YourKit is a great Java profiling tool. It is a commercial software but you can get a free 15-day evaluation license key for a fully functional version of the profiler.
The past week I was working on a Java project and the software was very slow. Using YourKit I could easily find the bottleneck. It turned out that 94% of the time was spent in a function that I implemented in a naive way. Choosing a better algorithm the software got much faster. A profiler is really useful…
For Java I use Eclipse. YourKit integrates in Eclipse perfectly through an Eclipse plugin.
Here is an excellent post about Python profiling.
Here is how to use spaces instead of TABs in the Eclipse IDE:
- Click Window -> Preferences.
- Expand Java -> Code Style.
- Click Formatter.
- Click the Edit button.
- Click the Indentation tab.
- Under General Settings, set Tab policy to: Spaces only.
- Click OK to apply the changes.
Tip from here.
Some funny GitHub commits:
What to do if shit happened.
You want to increase the sudo password remember timeout.
sudo visudo“, then add this line to the end:
60 means 60 minutes. If you specify
-1, then the password is never forgotten (which is not a good idea IMO).
Tip from here.
The “Windows key + d” (aka “Super + d”) minimizes all windows, i.e. it shows you the desktop. It works under Windows, it works under Ubuntu, but for some mysterious reason, under Manjaro (XFCE), it’s “Ctrl + Alt + d” that I’ll never get used to.
How to use the well-known “Super + d” shortcut?
There must a keyboard shortcut editor for this, but I never find it. So I created a new shortcut that calls a command-line application that minimizes all windows. This way you get the same result. The command-line command for showing the desktop is “
wmctrl -k on“. You may have to install the package
Go to the Start menu, start typing “keyboard”, and open the Keyboard application. Go to the “Application Shortcuts” tab and add the “Super + d” shortcut to the command “
wmctrl -k on“.
On the YouTube channel of gotbletu I found a very nice trick (video). It explains how to replace the Caps Lock with the so-called Hyper key. And why? Because Caps Lock is pretty useless and you cannot use it for shortcuts. But if you tell the system that at the place of Caps Lock there is another key, namely the Hyper key, then you can use a new range of shortcuts.
You can find my
.Xmodmap file here. Just put it in your HOME folder and upon the next reboot it’ll be activated automatically. To activate it without a reboot, use the command “
Then, under Manjaro (XFCE), go to the Start menu, start typing “keyboard”, and open the Keyboard application. Go to the “Application Shortcuts” tab and add some new shortcuts. This time, when you press Caps Lock, it’ll be recognized as the Hyper key. I added these:
Hyper + g gedit Hyper + k konsole Hyper + f file browser (thunar)
And if Hyper Hyper, then Scooter, of course: