Re: Speed question?

["Dave Wall" <dawall@xxxxxxxxxx>]

I see you talk about file.open() which makes me think you are using
record-level access instead of JDBC.  As with the other Toolbox objects,
the time to connect RLA is significant.  In fact, if the program model is
connect, open file, read data, close file, close connection, loop, the
connection time will be as long or longer than file open / read data.  Your
file.open() call may be the first method call that requires server access
so it connects, making the open call slow even though much of the time
should be blamed on connection logic.

If any of this is true then you can try optimizing connection logic.  You
say you are using swing.  If you have enough info (server name, uid/pwd)
ahead of time one change could be to connect in a background thread while
swing is painting the gui.  Then the connection step is done by the time
you need data on the user's thread.  A connection pool is also a
possibility.  Toolbox added a connection pool class in v5r1.  Your first op
may be slower because a connect is needed, but future requests will be
faster because a connection already exists.

The same discussion applies if you decide to switch to ProgramCall.
Connection time will be significant so reuse connections whenever possible.
It also applies to JDBC.

David Wall
AS/400 Toolbox for Java




                      "Robert Upshall"
                      <rupshall@psasoft        To:       
<java400-l@midrange.com>
                      .com>                    cc:
                      Sent by:                 Subject:  Speed question?
                      java400-l-admin@m
                      idrange.com


                      01/16/2002 09:08
                      AM
                      Please respond to
                      java400-l





Hi,

I have a question.  I have a swing application that uses JTOpen classes to
access DB2 files and to make pgm calls.  My problem/concern is file access
is so much slower that a pgm call, i.e. if I open a DB2 file in java and
read a  record it takes noticeably longer than if I was to call a RPG pgm
to
read the same record and return the record as parameters.  The file.open()
method appears to be the place I get the biggest speed hit.  Is there any
tweaking that I can do client and/or server side to speed this access?

Anybody have any suggestions?

Robert Upshall
Professional Software of Amarillo
(806) 358-8928
rupshall@psasoft.com


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