Informatics

FIFO profit’s stock sell calculation with LibreOffice Calc

The generalisation of spreadsheets use nowadays sometimes hides the fact that these tools aren’t good enough for every imaginable data manipulation. Sometimes people tweak and twist cells in order to achieve results that are simply beyond the possibilities of a spreadsheet application, no matter how powerful. For these occasions, R is probably more suitable. Anyway, … Continue reading

Informatics

monitoring php-fpm threads with cacti (via snmp)

PHP-FPM is a technology integrated in PHP since v5.4.0RC2. Its most outstanding feature is its ability to start workers with different uid/gid/chroot/environment. This allows for example for the separation in filesystem (chroot) and processes of different VirtualHosts — as long as they use php. If implemented this way, one can end with multiple separated php-fpm environments, … Continue reading

Informatics

statistics circle for analysing byte entropy in files

In a previous post I introduced triops, a multiplatform cmdline encryption tool using CHACHA20 algorithm. In general, any encryption algorithm should produce a reasonably high entropic output no matter the input (plain text) at hand — this is in order to be aligned with concepts like Entropic security and Semantic security, very important in modern … Continue reading