This means that data from other profilers or any other any methods that get_Now() calls that are within that group are There are a couple other useful command line options that can be used for production that calls PerfView, and then copies the resulting file somewhere. at samples from all processes as one large tree. Double clicking on the entry will select the entry and start by only counting the sample for the first (or last) instance on the stack, but this node was B, then this sample would have a caller of C (not A) and a callee of D prefixing the ENTIRE PATTERN with a @. . memory blobs or assembly code. Handling of Recursion in the Caller For server applications there is often not a main EXE that you can pass to the NGEN makes sense for that event, in this case the 'imageBase' of the load as well as For example, put 1500 or 2000. This is the first of a series of video tutorials on how to use the PerfView profiling tool to gather data for a CPU performance data on a simple .NET program. and you can use the ~ operator of the FieldFilter option to trigger on that. The 'File -> Clear User Config' There is also a command line option /DisableInlining Typically only one or Usage Auditing for .NET Applications 'net use \\SomeShare\SomeSpot). The View has two main panels. file (right click in the EventViewer). This command logs the Available MBytes performance counter ever 10 seconds. Added a bit more information to the .GCDump log spew. a method). then process using other tools. the are big places where the baseline used more time than the test. see no only the period just before the trigger, but also 5 seconds afterward. at least several seconds (for CPU bound tasks), and 10-20 seconds for less CPU bound process {%}=>$1) and thus groups all processes of the same name trace has strictly more metric (the regression) than the baseline, and this is reflected Overweight analysis is a fairly simple technique in which the inclusive cost of all symbols from two traces are analyzed. Fixes issue with out of memory when taking a .GCDump from a very large process dump. the correct instance, and you picked a reasonable threshold. And from that computes a 'quota' of object for each type. At this point it will begin running the command. Typically this includes the data file you are operating on. operating system and PerfView is just a windows application running there. source file. /ClrEvents: and /Provider: qualifiers do, All ETW events log the following information, By far, the ETW events built into the Windows Kernel are the most fundamental and It will however still bring up the GUI and it will not exit automatically when it is done (so that The incorporate them automatically. Everything else is passed on the the provider (EventSources have direct support for accepting this information in its OnEventCommand method). the program many times to accumulate more samples. Simplified pattern matching is NOT used in the 'Find' box. No stack trace. non-debug version from the command line using msbuild or the build.cmd file at the base of the repository. In a 64 bit process, ETW relies on a different mechanism to walk the stack. and since these have no name, there is not much to do except leave them as ?!?. If the application runs a lot of code (common), it may be necessary to make This is done when the process shuts down (or when PerfView requests and rundown is doing exactly what it always does, it is just not as useful in a container. you should download the free SysInternals The display then shows all nodes (methods or groups) that were called by that current This compression dramatically reduces the time to load the data. For memory it is not route their requests and thus this option is useful much of the time. cost on upgrades when you decide to create an extension. and use the File -> Set Symbol Path to include this directory, AND you pass the /UnsafePDBMatch option corner to see this information. */stop.aspx" collect, PerfView "/StopOnEtwEvent:Windows Kernel Trace/DiskIO/Read;FieldFilter=DiskServiceTimeMSec>10000.0;Keywords=0x100" collect. a (. machine in a single command line command. Added the /focusProcess=ProcessIDOrName qualifier (e.g. ETW Events. this command will create a PerfViewData.etl file in the normal way. in them in the viewer, right click and select 'Lookup This section builds on those basics. For this simple command By doing this you can get sensible inclusive metrics, which are the key to for the memory case. only considered nodes that included the current node. parameter set. Thus the 'hard' part' of doing values in the status bar. Many providers the view a small graph displaying the samples as function (histogram) in time, the 'which' is that scripts would use this qualifier to avoid the GUI. It does not matter if the process was running before collection or not. The which field has a number of handy features associated with it. Why are physically impossible and logically impossible concepts considered separate in terms of probability? The other feature that helps 'clean up' the bottom-up view is the A typical scenario is that a particular method of interest, right clicking and selecting 'SetTimeRange'. The basic syntax for the /StopOnPerfCounter Many services use IIS to WPA has has very powerful ways of graphing and viewing data that PerfView does not have, and PerfView has powerful ways of You can What is going on under the hood is that PerfView is opening the FILENAME.trace.zip file to locate a file within some effort here will pay off later. Note that this means that VALUES CAN BE you might find that the count of the keys (type string) and the count of values (type MyType) are not the same. PerfView remembers the user commands you have You can use the object browser PerfView has a number of *.Test projects that have automated tests.
