Johnny's Software Lab

Johnny's Software Lab

We help you deliver fast software

  • Home
  • Performance
    • 2 Minute Reads
    • C++ Performance
    • Standard Library and Performance
    • Algorithms and Performance
    • Toolchain and Performance
    • Help the Compiler
    • Performance Analysis Tools
    • Computational Performance
    • Low Level Performance
    • Parallelization
    • Multithreaded Performance
    • Performance Contest
  • Debugging
  • Developer Tools
  • Vectorization Workshop
  • Need help?
  • Talks
  • Contact
  • About us
Menu

All posts in January 2021

Crash course introduction to parallelism: SIMD Parallelism

Crash course introduction to parallelism: SIMD Parallelism

Posted on January 19, 2021March 19, 2022Author Ivica BogosavljevićPosted in Computational Performance, Low Level Performance, Parallelization, PerformanceLeave a Reply

This is the first article about hardware support for parallelization. We talk about SIMD, an extension almost every processor nowadays has that lets you speed up your program.

2-minute read: How is Big O notation relevant on modern systems?

2-minute read: How is Big O notation relevant on modern systems?

Posted on January 10, 2021March 19, 2022Author Ivica BogosavljevićPosted in 2 Minute Reads, Algorithms and Performance, PerformanceLeave a Reply

Big O notation is commonly used to describe algorithm performance. But modern hardware makes performance analysis much harder than it used to be. In this short article we give three interesting examples to illustrate the limits of big O notation.

Crash course introduction to parallelism: the algorithms

Crash course introduction to parallelism: the algorithms

Posted on January 4, 2021March 19, 2022Author Ivica BogosavljevićPosted in Parallelization, PerformanceLeave a Reply

When it comes to performance, there are two ways to go: one is to improve the usage of the existing hardware resources, the other is to use the new hardware resources. We already talked a lot about how to increase the performance of your program by better using the existing resources, for example, by decreasing…

Read

Like what you’re reading? Follow us!

  • Growing Buffers to Avoid Copying Data
  • Performance Debugging with llvm-mca: Simulating the CPU!
  • FIYA – Flamegraphs in Your App
  • Memory Subsystem Optimizations – The Remaining Topics
  • Speeding Up Convergence Loops. Or, on Vectorization and Precision Control

Recent Posts

  • Growing Buffers to Avoid Copying Data
  • Performance Debugging with llvm-mca: Simulating the CPU!
  • FIYA – Flamegraphs in Your App
  • Memory Subsystem Optimizations – The Remaining Topics
  • Speeding Up Convergence Loops. Or, on Vectorization and Precision Control

Recent Comments

  • Ivica Bogosavljević on Performance Debugging with llvm-mca: Simulating the CPU!
  • Denis Bakhvalov on Performance Debugging with llvm-mca: Simulating the CPU!
  • Cai on Loop Optimizations: interpreting the compiler optimization report
  • River on What is faster: vec.emplace_back(x) or vec[x] ?
  • Ivica Bogosavljević on Speedscope: visualize what your program is doing and where it is spending time

Archives

  • March 2025
  • January 2025
  • December 2024
  • October 2024
  • August 2024
  • June 2024
  • April 2024
  • March 2024
  • February 2024
  • January 2024
  • December 2023
  • November 2023
  • October 2023
  • September 2023
  • August 2023
  • July 2023
  • June 2023
  • May 2023
  • April 2023
  • March 2023
  • February 2023
  • January 2023
  • December 2022
  • November 2022
  • October 2022
  • September 2022
  • August 2022
  • July 2022
  • June 2022
  • May 2022
  • April 2022
  • March 2022
  • February 2022
  • January 2022
  • December 2021
  • November 2021
  • October 2021
  • September 2021
  • August 2021
  • July 2021
  • June 2021
  • May 2021
  • April 2021
  • March 2021
  • February 2021
  • January 2021
  • December 2020
  • November 2020
  • October 2020
  • September 2020
  • August 2020
  • July 2020
  • June 2020
  • May 2020

Categories

  • 2 Minute Reads
  • Algorithms and Performance
  • C++ Performance
  • Computational Performance
  • Data Structure Performance
  • Debugging
  • Developer Tools
  • Help the Compiler
  • Kernel Space and Performance
  • Low Level Performance
  • Memory Footprint
  • Memory Subsystem Performance
  • Multithreaded Performance
  • Parallelization
  • Performance
  • Performance Analysis Tools
  • Performance Contest
  • Reliability
  • Standard Library and Performance
  • System Design
  • Toolchain and Performance
  • Vectorization

Meta

  • Log in
  • Entries feed
  • Comments feed
  • WordPress.org

©2025 Johnny's Software Lab | WordPress Theme by Superb WordPress Themes