Category Archives: uiforetw

Bulk ETW Trace Analysis in C#

Posted on January 5, 2020 by

ETW traces record a wealth of information about how a Windows system is behaving. When analyzing a new and unknown problem there is no replacement for loading the trace into WPA and following the clues to a solution. The thrill … Continue reading →

Posted in uiforetw, xperf | Tagged , | 8 Comments

O(n^2), again, now in WMI

Posted on December 8, 2019 by

I recently hit some multi-minute delays on my workstation. After investigating I found that the problem was due to a lock being held for five minutes, and during that time the lock-holder was mostly just spinning in a nine-instruction loop. … Continue reading →

Posted in Investigative Reporting, Programming, Rants, uiforetw, xperf | Tagged , , , , | 43 Comments

Heap Snapshots–Tracing All Heap Allocations

Posted on October 27, 2019 by

I’ve recently started using heap snapshots on Windows to track heap allocations. I was able to use heap snapshots to record call stacks for all outstanding allocations in Chrome’s browser process over a full two weeks, letting me account for … Continue reading →

Posted in Documentation, Performance, Programming, uiforetw, xperf | Tagged , | 13 Comments

63 Cores Blocked by Seven Instructions

Posted on October 20, 2019 by

I seem to have a habit of writing about super powerful machines whose many cores are laid low by misuse of locks. So. Yeah. It’s that again. But this one seems particularly impressive. I mean, how often do you have … Continue reading →

Posted in Investigative Reporting, Performance, Programming, uiforetw, xperf | Tagged , , | 37 Comments

Taskbar Latency and Kernel Calls

Posted on September 8, 2019 by

I work quickly on my computer and I get frustrated when I am forced to wait on an operation that should be fast. A persistent nuisance on my over-powered home laptop is that closing windows on the taskbar is slow. … Continue reading →

Posted in Investigative Reporting, Performance, uiforetw, xperf | Tagged , , , | 34 Comments

When Your Profiler Lies

Posted on December 9, 2018 by

Last week I wrote about the performance consequences of inadvertently loading gdi32.dll into processes that are created and destroyed at very high rates. This week I want to share some techniques for digging deeper into this behavior, and the odd … Continue reading →

Posted in Investigative Reporting, Performance, Programming, uiforetw, xperf | Tagged , , | 20 Comments

What is Windows *doing* while hogging that lock

Posted on July 27, 2017 by

Earlier this month I wrote about how Windows 10 holds a lock during too much of process destruction, which both serializes this task and causes mouse-cursor hitches and UI hangs (because the same lock is used for these UI tasks). … Continue reading →

Posted in Investigative Reporting, uiforetw, xperf | Tagged , , | 19 Comments