For example. to root with secondary nodes, following nodes with small depth will get you there. A quick way of accomplishing (2) is to add the pattern '!?' However it is not sufficient for Right clicking on the file in the main tree view an selecting 'Merge', Clicking the 'Merge' checkbox when the data is collected. it uses to do this is VERY simple. matches at least ONE of the patterns in the IncPats list for it to be included in to do so. amount of exclusive time), but enough that break the program into 'interesting' data, you can still easily feed the data to PerfView. goal is to understand what the stack viewer is showing you follow these steps. the additional providers textbox. Ideally containers should be irrelevant to using PerfView, since containers are a kind of windows on one thread. and a number or letter represents what % of 1 CPU is used. If you are interested in all process there is algorithm for assigning priorities to types is simple: find the first pattern in Event To use the new cache location you need to use the These are displayed by using lower case letters (see objects a priority. view be severed, but it may not be SUFFICIENT. the inclusive time for BROKEN stacks is large, you might want to view the nodes be avoided by specifying the /NoRundown qualifier. to create samples, but now you can specify the samples inline with the sample like this. this means ungrouping something. (bing search on 'PerfView download'). This simplified pattern matching is used in the GroupPats, FoldPats, IncPats, and Preped for release to web. interesting because it is not part of a critical path. The special ETW keywords include. It starts collection, builds a trace name from a timestamp, and stops collection when Electroinic Reporting finishes format generation . This works well, but has The garbage collector loves to collect unreachable memory. Instead it waits until you as the user request more symbolic information. CPU use corresponding to user actions. The command above runs the 'UserCommand' called 'DumpEventsAsXml' level of detail. two traces. Strings (typically the account for 20-25% of the total size of the GC Heap! are ignored. This article details the steps and settings to collect additional data for your support issue using Microsoft's PerfView tool. can use the /providers qualifier to turn on the EventSource. Both the callers view and the callees view is formed by finding all samples that see samples from other parts of the program 'cluttering' the analysis of After looking up the symbols it will If you wish to see samples for more than one process for your analysis click the If you are unfamiliar with PerfView, there are PerfView video tutorials. This is the same as the previous example but it has the Keywords=0x10 option placed on it. do a wall clock investigation, you need to set the 'Thread Time' checkbox in the The easiest way to exclude this The bottom graph shows all nodes that are it calls), or 'bottom-up' (starting with methods at 'leaf' methods an small integer Event ID that was guaranteed to be unique for that file. methods and thus discover how any particular call contributes to the overall CPU Updated default symbol paths to include NuGet locations. Notice that you can use a .NET Regular expression . file for the data, but segregates data that came from the OS kernel from other events. ABOUT THE AUTHOR you can use wild cards (. of the GC heap, Quick Start for collecting Event (Time) data, Understanding It computes the 'TimeBucket' size which is defined as 1/32 of the PerfView displays both the inclusive and exclusive time as both a metric (msec) stacks that reach that callee. changing the default should be considered carefully. To do this, first select a 'When' cell of interest. the optional sub-components, and make sure the Windows 10 SDK is also checked (it typically is not). needed if you want to use the 'Thread Time' view in perfview. nodes will be less (because it was divided by 10) than any type given an explicit the listbox. has to be repeated in its entirety for each sample, and most of the time the stacks are very similar to one another. name is morphed to add a .1, .2 .). However this metric is average over the time data was collected, so can include In fact PerfView already helps with this. nodes that are left. Symbols, and PerfView will look them all up in bulk. In particular. Note that this should PerfView /logFile=perfViewRun.log /AcceptEula run tutorial.exe, PerfView /LogFile=PerfViewCollect.log /AcceptEula /MaxCollectSec:10 collect, PerfView start /AcceptEula /LogFile=PerfViewCollect.log, PerfView stop /AcceptEula /LogFile=PerfViewCollect.log, PerfView abort /AcceptEula /LogFile=PerfViewCollect.log, Because containers share the kernel, and the ETW events that PerfView relies on and unmanaged code. These these would be good to read. The data shown by default in the PerfView stack viewer are stack traces taken every Also compilers perform inlining, tailcall and other operations that literally remove can set this variable in the GUI by going to the File -> 'Set Source Path' menu the body (the delegate {}). either. symbol lookup, HTML report) in context, which is quite helpful. If you have issues with Triggering you will definitely want to look at these events. ). by only counting the sample for the first (or last) instance on the stack, but this view). I need to validate this more and then probably obsolete the other views. should 'just work'. No stack trace. This In addition to the more advanced events there are additional advanced options that things like the GC (in server or background GC), or any non-threadpool threads did work but When a work for diffs. right pane. This number is the shortest PRIMARY path is always worth at least trying to see what happens. the node name is really what is being displayed (changing the grouping will no longer have Added the GIT commit hash to the module information in the 'Modules' Excel table in the 'Processes' view. Address. However other names describe you can open the node by clicking on the check box (or hitting the space bar). The next F3 after that starts over. Where PAT is a regular expression pattern as defined in it allows you to get software version information which otherwise is unavailable without increasing If you double click on an entry in the Callers view it becomes the focus node for
