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What are the differences between parallel EVMs and Arbitrum Stylus?

What are the differences between parallel EVMs and Arbitrum Stylus?

BlockworksBlockworks2024/01/27 05:52
By:Blockworks

Offchain Labs’ tech lead Rachel Bousfield breaks down some misconceptions on the effectiveness of parallel EVMs

Parallelizing the Ethereum Virtual Machine (EVM) has been a topic of interest for many in the cryptocurrency space in recent weeks.

Parallelization increases transaction throughput and improves blockchain scalability by executing multiple transactions simultaneously rather than in the sequential order in which they arrive. 

However, Rachel Bousfield, tech lead at Offchain Labs, told Blockworks in an interview that people often overstate the value of parallelism.

“The kinds of returns and fee reductions that people expect don’t really play out in practice,” Bousfield said. “A lot of the times when people talk about fees being cut due to parallelism, it’s often cut due to other things that are around it.”

Read more: Parallelized EVMs are gaining popularity, but they won’t scale blockchains alone

Bousfield explains that different blockchains have different hardware requirements. In the case of Ethereum , the blockchain is designed to ensure that running a node is relatively inexpensive and that low-end computers are able to meaningfully contribute to the Ethereum network in the form of running applications or running validators .

This differs from other blockchains, which may enable parallelism, but the cost demands for running a node become much higher. 

Ryan Watkins is the co-founder of Syncracy Capital, on Solana — a network that does enable parallelism. According to a post by Watkins, it is estimated that the cost to run a node is five times more expensive to run than Ethereum nodes. He said that the network currently has an estimated 40% of the number of nodes that Ethereum has.

“If Ethereum wanted to, they could dramatically increase the demands and costs of running an Ethereum validator, and you would see performance improve, there’d be more capacity, and people’s fees would be lower, but is that really the kind of scaling that Ethereum wants in its future? It’s not clear to me that that would be an advisable decision,” Bousfield said.

Read more: Scaling Ethereum’s virtual machine is a ‘solvable problem,’ says Monad Labs’ Galler

Additionally, Bousfield notes that parallelism enables throughput to improve efficiency when there are multiple users wanting to do different kinds of things in crypto at the same time. 

“The problem is that in real life, the actual demand we see on these blockchain networks is when people want to do very similar things to each other. When there is an airdrop , everyone wants to mint it at the same time . When there is a price discrepancy between DEXs , everybody wants to rush in and get MEV arbitrage out of it,” Bousfield said.

She notes that the technical term to describe this type of activity is called “contention,” adding that gas prices are often the highest when multiple people hope to do the same thing.

In fact, a recent study by Polygon Labs shows that parallelism is applicable to around 55% of the transactions in most blocks on its network. 

“This means that if parallelism was perfect, had a million cores, and ran really, really fast to the point where everything parallelized was executed instantaneously, you could, at best, double Polygon ’s capacity with that,” she explained. 

With that said, Bousfield notes that parallelism itself is not a bad thing, but it is not the silver bullet that many are anticipating.

On tackling the problem around transaction speeds and ways to increase throughput, Bousfield notes that Arbitrum Stylus achieves this by making it simpler for hardware to read and interpret data .

In a traditional EVM , when the hardware receives data, it must check that it is accurate, enable branches and simulate it in memory — steps that often take a great deal of time. In contrast, Bousfield notes that Stylus is designed to speak the language of the central processing unit (CPU).

“By removing that layer of interpretation, Stylus is able to get a 10-100x speed on all compute workloads,” she said. “I think that strategies like this are where the big gains are going to be.”

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Tags
  • Arbitrum
  • Ethereum
  • EVM
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Disclaimer: The content of this article solely reflects the author's opinion and does not represent the platform in any capacity. This article is not intended to serve as a reference for making investment decisions.

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