David
(this is weird its like having a conversation with myself)
OK - here goes ....
same machine / spec as before ...
I must say that the linux box kicks some serious ass
Sun box ..
time java TestDatePerf 1 1000000 real 2m29.685s user 1m50.051s sys 0m0.343s
time java TestDatePerf 2 1000000 real 3m18.918s user 2m43.431s sys 0m45.973s
time java TestDatePerf 3 1000000 real 4m4.658s user 2m59.931s sys 1m21.882s
time java TestDatePerf 4 1000000 real 4m38.220s user 3m4.771s sys 1m38.683s
time java TestDatePerf 5 1000000 real 4m35.668s user 3m11.771s sys 1m58.093s
time java TestDatePerf 6 1000000 real 5m6.130s user 3m21.621s sys 2m16.882s
time java TestDatePerf 7 1000000 real 4m41.621s user 3m26.351s sys 2m22.363s
Linux box
time java TestDatePerf 1 1000000 real 0m22.093s user 0m21.640s sys 0m0.120s
time java TestDatePerf 2 1000000 real 0m59.431s user 1m0.020s sys 0m26.020s
time java TestDatePerf 3 1000000 real 1m23.931s user 1m11.000s sys 0m43.220s
time java TestDatePerf 4 1000000 real 1m27.331s user 1m11.820s sys 0m43.930s
time java TestDatePerf 5 1000000 real 1m29.111s user 1m8.940s sys 0m44.740s
time java TestDatePerf 6 1000000 real 1m27.971s user 1m10.200s sys 0m45.620s
time java TestDatePerf 7 1000000 real 1m30.532s user 1m10.340s sys 0m45.370s
time java TestDatePerf 8 1000000 real 1m30.701s user 1m11.080s sys 0m44.770s
time java TestDatePerf 9 1000000 real 1m29.651s user 1m13.360s sys 0m45.050s
time java TestDatePerf 10 1000000 real 1m29.771s user 1m13.640s sys 0m43.940s
"David Rees"
<[EMAIL PROTECTED] To: [EMAIL PROTECTED]
.com> cc:
Subject: Re: java Date related classes
synchronization bottlenecks
11/07/2003 16:34
Please respond to
"Tomcat
Developers List"
David Cassidy said:
>
> I've done some tests with the below code
> hope this helps
David,
Could you give this version a try, and run it for 1 million iterations
instead of just 10k? I'll be posting my results shortly for a couple of
different machines shortly. The new version keeps the theoretical overall
run time constant by keeping the overall amount of work the same while you
vary the thread count.
So if you supply arguments 1 and 1 million, and then 2 and 1 million, in
the first case 1 thread will go through 1 million iterations, in the
second case each of the two threads will only go throgh 500,000
iterations. Saves you division. ;-)
Glenn, it would be interesting for you to modify the code to remove the
synchronization issue and then re-run the quick benchmark.
-Dave
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