the register). This wouldn't
help in Java tho
timer. That gave me a resolution of around 30us(the cost mostly being
the JNI overhead and Solaris System call overhead).
On i386 platforms, you can directly get hardware clock from a register.
This register exists on Pentium+ machines, it records every tick of the
CPU. So for a 1GHz box, that is a nanosec resolution timer(well, not
exactly, there will be some overhead in reading the register). This wouldn't
help in Java tho
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