I've been doing some benchmarks on my machine (a dual 733 running redhat
7.2)
and there seems to be a 20 millisecond penalty for doing a sleep or a wait.
Here
is code that illustrates it:
try {
for (int i = 0; i < 30; i++) {
long start = System.currentTimeMillis();
Thread.currentThread().sleep(i);
long end = System.currentTimeMillis();
System.out.println("total time = " + (end - start) + " for
sleep(" + i + ")");
}
} catch (Exception ex) {}
The output i get is
total time = 2 for sleep(0)
total time = 21 for sleep(1)
total time = 20 for sleep(2)
total time = 16 for sleep(3)
total time = 23 for sleep(4)
total time = 19 for sleep(5)
total time = 20 for sleep(6)
total time = 19 for sleep(7)
total time = 20 for sleep(8)
total time = 20 for sleep(9)
total time = 20 for sleep(10)
total time = 29 for sleep(11)
total time = 29 for sleep(12)
total time = 29 for sleep(13)
total time = 29 for sleep(14)
total time = 29 for sleep(15)
total time = 29 for sleep(16)
total time = 26 for sleep(17)
total time = 33 for sleep(18)
total time = 29 for sleep(19)
total time = 29 for sleep(20)
total time = 39 for sleep(21)
total time = 39 for sleep(22)
total time = 39 for sleep(23)
total time = 39 for sleep(24)
total time = 40 for sleep(25)
total time = 39 for sleep(26)
total time = 39 for sleep(27)
total time = 39 for sleep(28)
total time = 39 for sleep(29)
This is pretty much consistent on all jvms that i've tried blackdown, sun
(1.3.x and 1.4) and IBM
and would seem to therefore be an OS issue. Can anyone provide me with more
info on this and is
there a workaround?
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