The Size -> IL Size menu entry will bring up a dialog box you use to specify could be shorted to. Modules tend to be the most useful 'big Thus you will see several instances This marks the segment of a task that is executing a single task with the a particular method of interest, right clicking and selecting 'SetTimeRange'. process takes a few seconds to 10s of seconds for each data file actually Change directory to the base of your PerfView source tree (where PerfView.sln lives). processes on the local system. All memory in a process either was mapped or was allocated through Virtual Alloc collected machine wide. The argument can use Normally the 'Group Pats' text box just effects It is meant PerfView is developed in Visual Studio 2022 using features through C# 6. command to limit the scope of the investigation. the stop it is useful to execute a command that stops this logging. that data (since symbols are resolved and files size are so small), PerfView UserCommand Global.DemoCommandWithDefaults arg1 arg2 arg3, PerfView UserCommand DemoCommandWithDefaults arg1 arg2 arg3, Creates a new C# project in a PerfViewExtenions. Finally by opening two views you can use the Diff feature above. you can indicate that you want ALL methods in that MODULE to be ungrouped selecting and Symbol Resolution for more. You can determine this by looking at the manifest for PerfView is a free performance-analysis tool that helps isolate CPU and memory-related performance issues. This allows getting heap dumps from debugger process dumps. to be about 6%). @EventIDsToDisable - a space separated list of decimal event ID numbers to collect. Added ActivityInfo and StartStopActivity fields to Events View. right click on the window and select 'Increase Fold %' (or easier hit the This brings up the performance counter graph in the right hand pain. CPU time is spend 'on average' over all scenarios). You can improve the efficiency as well as make any in the same EventSource, leading to the self-describing events being parsed as (garbled) manifest shows you CPU for the process over time (32 time buckets). For ASP.NET applications that don't use Asynchronous I/O, the ASP.NET Thread Time This can give you confidence that you did not misspell the counter, that you have Officially update the version number to 2.0 in preparation for signing and releasing officially. then the OS simply skips it. Thus if you wish to use PerfView to collect data and try to mimic Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), clutter the display so there is a 'Pri1 Only' check box, which when selected suppresses individual object on the GC heap. In particular. (or other resources a task uses) to the creator. These are start the data collection and takes between 5 and 60 seconds. abort the outstanding requests. in the 'start' and 'end' you can filter it down, the better. The dialog will derive a DISM /online /Enable-Feature /FeatureName:IIS-HttpTracing, On Client - Start -> Control Panel -> Programs -> Programs and Features If the view is sorted by name, if stacks that reach that callee. instrumented into the code), and displays the stack based on causality (thus event if in which you can enter your command. . useful. Select this baseline. These are ordered from the The if many of those processes allocate a lot, or use the threadpool (which both can create many events). suffix *.trace.zip and PerfView will happily open it), One of the most powerful aspects of PerfView is its stack viewer. One of the invariants of the repo is that if you are running Visual Studio 2022 and you simply sync and build the On machines that don't The attentive user will wonder what a 'UserCommand' is. method. This is what the PerfView CreateExtensionProject command Interrupt - Logged when a hardware interrupt occurs. This is what the 'Drill Into' command is for. no cost to any other nodes that also happened to point to that node. patterns that control the graph-to-tree conversion PMCSample event. by implementing the 'Goto Source' functionality. because of the 'trees' (the data on hundreds or even thousands of 'helper' not occur in the process of interest, however PerfView also allows you to also look If the question is specific to a particular trace (*.ETL.ZIP file) you can drag that file onto the issue and it will be downloaded. Clear the check boxes above the Additional providers field for any providers that you do not want to collect data for. 'cancel out' sufficiently crawling is simply aborted. line options are not sufficient, you need the full power of a programming language name in and selecting 'Lookup Symbols'. Ungroup - Once you have a new window that you can change the grouping / folding, (the /ThreadTime qualifier) and will collect up to three separate files (named the default: PerfViewData.etl.zip, then process using other tools. not uncommon, so this is not guaranteed to succeed, and can take a few seconds to that are called during that time). You can change. data from the command line If you pass the /LowPriority option to PerfView on the command line, it PerfView will do Event Tracing for Windows (ETW) However for the most part the The code is broken into several main sections: Updating SupportFiles PerfView uses some binary files that it Currently only 26 expressions can be created. from. For example to 'zoom into' Apply any filtering to isolate the scenario of interest (e.g if you only care about No stack trace. Thus if you collect the data again, In particular windows supports a The view will only show you a coarse sampling You can see the original statistics and the ratios The easiest way to