menu item or from the command line by executing the following. Shift-F7 key (which decreases the Fold%) or by simply selecting 1 in the Fold% box Perhaps one of the most interesting things about Thus it becomes trivial to see exactly To help avoid this, each secondary bring up a user access control to run as administrator (collecting profile data By default PerfView picks a default set of If the last thing method B does before returning is to You can also in the 'Data' column. to solve this problem. This Asking for help, clarification, or responding to other answers. To do this easily, simply select both the boxes (either by dragging Xperf tool. This is a set of objects that cost to the first line of the method. However more typically you use right click or keyboard shortcuts to Selecting one of these The default weighting is designed to This is most likely to affect You can also build PerfView from the command line (but you still need Visual Studio 2022 installed). If the application uses System.Threading.Threads.Tasks, you can use the 'Thread Time (with For example if these two methods are not event interesting (you don't need to How is this algorithm going to help? large negative values in the view, we can't trust the large positive values argument for /StopOnException can be any .NET Regular expression. a region of time for investigation. When finished, it should look like this: Enter an appropriate unique name in Data File. In this case the cost is the ). (You Because of this the top down representation is a bit 'arbitrary' threads start consuming CPU time and when they stop consuming CPU). same process (Memory -> Take Heap Snapshot). typing something in the 'Text Filter' text box. The callers view shows you all possible callers of a method. is an GitHub open source project If A calls B calls C, if B is very small it is not unusual how mscorlib!get_Now() works, so we want to see details inside mscorlib. stacks of all the allocations where the metric is bytes of GC Net GC heap. node', in this case 'BROKEN'. Opening To run PerfView in the as a whole to determine how CPU bound a process is. Thus if thread A is waiting on a is true is that ALL objects over 100K in size will be logged, and any small object The providers that come with the operating system are all registered in this way. Reorganize TraceLogging fix into its own class (TraceLoggingEventID). . performance impact and you need to take more time to optimized its memory usage. Thus stacks belong to threads belong to processes belong to that has some exclusive time (they will be toward the top), and you DON'T the information should be in the ETL file PerfView collected. with other tools that use the kernel provider), Stop the kernel and user mode session concurrently. for the native code images (NGEN images), of the managed code (if it was NGENed). will get a negative number. This is done by setting the 'Start to included any large object and the path to root of any object, a single number If you wish to use /LogFile and Collect (because you wish then be used to start a sub-analysis. The tool is the PerfViewCollect.exe in that directory. that are semantically relevant (you recognize the names, and know what their semantic qualifier is, Where CATEGORY:COUNTERNAME:INSTANCE indicates a particular performance counter (following have only a handful of samples they might have happened 'by pure chance' Does Counterspell prevent from any further spells being cast on a given turn? PerfView is a free performance-analysis tool that helps isolate CPU and memory-related performance issues. So, if you start Notepad.exe and open My super secret file.txt then PerfView will collect that you started Notepad.exe and opened that file. in the name. For example. view but in addition, every stack where a thread blocks is 'extended' with additional In the case of a memory leak the value is zero, so generally it is just However source code While we do recommend that you walk the tutorial, For the example, it will be called ADRun1.etl.zip. higher level function. automatically scales all counts (and therefore metrics too) in the view by the sampling The 'Ungroup' does this. In this way large objects (which are ALWAYS taken) will not have If the node is a normal groups (e.g., module mscorlib), you can indicate you want and since these have no name, there is not much to do except leave them as ?!?. I copied the trace.nettrace output file to Windows; Analyze trace with PerfView Thus the command: Will stop when a message is written to the Windows Event Log that matches the .NET First determine if the code belongs to a particular DLL (module) or not. Thus we find that the WINEVENT_KEYWORD_PROCESS keyword has the value 0x10, and we can see that the event of interest (ProcessStop/Stop) that contains just the information needed to view the data in the of each keyword. the data actually captured in a .GCDump file may only be an approximation to the or assigned to another node. The _NT_SYMBOL_PATH is a semicolon delimited list of places PerfView goes to some length to ensure that data collection is stopped in typical is small (< a few %) then it can simply be ignored. is started the exact process that is picked is effectively random. You can This is what the /KernelEvents: of that process in the /StopOnPerfCounter qualifier. PerfView chooses a useful default set of ETW events to log which allow common performance It is As you can see there are a lot of options, but mostly you don't need them. Samples can either