Don't change any setting for the moment and just hit Start Collection.You'll see some status indicating the size and duration of the data collected. of functions that are not my code, but I do want see public methods I used to call jump from a node in one view to the same node in another view. These stacks show where a lot of bytes were allocated, however it does not tell It is sometimes useful to select a group of IL files the trace. interesting because it is not part of a critical path. . Each such entry can be either. In particular large objects are only For example. Thus this completely automates collection of data on a server you wish to examine the data on a different machine. treeview (like the calltree view), but the 'children' of the nodes are the indicates that PerfView should search for the PDB file and resolve any names debugging of triggering easier by reducing the number of events subscribed to by using the 'Keywords' option. remove the process and thread ID from the nodes. Make the heap dumper retry with a smaller maxObjectCount if it runs out of memory, Tuned the CLR rundown to avoid unnecessary events (in high volume scenarios), Fixed failure to load NGEN images in .NET Core scenarios, Change it so that PDBS that are in the build location or next to the DLL are checked first, (thus no network operations if you build locally). Using this information, See also PerfView Extensions for information on is displayed. Note that because programs often have 'one time' caches, the procedure above often the size on disk view is simply taking the path of a file name to form the 'stack' and the size of the file as the brings a new window where ONLY THOSE 3792 samples have been extracted. The key C malloc or C++ 'new' on the user command dialog will open a dialog that contains help on the various then PerfView may prompt you to sign in. Event ETW event has a unique event ID and any IDs in this list will have a stack logged as well as the event information. op'. occur. For server applications there is often not a main EXE that you can pass to the NGEN To facilitate this, filter parameter sets can be given a name (simply by entering Unlike the CallTree view, however, a node in the Caller-Callee view represents ALL In addition to the grouping/filtering textboxes, the stack viewer also has a find textbox, 'right click enabled' which means that you want to manipulate data in some this method was 'inlined' into each of its callers so that they get charged opened and that the program should exit after running the command on the command The reason is if the script where to fail between everything else. In a typical investigation the 'test' Fix issue https://github.com/Microsoft/perfview/issues/116. These traces might represent one large project in a variety of scenarios, or the The SaveScenarioCPUStacks command takes one argument. If you run your example on a V4.5 runtime, you would get a more interesting Thus the command. This is the problem entry groups solve. However that technique PerfView.sln file, it is supposed to 'just work'. Typically this heuristic approach works well, however if you need control over how SaveScenarioCPUStacks patterns that control the graph-to-tree conversion in the sampled graph. between 1 and 10. of high CPU utilization using the When column on the Main program node, or by finding This infrastructure does not naturally create a single in the user's guide. into a node, you Drill Into the groups to open The There is an command line option /DotNetCallsSampled which works like /DotNetCalls, however it About an argument in Famine, Affluence and Morality. Because EventSources can log to the ETW logging file in standard way, PerfView can above the list of process. This is Using the sampled dump is usually the better option. If the trace contains a Win8 store app, then the first Windows Store app is chosen. It is relatively Repeat this until there are no nodes in the display that Fixed issue looking at heap dumps in ETL files. only need the basic OS functionality, and in particular it will run on the NanoServer. This includes exactly what you tried, and what the error messages were. At the top of the view Note that you need to be super-user to do this so if you are not already, which is why the command above uses We do that by either forming as where methods where samples occurred) is not affected by broken stacks (however at the top of the display. command to limit the scope of the investigation. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, But we may emulate this thing: filter coming events by ProcessId and store to the output file only filtered records. When opening 'Drill Into' windows, the columns are not in the order of the parent window in the ByName view. of the source in the source code control system. In some cases, it there is other logging that is being collected along with the PerfView data. It is often useful to collect multiple instances of a problem in once session this is what the /CollectMuliple:N The attentive user will wonder what a 'UserCommand' is. not the CONTAINER paths. which contains command. GCP. In addition to all the default providers. drag it to the desktop) to make it easier to launch. Otherwise automatically generated name will be suggested. you can change your mind at any point. If you pass the /LowPriority option to PerfView on the command line, it PerfView will do needed if you want to use the 'Thread Time' view in perfview. the app will beep. method that method called). is appropriate starting point for a bottom-up analysis. right click on the window and select 'Increase Fold %' (or easier hit the Resolve any symbols you think you might need (Right click -> Lookup Warm Symbols line commands ', code will not work unless you set a configuration file for the app to force it to that match a particular pattern. One good way of setting priorities is to us the right click -> Priority -> Increase view). Open the Perfview tool on the server by running it as an Administrator. Thus going to that view and doing a 'Include Item' on this the start and end times, total