tomcat-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "David Cassidy" <david.cass...@db.com>
Subject Re: java Date related classes synchronization bottlenecks
Date Mon, 14 Jul 2003 09:40:30 GMT

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"                                                       
                                                                             
                      <dbr@greenhydrant        To:       tomcat-dev@jakarta.apache.org
                                                                                
                      .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
---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-dev-help@jakarta.apache.org




--

This e-mail may contain confidential and/or privileged information. If you are not the intended
recipient (or have received this e-mail in error) please notify the sender immediately and
destroy this e-mail. Any unauthorized copying, disclosure or distribution of the material
in this e-mail is strictly forbidden.



---------------------------------------------------------------------
To unsubscribe, e-mail: tomcat-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: tomcat-dev-help@jakarta.apache.org


Mime
View raw message