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Systems & Performance
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1573

The power of two random choices

In many large-scale web services, multiple layers of stateless and stateful services are seperated by load balancers. Load balancing can be done with dedicated hardware, with dedicated software load balancers, using DNS trickery or through a load-balancing mechanism in the client. In large systems, the resources and…

1575

Billion file filesystem

For a lark I made an ext4 file system with a billion empty files. https://gitlab.com/larswirzenius/create-empty-files has the program I wrote for this. I've done this before , but this time I made it a little simpler for me to do it again: everything in one Rust program rather than clunky scripts.

1583

RavenDB 6.0.2 (A Jepsen Report)

RavenDB is a distributed document database which repeatedly advertises its support for ACID transactions. 1 It’s intended for OLTP workloads, and offers a variety of ETL paths for exporting data to other systems. Its transactional API revolves around a session handle, which “represents a single business transaction on…

1586

On the Costs of Syscalls (2021)

It's well known that syscalls are expensive. And that software mitigations against CPU bugs (such as Meltdown) even have made them more expensive. But how expensive are they really? To begin to answer this question I wrote a small micro-benchmark in order to measure the minimal costs of a syscall …