Heap profiling

WARNING

This page needs review, because this procedure does not work anymore, see #2.

The DHAT tool can be used for heap profiling to detect memory leaks or excessive memory usage. This tool 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. Navigate to the root directory of the cosmwasm repository 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

References

• DHAT: a dynamic heap analysis tool
• DHAT Viewer
• dhat-rs