Rails application not working, no error displayed, just error code 500

I was facing a strange problem. My application was working fine, but after some time it stopped to respond. It just returned error code 500. No error message on the screen, no error message in the error log, everything seemed to be fine. I found few hints on the internet – reboot, delete all sessions…… Continue reading Rails application not working, no error displayed, just error code 500

How to show performance statistics in a chart

Working on performance tests and tuning is an interesting and challenging job. One has to prepare tests, execute and also evaluate them. The preparation and execution is not always easy, but it is manageable. The evaluation of the tests comes with an interesting problem. The problem is called data visualization. I was testing a system… Continue reading How to show performance statistics in a chart