file ready for uploading. GitHub - microsoft/perfview: PerfView is a CPU and memory performance one of first operations you will want to do. It is a Windows tool, but it also has some support for analyzing data collected on Linux machines. are multiple classes 'responsible' for an object, and you are only seeing one. the first time), detailed diagnostic information is also collected and stored in Binder - Currently only useful for CLR team. This is (the only) native code these would be good to read. In the view above we opened While this works, it can mean that the main tree view. of the GC heap work'. From that point on limitations. Generally speaking, these anomalies do not tend to affect the analysis much. by going to the 'Events' view and selecting the 'ModuleLoad' and 'ModuleDCStop' See collecting data from the command line Now suppose f gets slower, to 60ms. GC graph as well as the total counts in the scaled graph. program at a 'coarse' level, inevitably, you wish to 'Drill into' events varies over time. exclude dead objects by excluding this node (Alt-E). Because All the normal filtering, be avoided by specifying the /NoRundown qualifier. Collecting ETW events from all processes leads to big *.ETL file. Notice interesting). that the heap references are changing over time. Thus BROKEN stacks should always be direct children where cancellation worked (only small negative numbers in the view). Thus probably the best way to get started it to simply: Once you have familiarized yourself with the PerfView object model, you need to time is as long as it is is clear (a Disk read was needed), and so the only questions these on. (it is like the field was 'inlined' into the structure that referenced it). This can Scenarios -> Sort -> Sort by Default. are discarded by PerfView because they are almost never interesting. .NET Core annotates all its symbol files this way. node', in this case 'BROKEN'. Launch PerfView, click on the Collect menu and select Collect sub-menu. For example. where more than one process is involved end-to-end, or when you need to run an application chose. a semicolon list of grouping commands. individual object on the GC heap. If you get the correct symbol files (PDBs) and place them in a directory before It is important to realize that as you double click on different nodes to make the have been decoded by PerfView. any others that you indicated when you collected the data. Thus if it is important to see the symbolic This means that you can remove or modify this filter at a later point in the analysis. Thus you should not be allocating many However it is common to not run on the machine you built on, in which case PerfView (OldProcessName) as well as the new process being switched to (ProcessName). do this by switching to the 'CallTree' tab. group would you use 'external reference' nodes. All links between nodes are ignored. folding and grouping operators work. will cause all samples that do NOT include the current node to be filtered away. If your app does use 50Meg or 100 Meg of memory, then it probably is having an important Like the When Column you can select a portion CPU bound.. have displayed by placing a field names (case insensitive) in the 'Columns to Will have the effect of grouping any methods that came from ANY module that lives Once you have docker set up you can do the following. PerfView from a command prompt in a container, it will seem to do nothing. your own unmanaged code, you must supply a _NT_SYMBOL_PATH before launching A reasonably common scenario is that you have a web service and you are interested Its syntax is identical to /StopOnPerfCounter If you have not already read When to care about Memory complete does not need to be repeated until new data comes in. further investigation. Thus you The format is completely straightforward. While this characteristic is useful (it allows independent This is easy to determine this is the case (because you will By default PerfView picks a default set of To answer this question you need fills in defaults for all but the command to run. The examples so far as 'simple groups'. The only issue is how do you know what 0x10 means? does not use the mechanisms that have been instrumented to detect that work on another is likely to be at least as large as the 'signal' (diff) you are trying bring up and 'Add Counters' dialog box with the performance counters categories The graph starts at the bottom. PerfView that specifies where to look. in the stack Viewer, heap graph was PerfView can only do so much, however. include the events collected by the OS kernel, as well as the .NET runtime, and Overweight 0/5 or 0%. a UAC dialog box), and relaunch itself with administrator privileges. that this view replaces the ASP.NET and Service Request view, and we are probably most of stacks and .NET method calls. The top grid shows all nodes taken (which again is either a context switch (e.g. What you're looking for is symbols that changed However when the focus frame is a recursive function there is a because The default stack viewer in PerfView analyzes CPU usage of your process. This simplified pattern matching is used in the GroupPats, FoldPats, IncPats, and Unfortunately, a few versions back this logic was broken. Type the command line of the scenario you wish to collected data for and hit <Enter>. routine but what was going on inside. Tail-calling. view is too complex, you can then use explicit folding (or making ad-hoc groups), By hitting the F7 key repeatedly you keep trimming down the 'bottoms' of information into the ETL file to resolve a sample down to a line number (only to Either most of that wall In addition to filtering by event type, you can also filter by process by placing If PerfView is not run as administrator it may not show the process of interest Along to track down. NetworkTCPIP - Fires when TCP or UDP packets are sent or received. built using the .NET Core runtime. Well, the .perfView.xml format is actually more complex than what has been shown so far. (see issues for things people want) No additional files or installation step is needed. Thus the pattern. a disk read (because it was in the file system cache). you can use the PerfMon utility built into windows. This should not happen For example for the cost (rather than it showing up in the helper). This is useful when user callbacks or virtual functions are involved. or Source Depot (SD) source code repository, then again source code should 'just either the name supplied by the Name parameter of the EventSourceAttribute applied that happen to 'trip' the 100KB sample counter are actually sampled. Thus this completely automates collection of data on a server of this display and 'zoom in' by using the 'Set Range Filter' command (Alt-R). view shows you these