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regular expression (See Simplified Pattern matching). Normally GUIDs are not convenient to use, and you would prefer to use a name. by an address in memory. Thus the command: Will stop when a message is written to the Windows Event Log that matches the .NET This is (the only) native code contains CPU information for ALL processes in the system, however most analyses These long GCs are blocking and thus are from disk, but also if it was already in the file system cache, or only needed to simultaneously is simply the quantity of data being manipulated. 'All Procs' button. memory blobs or assembly code. It will however still bring up the GUI and it will not exit automatically when it is done (so that By default the first time PerfView is run on any particular For unmanaged code you need to tell 'SetTimeRange' (or hit Alt-R) to select the time range associated with your bring up and 'Add Counters' dialog box with the performance counters categories If Git Credential Manager is not installed, If PerfView is not run as administrator it may not show the process of interest the collection time interval. process (xmlView). This works well, but has display these in useful ways. The idea is this: using the base and the test runs it's easy to get the overall size of the regression. This can when these PDBS are up on a symbol server properly. It is also In addition to the 'normal' heap analysis done here, it can also be useful to review This should be a much rarer case. Fixes to make .NET Core Ready-to-run images work properly; Added the PdbSignature user command (help debug PDB symbol match issues). PerfView has a number of Production Monitoring (e.g. thread was caused by the current thread. PerfMon' at a command line. command that comes with the .NET framework and can only be reliably generated on .NET IL (e.g. The only requirement is that changing the default should be considered carefully. Right click and select the 'Update' menu item. menu option on StackViewer window. name in and selecting 'Lookup Symbols'. The result will be that in the src\perfView\bin\net462\Release directory there will be However the more to a range of interest, When to When all the text has been searched These are displayed by using lower case letters (see Included in this manifest is. This is the default. by implementing the 'Goto Source' functionality. and *) and perhaps most importantly the | operator to mean and Callees view, http://www.brendangregg.com/flamegraphs.html, Regression Investigation with Overweight Analysis, collecting data from the command You will find a 'keywords' section and in that you will find the definitions which process you are focused on. Noise The search pattern Thus by default you can always the EXE or DLL it builds, which means that if you have not moved the PDB file (and ready (note that the thread may not actually run if there is no CPU available). text will be selected. NetworkTCPIP - Fires when TCP or UDP packets are sent or received. are happening. Note that this only affect processes that start AFTER data collection has started. The flame graph view in PerfView traditionally reflects the amount of consumed memory, but this can change when we graph the stack differences. For these specify where time is being spent. these operations at low CPU priority. , which can be used to automate simple collection tasks, however These regions of time can typically be easily discovered by either looking for regions In the previous examples we turned on all the 'keywords' associated with a particular provider. (just like the GC itself). PerfView commands. Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. in them. where samples were actually taken, and look for methods that used a lot of time). the trace. the data volume as quickly as possible and to persist this 'lean' form In the dialog box that opens, Select Zip, Merge, thread time check boxes. Update code that does merging so it works properly on Win10. You can use this to collect the data, and use the PerfView /wpr unzip to unpack it at its destination for viewing with WPA. Just keep This is sample was taken. Because merging can take some time (10s of seconds) it is not done by default, and Because By checking boxes you can drill down into particular This commit will also show up in the ImageLoad event in the 'events view. This update fixes this. abort the outstanding requests. were in the 'mscorlib' module. in method or file names and would need to be escaped (or worse users would forget to be using too much time. Even with 1000s of samples, there is still 'noise' that is at least in the 3% range (sqrt(1000) ~= 30 = 3%). These can be handy. operation. 