22. 07. 2019.

Oracle database benchmarking by using CALIBRATE_IO

CALIBRATE_IO is yet another popular database simulation/stress test utility, mainly used to perform IO benchmarks.   Procedure, that is part of DBMS_RESOURCE_MANAGER package, will generate read-only workload made up of 1 MB of random of I/Os to the database to determine the maximum number of IOPS and MB per second. You can save the following […]

17. 07. 2019.

Implement High Performance Computing tools to test cluster stability

There are many benchmark testing tools that are focusing on various fields of a cluster like computing capabilities, energy efficiency, data & storage, memory etc. In this article I’m going to use Somberero – High Performance Computing tool suitable to run a test against your home PC or cluster of supercomputers. Sombrero is particularly useful […]

07. 07. 2019.

bash history search on steroids

Today there are several hundreds (maybe even thousands) programming languages around (not to mention Domain Specific languages), but bash, with all its shortcoming, is still native language of all *nix servers around. With today’s choices you might not want to create scripts in bash, for one liners bash is still in. In this article I […]

22. 05. 2019.

Troubleshooting boot issues in Linux – part 2

This article is an extension of the following one:   https://www.josip-pojatina.com/en/troubleshooting-boot-issues-in-linux/   where I’ve added part that describes situation when you cannot boot your system at all, but Linux distro image DVD is still not required.   To be able to troubleshoot further what is going on, you need to start your Linux server machine. […]

07. 05. 2019.

Troubleshooting boot issues in Linux

After I’ve installed one older application on Oracle Linux 7, next time I’ve tried to start it, the server refused to start. Fortunately it’s Linux, so there are many ways to recover it. The following approach should work for most cases. Try to boot into the terminal mode by editing Grub In case that previous […]

23. 03. 2019.

How to install CUDA Toolkit on Ubuntu 18.04 LTS

This is the second part of CUDA-GPU tuning series where I’ll explain how to install CUDA Toolkit 10.1 on Ubuntu 18.04 LTS. In the first part I’ve described how to properly install nVidia drivers on Ubuntu 18.04 LTS Detailed instructions can be found on any of these two pages: https://www.josip-pojatina.com/en/how-to-install-nvidia-driver-on-ubuntu-18-04-lts/ or https://www.performatune.com/en/how-to-install-nvidia-driver-on-ubuntu-18-04-lts/   Although you […]

22. 03. 2019.

How to install nvidia driver on Ubuntu 18.04 LTS

CUDA, OpenCL and GPU programming in general are hot topic in today’s IT world. Main reason for that is a rise of Data Science, Artificial Intelligence and Deep Science, and many new technologies that relies on it like self driving cars, robotics etc. Traditionally main consumers of graphical cards are: gaming industry video editing professionals […]

29. 01. 2019.

Putty for Linux copy/paste issue and solution

Putty is probably the most common tool to access Unix/Linux environments on Windows platform by using ssh protocol. Recently I’ve been in situation where I’ve got only Putty generated ppk file to access Unix server. Although I’ve asked if I can get open ssh generated file, that was not possible, as it was assumed that […]

28. 01. 2019.

Easy way to create Virtualbox VM’s internal network

Virtualbox is a very popular hypervisor which allows you to run guest virtual machines like Windows, Linux, BSD, Solaris etc. For various purposes you might want to combine several virtual machines into one network. In this post I’ll describe the easiest way of how to do that, which is good enough for most of the […]

24. 01. 2019.

Installing SQL Developer on Ubuntu

Today it is not necessary to introduce SQL Developer, Oracle’s main tool to work with databases. I’ve started to use SQL Developer from the beginning (2015, project Raptor, later renamed into SQL Developer). Before that, the only Oracle tool for working with it’s flagship database was SQL*Plus (and iSQL*Plus later). For that reason, most of […]