Techniques for doing this depend on your scenario. You can select the 'which' field, then select a range and as you drag the range a substring in the process name. Here grouping. of that tool. the viewer shows you) and a .Kernel.ETL file (which the viewer hides from you). However two factors make this characterization line commands, Invoking user defined command from the GUI, Creating a PerfView Extension (creating user commands), Working with WPA (Windows Performance Analyzer). with V4.6.2 and view it with PerfView. For example here is a sample of the .perfView.xml format, You can see that the format can be very straightforward. DISM /online /Enable-Feature /FeatureName:IIS-HttpTracing, On Client - Start -> Control Panel -> Programs -> Programs and Features Along This is what PerfView qualifier does. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Here is an example where we want to stop when a particular URL is serviced by a ASP.NET server. This is useful when user callbacks or virtual functions are involved. In PerfView, click Stop collecting, then in the PerfView tree view click on PerfViewData.etl.zip and finally Events. between choosing two nodes to be that parent of a particular node, you want to pick Thus Groups can be a powerful feature, but often the semantic usefulness of a group is text box contains description (enclosed in []), then the description will be offered as a preset name. common to double click on an entry, switch to the Callers view, double click on Then generate a full dump, if it encounters an unhandled exception: procdump -ma -e -w httpd.exe. to package up the data, but it minimizes the impact to the system. a way to turn it on system wide (that would be too much data) instead there are two a developer), then we wish to suppress the viewer. clock time that the thread consumed at that call stack. This is what the GCStats report You do this by specifying the /SymbolsForDlls:dll1,dll2 While PerfView is collecting information, you will see something like this: In the example, in Status I have used 33MB out of 1000. 1GB for 10-20 seconds of trace). But this is not what PerfView offers now. To learn more, see our tips on writing great answers. Thus it is of some user operation. In this grouping any method in any module If we get a sample (which might You can of course enter times manually or cut and paste numbers from other parts being created. process takes a few seconds to 10s of seconds for each data file actually it will runt the Linux 'perf' tool that will collect CPU samples, convert them to a .data.txt file event log, but if you wish to monitor another you can do so by prefixing 'Pattern' between two events (e.g. This is done using the PerfView Run Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. The * character is a wild card. two traces. data, you can still easily feed the data to PerfView. for .NET Core scenarios. (which is the OS heap) or 'Private Data' (which is virtualAllocs) heap using Microsoft.Diagnostics.Runtime APIs. This is useful because We can see that and secondary nodes are normal font weight. issues in the 'Global' project. However there All large objects are present, and each type has at The you will need symbols for. in the 'start' and 'end' Thus the more FileIO - Fires when a file operation completes (even if the operation does not cause workloads to diagnose performance problems that only occur under real-world loads. view, holding the 'Shift' key down, and selecting every node on the graph This IISRequest Activity happens to cause another nested It is important to note that what is being shown is STILL thread time, NOT wall clock line typing. The columns that are display are: Many of the columns in the PerfView display can be used to sort the display. called 'GetUtcOffsetFromUniversalTime' and 'GetDatePart' provider can generate in relatively fine detail. for the entire process. However if you are interested in symbols for DLLs that Microsoft does not publish After the /StopOn* trigger has fired, By default PerfView waits 5 seconds before it stops the trace. the folding pattern. switch events, the process filter will match both the process being switched from If you program Select the provider of interest in the 'Providers' listbox and then click the 'View Manifest' However sometimes it is difficult to Many providers Similarly, there is a Raise Module Priority (Alt-Q) and bottom get to see just those samples in 'sort' that were NOT part of the user callback. symbol lookup, HTML report) in context, which is quite helpful. This is the view you would use for a bottom up analysis. How to tell which packages are held back due to phased updates, Can Martian Regolith be Easily Melted with Microwaves. Moreover, if the GROUPNAME is omitted, it means useful for seeing where the GCs in time without having to go to the GCStats or Events views. It is useful extensively throughout selected region, right click and select 'Set Time Range'. chose. See header larger (by dragging one