Back to feed
Dev.to
Dev.to
7/14/2026
The pool that got slower the more we shared it

The pool that got slower the more we shared it

Short summary

A detailed walkthrough of using an LLM-powered dotnet-diagnostics MCP tool to track down a 20% CPU regression caused by ArrayPool<byte>.Shared thread contention in a .NET market-data gateway. The investigation reveals that the shared pool's internal locking creates Monitor.Enter slow-path contention when buffers are rented and returned across threads at high frequency. The post demonstrates a structured diagnostic approach: orient, sample, trace, and decompile.

  • •ArrayPool<byte>.Shared caused 15.8% CPU in Monitor.Enter slow-path contention
  • •LLM-assisted dotnet-diagnostics-mcp tool guided the root-cause investigation
  • •Structured approach: orient → sample → trace callers → decompile runtime internals

Generated with AI, which can make mistakes.

#ai-tools#open-source
Read full article at Dev.to

Is this a good recommendation for you?

Comments

Failed to load comments. Please try again.

Explore more

Measuring Token Cost and Latency of 6 MCP Servers Behind a Single Agent
Dev.to
The original title is: "AI Wrote a Thread-Safe Counter. The CPU Made It 5x Slower."
Dev.to
MCP Deep Dive, Part 10: When the Agent Feels Off — Debugging and Observability for MCP in Production
Dev.to
MCP Shows What the Agent Did. eBPF Shows Why the GPU Stalled.
Dev.to