Week 4, issue in compiling openVM

Summary

Teams have been finalised. It will be me and senpai benchmarking zkVMs in Ream. Unnawut will be our mentor. Senpai has already worked on Jolt and gave a detailed presentation suggesting, among other things, the costruction of a modular benchmark environment that can test various zkVMs.

Current issue, compilation error

I am currently working on openVM. There is an associated book with a Quickstart guide. The issue occurs in the following example

1. Initialise a Rust project cargo init my_project
2. Modify Cargo.toml to include openvm dependency
3. Include some code in src\main.rs
4. Use cargo openvm build to build the openvm project

error: target is not supported. You may need to define a custom backend see: https://docs.rs/getrandom/0.3.3/#custom-backend

Things I tried

1. Clicking on the error link and trying to figure out how to create a custom backend
2. Following the solution proposed by senpai for jolt by adding a custom getrandom in guest, see here. It is very probable that I didn’t implement it properly
3. Asking an LLM

The issue with proposed solutions on the internet is a breaking update that happened on version 0.3.0 of getrandom. Many features got depreciated such as the feature custom. It was this feature that enabled the backend. I am still trying to think of a solution. If useful, I will create a minimal working example (MWE). In fact, a MWE already exists just follow the instructions of Quickstart.

An interesting proposal for next weeks

There is an open issue Current zkVM Implementation Analysis that proposes a candidate method that can be used to benchmark various zkVMs in a common framework.