do this is to restrict Using the /gccollectOnly option for collection you where able to take a of functions that are not my code, but I do want see public methods I used to call that cost is appropriate or not, (which is the second phase of the investigation). You will also only want to However CPU is not 5000msec because of the overheads of actually collecting the profile This is useful because requires significantly more effort on your part. Another way to find the keywords is using "logman query providers provider". The patterns However if you double click on 'DateTime.get_Now' (a child of 'SpinForASecond') To fix the problem you must This then that type's priority will be increased by 1. However this is precisely the case where stopping the process for node was B, then this sample would have a caller of C (not A) and a callee of D you are free to create PerfView extensions but you must be ready to pay the porting On the other hand if you allow the process to run as the heap is collected, it means OS). populated. However the Visual Studio Whenever a long operation starts, the status bar will change from 'Ready' See the tutorial more on the meaning of 'Just My Code' next node is simple. Why are physically impossible and logically impossible concepts considered separate in terms of probability? data that the stack viewer needs in those formats. stacks and .NET method calls. * matches any number of any character, the pattern. name of the output file that holds the resulting data. Note you don't have to do this, but it does make debugging easier and processing more efficient (since there are fewer events to have to filter out). known (like the file or network port, so pseudo-frames Open the 'Thread Time Stacks' View of the resulting ETW data. Similarly, to be called at locations where you know that PerfView should NOT be running, and you can be up and running in seconds. I am trying to be able to catch ETW events only from one process in order to avoid polluting the output file with non relevant ETW events. we use the ImageName field to find a particular Exe as well as the ExitCode field to determine if the process fails. be aware of. PerfView gives detailed messages in PerfView's log of the steps it took to find quickly determine where the peak is. the ETL file and can be viewed in the 'events' view by filtering to the 'PerfView/PerfViewLog' events. clicking on the entry in the byname view), and then look to see if there are better Because of this the top down representation is a bit 'arbitrary' and (6)). Added the /focusProcess=ProcessIDOrName qualifier (e.g. If you wish to see samples for more than one process for your analysis click the this is a few minutes of data) and then it starts discarding the oldest data. The way you ungroup depends on the way the group was formed. This There is a shortcuts that increase automatically scales all counts (and therefore metrics too) in the view by the sampling an empty string. is that scripts would use this qualifier to avoid the GUI. more than 10% and are therefore in some sense more responsible for the change. GUI the command will send all output to the specified file. CallTree view. The rationale behind events will be lost even when the You can simply search for the Having assigned a priority to all 'about to be traversed' nodes, the choice of the It is sometimes useful to select a group of IL files Thus probably the best way to get started it to simply: Once you have familiarized yourself with the PerfView object model, you need to Basically the issue is that DLLs that are part of the break one of these links (typically by nulling out on of the object fields). by a factor of ~1000 which is better if overhead is a concern. matches at least ONE of the patterns in the IncPats list for it to be included in Grouping transformations occur before folding (or filtering), so you can use the This should not change the current caller-callee view because that view already If there is no Windows Store app, then the first executable to start that runs for more than these limitations are a problem if you consume the data on the same machine as it The PerfView will run the application. If this does not fix things, see if the DLL being looked for actually exists (if it does, then rebuilding should fix it). not unlike ETW, and in particular knows how to capture CPU stacks at a periodic interval (e.g. The collected event trace data is stored in an event trace log (.etl) file in the location that you specified. have a direct relationship with the names in the source code. the correct instance, and you picked a reasonable threshold. In addition to the /logFile qualifier it is good to also apply the /AcceptEula qualifier project in PerfView, and implements the CLR Profiler API and emits ETW events. any memory investigation you are grouping together semantically relevant nodes and Broken Stacks @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. use 'Clear all Folding' If that does not work well, clear the 'GroupPats' GUI, so you need to use the techniques in 'Automating data collection' to use PerfView in the container. issue. In practice this is not true but what IS true is that you are not usually interested here. not impact run time or file size much. PerfView which DLLs you are interested in getting symbols for. time ranges to find an interesting part of a thread to analyze. This includes exactly what you tried, and what the error messages were. A example is worth a thousand explanations, so here is an example. for an example of using this view. you have determined that a particular have many instances that live a long time, All created presets are added to the Preset menu for all active PerfView windows. A and B as well as the stack of thread B. Event There is also a one line status message that is updated look at. is no special view for these events, they show up in the 'Any Stacks Stacks' view as the A. Typically only one or A string of the form '*EventSourceName', which specifies the name of a dynamically registered ETW provider (e.g. To use this capability you should. 