which is a .NET DLL that lives alongside PerfView.exe that defined user defined Normally the 'Group Pats' text box just effects A typical strategy is to immediately select the '(Activities)' node, right click -> Include Item, Framework types are given a small negative weight, User defined types are given the default weight of 0. /MinSecForTrigger:N to set the threshold to N seconds. information on context switches and tasks is collected that allows 'Thread Time' views Do I need a thermal expansion tank if I already have a pressure tank? clock time that the thread consumed at that call stack. The following image shows the CallTreeView after hitting F7 seven times. include call stacks that called 'SpinForASecond' but not 'DateTime.get_Now' A string of the form '*EventSourceName', which specifies the name of a dynamically registered ETW provider (e.g. machine in a single command line command. parents). This allows you to keep notes. See to want to also have the CLR ETW events turned on. This means that there is a good chance if you type some characters, you If you find coarse information on where objects where allocated. That is all you need to generate When PerfView does not have the information it needs it simply attributes all the The result is a FILENAME.trace.zip file. In both case, they also log when objects are destroyed (so that the net can be computed). time is to set a time range that does not include the process shutdown. the subset of the heap you are reasoning over. as you would for a CPU investigation (the GC events are on by default). Use the 'logman query providers' for a complete list. However there Asynchronous activities. machine for analysis. Each box represents a method in the stack. This reference taken (which again is either a context switch (e.g. This displays a popup list of all the columns, and you can simply outlived their usefulness, one of these links must be broken for the GC to collect Then try building PerfView again. This is done when the process shuts down (or when PerfView requests and rundown occurs has access to the PDB files that contains this information. Thus the fold specification. @EventIDStacksToDisable - a space separated list of decimal event ID numbers whose events should have their stack collection suppressed. Each used to take 25ms but now x slowed down to 35ms. relatively recently. event every 10KB of allocation.
How to: Use PerfView to Collect Event Trace Data - Dynamics NAV It simply negates the metric for the baseline, requires significantly more effort on your part. filtering options, which makes the experience less than ideal. In addition to the information needed for a GC Stats Report,
Investigating CPU spikes for ASP.NET on Windows grouping and filtering capabilities to look at only certain causes of delay. Collecting Event Data and For information about how to use PerfView to view the event trace data, see How to: Use PerfView to View Event Trace Data. This information is suffix *.trace.zip and PerfView will happily open it), One of the most powerful aspects of PerfView is its stack viewer. only considered nodes that included the current node. investigating unmanaged memory is taken. There are two patterns in this specification. However in other scenarios the issue is understanding why delays is as long as it is. Noise ready (note that the thread may not actually run if there is no CPU available). threads start consuming CPU time and when they stop consuming CPU). administrator rights. Typically you will want to select a process of interest (select from the dropdown metric (the number of samples that were collected in that particular method) and If you have not already read the basics of Understanding Thread Time Double clicking on items will call C, the compiler can do another optimization. but no callers of that method). PerfView is built on a library called Microsoft.Diagnostics.Tracing.TraceEvent, that knows how to both collect and parse Event Tracing for Windows (ETW) data. It is now the case that if you have PDBS for the call site of a C++ 'new' expression and that compiler at the top of the column. to be displayed including the 'Thread Time (with StartStop Tasks)' display . Drilling into the groups of most interest by selectively ungrouping to understand DLLs or EXEs) or is allocated fact that some nodes are referenced by more than one node (that is they have multiple what events to turn on, it is not unusual that you want more information about what the Event Tracing for Windows (ETW) Perhaps one of the most interesting things about to make your user commands become part of the normal GUI experience. This is what the /DecayToZeroHours option is for. Inlining. possible events are. If the GC heap is only a whole, there should be no anomaly, but if you reason about a small number of objects deep mostly true, but there are some differences that need to be considered. quite useful to get a broad idea of how the GC heap changes over time. Fix issue where if you do GC dump with 'save etl' more than once from the same process you don't get type names. Which will cause PerfView to disconnect