Author Archives: Roger Lacroix

My name is Roger Lacroix and I am a die hard programmer. I have been programming since the 80s. My favorite programming languages are Java, C and Rexx. I have worked in the airline, retail but I have spent most of my time doing middleware work in the financial services industry. In 1994, I was introduced to IBM MQ (aka WebSphere MQ & MQSeries) and I thought it was the next best thing since man created fire. This blog will be about IBM MQ, Java, C, Rexx and any other interesting items that I can think of. I hope you enjoy it.

JMS and Java Client Mode Performance Issues for MQ Get API Calls

August 15, 2019 Roger Lacroix
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I’ve wasted far, far too much of my time inspecting what is going on with the auto-resizing of the get buffer for the internal JMQI and MQI components for MQ classes for JMS, MQ classes for Java and MQ classes for .NET. A strange entry in one of the MQ Auditor audit files got my […]

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.NET Performance Issues for MQ Get API Calls

August 14, 2019 Roger Lacroix
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If you have read any of the following blog posting then you will know that I have a bee in my bonnet about the performance regarding Java/JMS MQGet API calls: Tuning JMS Programs for Optimum MQ Get API Calls Performance Tuning Java Programs for Optimum MQ Get API Calls Performance How to Improve Your Java/JMS […]

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Pub/Sub Java/JMS MQ MQGet API Issue

August 9, 2019 Roger Lacroix
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Not surprisingly, when I tested: Subscribing to a topic with JMS Subscribing to a topic with Java (non-JMS) They both showed that the internal JMQI routine was starting with a MQGet buffer size of 4KB and auto-adjusting the size of the buffer as needed (all behind the scenes). Hence, when I used MQ Auditor, I […]

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Red Hat Enterprise Linux 7.7 Released

August 8, 2019 Roger Lacroix
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Red Hat has just announced the final Red Hat Enterprise Linux 7 version has been released. Red Hat Enterprise Linux 7.7: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html-single/7.7_release_notes/ Red Hat Enterprise Linux (RHEL) is a Linux distribution developed by Red Hat and targeted toward the commercial market. Red Hat Enterprise Linux is released in server versions for x86, x86-64, Itanium, PowerPC […]

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How to Improve Your Java/JMS MQ Tuning Cred.

August 8, 2019 Roger Lacroix
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Here’s my version of a cheap Info-Commercial: Do you want to impress your colleagues? Do you want to impress your boss, so that you can receive a big fat bonus? Call today and we’ll show you how to impress the MQAdmins in your company! And if you call within the next 5 minutes, we’ll even […]

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NBR: Hiding In Plain Sight: Embedded Device Security

August 8, 2019 Roger Lacroix
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Here’s an NBR (Nightly Business Report) segment on embedded device security. They explained embedded device security issues so that the average user will understand it. Everyone should watch this 4 minute segment: Regards, Roger Lacroix Capitalware Inc.

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Tuning Java Programs for Optimum MQ Get API Calls Performance

August 6, 2019 Roger Lacroix
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You should really read this blog posting first. The results of some of the test scenarios below, simply do not make any sense. I would like to think there is some sort of logic behind it but it is probably lack of testing by IBM that introduced some bugs in the code or should I […]

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Tuning JMS Programs for Optimum MQ Get API Calls Performance

August 2, 2019 Roger Lacroix
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On Wednesday, I decided to do some testing of some simple (1) MQ for JMS, (2) MQ for Java and (3) procedure language (i.e. amqsbcg) programs to show that using the JVM environment variable of com.ibm.mq.jmqi.defaultMaxMsgSize with an appropriate size could make a JMS application 10 to 15% faster because there would not be any […]

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IBM MQ Fix Pack 9.1.0.3 Released

August 1, 2019 Roger Lacroix
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IBM has just released Fix Pack 9.1.0.3 for IBM MQ V9.1 LTS: https://www.ibm.com/support/docview.wss?uid=ibm10961534 Regards, Roger Lacroix Capitalware Inc.

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MQ JMS Double Get API Calls

July 25, 2019 Roger Lacroix
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Tuning applications is always a good thing. 🙂 Colin Paice has reminded me of the MQ JMS default value for an MQGET buffer size is 4KB in his blog posting here. IBM’s default value of 4KB is far too low to be useful. Having such a low value causes excessive number of MQ JMS Get […]

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