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midrange.com
>* What is the resource usage of Java programs
>under OS/400? How can I tell for myself? It is
>very important that we can determine accurately if this is a feasible
path.
>
I'd be careful on that one. Give it a go and do a profile / load test to
see if AS400's a suitable path - if it meets your requirements fine, else
compare the same tests to other platforms to see if there's something
specific to AS400 implementations that's causing an issue. If you can't
test because you havn't written it yet, do you really want to lock yourself
down 1 route ?
> I've never found Java applications to be resource-intensive on OS/400.
> Of course a badly written application could cause problems.
Generally I'd agree. I've only seen 1 instance where there was a big
difference - even with recommended upgrades (v. expensive ones!! to an
already top of the range AS400), the AS400 still couldn't touch an 5k
(euro) dual xeon running Tomcat / WS. Eventual recommendation was we stay
with Xeon for app server level software because IBM couldn't fully fix an
AS400 / Java specific implementation issue.
Pete.
tballen@xxxxxxxxx
m
Sent by: To
java400-l-bounces Java Programming on and around the
@midrange.com iSeries / AS400
<java400-l@xxxxxxxxxxxx>, Java
Programming on and around the 20/09/2005
05:22 iSeries / AS400
<java400-l@xxxxxxxxxxxx>
cc Please respond to
Java Programming
Subject on and around the Re:
Switching to Java on OS/400 - iSeries / AS400 got a
few questions. <java400-l@midran
ge.com>
I'll attempt to answer a few questions.
I'm not familiar with the long startup time of Tomcat.
You can create native Java program objects on
OS/400 with the CRTJVAPGM command.
Change the optimization level. It is *INTERPRET by default.
You can run graphical applications using NAWT on OS/400 but it is not easy.
Below are some notes I have on this. We never
tried it but it may give you a place to start.
NAWT relies upon the X Window System for its
graphics engine. The recommended X Window
graphics server for this release is Virtual
Network Computing (VNC), which runs under OS/400
Portable Application Solutions Environment
(PASE). PASE is a UNIX-like environment capable
of running most binary executables compiled for
IBM's AIX operating system. VNC is a product of
AT&T Research Labs, and provides a virtual X
Window server; that is, an X server that does not
require a directly attached graphics-capable display device.
I've never heard of anyone using OS/400 as a development platform.
I've never found Java applications to be resource-intensive on OS/400.
Of course a badly written application could cause problems.
I am familiar with 2 JDBC drivers for DB2/400:
1) com.ibm.db2.jdbc.app.DB2Driver -> Use this
when running a Java application locally on an iSeries (AS/400) machine
2) com.ibm.as400.access.AS400JDBCDriver -> Use
this driver when accessing a remote iSeries (AS/400) system
I hope this helps.
Todd
At 02:02 PM 9/19/2005, Thorbjørn Ravn Andersen wrote:
>I am an experienced Javaprogrammer with
>Windows+Unix experience who have now for a while
>worked with creating frontends for OS/400
>backbone calls using Eclipse on Win32.
>
>Just for fun I tried installing and running
>Tomcat 5.0.30 beta the other day, with the
>intent of eventually porting our webapps to run
>natively on OS/400, but we are very careful since that is very new to us
all.
>The sample JSP's and servlets was impressively quick!
>
>I would therefore like to hear if there is
>experience in this forum regarding the following:
>
>* The long startup time of Tomcat (50 seconds)
>is due to some precompilation to native code?
>* Can I use graphical applications (Swing) on
>OS/400 and use some software on Win32/Unix to
>see the output. X Windows perhaps?
>
>* I have seen that some corners of eclipse.org
>mention OS/400 binaries, but not for the native
>Eclipse application. Is this available, or is
>it perhaps some Websphere package? How do I
>access that (i.e. what am I to ask the system
>responsible) :) Would Netbeans run?
>
>* Do anyone use Java on OS/400 as a development
>platform, or is it solely for deploying applications?
>
>* I found the qsh interface rather sluggish to
>work with. Can I ssh to OS/400 instead and
>perhaps get a more responsive shell?
>
>* What is the resource usage of Java programs
>under OS/400? How can I tell for myself? It is
>very important that we can determine accurately if this is a feasible
path.
>
>* Do anyone have performance numbers of
>JDBC-access using the best driver when running
>on OS/400? We may have a very data processing
>intensive application where network performance
>may be a bottleneck if running on another host.
>
>
>
>Any other suggestions, including further reading, would be appreciated.
>
>Thanks in advance for any pointers.
>
>Best regards,
>
> Thorbjørn Ravn Andersen
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