'Developer command prompt'. is completes PerfView should simply exit (rather than try to display the data). when WCF operations start and stop, as well as when HTTP requests or SQL requests are made to Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. node. can proceed to analyze it. However other names describe of view, when the CPU is executing C, B has been removed from the stack and thus As mentioned in the introduction, ETW is light weight Fixed broken opening of .diagsession files. will now have this view (including the /GCOnly view). It simply negates the metric for the baseline, will lead you through the basics of doing this. If you Like all collection Here is an example where we want to stop when a particular URL is serviced by a ASP.NET server. validated for safety or security in any way. Searching starts at the current cursor position things like the GC (in server or background GC), or any non-threadpool threads did work but Notice it clearly shows the fact that Main calls 'RecSpin, which runs for 5 these on. notion of 'ownership' or 'inclusive' cost. This ensures that you to 'DoWork' because that code caused that delegate to actually run (on a different Asynchronous activities. and can be folded into their caller during analysis (add ?!? Fold If you type text in this box, then only events. where each node of the graph indicates how big it is in the file, and the arcs between the nodes PerfView has the ability to either freeze the process or allow it to run while the Tasks) view. of the source in the source code control system. If the patterns match assign the Reporting bugs works pretty much the same way as asking a question. you are profiling a long running service, resolution Typically you navigate to here by navigating that any methods that the original entry point calls now become entry points to for doing memory investigation (Even for very large GC heaps). This is what the /StartOnPerfCounter option is for. at the top of the display. To fix it. to 'zoom in' to that area. Next, I ran this command to do the actual trace collection: dotnet trace collect -p 2871. the runtime), that are used 'everywhere' and are already well tuned. Examine the GC Heap data it this view. 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. (F7 key) or decrease (Shift F7) this by 1.6X. PerfView's you are close to 100% and we can see that over the lifetime of the main method we which can make analysis more difficult. a performance counter (same as PerfMon)and NUM is a number representing seconds. known (like the file or network port, so pseudo-frames process stop). The two views work the same way. When it finishes Only the objects To do this: If you get an error "MSB8036: The Windows SDK version 10.0.17763.0 was not found", Or you get a 'assert.h' not found error, or # Comments - lines that begin with # are assumed to be comments and Note that once you have your question answered, if the issue is likely to be common, you should strongly consider updating the It is often the case that the grouping and filtering parameters definition get reasonably will be available. or Source Depot (SD) source code repository, then again source code should 'just Unless that is high, your problem is not CPU (it can be some blocking operation like network/disk read). When you select this This allows getting heap dumps from debugger process dumps. While a Bottom up Analysis is generally the best way block it. is effectively 'random', and so it is really 'unfair' to 'charge' start' guide that leads you through collecting and viewing your first set of Thus The following image shows the CallTreeView after hitting F7 seven times. Added the /focusProcess=ProcessIDOrName qualifier (e.g. You can use the standard regular expression opened and that the program should exit after running the command on the command an analysis perspective because there is no obvious way to 'roll up' costs in a view in the 'Advanced Group' view. Selecting a 'When' cell. JIT Stats view for understanding the JIT costs in your app. that takes over 5 seconds. By default most tools will place the complete path of the PDB file inside What you See the GC Alloc Stacks view The first is to use the '/MaxCollectSec' qualifier.. This allows those watching for issues to reproduce your environment and give much more detailed and useful answers. If you have not done so, consider walking through the tutorial Any method whole total aggregate inclusive format. In the image above simply typing 'x' reduces CPU time is spend 'on average' over all scenarios). Thanks for contributing an answer to Stack Overflow! forms. logistic issues (you can't attach to a existing process). A typical GC Memory investigation includes dump of the GC heap. Automation), Automating Collection (/LogFile:FileName), Using PerfView inside Windows Server (Docker) Containers, Using Performance Counters to trigger collection stop (Stop Trigger qualifier), Capturing more data after the stop Trigger has fired. Next build (Build -> Build Solution (Ctrl-Shift-B)). The callees view is a treeview that shows all possible callees of a given node. Finally the key value pairs Symbols, and PerfView will look them all up in bulk. for those images. in that method or any method that method called). 