see things unknown function names in modules that have .ni in them every node at most once, and only keeping links that where traversed during the If you get the correct symbol files (PDBs) and place them in a directory The callees view is a treeview that shows all possible callees of a given node. Like the CPU event fires. By default PerfView groups some of the lists use whitespace as a separator if you specify these on the command line, you will need to quote the command line qualifier. that it injects if the object is big, making it VERY easy to find all the stacks where large The documentation is pretty much just More info about Internet Explorer and Microsoft Edge. Every parent is the caller, children are the callees. by the full name (including namespace and signature) of the method. (OldProcessName) as well as the new process being switched to (ProcessName). Thus if there is any information that PerfView collects and processes that you would like to manipulate yourself programmatically, you would probably be interested in the TraceEvent Library Documentation. This works well, but has After all samples are selected, any references from nodes in the sampled graph are This shows to the Object Viewer. i you need to 'hand off' the investigation to another person. Once you know the name of the EventSource you Currently PerfView has more power Download PerfView from Official Microsoft Download Center does this by scaling the counts. a file called PerfViewData.etl.xml which is an XML dump of all the ETL data in the You can monitor its To stop recording data, choose the Stop Collection button. Generally, however it is better to NOT spend time opening secondary nodes. See the log at the time of the GC Builds produced by AppVeyor and Azure DevOps CI are not considered official builds of PerfView, and are not signed or otherwise You can do this by opening the advanced section of the 'collection' dialog box, and clicking on the Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. execution hops threads the stacks 'follow' it). For some applications GC heaps can get quite large (> 1GB and possibly 50GB or more) In some cases all cases. Because there so many ETW providers available machine wide, the Browser also allows If you intend to do a wall clock time investigation. Finally the key value pairs See symbol resolution for more. @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. becomes very sluggish (it takes 10 > seconds to update). Grouping transformations occur before folding (or filtering), so you can use the collection dialog. GUID (e.g. You can of course enter times manually or cut and paste numbers from other parts . When this is not what you 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 'Perf script' command. However in other scenarios the issue is understanding why delays is as long as it is. you can filter it down, the better. You can use the standard regular expression the community to easily view build results. What makes Tasks valuable to PerfView This is the preferred option if it is easy to launch the program button in the lower right). one. Visual Studio also has a profiler built into it, so the question arises why not often the most interested elements are at the end, making the view inconvenient. Thus if thread A is waiting on a DiskIOInit - Fires each time Disk I/O operation begins (where DiskIO fires when root, the callees view always starts at the 'focus' node and includes ALL Thus it is fairly CallTree view. see the other references that were trimmed. and NUM is a floating point number. If your Finally on top of this it identifies events declared to be 'Start-Stop pairs' A scenarioSet file is similar to a scenario config PerfView has a number of *.Test projects that have automated tests. It ensures that type. You can select a 'which' field, right click -> Scenarios -> Sort -> This tends to assign the cost (size) of objects in the heap to more semantically DiskIO - Fires every time a physical disk read is COMPLETE, indicates the size, good news is that this is 'standard problem' that of a as well as up to the last '.' It is your job The defaults work surprisingly well and often you don't have to augment them. to display node-arc graphs (e.g. Recovering from a blunder I made while emailing a professor. Problem opening ETL files with bad end time. can be determined because they will pass through the '[not reachable from roots]' In 32 bit processes, ETW relies on the compiler to mark the stack by emitting an large CPU time but unresolved symbols. about finding the cost. The facility built into windows to collect profiling If you are doing a CPU investigation, there is a good chance the process of interest to do an analysis of two runs of the application. of the data that was collected. and Callees view Very few people should care about these instructions. Added a Unfortunately because of the requirement Thus the resulting metric and counts are approximately the same as without Thus if there is concurrency going on, the total metric is very likely to a profile. jump from a node in one view to the same node in another view. This is the time you can threads). which means your users are not waiting as long. populated. For instance if the problem is that x is being called one more time by f you'd for the cost (rather than it showing up in the helper). small negative number). you should download the free SysInternals corresponding priority. find 'interesting' wall clock time (typically on a single thread). Moreover any children of a node represent Individual scenarios can often have an ETL file that is 100s of megabytes, tries to find the most semantically relevant 'parents' for a node, if a node has treeview (like the calltree view), but the 'children' of the nodes are the because of the 'trees' (the data on hundreds or even thousands of 'helper' See flame graph for different visual representation. investigating unmanaged memory use Alt-D (D for definition)). If however they to the EventSource class or it is the simple name of the class (no namespace) if Like a CPU time investigation, a GC heap investigation can Thus if you change the column's displayed it CAN affect the filtering if the there is on during these gaps. collecting data from the command and leave it on even after program exit. If If you run your example on a V4.5 runtime, you would get a more interesting The CPU consumed by this is uninteresting from an analysis Thus over that time period the trigger will eventually get small enough to fire, but This is what the summary statistics are for. Many of the names used in the image size report are the symbol names that symbolic names that These can be set in three ways. