Tailslayer — DRAM Hedged Read Library

Skill by ara.so — Daily 2026 Skills collection.

Tailslayer is a C++ library that reduces tail latency in RAM reads caused by DRAM refresh stalls. It replicates data across multiple independent DRAM channels with uncorrelated refresh schedules, issues hedged reads across all replicas simultaneously, and returns whichever result responds first — eliminating worst-case stall spikes from DRAM refresh cycles.

Works on AMD, Intel, and AWS Graviton using undocumented channel scrambling offsets.

How It Works

Data is replicated N times, each copy placed on a different DRAM channel
Each replica is monitored by a worker pinned to a separate CPU core
When a read is triggered (via your signal function), all replicas are read simultaneously

Tailslayer — DRAM Hedged Read Library

Skill by ara.so — Daily 2026 Skills collection.

Works on AMD, Intel, and AWS Graviton using undocumented channel scrambling offsets.

How It Works

Data is replicated N times, each copy placed on a different DRAM channel
Each replica is monitored by a worker pinned to a separate CPU core
When a read is triggered (via your signal function), all replicas are read simultaneously

Parameter	Description
`T`	Value type stored and read
`SignalFn`	Function that waits for a trigger and returns the index to read
`WorkFn`	Function called with the value immediately after read
`SignalArgs`	(optional) `tailslayer::ArgList<...>` of compile-time args to signal function
`WorkArgs`	(optional) `tailslayer::ArgList<...>` of compile-time args to work function

Tailslayer Dram Hedged Reads

Tailslayer — DRAM Hedged Read Library

How It Works

Tailslayer Dram Hedged Reads

Tailslayer — DRAM Hedged Read Library

How It Works

Installation

Copy the header into your project

Include in your code

Build the provided example

Key API

`tailslayer::HedgedReader<T, SignalFn, WorkFn, SignalArgs, WorkArgs>`

Constructor optional parameters

Methods

Utilities

Helm Chart Scaffolding

Python Observability

K8s Manifest Generator

Istio Traffic Management

Secrets Management

Gitops Workflow