1brc-cobol

A simple solution for Gunnar Morling's One Billion Row Challenge written in COBOL.

Quick start

Prerequisites:

• GnuCOBOL cobc
• Any C-compiler e.g., gcc
• Optionally make, command to compile is simple.

100 measurements are available in a file in data/measurements.txt which you can use for testing. For the full (~13 GB) file see procedures on how to generate it at the 1BRC repo.

Simply compile with make

make

or run this command

cobc -Wno-others -O3 -x c_wrapper.c 1brc.cbl -o 1brc-cobol

And to run with the data set of your choosing

./1brc-cobol measurements.txt

Performance

Test system:

CPU	16c/32t AMD Ryzen 9 7950X
RAM	64GB DDR5 @ 6000 MHz
SSD	Samsung 990 Pro NVMe 2TB

Running with the full 1 billion row file on my machine the results are as follows

real    18m 59.010s
user    18m 57.122s
sys      0m  1.880s

For comparison the baseline Java implementation runs in

real    1m 30.335s
user    1m 28.930s
sys     0m  2.482s

Meaning my implementation runs about 12.6 times slower than the baseline 😅