Inference Speed in Linux is Three Times Faster than in Windows

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The Shift from Windows to Linux: A Developer’s Journey into AI Performance

In a fascinating turn of events, a developer known as Inevitable-Start-653 recently shared his experience of transitioning from Windows to Linux after a remarkable 30-year tenure with Microsoft’s operating system. This shift was not merely a change of scenery; it resulted in significant performance enhancements for his AI-specific tasks, particularly when utilizing a formidable setup of six 24GB graphics cards.

The Bottleneck of Windows

As Inevitable-Start-653 expanded his GPU setup, he began to notice a troubling trend: the performance on Windows was deteriorating. Despite leveraging high-performance inferencing software like Oobabooga’s Textgen, the overhead of the Windows operating system became a substantial bottleneck. This is a common issue for developers pushing the limits of consumer-grade hardware, where the operating system’s resource consumption can hinder the performance of demanding applications.

In an effort to alleviate these performance issues, he experimented with the Windows Subsystem for Linux (WSL), integrating tools like DeepSpeed and upgrading to PyTorch 2.2. Unfortunately, these attempts yielded minimal improvements in inferencing speeds. It became clear that the limitations of WSL were holding back the full potential of his hardware.

The Transition to Ubuntu

Upon transitioning to a dual-boot setup with Ubuntu Linux, the results were nothing short of dramatic. Inferencing speeds reportedly increased by approximately 3x, allowing for more VRAM to be allocated for context, which in turn enhanced overall system responsiveness. This leap in performance not only accelerated AI tasks but also opened the door to working with larger models and datasets, paving the way for more advanced AI applications and research.

When comparing the performance of Stable Diffusion on both Ubuntu and Windows, Ubuntu emerged as the clear winner, boasting a lead of 9.5%. This suggests that Linux not only excels in inference tasks but also integrates seamlessly with text-to-image models, further solidifying its reputation as the go-to operating system for AI development.

What Went Wrong with WSL?

The shortcomings of WSL in the context of AI tasks are multifaceted. At its core, WSL operates as a virtual machine running Linux over Windows, which inherently leads to resource consumption by the Windows host. This architecture means that even with optimizations, WSL cannot match the performance of a native Linux installation.

A Reddit user conducted a comparative analysis of AI capabilities across Windows, WSL, and Ubuntu, revealing that both Windows and WSL performed similarly, while Ubuntu outpaced them by approximately 20-30% in text generation tasks and an impressive 50-60% in image generation workloads. One user even remarked, “I ended up uninstalling all my WSL installs. For some reason, it took more space than an actual Ubuntu install and didn’t offer any performance gains either.”

The Challenges of WSL

Two critical issues plague developers using WSL for AI tasks. First, WSL struggles with I/O operations between the Windows and Linux environments. Given that AI datasets are often large, transferring them between these two systems can consume more time than the actual processing, leading to inefficiencies that can be frustrating for developers.

Second, the graphical user interface (GUI) on WSL has been reported as unstable. While it is possible to use a GUI with WSL, many users have found it unreliable, often recommending a full Linux installation on a secondary machine for a smoother experience.

The Solution?

While WSL is not without its merits—some developers appreciate its convenience for quick tasks without the hassle of a full Linux installation—it falls short for those engaged in heavy and complex workloads. For serious AI development, a bare-metal installation of Linux is often the recommended route.

Admittedly, Linux can present its own set of challenges. Users may encounter driver issues, particularly with the latest hardware, and it is often advised to opt for slightly older components to ensure compatibility and support. However, for those willing to invest the time and effort, the performance benefits can be substantial.

For those considering a Linux installation, many users recommend Ubuntu’s Long Term Support (LTS) version for its stability, while others prefer Arch Linux for access to the latest packages. Each distribution has its strengths, and the choice often depends on the specific needs and preferences of the developer.

In summary, the journey from Windows to Linux for AI tasks is not just a matter of preference; it can significantly impact performance and efficiency. As more developers explore the capabilities of Linux, the community continues to grow, fostering an environment ripe for innovation in the field of artificial intelligence.

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