SagarNarayan

Solutions Engineer at Factory AI. I build internal tools, tinker with homelabs, and occasionally rewrite open source tools in Rust and Go to see what happens.

Latest: Rewriting wc in Rust See the code

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Now

What I'm working on

Factory AI

Solutions Engineering and building internal tools.

Rewriting

Open source tools in Rust and Go to learn how they work.

Homelab

Self-hosted stack across a Proxmox cluster.

0 services monitored

RustTypeScriptKubernetesProxmoxNext.jsGSAPTailwindDockerAnsibleGrafanaPostgreSQLRedisNginxWireGuardZigARM / NEON

Work

parser-go

Go HTTP service for parsing web logs, built in one Factory mission mode session with parity-gated benchmarks.

YAML

k8s-homelab

GitOps k3s cluster for homelab. Archived after migrating to LXC-based infrastructure.

Rust

xxhash-rs

Clean-room Rust reimplementation of xxHash with NEON-accelerated XXH3 and 508/508 parity tests.

Rust

the_silver_searcher

Incremental Rust rewrite of the Silver Searcher (ag) with published parity tooling and manifests.

Rust

wc-rs

AVX2 SIMD rewrite of GNU wc. 27x faster on default mode, 21x on char counting, with rayon multi-file parallelism.

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All repos

Writing

From the blog

All 5 posts

01Rewrite studybenchmarksrust

Rewriting wc in Rust

A Rust rewrite of GNU wc that uses AVX2 SIMD to count words at 7.5 GB/s -- 27x faster than GNU coreutils on the default mode, discovered through 12 systematic experiments where branchless scalar was a dead end and SIMD was the only path past 1 GB/s.

Apr 202614 min read

02Rewrite studybenchmarksgo

Rewriting a Python web log parser in Go

I rewrote a Python web log parser as a Go HTTP service. On 1.89 million lines of real NASA access logs, the Go version parses 3.3x faster than the Python baseline. A parity harness verifies both implementations produce identical output before allowing performance claims.

Mar 202612 min read

03Rewrite studybenchmarksrust

Rewriting xxHash in Rust

A clean-room Rust reimplementation of xxHash: bit-exact parity across all four variants, NEON/SSE2/AVX2 SIMD paths, and comparable CLI-level throughput to the C reference on Apple Silicon.

Mar 202612 min read

04Rewrite studybenchmarksrust

Rewriting the Silver Searcher in Rust

A Rust rewrite of ag that replaces PCRE with the regex crate, reproduces the multiline print state machine, and cuts median runtime roughly 2x on the measured workload -- but rg and ugrep are still faster.

Mar 20269 min read

05optimusautomation

Building Optimus in Public

Why I built an autonomous homelab SRE, how it works under the hood, and what I learned from real incidents.

Feb 202611 min read

All 5 posts

About

The backstory

StartedatCisco MerakiasaNetworkSupportEngineer.Networkingproblemsallday,whichturnedouttobeagoodwaytolearnhoweverythingactuallyworks.

WenttoVerkadaasaSolutionsEngineerdoingcamerasandaccesscontrol,thenendedupmanagingateamofSEs.

CametoFactory AIasaSolutionsEngineerbecauseItriedDroidsandlikedhowgoodtheproductwas,especiallythatit'smultimodelandplatformagnostic.Ialsobuildinternaltoolshere,whichistheworkIenjoymost.

OutsideofworkIrunahomelabandself-hosttoomanythings.IwriteaboutrewritingopensourcetoolsinRustandGo,publishingthebenchmarks,andseeingwhatmissionmodecanactuallyship.

Location

San Francisco, CA

Company

Factory AI

Career

Factory AI

Solutions Engineer

Verkada

Solutions Engineer, then SE Manager

Cisco Meraki

Network Support Engineer

Purdue University

Student