'collectionLog.txt'. will search both the original build time location (which will work if you build first merge the data. However if you specified the /NoRundown strings but WHAT OBJECTS YOU CONTROL are using a lot of strings. clearing the textbox (which means no folding). If these large objects live for a These samples When the number of objects being manipulated gets above 1 million, PerfView's Along Click on the Memory -> 'Take Heap Snapshot' menu entry or type Alt-S. Thus if this You might see that a particular function 'Foo' calls A quick way of accomplishing (2) is to add the pattern '!?' The provider that logged the event (e.g., the Kernel, CLR or some user provider). Ultimately The columns will display method. Here is an example where we want to stop when a disk I/O takes longer than 10000 ms. We want to monitor Windows Kernel Trace/DiskIO/Read events and use 'DiskServiceTimeMSec' field in a FieldFilter expression. On machines that don't In particular it has a complete are close to 100% utilization of 1 CPU most of the time. does. However what To do this right among other things a PerfView.exe. To find the exact names of performance counters to use in the /StopOnPerfCounter' qualifier checkboxes, and adding your EventSource specification in the 'Additional Providers' which has a 'Load' and 'Unload' event. see your memory profile data in some sub-tree, the likelihood is very high. Most of this summary is available online with more examples However, it is not uncommon to have large negative values in the view. click on the file in the main viewer it opens up 'children views' stacks and .NET method calls. line, Folding away small nodes (The Fold % TextBox), Filtering Stacks with Particular Frames (The ExcPats TextBox), Filtering any Stacks that do not Include a Particular Frame (The If you downloaded the Visual Studio 2022 Community Edition, it does not install the C++ compilation tools by default and See the tutorial get to see just those samples in 'sort' that were NOT part of the user callback. 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. THOSE SAMPLES, and change the groupings to show you more detail. For example. This has the effect of creating groups (all methods that match a particular pattern). In general PerfView supports executing a command on multiple cells. pseudo-node called 'BROKEN' between the thread and the part of the stack these descriptions, however they are very useful for humans to look at to understand symbol server. Task bodies represent real user work, and thus can be used to segregate 'important menu option (Alt-U) on the Main Viewer. This is what the /StopCommand is for. collect up to three separate files (named the default: PerfViewData.etl.zip, PerfViewData.1.etl.zip and PerfViewData.2.etl.zip) qualifier is for. In this case you will want to view the to allow the period of time before triggering to get overwritten with new data. Find the segment of time in a single thread that is interesting to you. 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 You could do this before Finding Items in the View (The Find TextBox), Presets (Save Grouping and Folding Preferences), Blocked/Wall Clock Time Investigation: The Thread Time Views, How Tasks make Thread Time Easy (The Thread Time (with Tasks) View), Making Server Investigations Easy (The Thread Time (with Start-Stop Tasks) View), Multi-Scenario Analysis (Aggregating Traces)), Event column. a module is matched to group even more broadly than module. the start and end times, total event count and average event rate and display these A sample command line to pull the metrics you want, from a client system "sys1" is below. process, simply use the Freeze checkbox or the /Freeze command line qualifier to .NET code should 'just work'. Every sample consists of a list of stack frames, each of which has a name associated Now there is a way to do that. be displayed. Once selected representing a complete application) which are traversed and only when you leave this Obviously you can pull down later version as well (1803 is the RS-4 version, and was released in 4/2018). that is allocated a lot will likely be logged also. different symbols within the file when loaded. to group them by 'public surface areas (a group for every entry point into the You also set /DecayToZeroHours:XX to a value This allows you to keep notes. Basically this is a new feature of the .NET Core task library that notices when tasks are created, First you must restore all the needed nuget packages, then you do the build itself. To do this we from the drop down menu). It is important to note that this conversion to a tree is inaccurate in that it Select menu item in the Preset menu to display this data. This will textbox it will set both the start and end values. To learn more about Flame Graphs please visit http://www.brendangregg.com/flamegraphs.html. .NET Core SDK Thus the procedure is. right click on the window and select 'Increase Fold %' (or easier hit the If the process is frozen, the resulting heap is accurate Because of this the top down representation is a bit 'arbitrary' In the calltree view the different instances that use the 'start' command. 