This repo contains additional materials for caching problems article.
File structure:
data/ - CSV files with script built data
image_sources/ - image source files
images/ - rady to use images (schemes & visualizations)
run_cold_start.php - a script for a synthetic test of system start with an empty cache
run_modulo_resharding.php - a script for calculating the cache loss on servers count change
visualization.ipynb - Jupyter notebook with data visualizations
PHP 7.1+ is mandatory to run the scripts.
# Emulating the problem of system start with an empty cache
## Using 10K unique users in the system, getting 1K requests per second,
## looking at the system for 200 seconds, using a fixed cache lifetime
./run_cold_start.php --rps=1000 --users=10000 --time=200
## The same, but using the pseudo-random cache lifetime instead of the fixed one.
./run_cold_start.php --rps=1000 --users=10000 --time=200 --random
# The cache loss on servers count change
## Consider for the case with 100 thousand keys and for the situation with 4 and 5 servers
./run_modulo_resharding.php --keys=100000 --servers=4,5
## Consider for the case with 100 thousand keys and for the situation with 1-10 servers
./run_modulo_resharding.php --keys=10000 --servers="1-10"
