Re: Optimizing Native Java

[Bruce Jin <brucej@xxxxxxxxxxxxxxxxxxxx>]

As an example turn on log4j debug on an application based on third party 
code (String framework) yields these detailed logs and you can see 
precisely where the time goes 

09:37:55,750  INFO I00100a:25 - =====> I00100 starts...
09:37:55,859  INFO SqlBuilderFactory:66 - Created sql builder 
AS400/iSeries sql builder
09:37:56,250 DEBUG JdbcTemplate:299 - Executing SQL query [SELECT 
T01."EMP#",T01."LASTNAME",T01."FIRSTNAME",T01."ACTIVE",T02."DATE",T02."INCTYPE",T02."EMPSPRVR",T02."SHIFT",T02."COWORKER",T02."INFO"  
FROM MRCJAVALIB."EMPLOYEE" T01  left outer join MRCJAVALIB."INCIDENT" 
T02 ON T01."EMP#"=T02."EMP#"    ORDER BY T01.EMP# ASC fetch first 11 
rows only]
09:37:56,250 DEBUG DataSourceUtils:106 - Fetching JDBC Connection from 
DataSource
09:37:57,437 DEBUG DataSourceUtils:272 - Returning JDBC Connection to 
DataSource
09:37:57,468 DEBUG JdbcTemplate:299 - Executing SQL query [SELECT 
COUNT(*)  FROM
09:37:58,625  INFO MrcLastRun:110 - Updated mrc dct with sql=UPDATE 
MRCJAVALIB.MRCDCT14 SET DATLST=101706,TIMESR=28 WHERE RETRN=100
09:37:58,640  INFO I00100a:137 -   -----> I00100 ends.

regards

> > If you and/or your third party software use a log facility (I think most 
> >     
> software do) such as log4j you can turn on debug mode and inspect the 
> log’s timestamp and see where the time goes
>
> Easier said than done, especially for big systems. Also, as a rule, requires
> some instrumentation to be included in the application being tested.
> Otherwise, only servlet/enterprise bean-level information would be available
> - personally, I find that insufficient. In any case, I certainly did not
> mean that type of 3rd party software.
>
> Lo 
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> -----Original Message-----
> From: Bruce Jin [mailto:brucej@xxxxxxxxxxxxxxxxxxxx]
> Sent: 17 October 2006 14:39
> To: Java Programming on and around the iSeries / AS400
> Subject: Re: Optimizing Native Java
>
>
> If you and/or your third party software use a log facility (I think most 
> software do) such as log4j you can turn on debug mode and inspect the 
> log’s timestamp and see where the time goes
>
> regards.
>
> Raikov, Leonid wrote:
>   
> > The most important thing is to understand where the time goes. Situations
> > when there are no bottlenecks and every class contributes to poor
> > performance in equal measure are pretty rare. What you need is to a)
> > understand what threads are primarily involved in productive work and then
> > b) draw a chart describing what each of these thereads is busy doing (e.g.
> > 50% of the time spent waiting for JDBC queries and 50% of the time doing
> >     
> XML
>   
> > processing). You can hardly achieve this without Java performance analysis
> > tools for System i. IBM Job Watcher is what immediately springs to mind,
> >     
> but
>   
> > JW data is not easy to analyse, to say the least. There are other tools,
> > some of them pretty good, but none of them in the Open Source domain, as
> >     
> far
>   
> > as I know.  
> >
> > As for the magic button, there is none, I'm afraid. I would be suprised if
> > memory alone could make you happy. That is, unless you're running your JVM
> > in a 50MB pool.  
> >
> > Lo
> > -----Original Message-----
> > From: albartell
> > To: 'Java Programming on and around the iSeries / AS400'
> > Sent: 10/16/06 4:12 PM
> > Subject: Optimizing Native Java
> >
> > Hi All,
> >  
> > I am just completing a project where I wrote a Java proxy of sorts and
> > there
> > were a bunch of third party jar files involved in the mix. To make a
> > long
> > story short we are not satisfied with the performance we are getting out
> > of
> > the Java processes on the iSeries (note the Java is running in it's own
> > job
> > listening to a data queue - only one JVM startup).  We have run the
> > CRTJVAPGM against all .class and .jar files involved and are wondering
> > are
> > there any other mechanisms to look at concerning getting more speed on
> > the
> > Java end?
> >  
> > Obviously one solution would be to throw more memory at it, but is there
> > a
> > way to section off the memory so this Java process gets sole use of it
> > (similar to how you can do the same for Websphere Application Server)?
> >  
> > Any other idea's?
> >  
> > Aaron Bartell
> > New Tool! - RPG Chart Engine - visit www.mowyourlawn.com
> > <http://www.mowyourlawn.com/>  for more info.
> >  
> >  
> >   
> >     
>
>