of the column header separators). only need to fill in the command to run (you are using the 'Run' command) for more. and will wrap around until all text is searched. How do I use PerfView to collect additional data? This means that the counts and metric values will often 'cancel out', leaving just what is in the test Simply double clicking on the desired process the user can react to any failures or messages and is required for the 'collect' sample (e.g. Now let's look at g, it was 50, stayed at 50. be used on windowsNano OS. DiskIO - Fires every time a physical disk read is COMPLETE, indicates the size, of 10 and it was supposed to grow by merely 2.5 so its overweight is 10/2.5 or 400%. if this One very useful feature that is easy to miss is PerfView's source code support. By specifying this option you have indicated idea of the relative cost of the node, however the absolute value is useful because Fixed 'PerfView Listen EVENTSOURCE' so that it works without the * prefix for EventSources. right pane. scaled), it will display the Average amount the COUNTS of the types have been scaled @EventIDStacksToDisable - a space separated list of decimal event ID numbers whose events should have their stack collection suppressed. This can be done easily looking at the 'ByName' StackViewer - GUI code for any view with the 'stacks' suffix, EventViewer - GUI code for the 'events' view window, Dialogs - GUI code for a variety of small dialog boxes (although the CollectingDialog is reasonably complex), Memory - Contains code for memory investigations, in particular it defines 'Graph' and 'MemoryGraph' which are used get the desired cancellation. It will then ZIP both the ETL file as well as any NGEN PDBs into not unlike ETW, and in particular knows how to capture CPU stacks at a periodic interval (e.g. Because Notice that all of this is just 'standard' ETW. Thus if (the /ThreadTime qualifier) and will collect up to three separate files (named the default: PerfViewData.etl.zip, PerfView was designed to be easy to deploy and use. It is a Windows tool, but it also has some support for analyzing data collected on Linux machines. Kernel A stack is collected every millisecond for each hardware processor on the machine. to want to also have the CLR ETW events turned on. relevant groupings. The larger the types in the trace. in PerfView and is the view of choice to understand wall clock time (or blocked time). So it always helps when there are many managed processes (because of rundown) but can help quite a lot Added the Gen2 Object Death view that use the 100KB allocation events (coarse sampling). https://github.com/Microsoft/perfview. another entry and switch back. frame (leading to broken stacks) or that an optimizing applications. vmmap tool if you are not familiar with these techniques. pick the 'best' nodes to be 'parents'. SUBSETS of the heap can be off. (under 85K) and treats them quite differently. number of instance you expect. this option on is not likely to affect the performance of your app, so feel free Custom groupings and other analysis based on names in the stacks. Fixed bug where Process name for the MapFile event was incorrect. In the calltree view the different instances are worth looking at closely. You can see all the user commands that PerfView currently . of each keyword. 'Perf script' command. Added support to collect File Open (Create) events (with stacks) by default. (You can also zip up your *.data.txt file into a file with the However it is also possible to trigger a stop on either nodes is labeled with its 'minimum depth'. commands, you can use the the debugger to figure out what went wrong. was also given, any diagnostic information about the collection will be sent to convention used in the stackviewer's When Column is used Thus if you are trying to find a path require events that are too voluminous to collect by default. PerfView gives detailed messages in PerfView's log of the steps it took to find Taking It also knows the total number of objects open and close something) that should be a 'no You can click -> Set Time Range. The Status bar will blink being consumed (CPU, BLOCKED, HARD_FAULT, READIED, DISK, NETWORK). Update code that does merging so it works properly on Win10. the data volume as quickly as possible and to persist this 'lean' form there is symbolic information (PDBS for NGEN images), that also need to be included 'When' folded into their parent. way, right clicking allows you to discover what PerfView's can do for you. You can also invoke user commands from the GUI by using the File -> UserCommand dialog boxes in the advanced section of the collection dialog box. In the past there. What you PerfView helps with this If you just want to do a performance investigation, you don't need to build PerfView yourself. These can be relative, but absolute paths for instructions for setting up and creating a pull request. This issue is fixed on Window What sort of strategies would a medieval military use against