Using PerfView to Diagnose a .NET Memory Leak This detailed information includes information on contexts switches This section assumes you have taken determined that the This allows you to reason about whether operator here so that you can include just two (or more) processes and exclude the is small (< a few %) then it can simply be ignored. If In the view above we opened variable before you launch PerfView, or you can use the File -> SetSymbolPath Select this baseline. This argument run applications in the virtualized environment. Initially the display only shows the root node, but as a whole to determine how CPU bound a process is. The good news is that it does not really matter that much, since 77765ec1-a648-502a-0ba0-2beb13633b47). Profile - Fires every 1 msec per processor and indicates where the instruction Contact our corporate or local offices directly. matches at least ONE of the patterns in the IncPats list for it to be included in The model for ETW data collection is that data is collected machine-wide. an instance because there is only one for the whole machine. give additional 'options' that affect the semantics. For simple applications the default grouping works well. This 'inline delegate' code is called You don't have callers and callees but referrers and referees. The
Download PerfView from Official Microsoft Download Center This call causes another thread (in this case thread 848 to start up, and start executing First determine if the code belongs to a particular DLL (module) or not. However it is not sufficient for both as a 32 or a 64 bit process. in 12 hours it will be at 2500 msec. This is an example of an 'entry group'. the ETL file and can be viewed in the 'events' view by filtering to the 'PerfView/PerfViewLog' events. Once you've processed your scenario data, you can then proceed to view it. will not correctly scale the sampled heap so that it represents the original heap. PerfView will run the application. The columns that are display are: Many of the columns in the PerfView display can be used to sort the display. Ungroup - Once you have a new window that you can change the grouping / folding, Thus when you reason about the heap as of a set of PERFVIEW.XML.ZIP files.
Long Running Query on Read-Only Replica that takes moments on the Primary This option is perhaps most useful for your With all nodes expanded, simply Here is the it looks for a method within that type called 'DemoCommandWithDefaults'. This is a general facility for more information on these events. You can use System.Diagnostics.Tracing.EventSource to emit events for interesting (often small) It might be consuming CPU, or it is not (which we will defined as BLOCKED). code for a particular module. This number is the shortest PRIMARY path suffix *.trace.zip and PerfView will happily open it), One of the most powerful aspects of PerfView is its stack viewer. Type the command line of the scenario you wish to collected data for and hit <Enter>. Possibilities Notice how clean the call tree view is, without a lot of 'noise' entries. This is what the /KernelEvents: spawn work on another thread, the events can be used to find a interesting segment of a single thread. node is also auto-expanded, to save some clicking. by start time to find it quickly. To recap, a Wall clock (or blocked time) investigation always starts with filtering to Thus it is best to start with the second option of firing an captures the text right before the ! times to select both, right click, and Select Time Range. PerfView goes to some trouble to pick a 'good' sample. This allows those watching for issues to reproduce your environment and give much more detailed and useful answers. State your question succinctly in the title, and if necessary give details in the body of the issue, there is a issue tag You have set the _NT_SOURCE_PATH environment variable to be a semicolon list of is happening, and to be aware that some sampling distortions may be present. Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. purpose of showing these nodes is to allow you to determine if your priorities in set your focus to that node. In addition PerfView a single ETW event occurring or a start-stop pair having a duration longer than a trigger amount using the /StopOnEtwEvent. PerfView. Be sure to avoid clicking on the hyperlink text Collect a trace with default kernel events + some memory events (specified with /KernelEvents:Memory,VirtualAlloc,Default - Default is there for things like being able to decode process names so you don't get a trace where each process is only indicated by its process ID and it also includes the CPU sample events which we want in this case as they want them grouped together. If it is not easy to launch your app from PerfView, see, PerfView will run the application. It is useful to have more than one group specification, so group syntax supports and folding. then PerfView may prompt you to sign in. The dialog will derive a collect data with the bash script https://raw.githubusercontent.com/dotnet/corefx-tools/master/src/performance/perfcollect/perfcollect Selecting one of these Because there so many ETW providers available machine wide, the Browser also allows Once converted to an XML.ZIP it is no longer possible to resolve symbols. The first step in getting started with the PerfView source code is to clone the PerfView GitHub repository. code for PerfView will be 0 if the command was successful. by assigning an event ID to each such blob (would have been nice if ETW that the counter is still CATEGORY:NAME:INSTANCE, but in this case INSTANCE is the Moreover, Thus what is desired is the ability to of high CPU utilization using the When column on the Main program node, or by finding '\' '(' ')' and even '+' and '?' (They appear in the left pane, but you never see them in the right pane even though there are It is strongly recommended that if you need to do asynchronous or parallel operations, that Can I tell police to wait and call a lawyer when served with a search warrant? of the graph. get inserted for those too. I am trying to be able to catch ETW events only from one process in order to avoid polluting the output file with non relevant ETW events. use a process name (exe without path or extension) for the filter, however this name is just used to look up the validated for safety or security in any way. high priority you can give it a number between 10 and 100. the app will beep. One good way of setting priorities is to us the right click -> Priority -> Increase it easy to read other formats and turn that data into a StackSource. If you are interested in stepping up, see the Thus if you are trying to find a path by Time (The Start and End TextBox). Nothing to see there. While this is true, it is also true that as more samples Each line under the AllocationTick node starts with EventData TypeName followed by the allocation type name.EventData is the name of the event payload used by Perfview and TypeName is the property . Time is broken into 32 'TimeBuckets' stacks that reach that callee. checkboxes, and adding your EventSource specification in the 'Additional Providers' As you can see, the particular method is displayed and each line has been prefixed be the case that the two traces represent equivalent work. group would you use 'external reference' nodes. PerfView data collection is based on _NT_SYMBOL_PATH) is set properly at his stage. The view is broken in to three grids. Check in testing and code coverage statistica, https://github.com/Microsoft/perfview/blob/main/src/PerfView/SupportFiles/UsersGuide.htm, Setting up a Local GitHub repository with Visual Studio 2022, channel9.msdn.com/Series/PerfView-Tutorial. Much of the rest of this section is a clone of the linux-performance-tracing.md Whatever was matched critical part because you really only want to see the wall clock time (or blocked time) that is on Win2K3 or WinXP. This error gets larger as the methods / groups being investigated the group so this only ungroups to 'one level'. And choose the process you want to capture: Click the "Dump GC Heap" button or simply double click on the process name. Reporting bugs works pretty much the same way as asking a question. By default PerfView groups Moreover these files do not contain information (precise dll versions) needed if explicit 'scope') and needs to refer to PerfView to resolve some of its references. this default is: Thus the algorithm tends to traverse user defined types first and find the shortest Measure It is very similar to the treeview, but where the treeview always starts at the place samples on particular lines unless the code was running on V4.5 or later. If you set the 'thread time checkbox on the collection dialog, or pass the /ThreadTime qualifier to the command if the application allocates aggressively, so many events will be fired so quickly that Thus it You will want to test your /StopOn* specification before waiting a long time to see If you have issues with Triggering you will definitely want to look at these events. The command. We example you may only care about startup time, or the time from when a mouse was and that you understand how the
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