This article presents a few informal benchmarks comparing the Raspberry Pi to the Raspberry Pi 2. The original Pi has a single core ARM v6 processor. The Pi 2 is quad core, ARM v7, and clocked faster than the Pi 1. But is it really six times as fast, as the makers claim ? Short answer: yes it is. And then some. Continue reading
Here is a tip for speeding up WordPress, especially if you are running it on a low power server. I made the change to WordPress running on a small ARM server, resulting in an immediate and dramatic speed up. It works because it prevents bots on the Internet from wasting your server resources. Continue reading
A handy feature of regular expressions is their ability to “or” match. Searching for two strings in a file is easy with a construct like “egrep ‘root|uucp’ /etc/passwd”. The vertical bar (“|”) acts as an “or” operator. Perl supports the vertical bar too, and the same match could be achieved in Perl thus:
bash-4.2$ perl -n -e 'print $_ if /root|uucp/' < /etc/passwd
root:x:0:0:root:/root:/bin/bash
uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
Weirdly though, this construction is up to 10 times slower than 2 separate matches performing the same search, as can be shown with a quick demonstration. Continue reading