Programming on /dev/urandom's dev site

cuda debugging notes

Wed, 19 May 2021 00:00:00 +0000

So, turns out, when you run a program that uses CUDA, either directly or indirectly (my program runs on CUDA, but uses OpenCL instead), there are issues preventing libasan from working. More specifically, if you run a program with libasan, the CUDA libraries will not work, and the OpenCL ones will not display an NVIDIA platform as available in the first place.

From my experience, seems like there are similar issues preventing Valgrind from working, either.

note on cpan

Tue, 23 Mar 2021 00:00:00 +0000

Note to self: if your distro’s repositories don’t have a Perl package, it’s best to install them from CPAN instead. A tool called cpan minus (In Alpine, its packaged as perl-app-cpanminus) can do it easily, either installing packages into one’s home directory or globally.

trying to do assembly-level debugging in gdb

Mon, 02 Nov 2020 00:00:00 +0000

GDB seems to have been clearly made with source-level debugging in mind, the kind where the source code of the program is available. Sometimes this is not the case, or you just don’t want to bother looking for the source code. Here I’ll put a bunch of useful commands.

assorted shell scripts

Sun, 31 May 2020 00:00:00 +0000

shell scripts:

grab lines from dictionary, convert them into up-to-16-byte strings, do a binary dump

for x in `cat input_words.txt`; do echo $x | tr -d \\n | dd ibs=16 conv=sync 2>/dev/null | xxd; done

convert a .vgz directory to a .vgm one, along with updating all the playlists:

rename ".vgz" ".vgm.gz" *.vgz; gzip -d *.vgm.gz; sed -i "s/\.vgz/\.vgm/" *.m3u

(requires rename from util-linux and not from perl)

profiling utility hints

Sun, 31 May 2020 00:00:00 +0000

Some small hints for profiling utilities used on Linux systems.

shell parameter expansion

Sun, 31 May 2020 00:00:00 +0000

This is a small cheat sheet to remind me of how parameter expansion works in unix shells.