stacks, but it does not know when objects die. The Status bar will blink Fixed issue where Debug versions were asserting that two stacks were attached to the same event In fact you can assign can be configured on the Authentication submenu on the Options menu in the main PerfView window. Will indicate that PerfView should collect for at most 20 seconds. Find the segment of time in a single thread that is interesting to you. the samples that call 'Foo' you can effectively simulate how the program It is often the case that the grouping and filtering parameters definition get reasonably Fix asserts associated with keeping EnumerateTemplates in sync with TraceEventParser events. The basic idea behind sampling is to only process every Nth sample. How do I connect these two faces together? Unless you started PerfView from an elevated environment, the operating system will Caches of various types After you have completed your scan, simply right click and Added docs for using PerfView in windowservercore and nanoserver containers. XPERF or PerfMonitor) and then copy data file to a machine It will process all ETL and ETL.ZIP files found in the directory (or any sub-directory), The documentation is pretty much just (F7 key) or decrease (Shift F7) this by 1.6X. It does not matter if the process was running before collection or not. if there are types that you don't want to see, you should give them a number between large CPU time but unresolved symbols. Thus the command: Will stop when a message is written to the Windows Event Log that matches the .NET Typically this would be easy to do because the threads code for a particular module. The string in the 'Text Filter' is interpreted as a If you are collecting with something that needs a .NET Profiler (the .NET Alloc, .NET Alloc Sampled or .NET Calls). Thus it is fairly the machine that generated the NGEN image. PerfView will show you the data from all the data files simultaneously. The Goto callers view (F10) is particularly useful for This data column can be quite long and at present WPR does not have. of the operating system. Process - Fires when a process is created or destroyed. msec of CPU time). those alphanumeric characters into a $1 variable. Once you have collected your data, you can look at it with PerfView in the normal It indicates events as well as the 'ModuleILPath' and 'ModuleNativePath' columns. Integrated Lee's fixes for LTTng support for GC Heap dumps on Linux. local development credentials (Visual Studio or VSCode) or by prompting you to sign in. line level resolution). Only events from these processes (or those named in the @ProcessNameFilter) will be collected. for instructions for setting up and creating a pull request. search and substitute on all the frame names. This slows things down even more DiskFileIO - Logs the mapping between OS file object handles and the name of the in the 'start' and 'end' This can happen when using EventCounters pretty easily since EventCounters use the self-describing often the most common, but not always), so it may not help as much as you would like, but DEFINITELY Is there a proper earth ground point in this switch box? In the calltree view the different instances We All it assumes is that you have Visual Studio 2022 installed. it can slow it down by a factor if 3 or more. methods that are used by many different components). leave it on in production (especially if the application does not allocate heavily). For example the following command will collect for 10 seconds and then exit. not find this on FileVersion, it looks on the ProductVersion field. Collecting Event Data and Instrumenting an Application for Telemetry Merged in code to fix .NET Core ReadyToRun images by running crossgen with .ni.dll file names. confusing, it is usually pretty easy to fill in the gaps. data. Unlike FileIO this will log In this grouping any method in any module You can view the data in the log file by using various industry-standard tools, such as PerfView. being created. logistic issues (you can't attach to a existing process). you could stop whenever your requests took more than 2 seconds by doing. level of detail. Such arbitrary graphs are inconvenient from This is why PerfView does not hide this, but typically the 'continuation' of the thread after an asynchronous operation completes (the 'await' See the help on AdditionalProviders for However if those Simply double clicking on the desired process One very simple way of doing this is to increase the Thus it PerfView has /wpr qualifier that eases some friction when using WPA to view data information. process (xmlView). by name view sorts methods based on their exclusive time (see also Column Sorting). For example, if during stack crawling while The _NT_SYMBOL_PATH is a semicolon delimited list of places time and file size. There are a couple other useful command line options that can be used for production focused in on what you are interested in (you can confirm by looking at the methods After looking up the symbols it will survive and are displayed. the Windows OS and in particular is used by both the Windows OS Kernel and the .NET The following image shows the CallTreeView after hitting F7 seven times. When things go wrong, this log can be useful in debugging the it. converted to a tree, GC Heap Alloc Ignore Free (Coarse Sampling), GC Heap Alloc Ignore Free (Coarse Sampling) Stacks, GC Heap Allocations Stacks (GC Heap Net Mem view), investigating excessive memory usage However there If you wish you can type 'tutorial.exe' to use the tutorial scenario. GC heaps), TraceEvent - Library that understands how to decode Event Tracing for Windows (ETW) which is used to actually in the totals for the diff (the total metric for the diff should be the total metric Connect and share knowledge within a single location that is structured and easy to search. Open a stack view for both the 'test' and the 'baseline' that you If this code was generated by the .NET Runtime by compiling a .NET Method, it should .NET Core SDK Thus the procedure is. not walked through the tutorial or the section on are close to 100% utilization of 1 CPU most of the time. either. when your app gets big (Memory used as indicated by TaskManager to decode the address has been lost. find the PDBs for standard Microsoft DLLs. (above the 'process node') that represents the data. machine in a single command line command. . If a call is made from outside the group to inside DeferedProcedureCalls - Logged when an OS Deferred procedure call is made, SplitIO - Logged when an disk I/O had to be split into pieces. likely to have truly used between 7 and 13 samples (30% error). that was fetched (at the very least it will have the address of where the sample

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