# Concurrency, BFS vs DFS (and a proposal)

**URL:** https://forum.tezosagora.org/t/concurrency-bfs-vs-dfs-and-a-proposal/1994
**Category:** Research and Development
**Tags:** michelson
**Created:** [June 8, 2020, 1:11am UTC](https://forum.tezosagora.org/t/concurrency-bfs-vs-dfs-and-a-proposal/1994 "2020-06-08T01:11:25Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![rafoo](https://forum.tezosagora.org/letter_avatar_proxy/v4/letter/r/f08c70/32.png) [@rafoo](https://forum.tezosagora.org/u/rafoo)
#### Post date: [June 8, 2020, 8:07am UTC](https://forum.tezosagora.org/t/concurrency-bfs-vs-dfs-and-a-proposal/1994/2 "2020-06-08T08:07:19Z")

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> An alternative would be to have  
> call-return without effects (only fail/no-fail)

See [Adding Read-Only Calls](https://forum.tezosagora.org/t/adding-read-only-calls/1227) for a discussion on this topic.

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