Re: DataQueue performance jt400Native 10x slower then RPG

same bad performance. it seems even a littlebit slower mor in the range of
200ms fpr 1024msgs



From: "Colin Williams" <colinwilliams007@xxxxxxxxx>
To: "Java Programming on and around the IBM i"
<java400-l@xxxxxxxxxxxxxxxxxx>
Date: 10.04.2020 18:24
Subject: Re: DataQueue performance jt400Native 10x slower then RPG
Sent by: "JAVA400-L" <java400-l-bounces@xxxxxxxxxxxxxxxxxx>



What about if you call your class outside of pase?

On Fri, 10 Apr 2020, 17:10 , <Franz.Rauscher@xxxxxxxxxxx> wrote:

i verified this.

when i reduce the message size, the performance difference gets even

worst.

it seems that the api calls from pase are very slow




(mobil)



Ursprüngliche Nachricht


Von: colinwilliams007@xxxxxxxxx
Gesendet: 10. April 2020 17:42
An: java400-l@xxxxxxxxxxxxxxxxxx
Antworten: java400-l@xxxxxxxxxxxxxxxxxx
Betreff: Re: DataQueue performance jt400Native 10x slower then RPG


Have you eliminated jvm startup time from that?

Before you start writing the messages to the dataqueue output a log

message

and after you finish output a log message to confirm you are eliminating
the overhead of jvm startup.



On Fri, 10 Apr 2020, 16:35 , <Franz.Rauscher@xxxxxxxxxxx> wrote:

Hi!

I have a performance problem with my IBM-i scenario.

I have a RPG Client which writes messages to a dataquene. the messages

are

about 9000bytes in size. i am writing 1024 messages.

I have two server implementaions which run on the same IBMi machine

one

in

Java and one in RPG

The java version takes about 150ms to read 1024 messges. The RPG

version

only about 15ms. so the RPG version is 10 times faster.

I verified that i user jt400Native and the AS400ImplNative and
BaseDataQueueImplNative is used so that the native API calls from

JVM/Pase

are used.

Both server implementations are running in al loop so that i can

exlude

any startup perfomance impacts. The timings do not vary over time. RPG

is

alwas 10x faster.


Why is the Java/Pase version so much slower??

Greetings,
Franz

My Environment is: Power S812 64GB RAM (1Core no VIOS). IBM-i 7.4 TR1.
There is no load on Server


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