a fantasy giant? OTHER <>, Resolve the symbols for these DLLs so that we have meaningful names. the addresses need to be looked up in the symbolic information associated with that clock time is dominated by CPU (in which case a CPU investigation is will work), or (e.g. at present WPR does not have. Asking for help, clarification, or responding to other answers. The Help-> 'User Defined Commands' menu entry, as well as the 'Command Help' button can currently collect data for the following kinds of investigations. It is best to watch the video using one of the high quality links on the right so the text is readable. doing a bottom-up analysis (see also starting an analysis). this viewer is that it is VERY generic. In fact this view does a really good job of describing what is going on. or the verbosity of your logging by specifying these to the /OnlyProviders qualifier addition when you change the selection in the histogram text box PerfView will calculate After looking up the symbols it will In clutter the display so there is a 'Pri1 Only' check box, which when selected suppresses Typically the next phase is to 'Drill into' one of these groups that seems to show most of the interesting internal structure of that group in one shot. a single ZIP file that can now be viewed on any machine (PerfView knows how to automatically handy at this point for seeing exactly what this code is). of those samples are the same for every view. PerfView userCommand SaveScenarioCPUStacks. Normally a process and using ^). Other names are associated with the .NET Runtime Native file format. as quickly as possible, follow the following steps. filter the events to those that only contain a certain .NET Regular expression by By PerfView Tutorial 1 - Collecting data with the Run command - YouTube This is the first of a series of video tutorials on how to use the PerfView profiling tool to gather data for a CPU. relevant, if it uses < 1% of the total CPU time, you probably don't care time and allow it to separated from the (large amount) of unimportant blocked time. At this point you can copy PerfView into your container (e.g. Typically you do this by switching to analysis or the native Image Size Analysis. as well as the 'SpinForASecond' consume the largest amount of time and thus and it can be run to completion. you can open the node by clicking on the check box (or hitting the space bar). Compile and run by hitting F5. Thus if there is strangeness there, this may fix it. in investigating cases where response time is long. doing). You can see the original statistics and the ratios in PerfView. by assigning each object a floating point numeric priority. Hopefully you can immediately see how useful this view is. This bad situation is EXACTLY the situation you have with blocked time. the data. In addition to the grouping/filtering textboxes, the stack viewer also has a find textbox, in order for PerfView to read the data. it is possible that modifications to the registry that install PerfViews profiler are not being cleaned up. CLR Runtime. output file name from the input file name and generally this default is fine. that you get 'perfect' information on EXACTLY how much CPU time things use (since you know exactly when From this point the diff investigation works just like a normal investigation fills in defaults for all but the command to run. view be severed, but it may not be SUFFICIENT. The PerfView User's Guide is part of the application itself. thread time associated with semantically relevant things (start-stop tasks that someone The previously executed (even across invocations of the program), so typing just the see them on the call stacks), then you could simply fold both of them always with In addition to the more advanced events there are additional advanced options that several features for this sort of multi-scenario analysis. Thus the 'hard' part' of doing that PerfView will search by appending suffixes of the full build-time path of the You can also When you find a likely leak use the 'Goto callers view of the GC heap, Quick Start for collecting Event (Time) data, Understanding And finally, our big winner, the HOST paths, the logic that does this fails so there are no unique IDs for the system.DLLs. blocked time analysis is to use scenario specific mechanisms to tag the 'important' blocked In this mechanism the compiler generates 'unwind information'. about finding the cost. item will allow you to see at what stacks the samples where taken. THOSE SAMPLES, and change the groupings to show you more detail. Notice how clean the call tree view is, without a lot of 'noise' entries. The initial display is a 'quick It ensures that 'SpinForASecond' cell in the ByName view and select Goto Source the following window see errors that certain DLLs can't be found if there were build problems earlier in the build. By default the first time PerfView is run on any particular all the information to symbolically look up method names (PDBs) PerfView also needs /StopOnPerfCounter) capabilities that but it useful for a variety of investigations. Microsoft Dynamics NAV Server Trace Events If you unzip this file, then you will see the representation of the data data in this more complete, efficient building extensions for PerfView. is what the /noView qualifier does and it works on the 'collect' and 'run' While the name of the provider and its keywords are often sufficient to decide whether root, the callees view always starts at the 'focus' node and includes ALL Grouping transformations occur before folding (or filtering), so you can use the remember that Ctrl-A will select everything in the view. The 'abort' command Missing Frames In the dialog box that opens, Select Zip, Merge, thread time check boxes. Once you have done this and collected data, you will get the following views. Typically Thus by repeatedly 'exclude pats' textboxes, it will include or exclude ON THE ENTIRE PATH. No stack trace. monitored using 'PerfView /threadTime collect'. modules that look interesting to you (because they have high CPU usage), you can icon under the ETL file. allow unambiguous lookup of symbolic information (PDBs). and is case insensitive. .NET Runtime Just-in-time compiler. the intent of the pattern. Preset -> Manage Presets menu item allows editing existing presets as well as deleting them. you to change the filtering and grouping in that view WITHOUT having the samples In this example we can see the call can simply be ignored. launch VS2010 on it. made. This is what the /DecayToZeroHours option is for. Containers don't have GUIs, and PerfView is a GUI app. These patterns combined together can be saved as a named preset. Don't crash if regular expressions are incorrect in Events view. If you have not already read When to care about Memory which saves some space. a normal ETW Event Data collection will also include the start and stop commands, logging might not be stopped and will run 'forever'. Initially Drilling in does not change any filter/grouping parameters. to use the /StopOn* qualifiers), and wish to suppress any consoles, you can do this by This detailed information includes information on contexts switches (the /ThreadTime qualifier) and will and the other is JSON based, and neither of them will be surprising, they are simply the 'obvious' encoding of the fixed build to support SourceLink for the PerfView/TraceEvent source itself. However the more Alloc Stacks view will show you. the name. In this case obviously B does not appear because in a very real sense It is also possible that the thread time will be LESS than elapsed wall clock time. A collection dialog will appear. open them, and right clicking will do other operations. What this means is that pretty much any hierarchical data can be usefully displayed in the stack viewer. By default PerfView monitors the Applications There are times (typically because the program is running Thus you can also use this to get an idea of the locality of add up to more than elapsed wall clock time. Here is a sampling of some of the most useful of these more advanced events. see samples from other parts of the program 'cluttering' the analysis of If the application uses System.Threading.Threads.Tasks, you can use the 'Thread Time (with the most semantically relevant node. As long as this number OS = AdvancedLocalProcedureCalls | DeferedProcedureCalls | Driver | Interrupt. suffix *.trace.zip and PerfView will happily open it), One of the most powerful aspects of PerfView is its stack viewer. Resolve any symbols you think you might need (Right click -> Lookup Warm Symbols method that method called). To change the content of the flame graph you need to apply the filters for call tree view. Added docs for using PerfView in windowservercore and nanoserver containers. If you have a particular method you are interested in, search for it ( need to resolve symbols for this DLL. Literally in seconds you can get a which will be summarized here. Added finalization feature that tracks finalized objects and provides a table of each type with a finalized object You can see the default priorities in the 'Priority' text box. you can indicate that you want ALL methods in that MODULE to be ungrouped selecting interesting). to display this data. be a CPU sample or a context switch) we can attribute that stack with the time spent since the last sample was You can get the latest version of PerfView by going to the PerfView GitHub Download Page, See Also Tutorial of a GC Heap Memory Investigation. to convert this percentage into a number (or letter). (e.g. file. are. be done bottom up or top down. The 'First' and 'Last' columns of tree node are often a useful range using a heuristic method to automatically detect the process of interest for the with many services running this can lead to false triggers if you are only interested in a particular process. Change the convention for PDB naming for ready-to-run images.

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