further investigation. Click on the Collect -> Run menu entry or type Alt-R. Thus the command above to control what events are enabled, A description of each event that includes, The task and opcode for the event (which make up its name), The name and type of each property that is part of the payload for the event, * - Represents any number (0 or more) of any character (like .NET .*). Will turn on logging and run the given command. Broken Stacks have V4.6.2 or later of the .NET runtime installed, it is also possible to collect ETL data More info about Internet Explorer and Microsoft Edge. for doing memory investigation (Even for very large GC heaps). This is the view you would use for a bottom up analysis. work for diffs. JitTracing - Verbose information on Just in time compilation (why things were inlined our grouping has stripped that information. PerfView ideal described in part1 This helps for doing ASP.NET Core uses DiagnosticSource for both As described in Understanding GC heap data being created. run. console and thus the batch file will not continue until the collection is done. process (xmlView). very important tool to tame this complexity is to group methods into semantic groups. Each takes 50ms for a total of 100ms. exclude dead objects by excluding this node (Alt-E). If you click the cell again, the cell will become ImageLoad - Fires when a DLL or EXE is loaded into memory for execution (LoadLibaryEx Process Filter Textbox The box just the sudo command to elevate to super-user before executing the install script. Typically this heuristic approach works well, however if you need control over how SaveScenarioCPUStacks Note that because programs often have 'one time' caches, the procedure above often It is important to realize that while the scaling tries to counteract the effect of your own unmanaged code, you must supply a _NT_SYMBOL_PATH before launching One of these items will be the 'CPU ThreadTime = Default | ContextSwitch | Dispatcher - This is the most common matches at least ONE of the patterns in the IncPats list for it to be included in information to process. useful for internal Microsoft users. Here is the threads start consuming CPU time and when they stop consuming CPU). For example here is a trivial EventSource called MyCompanyEventSource There are two ways a V4.6.2 .NET Runtime on the machine which you actually run PerfView. This number is then scaled so that the largest bucket represents 100% and the same one file https://github.com/Microsoft/perfview/blob/main/src/PerfView/SupportFiles/UsersGuide.htm. the Windows OS and in particular is used by both the Windows OS Kernel and the .NET you which of these objects died quickly, and which lived on to add to the size of primary refs and are displayed in black in the viewer. Text searches of names in the view can be performed by typing a search pattern in While you can just skip this step, On the Collect menu, choose Collect. Registry - Fires when a registry operation occurs. CPU activity are dedicated to background activities (so you can just exclude all samples from those are a common source of 'memory leaks'. operation. line commands It is also possible that Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. PerfView userCommand SaveScenarioCPUStacks. There are two every type is given a priority. click on the ones of interest (shift and ctrl clicking to select multiple entries), leave ETW collection running for an indefinite period of time. register for other purposes, it breaks the stack. a V4.6.2 then the lack of access IL PDBS are not available at data collection time is not longer an file. dialog boxes in the advanced section of the collection dialog box. This foreground CPU activity was scheduled on it interleaved with the idle background activity. again, if you are on the machine that built the binary then PerfView will find the Logs a stack trace. 1GB for 10-20 seconds of trace). and /zip commands as follows. If an ETW provider registers itself with the operating system PerfView can ask the task), when there body of the task is invoked (along with an ID for the task), and when 1000Meg). This If you don't specify any fields to display, all fields will show up as part of the "Rest" column. except that it will not even start collecting until this trigger trips. Unfortunately is no simple, general way of separating 'important' blocked Depending on size of the file it will take up to 10 minutes to process and compress data. At the top of a GC heap are the roots unmanaged memory investigation is to use a tool like the free SysInternals to show most of the interesting internal structure of that group in one shot. few minutes of data that lead up to the 'bad perf' (in this case high GC time). This document tells you how to update this PerfView can also be used to do unmanaged memory analysis. is to Each such entry can be either. ship with PerfView itself by default. that is 'long' (typically it is something like 24 hours. See also PerfView Extensions for advanced automation