Heap profiling

In order to detect memory leaks or excessive memory consumption, we can use DHAT for heap profiling. This is currently set up in the cosmwasm-vm package. It was used to debug this memory usage bug in CosmWasm 1.3 and 1.4.

Getting started

1. Go to repo root and run

   cargo run --features dhat-heap --example heap_profiling --release
   

2. Open dhat-heap.json in DHAT Viewer
3. Enjoy

Reading the output

• t_gmax is the time of the highest memory usage
• t_end is the time of the process end

Customising

• The --runtime argument allows for longer testing periods, e.g. for running tests for 2 minutes do

  cargo run --features dhat-heap --example heap_profiling --release -- --runtime 120
  

• In fn contracts() you can change the contracts that are executed

Useful links

• DHAT: a dynamic heap analysis tool
• DHAT Viewer
• dhat-rs: GitHub crates.io