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Installation | Microsoft Docs.Xperf Basics: Recording a Trace (the easy way) | Random ASCII – tech blog of Bruce Dawson |
Thursday, August 25, 2022
- Windows 7 xperf free
Windows 7 xperf free
Microsoft recommends not checking too many of the wprui check boxes, in order to avoid increasing the data rate too much. Your mileage may vary. You can use xperf -loggers for debugging configuration files. It dumps detailed information about all enabled providers and you can search through it to see if the providers you requested got enabled.
You can find some documentation about profile definitions. The problem then was that the options for zooming in wpa were needlessly hidden. I think wprui takes a lack of discoverability to new heights.
In order to find the global keyboard shortcut for wprui all I had to do was look in this file:. Of course! Displaying it in the UI would have been too obvious. Use wprui. Out of the box it is the easiest way of recording xperf traces.
With a bit of configuration you can get it to record custom user events which make trace navigation much easier. Pull requests welcome. Thanks for letting me know. That seems like an odd way to implement this rather important feature.
Where do you put the FileCompressionType tag? My tool just compresses traces into. Pretty simple, and it works on all versions of Windows. Sorry, I probably should have tried the file compression feature before commenting about it.
You were saying something about discoverability and documentation…. Well, at least I can look forward to compressed traces in the future. Compressed traces that transparently decompress and compressed. First, it tells me that an existing session is already running. Do either of those problems sound familiar?
You should try to figure out who else is recording kernel ETW data. Some tools, such as powercfg, also use the kernel ETW providers and therefore cannot run at the same time that wprui is recording. If you have just rebooted then nobody else should be recording. Unfortunately it can be hard to figure out what is normal in the undocumented output of xperf -loggers — maybe compare the results to a machine where wprui works? How do you handle other non Windows platforms when writing an application that contains custom ETW provider code.
Do you simply wrap any ETW related code with a define so it is compiled out or do you have a more complex macros that produce ETW code on Windows and alternate profiling code on other platforms? In the sample code in MultiProvider.
The alternate implementations are just empty inline functions, but they could contain whatever you want. Very informative Bruce. I have tried to create a custom xml to configure my traces as I would like them but failed.
I wanted to enable them in the UI but no matter what the default providers were always turned on. The console application does really use your custom profile….
If you are into. NET 4. I just thought about creating my own Gui-Tool to select which events should be recorded. It is a corporate build machine, may be that is the reason. Hi Bruce the link to download MultiProvider. It works for me famous last words. In this article. What's New in the Windows Performance Toolkit. Windows Performance Recorder. Provides complete documentation for WPR. Xperf Command-Line Reference. Windows Performance Analyzer. It's possible to get around that by doing a simultaneous capture of non-heap data.
Note that it's possible to capture even more data for the non-heap profile; for example, you might want to be able to correlate heap events with performance data, so you can do " xperf -on base -stackwalk profile ". In the viewer, when summary data is viewed for heap events Heap Allocations Outstanding, etc.
These refer to the time range that was selected for the summary graph; for example, something that's in the AOFI category was allocated before the start of the selected time range, but the free event happened inside. To get good data from a Firefox build, it is important to build with the following options in your mozconfig:. This disables frame-pointer optimization which lets xperf do a much better job unwinding the stack.
Traces can be captured fine without this option for example, from nightlies , but the stack information will not be useful. Deadlocks are a pain. Your best bet there is to capture a crashdump, using procdump. It all looks nice when you explain this, but it looks like you need lots of inside knowledge. I had a look through some providers and for me it looks like a full time job digging through all those events generated by for example, Generic Events section of System Activity tab.
You are correct that learning this is extremely difficult due to the lack of comprehensive documentation. I have documented a lot of this but far from all. The lack of documentation of what different providers are for, and what stackwalk events are associated with providers, is a particular pet peeve.
You can see the documentation that I have created here:. Maybe someday Microsoft will explain the rest. The good news is that UIforETW provides good defaults and my blog explains most of the key concepts, and those concepts then prepare you for some explorations beyond the norm. Thanks for the fast response, Bruce.
Is there a forum or site or discussion list where I can upload my Traces and I could get some pointers on what to do next? A support group would be interesting. If you find or create one, let me know, and maybe mention it on the tinyurl.
I suspect that this is internationalization confusion. But in most of Europe this would be written as 3. If there is a way then let me know. I guess I could reduce confusion by saying 3. But an idea: not having any separator would be unambiguous for sure.
Works for small numbers like thousands, but of course fails when talking about millions. Thank you for the suggestions and the reference. Using a space or half-space? I fear it will slightly reduce readability for those who are used to commas, but it is probably the correct tradeoff. You are commenting using your WordPress. You are commenting using your Twitter account. You are commenting using your Facebook account.
Notify me of new comments via email. Notify me of new posts via email. This site uses Akismet to reduce spam. Learn how your comment data is processed. Forecast for randomascii: programming, tech topics, with a chance of unicycling. Skip to content. Home About. The New Xperf is Here! This article was updated September to reflect WPA 10 and UIforETW In short, lots of profilers can tell you what your program is doing, but few profilers are excellent at telling you why your program is doing nothing.
Our story so far Xperf has a high learning curve. Finding the hang When profiling a transient problem such as a frame-rate glitch or a temporary hang the first challenge is to locate the hang in the trace.
Zooming in to the cause When analyzing an idle hang you should select the entire region of the hang, and it is particularly important to select the end of the hang. Who woke whom? To do wait analysis we need to display the table, by clicking on Display Graph and Table: We know need to drill down into New Process devenv. What about the other threads?
Click on the image for deeper details: We can see here that a Create file event, from devenv. The file name associated with this hang is quite peculiar.
Conclusion Once the cause of the hang was understood I modified our pre-build step to pipe the output through sed. This changes the hang-prone results before: to the hang-proof benign text after: I also reported the bug to the Visual Studio team.
Wait chains Some wait analysis investigations are more complicated than this one. Wait analysis is not baking Baking is all about precisely following a recipe — improvisation tends to lead to failure. Second opinion For another discussion of analyzing hangs with xperf see this wait analysis article by Trey Nash. Share this: Email Reddit Twitter. Like this: Like Loading About brucedawson I'm a programmer, working for Google, focusing on optimization and reliability.
Nothing's more fun than making code run 10x as fast. Unless it's eliminating large numbers of bugs. I also unicycle. And play ice hockey. And sled hockey. And juggle.
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