toolbox benchmark improvements

["Alex Garrison" <agarrison@xxxxxxxxxxx>]

 

We have been doing some internal benchmarks for the java toolbox on our as/400 under somewhat controlled conditions and found results I wanted to share with the group.  The test cases used record-level keyed and sequential file access modeling some of the typical processes we do in our web application. 

 

The tests were run as batch programs on our as/400 system during a period of low utilization when I had the system pretty much to myself.  The test application reads records from many different tables, parses the fields converting them to strings, and then loads the strings into vectors.  The numbers shown reflect the averages of many repetitions over a variety of tables in our database.  The actual times are not important; the differences in the times between the three test cases is very interesting.  We see up to a 41% improvement in the i/o time.  The parsing time (ie getField(), getFields()) changed little, and the vector processing was really statistically unchanged (to be expected since that is done by the java base classes, not the toolbox).

 

Three toolbox configurations were evaluated:

    1. mod2 GA release of the toolbox compiled to optimization level 30.

    2. mod2 toolbox with SF59086 service pack compiled to optimization level 30.

    3. mod2 toolbox with SF59086 service pack compiled to optimization level 40 using licopt(NOPRERESOLVEEXTREF)

 

Test CASE 1: Toolbox Mod2 GA                   

Category    time(ms)    %tot time

I/O         1586        60

Parse        683        26

Vector       363        14

 

Test CASE 2: Toolbox MOD2 SF59086 level 30

Category    time(ms)    %tot time

I/O          888        43

Parse        763        37

Vector       395        20

 

Test CASE 3 : Toolbox Mod2 SF59086 level 40

Category    time(ms)    %tot time

I/O          656        35

Parse        796        43

Vector       404        22

 

                   %difference

Category    test case 1-2   test case 2-3  test case 1-3

I/O         -28             -15            -41

Parse       +05             +02            +08

Vector      +04             +01            +04

 

 

 

Alex Garrison
agarrison@logtech.com
(423)636-7213