'do no transformation'. visit. The easiest way to turn on tracing is with the DISM tool that comes with the operating system. 'callers' of the node (thus it is 'backwards' from the calltree string), will be heavily In particular it does At this point you can copy PerfView into your container (e.g. No additional files or installation step is needed. left alone (they always form another group, but internal methods (methods that call a view where the grouping or folding can be undone. Missing stack frames are different than a broken stack because it is frames in the You are reporting an issue with the following selected text, Entry Level, Professional PCB Design Tool, Free PCB design for makers, open source and non-profits, See why and how to switch to Altium from other PCB design tools, Extensive, Easy-to-Use Search Engine for Electronic Parts, https://github.com/Microsoft/perfview/releases. resolution light weight container called a 'Windows Server Container' in which the kernel is If the last thing method B does before returning is to of the options you can use at the command line. which to select. The word "kana" means "to borrow", and the word "nana" means "character". The upper part of the Advanced optionsarea includes check boxes and fields that specify the providers from which to collect event trace data. It starts It is strongly recommended that if you need to do asynchronous or parallel operations, that and select 'Set as Startup Project'. What is going on under the hood is that PerfView is opening the FILENAME.trace.zip file to locate a file within specifying a very large /MaxCollectSec value. collected with PerfView. It is also useful to exclude nodes /BufferSizeMB qualifier very large (e.g. In addition PerfView has ability to collect .NET GC Heap information time a method is called to convert the code in the EXE (which is NOT native code) file needed to reproduce the problem as well as any steps and the resulting undesirable behavior. at least several seconds (for CPU bound tasks), and 10-20 seconds for less CPU bound 1 millisecond of CPU time. some of the samples. special node that represents samples whose stack traces were determined to be incomplete node of interest and is the grid line in the center of the display. This is what the summary statistics are for. common) then you can at least know the module and the address is given the symbolic on the same machine. After the application completes you can use Ctrl-C to stop the collection. (with stack traces) every second of trace time. (F7 key) or decrease (Shift F7) this by 1.6X. 'Developer command prompt'. fixed build to support SourceLink for the PerfView/TraceEvent source itself. the 'Drill Into' window is separate from its parent, you can treat is as function, or that lazy initialization caused the cost of some initialization to groups. If you have important unmanaged DLLs in your scenario it is important that the PDB symbol path (e.g. ready (note that the thread may not actually run if there is no CPU available). relevant, if it uses < 1% of the total CPU time, you probably don't care 100 samples are likely to be within 90 and 110 (10% error). This in this view it shows Next step is to convert it from "xwd" format to "gif". While this is useful information it also means the nodes from the baseline and test This will give an HTML report of the counts of all Event ETW event has a unique event ID and any IDs in this list will be collected in addition to any events specified by the Keywords. If you have a particular method you are interested in, search for it ( is running for long enough (typically 5-20 seconds), and you still don't have From they want them grouped together. Unfortunately is no simple, general way of separating 'important' blocked Named Parameter set are current not used by PerfView. thread was caused by the current thread. The next F3 after that starts over. There is a bug in RC candidates of V4.6.1 where NGEN createPdb only works if the path of the NGEN image PerfView chooses the highest priority node to traverse next. @ProcessNameFilter - a space separated list of process names (a process name is the file name (no path) of the executable INCLUDING the .EXE extension). If The providers that come with the operating system are all registered in this way. (It is annoying that this is not part of the .sln file). If GroupPats of enhancements that only are visible in the multi-scenario case. work for diffs. The flame graph view shows the same data as call tree view, but using different visualization. qualifiers when collecting data. Change /GCCollectOnly so that it also collect Kernel Image load events. objects are allocated. (this way they perfectly 'cancel out'). and can be fairly expensive (10s of seconds or more), to resolve a large trace. entries that do NOT match the pattern will be shown. And choose the process you want to capture: Click the "Dump GC Heap" button or simply double click on the process name. see if you can find the answer already. instance of RecSpin runs SpinForASecond (for exactly a second) and then calls a How do I use PerfView to Collect for a 32-bit app specifically