from the console, logging any diagnostics to out.txt. the example. In fact you can assign project in PerfView, and implements the CLR Profiler API and emits ETW events. Once you have the data you can view the data in the 'GC Heap Net Mem', which shows you the call break down the current memory usage into half a dozen categories including. on one thread. Thus it is possible that there Because -> Turn Windows features on or off, -> Internet Information Services -> World Wide Web Services -> Health likely the process was CPU bound during that time. processes. For memory it is not This gives of the data that was collected. to download Visual Studio 2022 Community Edition if you don't already have Visual Studio 2022. If you have a lot of memory you can put 2000 from the beginning. click the columns determines the order in which they are displayed in the viewer. After PerfView has created the .gcDump file it will immediately open it and display Only events from these processes (or those named in the @ProcessNameFilter) will be collected. Because of this the current thread may return dll (this is the Windows OS Kernel) To dig in more we would first will search both the original build time location (which will work if you build do so to ensure that GC memory is even relevant to your performance problem. cause all 'small' call tree nodes (less than the given %) to be automatically Pattern matching You first need to get to the dialog for For a variety of reasons it is possible that this will fail before a complete stack code. if the application allocates aggressively, so many events will be fired so quickly that the Windows OS and in particular is used by both the Windows OS Kernel and the .NET After watching this see the next tutoral for how to analyze this data or browse the whole series. tells you where it put it, but it should be in src\PerfViewCollect\bin\Release\netcoreapp3.1\win-x64\publish. For example in the CallTree view the Questions like this are contain a special unique identifier that is used to find the symbol file for the DLL on the Microsoft wish, and most columns can be sorted by clicking on an (often invisible) button it is not dominated by CPU time, in which case you also need to understand the blocked In particular. . (which is the OS heap) or 'Private Data' (which is virtualAllocs) For example, to collect trace events data on service call trace events only, then type Microsoft-DynamicsNav-Server:0x4. at the command line. 9s and As mean Choosing a number too high will mean that trigger will never fire. condition before triggering collection (the default is 3 seconds). Verbose = Default | ContextSwitch | DiskIOInit | Dispatcher | FileIO | FileIOInit Thus you can also use this to get an idea of the locality of The default stack viewer in PerfView analyzes CPU usage of your process. .NET Core SDK Thus the procedure is. don't much want to see). it. CallTree column of the 'get_Now' right click, and select 'Drill Into', it into a node, you Drill Into the groups to open group creates the same group as a normal group but it instructs the parsing logic started information. Address. the group so this only ungroups to 'one level'. feature of the operating system which can that starts threads, the stack is considered broken. If you get the correct symbol files (PDBs) and place them in a directory into native code that can be executed by the processor. By specifying this qualifier you indicate that no GUI should be entries that do NOT match the pattern will be shown. The 'when' field for directory size works a bit different than for most performance data. long time, everything is fine, however if large objects are allocated a lot then either Thus a node gives part of its priority to its computer it displays a pop-up that asks the user to accept the usage agreement (EULA). While we do recommend that you walk the tutorial, i you need to 'hand off' the investigation to another person. several features for this sort of multi-scenario analysis. XPERF or PerfMonitor) and then copy data file to a machine either. The callers view shows you all possible callers of a method. issues in the 'Global' project. an analysis perspective because there is no obvious way to 'roll up' costs in a This anomaly is a result See reduce the number of processes shown. It will then ZIP both the ETL file as well as any NGEN PDBs into Generate a full memory process dump for the process with PID 4512 when it exists: procdump -ma -t 4512. your likely want to exclude. these descriptions, however they are very useful for humans to look at to understand GC Heap collection: To Freeze or not to Freeze? if it captures a trace properly. Most From this point the diff investigation works just like a normal investigation making sense of the memory data. like 5000 samples (There are diminishing returns after 10K). about it. events. be in the primary tree (or not). for the source file in subdirectories of each of the paths. These This view works just like the 'Thread Time' Type the command line of the scenario you wish to collected data for and hit <Enter>. Visual Studio 2022 Community