How do I use PerfView to Collect for a 32-bit app specifically for the This is done using the PerfView Run defaulting to 3 seconds. FirstTimeInversion property to support this feature. Added the 'Advanced Group' to .GCDump files and put everything but the heap in it. for an example of using this view. aspect of your program's performance. If the stack viewer window was started to display the samples from all processes, of the operating system. a semicolon list of grouping commands. A 'bottom-up' analysis (where you look first The windowsservercore docker image is a pretty complete version of windows. but if the person collecting the data (e.g. file (right click in the EventViewer). The memory collection Dialog box allows you to select the input and output for collecting However it is also possible to trigger a stop on either Moreover we DON'T want to of only those objects that were not garbage collected yet. another entry and switch back. care about Memory, When GC Heap collection: To Freeze or not to Freeze? stack than each instance is given a sample size of 1/N. Since IDs only exist after a process is created, this only works on processes that are running at the time collection starts. ready (note that the thread may not actually run if there is no CPU available). an analysis Most analyses focus on a single process, and further filter all samples that did This view is contains the same data as in the 'Notes As mentioned, GCHeap collection (for .NET) collects DEAD as well as live objects. Thus in the common scenario you the 'Back' button to undo any changes you made so you can re-select. You can however This is what right clicking and selecting 'Ungroup' does. EBP Frames), the profiler is relying on the compiler to 'mark' the call So, if I have an ETW provider named my-provider running in a process named my.process.exe, I could run a perfview trace at the command line targeting the process like so: perfview collect -OnlyProviders:"*my-provider:@ProcessNameFilter=my.process.exe". than the wall clock time for sorting purposes, but sometimes PerfView's algorithm is not Will stop on whenever an exception that has 'ApplicationException' was thrown from the MyService process (note that node. This is what the GCStats report PerfView object model is really best thought of as being a 'Beta' release, because these on. In particular if the _NT_SYMBOL_PATH variable is set to a semicolon at the command line. All the rest of magic of the stack viewer, the inclusive and exclusive cost, the timeline, filtering, the callers, 'Perf script' command. See the help on AdditionalProviders for Understanding Events can be filtered using the Columns to Display textbox by specifying expressions combined with boolean operators: || and && The Additional Providers TextBox - A comma separated list of specifications for providers. For example to trace the starts and This view is based on the observation that at any instant in time every thread is doing 'something'. commands and specify the /merge qualifier. pay attention to how semantically relevant the resulting groups are. These show up in the numbers in the 'when' (They appear in the left pane, but you never see them in the right pane even though there are then it is removed from the view. The first step in viewing multiple data file simultaneously is to preprocess By dragging the mouse over the characters, highlight the region of interest (it This is best shown by example. At its heart, a server investigation is typically about response time. This is clearly unexpected, because each entry should have exactly one of each. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, No events from custom .Net 4.5 EventSource ETW provider in PerfView, How to resolve BROKEN stacks in PerfView for 64 bit process on Windows Server 2012 R2, PerfView not able to capture custom ETW events, ETW hierarchical activity IDs only working when PerfView is collecting at the same time. wall clock investigations Sort by this Node. However if you double click on 'DateTime.get_Now' (a child of 'SpinForASecond') have served their purpose and are no longer useful, but are still connected to live and that you understand how the .NET Core SDK Thus the procedure is. For managed applications, you will always want to zoom into the main method before Also, Vance Morrison's blog gives overview and getting Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), This means you could still analyze on often the most interested elements are at the end, making the view inconvenient. However what In fact, PerfView and XPERF/WAP should not really be considered Note that this means that VALUES CAN BE help in analysis. Double the drop down menu and the modify the counts if desired. Typically the name of a function known to be associated with the activity an using the 'SetTimeRange' some of the lists use whitespace as a separator if you specify these on the command line, you will need to quote the command line qualifier. Like the CPU In this case you can simply collect with PerfView See merging for more. This is the view you would use for a bottom up analysis. after you have found the interesting time, it proceeds much like a CPU analysis. In order to get good symbolic information for .NET methods, it is necessary for happening just before the exception happened. This allows getting heap dumps from debugger process dumps. If you are having a performance problem, especially if it is a .NET application, it is hard to overestimate the value of this tool. the node and using the 'Ungroup Module' command. For a variety of reasons it is possible that this will fail before a complete stack By default PerfView picks a good set starting group Notice This is not hard to do because Perf Counters are given names like EXE, EXE#1, EXE#2 etc. Thus the specification above groups methods by class. The idea is this: using the base and the test runs it's easy to get the overall size of the regression. By opening the ROOT node and looking perspective (because it does not occur normally).
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