# Modern I/O and Storage Systems for Scientific Computing (Lecture 2)

- Institution: CERN
- Speaker: Gianmaria Del Monte
- Year: 2026
- Language: English
- Subjects: Computer science
- Source: [CERN](https://videos.cern.ch/record/3023655)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

# Abstract

I/O bottlenecks are often the hidden performance killers in HEP data analysis, yet many scientists lack a deep understanding of how storage systems actually work. This lecture demystifies the complete I/O stack (from application code to physical storage) and introduces both classical and modern techniques for optimal performance. We'll explore fundamental concepts (buffered I/O, direct I/O, mmap), diagnose real bottlenecks using Linux tools, and cover network I/O patterns critical for Grid jobs. The session culminates with modern asynchronous I/O APIs like io_uring that are revolutionizing high-performance computing. Participants will leave with practical skills to optimize their analysis workflows and a solid foundation for future learning.

# Topics ## Fundamentals and Diagnosis * I/O stack and core concepts * Diagnosing I/O performance problems * Optimization strategies for local storage

## Network I/O, Frameworks, and Modern APIs * Network I/O for Grid Computing * Modern Asynchronous I/O APIs * Quick reference for common HEP scenarios

## Hands-On Session (examples) * Profile and diagnose I/O bottlenecks in analysis code * Optimize ROOT analysis workflow * Build simple async storage system with io_uring

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## Lectures

1. [Modern I/O and Storage Systems for Scientific Computing (Lecture 2)](https://invisiblenetwork.ai/learn/cern/3023655/877e2d464b10), 56 min (CERN's player)