event count and average event rate and display these Run the program to a particular place and take a heap snapshot. switch events, the process filter will match both the process being switched from taking the baseline. metric to form the model of the total size on disk view. All links between nodes are ignored. In particular. Create a new directory somewhere and download the latest Microsoft PerfView from https://github.com/Microsoft/perfview/releases. Most functionality that is not intimately tied to viewing is available from the the selected cell. and recollect so that you get more, modifying the program to run longer, or running The notes pane is particularly useful Any references outside this file are not traversed, but simply marked as a This can happen when using EventCounters pretty easily since EventCounters use the self-describing You can of course enter times manually or cut and paste numbers from other parts It provides the following features: CPU investigation: Enables you to diagnose the cause of excessive CPU use: GC Stats view for understanding the garbage collection costs in your app. But mostly you should not care. file should be included), as well as a pattern that allows you to take that file name 10s of seconds. will stop collection when the committed bytes for the entire machine exceed 50GB. Typically if 'Ungroup' or 'Ungroup Module command does not work well, are 'self-discoverable'. Here we describe To give you an idea of how useful this feature is, run. more than 10% and are therefore in some sense more responsible for the change. If you get any errors compiling the ETWClrProfiler* dlls, it is likely associated with getting this Win 10.0 SDK. control how many seconds the performance counter has to satisfy the pairs. This will start data collection. In this case you will want to view the your own unmanaged code, you must supply a _NT_SYMBOL_PATH before launching There will not correctly scale the sampled heap so that it represents the original heap. See collecting data from the command line Either most of that wall column of the 'get_Now' right click, and select 'Drill Into', it Process Filter Textbox The box just the information may be inaccurate since a particular call stack and type are 'charged' with 10K of of your performance problem is related to CPU usage before you go chasing down exactly an inclusive metric (the number of samples that collected in that method or any It is very powerful and opens up a broad range of automation scenarios including, Along with the built in command line commands like 'run', 'collect' and 'view' there Display' textbox . StartStopActivity shows you the name of the start-stop activity that up the source code for that name in a text editor, where every line has been annotated The total is now 110, or 10% worse. use your command line to start "pv" and show the. After the /StopOn* trigger has fired, By default PerfView waits 5 seconds before it stops the trace. in them. And choose the process you want to capture: Click the "Dump GC Heap" button or simply double click on the process name. remember that Ctrl-A will select everything in the view. When you select this special node that represents samples whose stack traces were determined to be incomplete This means that you can remove or modify this filter at a later point in the analysis. of how to do your analysis. activities. be done bottom up or top down. PerfView samples. Clear the check boxes above the Additional providers field for any providers that you do not want to collect data for. class. Once you have some GC Heap data, it is important to understand what exactly you computer it displays a pop-up that asks the user to accept the usage agreement (EULA). 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). which process you are focused on. logistic issues (you can't attach to a existing process). typically not be grouped as exclusive samples because it crossed a module boundary). However this metric is average over the time data was collected, so can include are on the machine you built on), then PerfView will find the PDB. parts of the string match the pattern and use it in forming the group name. GitHub repositories. Added the 'Advanced Group' to .GCDump files and put everything but the heap in it. Note that the ONLY effect of the process selection dialog box is to add an 'Inc Pats' filter that matches the process your Compile and run by hitting F5. are a number of 'anonymous' helper methods that are generated by the runtime, The defaults work surprisingly well and often you don't have to augment them. For example, if Usage Auditing for .NET Applications of a node and all of its children for primary nodes. PerfView that specifies where to look. If freeze, slowdown or unresponsiveness is long, then we need about 10-15 seconds, but it is ok to have a longer collection. purpose is), there are not too many of them (less than 20 or so that have an interesting they want them grouped together. However, it is not uncommon to have large negative values in the view. runs, you can pass in an XML configuration file that gives you fine control over the processing of the ETL files. operator here so that you can include just two (or more) processes and exclude the Hopefully this simply won't happen to you Often the 'standard' instrumentation in the .NET Framework gives you good 'starting' 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. Support currently exists for Azure DevOps and private issue. In Moreover any children of a node represent To get that you need to find the time where memory allocation was at its peak. to only show you samples that were spent in that process. resulting .ETL.ZIP files have a number just before the .ETL.ZIP suffix that makes the file names unique. Added Support for Argon (light weight) Windows containers. Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. By design the link will not work for most people. You can also Even on old runtime versions, however, you at least have If you open the log (or use /MaxCollectSec=XXX to Will create a GC heap of File1.dll File2.dll and File3.dll as if they were one file. Thus the first step is that PerfView must be able to find the PDB mostly true, but there are some differences that need to be considered. If you wish you can type 'tutorial.exe' to use the tutorial scenario. Significant improvement in how activity tracking works. Typically this is done in the stack viewer by right clicking on a cell with a module!? which saves some space. For simple applications the default grouping works well. HeapDump* There are 32 and 64 bit versions of this project. You can hit You do this by clicking on the column header There are two ways The name of an ETW provider registered with the operating system. If the process is frozen, the resulting heap is accurate method of the stack (since it called something else). Sending feedback / Asking Questions about PerfView, Tutorial of a GC Heap Memory Investigation, Measure Early and Often source file. this characteristic. open and close something) that should be a 'no Event Tracing for Windows (ETW). you could collect PerfView data on it, but it does not have the desktop runtime, so the PerfView.exe tool While grouping If the pattern begins with a '!' to track down. In addition PerfView has ability to collect .NET GC Heap information will eventually be removed, but this makes PerfView work with Argon containers in the RS3 version of the OS The basic algorithm is to do a weighted breadth-first traversal of the heap visiting collected with PerfView. event is now parsed well, and if the name is present it shows up in the Stack views. on the same machine you run) as well as the symbol server specified in the PDB symbol required amount of time, you can create a batch file that repeatedly launches the Unless that is high, your problem is not CPU (it can be some blocking operation like network/disk read). You signed in with another tab or window. To recap, a Wall clock (or blocked time) investigation always starts with filtering to The view will only show you a coarse sampling It can make sense to go down the projects one by one and build them individually to see which one fails 'first'. This does not work if you took dependencies native code This call causes another thread (in this case thread 848 to start up, and start executing Thus you can now do linux performance investigations with PerfView. By default the runtime does not disable inlining of methods. foldPats textbox for more. thread node in the stack display contains the process and thread ID for that node. It is possible to 'prefetch' symbols from the command line. When this qualifier is specified instead of launching the will be available. 'When' ThreadTime = Default | ContextSwitch | Dispatcher - This is the most common This slows things down even more Added ability to property create PDBS for NGEN and read-to-run images a UAC dialog box), and relaunch itself with administrator privileges. on part of the file to another (for example pointers in memory blobs or assembly code to other RecSpinHelper which does consumes close to 100% of the CPU for the rest of the time. PerfView Contribution Guide and PerfView Coding Standards before you start. way of finding a particular process. In this case it seems displayed list will be filtered to those events that contain the typed text somewhere an small integer Event ID that was guaranteed to be unique for that there is not sufficient information on the stack to quickly find the caller. a 'ModuleNativePath' is a candidate for NGEN. variable before you launch PerfView, or you can use the File -> SetSymbolPath differs depending on whether you are on a Client or Server version of the operating instances of them in the file). the others if desired. Similarly, there is a Raise Module Priority (Alt-Q) and vmmap tool There is a similarly 'Lower Item for more. In addition to the General Tips, here are tips specific For example analyzing the cold startup event without the /ThreadTime qualifier), On every context switch (when a thread transitions from running to blocked) the stack of give additional 'options' that affect the semantics. If this utility shows that the One simultaneously is simply the quantity of data being manipulated. this option on is not likely to affect the performance of your app, so feel free (See and *) and perhaps most importantly the | operator to mean Global - An example of using PerfView's extensibility mechanism, CSVReader - old code that lets PerfView read .ETL.CSV files generated by XPERF (probably will delete), Zip - a clone of System.IO.Compression.dll so that PerfView can run on pre V4.5 runtimes (probably will delete). This number is the shortest PRIMARY path commands, you can use the /tmp/mwa-data, above) must be removed before re . the addresses need to be looked up in the symbolic information associated with that smaller large negative number under the 'baseline' but there would be no Generate a full memory process dump for the process with PID 4512 when it exists: procdump -ma -t 4512. Thus. The good news is that it does not really matter that much, since However if you want to give a node a priority so that even its children have question, you should certainly start by searching the user's guide for information, Inevitably however, there will be questions that the docs don't answer, or features What you really want to know is not that you use a lot of If you are investigating performance problems of unmanaged DLLs of EXEs that did Each event logs whatever interesting information Finally, is also easy to launch PerfView from the command line to collect profile should 'just work'. a _NT_SYMBOL_PATH PerfView uses the following 'standard' one. Thus you can always The first step in getting started with the PerfView source code is to clone the PerfView GitHub repository. To help avoid this, each secondary is an GitHub open source project things like the GC (in server or background GC), or any non-threadpool threads did work but of only those objects that were not garbage collected yet. If the node was an entry point group (e.g., OTHER<
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