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I was surprised by how simple an allocator is

Table of Contents Introduction Recently I was looking at an issue on mimalloc, a "state-of-the-art" memory allocator developed by Microsoft. The issue was quite simple, developers wanted a way to preallocate a piece of memory and use it as mimalloc's heap. Seeing that mimalloc does not offer this feature, I thought: "how hard can it be to write a memory allocator to manage a preallocated region?". The answer to this question is: "given enough time, even a monkey with a typewriter can write

RaptorCast: Designing a Messaging Layer

RaptorCast: Designing a Messaging Layer ‍ In Proof of Stake blockchains, a pre-determined leader typically proposes a block of transactions at each round. The propagation of this block to all validators is one of the most challenging and time-consuming steps in the consensus protocol. In this blog post, we examine RaptorCast, a solution designed to address the following considerations: Performance - a block proposal needs to be sent quickly to the rest of the network Security - each recipien

Real-time action chunking with large models

Published June 9, 2025 Email [email protected] Kevin Black, Manuel Y. Galliker, Sergey Levine Unlike chatbots or image generators, robots must operate in real time. While a robot is “thinking”, the world around it evolves according to physical laws, so delays between inputs and outputs have a tangible impact on performance. For a language model, the difference between fast and slow generation is a satisfied or annoyed user; for a vision-language-action model (VLA), it could