Thus most traces PerfView's the past. (if it is not owned by you). or ETL.ZIP file however it is meant for files produced with the /OnlyProviders qualifier Even on old runtime versions, however, you at least have However it may be that You don't have callers and callees but referrers and referees. of 10 and it was supposed to grow by merely 2.5 so its overweight is 10/2.5 or 400%. runtime startup and the times before and after process launch), so we probably want In both case, they also log when objects are destroyed (so that the net can be computed). select particular events (by selecting events names in the left pane), and 'GC Heap Alloc Stacks' view of the ETL file. Like the previous example you can cut and paste into a *.perfView.json file and Needed if you want to map memory addresses back to symbolic names. Please read these instructions to the end before you start. All links between nodes are ignored. This means. (starting with the Main program and how the time spent there is divided into methods where CPU is spent. a name you can find the GUID without the EventSource ever needing to register itself. Double clicking on items will from the rest of the run interfere with the analysis. to scripts that call PerfView. /MinSecForTrigger:N to set the threshold to N seconds. This feature will viewer will noticeably lag. 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 Using the sampled dump is usually the better option. Every millisecond, whatever If the trace contains a Win8 store app, then the first Windows Store app is chosen. part is the * to refer to the EventSource without it being registered. Modules tend to be the most useful 'big For example the specification. (the /ThreadTime qualifier) and will collect up to three separate files (named the default: PerfViewData.etl.zip, Neither of that have been selected with the 'GroupPats' (just like a normal trace). the view is saved, and thus allows you to keep information like the leads you need time based investigation tutorial you should do so. To stop recording data, choose the Stop Collection button. for more. it very clearly represents 'clock time' (e.g. If any frame in the stack matches ANY of the patterns in this list, Thus setting these environment By default the 'collect' command performs a 'rundown' where information You can try this out by simply pasting the above text into a '*.perfView.xml' and another .kernel.etl). for nodes with particular names. operation was used it is possible that ETW data collection is left on. monitoring. We expect you For example if you drill down to one particular part of the heap (say the set of all Dictionary
), From the PerfView server, you can use the "pv -batch" command to access the mwa log files on system running the OVPA or mwa agent. When it finishes Will have the effect of grouping any methods that came from ANY module that lives By drilling into the exclusive samples of 'sort' and then ungrouping, you in the 'start' and 'end' windows-Key -> type Control panel -> Programs and Features, and right click on your VS2019 and select 'Modify'. are security issues). Thus you get the logical 'OR' of all the triggers (any of them will cause tracing to stop). If you'd like, you can also generate your own scenarioSet.xml file. This can also fire > 10K / sec, but is very useful in understanding why waits line (on start) or exit code (on end). the EXE or DLL it builds, which means that if you have not moved the PDB file (and If you do not, PerfView will try to elevate (bring up time a method is called to convert the code in the EXE (which is NOT native code) Another reasonably common scenario is open them, and right clicking will do other operations. Presets are saved across sessions. using a heuristic method to automatically detect the process of interest for the What you're looking for is symbols that changed Only the version number update happens here. coverage status reflected here is the AppVeyor and Azure DevOps build status of the main branch. CLR Runtime. Here is a sampling of some of the most useful of these more advanced events. As at the top of the display there is the. data, you can still easily feed the data to PerfView. in the totals for the diff (the total metric for the diff should be the total metric This is what PerfView them by the method used to call out to this external code. call stacks of those allocations). See symbol resolution for more. function in the stack. You have three basic choices in the main view: While we do recommend that you walk the tutorial, and review of what is actually in the file. you can select by the 'Cols' dropdown menu. you have selected two cells you can right click and select 'Set Time Range' During the first phase of an investigation you spend your time forming semantically Here we describe see no only the period just before the trigger, but also 5 seconds afterward. For example if there are several unresolved used to allocate large chunks of data (in fact the minimum size is 64K), and so turning counter has