Hi Nicolas,
if I either find the test code (or you commit it) I can tell you on Mac
OS X .... :-)
Siegfried Goeschl
nicolas de loof wrote:
on java < 5 backport-util-concurrent is required to provide
System.nanotime()
I've no idea of the result of such a bench on other JVM /
architectures. I'll try it on some of my corporate servers (solaris /
linux ...)
Having two timing modes would be a solution as you proposed.
2008/2/1, Siegfried Goeschl <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>>:
Hi Nicolas,
a few thoughts
+) I use dynamic proxies together with JAMon to measure the execution
time of method invocations - ns would make a lot of sense here
+) the execution times also depend on you JVM since you are using
JRockit
+) and finally it depends how often you start/stop a monitor
+) retrotranslator will fail badly since System.nanotime() was
introduced with Java 1.5
Maybe the decision can be deferred until creating a monitor - the user
decides whether to use ms or ns?
Cheers,
Siegfried Goeschl
nicolas de loof wrote:
> Hello,
>
> For commons-monitoring my first intent was to use
System.nanotime() to
> compute code performances. A simple bench [1] demonstrates that
> System.currentTimeMillis is FAR quicker to return current time
(on my
> windows box [2]) :
>
> nanoseconds precision may be usefull for profilers, but is it
for monitoring
> purpose ?
>
>
>
> [1] 10000000 time (System.nanoTime() ) vs
(System.currentTimeMillis()) :
>
> D:\projets\apache\trunks-sandbox\monitoring\target>java -server -cp
> .\test-classes
> org.apache.commons.monitoring.bench.CurrentTimeMillisVsNanoTime
> nanotime took : 4683052742ns
> currentTimeMillis took : 26907938ns
>
> [2]
> D:\projets\apache\trunks-sandbox\monitoring\target>java -version
> java version "1.6.0"
> Java(TM) SE Runtime Environment (build 1.6.0-b105)
> BEA JRockit(R) (build
R27.2.0-131-78843-1.6.0-20070320-1457-windows-ia32,
> compiled mode)
>
>
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