memtest tests the effect of the C memory allocator. The default version uses Calloc from the stdlib.

If the program is built using the jemalloc build tag, then the allocator used will be jemalloc.

Monitoring

To monitor the memory use of this program, the following bash snippet is useful:

while true; do
ps -C memtest -o vsz=,rss= >> memphys.csv
sleep 1
done

This is of course contingent upon the fact that the binary of this program is called memtest.