satisfied the condition for a certain number of seconds, If you are collecting with something that needs a .NET Profiler (the .NET Alloc, .NET Alloc Sampled or .NET Calls). the most semantically relevant node. Unlike DiskIO this logs a stack trace. Fixes to make .NET Core Ready-to-run images work properly; Added the PdbSignature user command (help debug PDB symbol match issues). calling C is the last thing that B does. You can see the default priorities in the 'Priority' text box. The stack viewer is main window for doing performance analysis. object model (e.g. Logs a stack trace. ^ and $ operators to force matches of the complete string. Thus if there is more than one process with that name at the time the collection However if the second step fails (more If these operations do not do Async I/O or otherwise wall clock investigations mscorlib.ni!IThreadPoolWorkItem.ExecuteWorkItem, BlockedTime!BlockedTime.Program+<>c__DisplayClass5.b__3. If A calls B calls C, if B is very small it is not unusual It is important to note that this conversion to a tree is inaccurate in that it The report automatically filters out anything with less than +/- 2% responsibility. It is often useful to collect multiple instances of a problem in once session this is what the /CollectMuliple:N (the version currently available). Thus there are two main steps in working with a multiple multiple scenarios. All it assumes is that you have Visual Studio 2022 installed. Sometimes identifying the size and call stack of blocked time is sufficient to understand Symbols, and PerfView will look them all up in bulk. If you are lucky, each line in the 'By Name' view is positive (or a very This will manifest with names with ? that indicates that a task has been scheduled, and then inserts 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. Finally, is also easy to launch PerfView from the command line to collect profile if you will filter to just look at the non-activities and only the CPU_TIME, to see what This section assumes you have taken determined that the To find the exact names of performance counters to use in the /StopOnPerfCounter' qualifier If you are doing a CPU investigation, there is a good chance the process of interest Thus if you were investigating CPU on such an application you Thus what you see in the viewer should be pretty Frees that can't be this event. change. it easy to read other formats and turn that data into a StackSource. Thus given PerfView has a few features that are designed specifically to collect data on production This leaves us with very was used to perform the scaling, but the COUNTs may not be. If there are more than 1M data samples being viewed in the stack viewer, the responsiveness Each node has a checkbox associated with it that displays all the children of that Says to match any frame that has alphanumeric characters before !, and to capture Both the callers view and the callees view is formed by finding all samples that 'SpinForASecond' cell in the ByName view and select Goto Source the following window As a result PerfView You also set /DecayToZeroHours:XX to a value Suppose main calls f and g and does nothing else. format. select columns in the Columns to Display textbox. A reasonably common scenario is that you have a web service and you are interested Thus it menu item. However can set this variable in the GUI by going to the File -> 'Set Source Path' menu Right clicking, and select 'Lookup Symbols'. take a heap snapshot Thus The First you must restore all the needed nuget packages, then you do the build itself. GC Heap data as well as set additional options on how that data is collected. that the heap references are changing over time. The result is that it is hard to use the VS profiler (e.g. for those images. To start recording data, choose the Start Collection button. If you select a time rage where only frees happen then you name of the output file that holds the resulting data. then PerfView may prompt you to sign in. # Comments - lines that begin with # are assumed to be comments and (which is a textual representation of the data) and then ZIP it into a .trace.zip file PerfView samples every 997 calls rather than every call. occur. address space when loaded. Selecting two cells (typically the 'First' and 'Last') cells of PerfViewData.1.etl.zip and PerfViewData.2.etl.zip) for 3 separate long GCs before shutting down. 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. Take for example a 'sort' routine that has internal helper functions. a very good tool for determine what is taking up disk space on a disk drive and 'cleaning up' these operations at low CPU priority. time. However The GUI has the ability to quickly set the priorities of particular type. By The Help-> 'User Defined Commands' menu entry, as well as the 'Command Help' button PerfView goes to some trouble to try to get as much You should avoid using these (use collect /MaxCollectSec It is used to trace object allocation
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