Garnet Consulting

Microsoft's next-generation cache store with Garnet

Garnet is a high-performance, Redis-compatible cache store from Microsoft Research. It delivers higher throughput, lower latency, and deeper .NET integration than traditional Redis deployments.

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Key highlights

What makes Garnet a compelling alternative to Redis.

Higher throughput than Redis

Benchmarked at significantly higher transactions per second than Redis for most workloads. Garnet's C# implementation uses modern .NET performance techniques including async I/O, pipelining, and memory-efficient data structures.

Drop-in Redis compatible

Garnet speaks the RESP protocol, meaning existing Redis clients — StackExchange.Redis, ioredis, redis-py — work without modification. You can switch from Redis to Garnet by just changing the connection string.

Built for .NET ecosystems

Garnet is written in C# and designed to integrate naturally with .NET applications. It's smaller and more efficient than a Redis process, making it ideal for sidecar deployments alongside ASP.NET Core services.

Why Garnet is the future of caching

Microsoft Research's answer to modern caching demands.

Redis compatibility without the C legacy.

Redis is written in C and has accumulated decades of architectural decisions. Garnet builds on the same RESP protocol but with a modern C# codebase, making it easier to deploy, configure, and extend in .NET environments.

Perfect for Aspire deployments.

Garnet integrates seamlessly with .NET Aspire. A single line adds Garnet to your orchestration: `builder.AddGarnet("garnet", password)`. No separate container image, no complex configuration — Garnet runs as a managed .NET process.

Smaller memory footprint.

Garnet uses less memory than Redis for equivalent workloads. Its .NET-native memory management and efficient serialization mean you can store more data on the same hardware, reducing cloud infrastructure costs.

Open source and actively developed.

Garnet is open source under MIT license and actively developed by Microsoft Research. It's production-tested at Microsoft scale and benefits from continuous performance improvements and feature additions.

Why we recommend Garnet

Garnet is our top pick for .NET-native, high-throughput caching.

Garnet represents a significant leap forward for .NET teams that depend on in-memory caching. Developed by Microsoft Research, Garnet is a drop-in Redis replacement that delivers higher throughput, lower latency, and deeper .NET integration — all while speaking the standard RESP protocol that existing Redis clients understand.

We recommend Garnet when performance is the primary concern and your stack is built on .NET. Benchmarks show Garnet consistently outperforming Redis across a range of workloads, often delivering 2-3x higher throughput for the same hardware. Its C# implementation leverages modern .NET features including async I/O, pipelining, and Span-based memory management for maximum efficiency.

The Aspire-native integration is another compelling reason. With Aspire, adding Garnet to your orchestration is a single line of code: builder.AddGarnet("garnet", password). No separate container image, no Docker Compose file, no Redis configuration — Garnet runs as a managed .NET process within your Aspire application model.

For .NET shops, Garnet's smaller memory footprint and operational simplicity translate directly to lower cloud costs. You can serve more data from the same hardware, deploy it as a sidecar alongside ASP.NET Core services, and manage it with tools your team already knows. If your team is all-in on .NET, Garnet is the cache store that fits naturally.

Where Garnet fits in the stack

Understanding the architectural role of Garnet in .NET applications.

Alongside ASP.NET Core services

Garnet runs as a managed .NET process alongside your ASP.NET Core applications, sharing the same runtime and tooling. Deploy it as a sidecar container, configure it with environment variables your team already understands, and monitor it with the same Application Insights instrumentation.

Sidecar deployment in containers

Garnet's small footprint makes it ideal for sidecar deployment patterns. Run a Garnet instance in the same pod or container group as your application for local caching with sub-millisecond latency, without the overhead of a separate Redis container or external cache cluster.

Aspire-orchestrated applications

Within .NET Aspire, Garnet is a first-class citizen. Add it to your AppHost with a single line, and Aspire handles connection string management, health checks, dashboard monitoring, and integrated logging — all without manual configuration or YAML files.

High-throughput caching tier

For workloads demanding maximum throughput — API response caching, database query result caching, or session state — Garnet's superior performance delivers more operations per second on the same hardware. This makes it ideal for high-traffic .NET applications where every microsecond counts.

How to choose the right Garnet for the job

Guidance on when Garnet is the right choice — and when it isn't.

Choose Garnet if your team is primarily .NET, you're using Aspire, and maximum throughput is your goal. The deeper .NET integration, smaller footprint, and higher performance are compelling advantages. Choose Redis if you need a proven enterprise ecosystem, Redis Modules like RediSearch, multi-language client support, or if your operations team has established Redis expertise. For polyglot environments or teams needing Redis's extensive third-party tooling, Redis is still the safer bet.

The performance gap between Garnet and Redis is most pronounced in high-throughput scenarios — think 100,000+ operations per second on a single instance. For most applications, both will be fast enough. The difference matters when you're pushing the limits of your hardware, running at extreme scale, or want to reduce the number of cache nodes needed. If you're currently at Redis's throughput ceiling and scaling vertically isn't working, Garnet can buy you significant headroom on the same hardware.

Ecosystem maturity matters when you rely on Redis Modules (RediSearch, RedisJSON, RedisGraph), third-party monitoring tools, or multi-language client libraries. Garnet supports the core RESP protocol and common Redis commands, but doesn't yet have the same breadth of extensions or tooling. If your architecture depends on Redis Modules for search or graph capabilities, Redis remains the right choice. For standard caching, session storage, and pub/sub patterns — which cover 80% of use cases — Garnet's compatibility is sufficient.

Yes, migration is straightforward. Garnet speaks the RESP protocol, so existing Redis clients work without changes — you simply update the connection string. For data migration, you can use Redis's MIGRATE command or write a simple script to copy keys from Redis to Garnet. For zero-downtime migration, run both in parallel, warm the Garnet instance, then cut traffic over. Our team regularly performs these migrations for clients with no measurable downtime.

When to choose Garnet

A decision framework for project leaders.

Ideal for

.NET applications needing a high-performance cache store
Teams already using Redis looking for better performance
Aspire-orchestrated applications with integrated caching
Sidecar cache deployments alongside ASP.NET Core services
Greenfield .NET projects wanting a native caching solution

Less suited for

Non-.NET ecosystems where Redis has broader client support
Applications requiring mature Redis modules like RediSearch
Existing Redis deployments with complex Sentinel configurations
Teams needing the largest ecosystem of third-party tools

Ready to supercharge your application caching?

Let's explore how Garnet can deliver Redis-compatible performance with deeper .NET integration.

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