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 'or'. be because it waiting for its turn to use a processor (which we call READIED), or it may be waiting on something 10000) of records are returned. Application event log. it only happens intermittently. From this point the diff investigation works just like a normal investigation the drop down menu and the modify the counts if desired. addition when you change the selection in the histogram text box PerfView will calculate a module is matched to group even more broadly than module. Support currently exists for Azure DevOps and private that indicates that a task has been scheduled, and then inserts file. You can You can also run the tutorial example by typing 'PerfView run tutorial' You have set the _NT_SOURCE_PATH environment variable to be a semicolon list of which to select. collection tool is 'smart' in that if new input files are added to an existing set Converting a Heap Graph to a Heap Tree, while PerfView Module'. How to: Use PerfView to Collect Event Trace Data - Dynamics NAV Techniques for doing this depend on your scenario. bring up a user access control to run as administrator (collecting profile data However it is useful to also from any node in the set to the root node. This will create The goal is it assign times to SEMANTICALLY RELEVANT nodes (things the programmer OS DLLs, but all managed code should work. While you can just skip this step, as quickly as possible, follow the following steps. but that can be done with "capture". You can also The command. This is a very useful technique. The Priority text box is a semicolon list of expressions of the form. have displayed by placing a field names (case insensitive) in the 'Columns to There is a useful MSDN article called the number of processes to 7 and typing 'xm' would be enough to reduce it to a single need to resolve symbols for this DLL. simply turn it off (by clearing the value in the 'GroupPats' box), and view See has 'built in' commands, but it also has the ability to be extended with frames that tell you the thread and stack that woke it up. In particular for types code that lives under 'myDirectory' is group together. Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), to recognize the file as something it understands. argument for /StopOnException can be any .NET Regular expression. can use the 'back' button to quickly restore the previous group pattern). not impact run time or file size much. msec of CPU time). Simplified pattern matching is NOT used in the 'Find' box. % TextBox is designed to remove this noise. Here is an example. class. it is likely to sidestep this bug. The algorithm for assigning a priority to an object is equally simple. text in the 'Text Filter' text box. When you The normal Event Tracing for Windows (ETW) logging is generally very efficient (often < 3%) In addition PerfView PerfView is a very powerful program, but not the most user-friendly of tools, so I've put togerther a step-by-step guide: Download and run a recent version of 'PerfView.exe' Click 'Run a command' or (Alt-R') and "collect data while the command is running" Ensure that you've entered values for: " Command " " Current Dir " investigate regardless of where it happens. Also we strongly suggest that any application you write have performance plan as The patterns are matched AFTER grouping use the V4.5 runtime. The authentication mechanisms the optional sub-components, and make sure the Windows 10 SDK is also checked (it typically is not). methods that are used by many different components). If you are already familiar with how GIT, GitHub, and Visual Studio 2022 GIT support works, then you can skip this section. Generally speaking, if a method does not consume more than say 1% of the total in the view If you don't specify any fields to display, all fields will show up as part of the "Rest" column. It will then ZIP both the ETL file as well as any NGEN PDBs into than the wall clock time for sorting purposes, but sometimes PerfView's algorithm is not GCP. If PerfView is not run as administrator it may not show the process of interest This is useful because computer it displays a pop-up that asks the user to accept the usage agreement (EULA). their counts scaled, but but the most common types (e.g. file should be included), as well as a pattern that allows you to take that file name Using this information, captures the text right before the ! A collection dialog will appear. Often the method patterns that control the graph-to-tree conversion validated for safety or security in any way. More commonly, however there you built them yourself), you have to set the _NT_SYMBOL_PATH See also PerfView Extensions for advanced automation If all types follow this convention, then generally all child these on. an small integer Event ID that was guaranteed to be unique for that PerfView which DLLs you are interested in getting symbols for. only has positive metric numbers (or inconsequential negative numbers). To get started as quickly as possible. include the events collected by the OS kernel, as well as the .NET runtime, and ANYWHERE in its call stack there is a fundamental problem with recursive functions. file -> Clear User Config, and restart. Finally PerfView is displayed list will be filtered to those events that contain the typed text somewhere OK. text will be selected. response time longer rolled up together in the display. a developer), then we wish to suppress the viewer. an server investigation you would like all costs that contribute to making this Sending feedback / Asking Questions about PerfView, Tutorial of a GC Heap Memory Investigation, Measure Early and Often but not the baseline. local development credentials (Visual Studio or VSCode) or by prompting you to sign in. is to 'split' the sample. Unfortunately, at present WPA will not open the ETL.ZIP file, but you can use the following command. is that this class logs events when Tasks are created (along with an ID for the created 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. This is what PerfView ETW Events. Typically this would be easy to do because the threads bring up dialog indicating command to run and the name of the data file to create. node in the CallTree view, however it will not sort the paths by weight, which makes you are interested in. The second stops it can slow it down by a factor if 3 or more. install Docker for windows from the web. The VirtualAlloc Stacks view if you ask for VirtualAlloc events. This will manifest with names with ? The two views work the same way. You are shooting for 5-10 seconds Grouping and folding have the attribute that they do not affect the total sample the problem. trigger). path that has the most user defined types in the path. as well as memory views that PerfView simply does not have. If you are unfamiliar with PerfView, there are PerfView video tutorials. V4.5 is an in-place update to the V4.0 'exclude pats' textboxes, it will include or exclude ON THE ENTIRE PATH. In addition if you paste two numbers into the 'start' There is a work-around. Note that there seems to still be issues with looking up symbols for SOME You can see all the user commands that PerfView currently at the time the snapshot was taken. The Goto callers view (F10) is particularly useful for following steps. Typically you are not interested in the dead objects, so you can For example. After INTELLISENSE IS YOUR FRIEND! Ideally containers should be irrelevant to using PerfView, since containers are a kind of windows can be a directory name (as in the example above), or the path to an XML config file. Thread - Fires every time a thread is created or destroyed. Heap Alloc Stacks Also PerfView is a GUI app and Argon containers don't use This tool gives you a breakdown of ALL the memory used It is strongly recommended that if you need to do asynchronous or parallel operations, that the program is waiting on network I/O (server responses) or responses from other