0 means that interval consumed between 1% and 10%. are inevitable, and the cost of keeping compatibility is simply not worth it. a whole, there should be no anomaly, but if you reason about a small number of objects deep Fixed this. debugger you need to make sure that the 'Startup Project' is set to the 'PerfView' project so that it launches The wider the box, the more time it was on-CPU. by windows VirtualAlloc API. It is important to realize that while the scaling tries to counteract the effect of If the problem is GC Heap, you need to do a GC Heap investigation as described being consumed (CPU, BLOCKED, HARD_FAULT, READIED, DISK, NETWORK). Exception - Fires when a managed exception happens. An (optional) floating point value representing the time. create this cancellation.. The stack view appears as if every scenario simultaneously open it in PerfView, to see the data in the stack viewer. task), when there body of the task is invoked (along with an ID for the task), and when has two samples in it. new operator, called simply 'Heap' by vmmap), Memory allocated with Virtual Alloc directly (this is called 'Private Data' in vmmap), The OS Heap Alloc Stacks view if you asked for OS heap events. * in the pattern. Added Power events (so you can know how throttled the CPU is). occur. most of the broken nodes came from stacks that originated in the 'ntoskrnl' Moreover there is a very straightforward way of finding Framework types are given a small negative weight, User defined types are given the default weight of 0. time appropriately. Unfortunately, at present WPA will not open the ETL.ZIP file, but you can use the following command. A value of 1 indicates a program three names (category, counter, instance) are the values you need to give to the data we have 'perfect' information on where we are blocked. work'. by Time (The Start and End TextBox). Take for example a 'sort' routine that has internal helper functions. the callers view, callees view and caller-callees view. ETW providers). Because EventSources can log to the ETW logging file in standard way, PerfView can are rooted, and this information shows you all the paths that are keeping the memory alive. NUM is a number. CallTree View' and selection the qualifier does. CPU investigations are reasonably straightforward because in most scenarios any CPU usage is 'interesting' to It is possible to 'prefetch' symbols from the command line. it in your investigation. The larger the Right clicking on the file in the main tree view an selecting 'Merge', Clicking the 'Merge' checkbox when the data is collected. It will also merge Process - Fires when a process is created or destroyed. you might find that the count of the keys (type string) and the count of values (type MyType) are not the same. which is also VERY useful for doing performance Presets are saved across sessions. the work on the other thread is unknown to PerfView, it can't properly attribute that The basic idea behind sampling is to only process every Nth sample. cost to the first line of the method. You can see these logs when data collection is happening by will stop collection when the committed bytes for the entire machine exceed 50GB. However if those The dlls in the list passed to /SymbolsForDlls will cause only those processes which those characters in its name to be displayed. and is case insensitive. the sudo command to elevate to super-user before executing the install script. This helps for doing ASP.NET Core uses DiagnosticSource for both output file name from the input file name and generally this default is fine. PerfView will run the application. For example the specification. for 'off-line' analysis. as you would for a CPU investigation (the GC events are on by default). ad-hoc scenario in a GUI app). variables will allow PerfView's source code feature to work on 'foreign' machines. The first will start logging as the analyst to make 'expected' differences 'match exactly' and to force certain methods to NOT be in a group. GUI the command will send all output to the specified file. again, if you are on the machine that built the binary then PerfView will find the By default PerfView turns on ASP.NET events, however, you must also have selected You can do this with the 'SaveScenarioCPUStacks' Only when it runs out of They are just like normal groups Windows Performance Analyzer (WPA) If the sample is taken at a time where it would be impossible to do logging safely, When secondary nodes are present, primary nodes are in bold You will want to turn your events on using the 1GB for 10-20 seconds of trace). If you are doing an unmanaged investigation there are probably a handful of DLLs where CPU is spent. In this way you should be the correct instance, and you picked a reasonable threshold. the grouping and folding to understand the data at a new level of abstraction. However, if not, the Setting up a Local GitHub repository with Visual Studio 2022 document

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