Category Archives: uiforetw

24-core CPU and I can’t move my mouse

This story begins, as they so often do, when I noticed that my machine was behaving poorly. My Windows 10 work machine has 24 cores (48 hyper-threads) and they were 50% idle. It has 64 GB of RAM and that … Continue reading

Posted in Investigative Reporting, uiforetw, xperf | Tagged , , | 155 Comments

WPA Symbol Loading is Much Faster, but Broken for Chrome

There’s good news, and there’s bad news. The good news is that the latest Windows Performance Analyzer (WPA), the visualization tool for ETW (Event Tracing for Windows) traces, can now load symbols faster than ever before – it’s multi-threaded, and … Continue reading

Posted in uiforetw | Tagged , , , | 4 Comments

ETW Flame Graphs Made Easy

A bit over three years ago I wrote about how to use flame graphs to visualize CPU Usage (Sampled) data from ETW, and a year ago I added flame graph support to UIforETW. However these techniques are clumsy and slow … Continue reading

Posted in Performance, uiforetw, xperf | Tagged , , | 25 Comments

UIforETW is No Longer a CPU Hog

A few months ago I wrote about how many processes on my system were waking up and wasting CPU time for no good reason, thus wasting battery power, electricity, and CPU power. I was surprised that nobody called me out … Continue reading

Posted in Performance, uiforetw, xperf | Tagged , | 6 Comments

Power Wastage On An Idle Laptop

Ever since I upgraded to Windows 10 it’s felt like my battery life is worse. My suspicion was various scanning tasks that were springing to life more frequently, but it was just a hunch. So, I did what I do … Continue reading

Posted in Investigative Reporting, Performance, Programming, uiforetw, xperf | Tagged , | 32 Comments

ETW Central

Over the last few years I’ve written over forty blog posts that discuss ETW/xperf profiling. I’ve done this because it’s one of the best profilers I’ve ever used, and it’s been woefully undersold and under documented by Microsoft. My goal … Continue reading

Posted in uiforetw, xperf | Tagged , , , , | 38 Comments

Xperf Basics: Recording a Trace (the ultimate easy way)

If your Windows computer is running slowly – if a program takes a long time to launch, if a game has a poor frame rate, or if an idle application uses too much CPU time – the best way to … Continue reading

Posted in Performance, Programming, uiforetw, xperf | Tagged , , | 39 Comments