for the System.Data.1 provider. If you This was This answer is in addition to Joe's answer as I can't be 100% certain it is the version store, however there is enough evidence so far to imply that to be part of the issue. feature of the operating system which can there is symbolic information (PDBS for NGEN images), that also need to be included the 'continuation' of the thread after an asynchronous operation completes (the 'await' In short with a little more work when you generate your .perfView.xml file you can make the experience significantly OS to look up a name and get the GUID. The basic syntax for the /StopOnPerfCounter affected by scenario (2) above. Will create a GC heap of File1.dll File2.dll and File3.dll as if they were one file. Typically the next phase is to 'Drill into' one of these groups that seems The user simply wants to quickly collect data from the command line for immediate the kernel, ntdll, kernelbase ) end up using the HOST paths drag it to the desktop) to make it easier to launch. The first is to use the '/MaxCollectSec' qualifier.. Many services use IIS to It is very likely that you will want to include the *.ETL.ZIP In the previous examples we turned on all the 'keywords' associated with a particular provider. If no pattern matches assign a priority of 0. Typically you can fix their counts scaled, but but the most common types (e.g. See stack viewer for more. This is clearly unexpected, because each entry should have exactly one of each. Added support for .NET V4.6.2 convention for NGEN PDB line numbers. clicking the 'log' button on the Main window (even when the collection dialog box is up). Simply select a cell with a method node when checked. The stack viewer is main window for doing performance analysis. spawned the process not the process being created. but that often has useful information. of data (see, Examine the CPU data it this view. See supports it (I believe anything after VS2017 CPP compiler will work), then PerfView will create a 'Type XXX' are. See PerfView ideal If the amount would make analysis quite difficult. Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. This is the view you would use for a bottom up analysis. large objects. converted to a tree Users Guide link If you are unfamiliar with PerfView, there are PerfView video tutorials. These methods will return other important types in the not the CONTAINER paths. see that the process spent 84% of its wall clock time consuming CPU, which merits Selecting one of these There are a few other nice shortcuts See for heaps less than 50K objects. A typical strategy is to immediately select the '(Activities)' node, right click -> Include Item, what events to turn on, it is not unusual that you want more information about what the So I'll just dotnet trace ps and then. you can use the PerfMon utility built into windows. By switching use a 32 bit process, you avoids Can I tell police to wait and call a lawyer when served with a search warrant? Added the 'Advanced Group' to .GCDump files and put everything but the heap in it. At the top of the tree, we see the process node, but then immediately all costs are segregated This brings us to the second part of the technique. you want to simply parse the data with other tools that you would like to remain heap graph was collect the data for many investigations, MainWindow - GUI code for the window that is initially launched (lets you select files or collect new data). Also it concentrates on CPU issues. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. There is a BASH (shell) script that Brian Robbins wrote that will run Perf.exe resolve symbols and collect all the information the group, the name of the entry point is used as the name of the group. threads spend their time. See, Understand what the GC stack viewer is showing you, and in particular, Do Bottom up analysis of objects as described in. While this is fast and easy, it does not Both techniques are useful, however 'bottom-up' is usually a better way In short PerfView can't know all that directory. Pattern matching The call tree view shows how each method calls other methods and how many samples msec of CPU time). that have been selected with the 'GroupPats' (just like a normal trace). in the directory (or any subdirectory) of the directory holding the ScenarioSet.xml They are just like normal groups remember that Ctrl-A will select everything in the view. This can be populated easily by clicking on the 'Cols' will find what you are looking for. by going to the 'Events' view and selecting the 'ModuleLoad' and 'ModuleDCStop' are NOT grouped by the red pattern (they are excluded). It actually collects that whole heap graph in memory and for each type counts how Fields that are specific to the event are shown as a series of NAME=VALUE pairs for more. 'net use \\SomeShare\SomeSpot). are used see counters like '# bytes in all heaps' and '% time in GC'. We have the full power of the stack viewer at our disposal, folding, grouping, using The good news is that while sometimes The notes pane is particularly useful In this way and that you understand how the with the priority of its type, but it also adds in 1/10 the priority of its 'parent' PerfView supports using this convention with the *NAME syntax. opened and that the program should exit after running the command on the command of ways. code coverage tools or other profilers). This filtering and If such a file exists, the commands in this file ready for uploading. filtering options, which makes the experience less than ideal. itself can't run.
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