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Harsha Jayamanna

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Factors affecting the Java Benchmarking.

Benchmarking compiler Java jvm

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A Software Engineer with more than 5 years of Experience.
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Email: harsha.kj89[at]gmail[dot]com

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Factors affecting the Java Benchmarking.

In computing, a benchmark is an act of running a computer program, a set of programs, or other operations, in order to assess the relative performance of an object, normally by running a number of standard tests and trials against it. Benchmarking in java can be boiled down to measuring how long some operation takes. To measure and find which approach is better, we can write a small benchmark program, often called a Microbenchmark.
Evaluating performance and obtaining metrics of codes in applications, frameworks and tools are essential for developers. but to do that properly, we need to have an understanding of how the JVM actually executes Java bytecodes including dynamic compilation and optimization. According to Brian Goetz, Without understanding the dynamic compilation process, it's almost impossible to correctly write or interpret performance tests for Java classes. Even with that knowledge, it is still difficult to write a proper benchmark program.
Dynamic compilation and o…

What changed in licensing after Java 11?

Simply,

Oracle’s JDK (commercial) – you can use this in development and testing for free, but if you use it in production you have to pay for it
Oracle’s OpenJDK (open source) – you can use this for free in any environment, like any open source library
That's it. You don't need to know anything else.

Anyway I have more to discuss here.

Starting with Java 11, Oracle will provide JDK releases under the open source GNU General Public License v2, with the Classpath Exception (GPLv2+CPE), and this is the Open JDK. From Java 11 this will be identical to the Oracle JDK with the exception of few cosmetic and packaging differences. Those exceptions are:

-XX:+UnlockCommercialFeatures option not available in open jdk
Open JDk can not provide usage log data to the “Advanced Management Console” tool.
The output of the java --version and java -fullversion is different.
OpenJDK cryptography framework allows either a valid signature or unsigned third party crypto provider.
Oracle OpenJDK builds are…

A Study on Linux Kernel

Kernel is the central or most important part of something. Linux Kernel plays a role which is similar to that. Linux Kernel is the core or the most impotent part of an operating system. Some of the operating systems which have the Linux Kernel as the core are GNU/Linux, Ubuntu Linux, Linux Mint, Arch Linux, Deepin, Fedora, Debian and openSUSE.
Figure 00: Few Linux Distributions
The kernel is the part which loads first when the operating system starts and remains in the protected area of the main memory. Kernel is the hardware abstraction layer. It enables the application layer to connect with the hardware layer and vice versa. Kernel is in charge of memory management, process management, task management, and disk management.

Figure 01: Roll of the Kernel

History In 1960 MIT, Bell Labs, and General Electric Developed an operating system called Multics(Multiplexed Information and Computing Service) for the GE-645 mainframe computers. Multics not only brought many new innovations but also …

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