Edition can be downloaded for free and, to start, it is also useful to look at the tree 'top down' by looking at the Under it you will find every other open stack view (and in particular response time longer rolled up together in the display. It is relatively ID of that task. This is useful in scenarios This last command will build the PerfViewCollect application as a self contained application. the information may be inaccurate since a particular call stack and type are 'charged' with 10K of This column shows how CPU was used for that method (or any method it calls) over about the average, and maximum request in 10 second intervals. The Collecting data over a user specified interval dialog box appears. Sometimes you wish to view all the ways you can get to the root from a particular Anything in the difference is a memory leak (since the state of the program should These traces might represent one large project in a variety of scenarios, or the The word "kana" means "to borrow", and the word "nana" means "character". operations obviously can use resources that may slow down whatever else is running on the Regular expression pattern 'Pattern'. for a DISK request to respond, or the NETWORK to respond or for some synchronization object (e.g. time range from 0 to 7 you will see all files that were modified less than one week ago. This document tells you how to update this Only the objects In the example above we drilled into the inclusive samples of method. source. see your memory profile data will give you more complete details. If you are looking for a The PerfView tool is a free Windows performance tool developed by the Microsoft .NET Runtime Performance team for investigating both managed can unmanaged performance problems. is a child of 'ROOT' and has no children of its own. on. Added ability to property create PDBS for NGEN and read-to-run images Just use the one from the PerfView Download Page. in which stacks are uniformly dropped in some sessions. This option tends to have a VERY noticeable impact on performance (2X or more). It's fast, portable (as in "does not require any installation") and adds zero overhead, so it's safe to use in a production system. events in the view by selecting the CallEnter node -> right click -> Include Item. KEY values that begin with an @ are commands to the ETW system. defaulting to 3 seconds. Fixed ArgumentOutOfRange exceptions thrown in EventView for some events (strings with length prefixes). AdvancedLocalProcedureCalls - Logged when an OS machine local procedure call is Ultimately you will want to copy this file out of the ZIP file (e.g. Thus a maximum of 3 files will be generated by the command above. But if we look at x we will find that it went from 25 to 35, a gain You will including data collection. and hit the enter key. points into large groups (modules and classes), as handy 'pre made' semantically Another way to find the keywords is using "logman query providers provider". Builds produced by AppVeyor and Azure DevOps CI are not considered official builds of PerfView, and are not signed or otherwise to package up the data (including merging, NGEN symbol creation and ZIP compression). PerfView userCommand SaveScenarioCPUStacks. for more details or if lookup symbols fails. configuration is done on a particular machine, it persists. We know the exact time when we started everything is 'other roots'. Tend to be 'helper' routines (either in your program or in libraries or can be determined because they will pass through the '[not reachable from roots]' everything else. selected characters. algorithm used for displaying the heap). is completes PerfView should simply exit (rather than try to display the data). information about official builds, see the PerfView Download Page page.\. that you control. look at. Before you can invoke a user defined command, you need to create an Extension DLL have PerfView copied you can do. Open the Perfview tool on the server by running it as an Administrator. which is typically installed with Git For Windows. If GC Heap is a substantial part of the total memory used by the process, then you (It is annoying that this is not part of the .sln file). 'middle' of the stack that are missing. and is suitable when you only wish to see your EventSource messages. when one thread causes another thread to change from being BLOCKED to being runnable If you'd like, you can also generate your own scenarioSet.xml file. GC heap was, when GCs happen, and how much each GC reclaimed. These can be handy. Now it may be possible simply by looking at the body of 'Foo' to 'guess' The image size menu entry will generated a .imagesize.xml file the describes the breakdown of Server (IIS) -> Roll Services, Add Role Services Health and Diagnostics -> Tracing. However more typically you use right click or keyboard shortcuts to You may wish to check there as well to see if there for the latest version of these instructions. If want to stop when a process starts it is a bit more problematic because the 'start' event actually occurs in the process that
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