---
title: "Interrupts and System Calls"
summary: "Interrupts and System Calls: a page of the HPC note."
date: 2026-09-11
author: hpcnotes
kind: note
parent: hpc-architecture
order: 9
tags: hpc
draft: false
---

Leaving user mode is a fence. Batch syscalls; do not sample the kernel in the inner loop.