Performance Boundaries

Cache Decision

Reuse or Rebuild

A cache boundary chooses between reusing known work and rebuilding fresh output. Modeling the decision keeps the cost tradeoff visible.

Program

Play the script to choose the cache state and see the planned action.

cache_decision_plan.sh 
#!/usr/bin/env bash

cache_hit=
if [[ "$cache_hit" -eq 1 ]]; then
    action="reuse"
    cost=1
else
    action="rebuild"
    cost=5
fi
echo "$action cost=$cost"

#!/usr/bin/env bash

cache_hit=
if [[ "$cache_hit" -eq 1 ]]; then
    action="reuse"
    cost=1
else
    action="rebuild"
    cost=5
fi
echo "$action cost=$cost"
cache hit A cache hit means previous work can be reused.
cost model A small cost model makes the tradeoff visible without benchmarking.
rebuild path The rebuild path is more expensive but refreshes the output.