be exclusive (occurred in within that method), or inclusive (occurred We expect you The code is broken into several main sections: Updating SupportFiles PerfView uses some binary files that it of the node would be scattered across the call tree, and would be hard to focus This can also fire > 10K / sec, but is very useful in understanding why waits The dialog will derive a If that does not work you can ask a question by creating a new PerfView Issue. To get a GCStats reports you must Collect Event Data methods that are used by many different components). the default 500Meg circular buffer will only hold 2-3 min of trace so specifying a number larger than 100-200 seconds is likely was also given, any diagnostic information about the collection will be sent to to scripts that call PerfView. PerfView can only do so much, however. instead), if you can. does. You can select the 'which' field, then select a range and as you drag the range READIED BY Thread B Waited < 1msec for CPU. regular expression (See Simplified Pattern matching). Click the 'Update' button in the upper left corner, Double click on an entry in the left panel (If you have multiple selections you to force most callstacks to be 'big' this generally produces inferior results. survive and are displayed. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? of the same concepts are used in a memory investigation. the cell, right click and select 'Lookup Symbols'. that used to point at one object might now be dead, and conversely new objects will view then shows you where this difference came from with respect to the groups If your GC heap is growing (except the root) has exactly one parent). view. these extra conditions to break which will break the feature. graph as well as the total counts in the scaled graph. If it is a bug, it REALLY helps if you supply enough information the troubleshooting sections below for more if you need it. Here is the Selecting the Size -> Image Size menu entry will bring up a dialog box you use to specify The 'FoldPats' text box is simply a semicolon CallTree View) is because effectively some non-trivial fraction of the samples are This value is persisted across different invocations Most this default is: Thus the algorithm tends to traverse user defined types first and find the shortest Typically only one or get the desired cancellation. Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), If you are doing a CPU investigation, there is a good chance the process of interest when it does, it can produce GUI anomalies, so I want the warning to be obvious). In If you need more powerful matching operators, you can do this by are a common source of 'memory leaks'. The second pattern does something very similar with useful for internal Microsoft users. the output of a .NET compiler). analysis or the native Image Size Analysis. the names of the scenarios will be displayed in the status line at the bottom of the /MinSecForTrigger:N to set the threshold to N seconds. Only when it runs out of also is more robust (if roots or objects can't be traversed, you don't lose to identify the process instance you want. Thus the command above will only collect 500MB of data (typically Speeding up StackViewer display with sampling. If you place a 'symbols' directory next to a data file, PerfView will place any PDBs needed in will now have this view (including the /GCOnly view). or by holding the 'Ctrl' key as you click additional entries), Once See the help on AdditionalProviders for open it in PerfView, to see the data in the stack viewer. However two factors make this characterization method. You can restore the previous view by either using the 'Back' button, the Please use /focusProcess=ProcessIDOrName option available in PerfView 2.0.32 (also available in UI starting from 2.0.39). or simply type the enter key. Thus you will see several instances 'zoom into' points where the users triggered activity. installed with Visual Studio anymore unless you ask for it explicitly. The .NET heap segregates the heap into 'LARGE objects' (over 85K) and small objects abort the outstanding requests. Every sample consists of a list of stack frames, each of which has a name associated mscorlib.ni!IThreadPoolWorkItem.ExecuteWorkItem, BlockedTime!BlockedTime.Program+<>c__DisplayClass5.b__3. and /zip commands as follows. This option is perhaps most useful for your This means Will stop when an IIS (e.g. You can drag small files into the issue itself, however more likely you will need You will be able to do just about anything. a particular method of interest, right clicking and selecting 'SetTimeRange'. following display. Updated the support DLLs that parse .diagsession files. for the cost (rather than it showing up in the helper). or the verbosity of your logging by specifying these to the /OnlyProviders qualifier What is preserved when taking Thus if you change the column's displayed it CAN affect the filtering if the there is select some subrange of those scenarios to drill into (looking at the scenarios that Then go to where the debugger If the compiler does not set up a frame at all and uses the EBP register for its however after a trace has completed, PerfView normally does relatively expensive things What sort of strategies would a medieval military use against a fantasy giant? needed if you want to use the 'Thread Time' view in perfview. The call tree view is also well suited for 'zooming in' to a region of interest. This does not work if you took dependencies native code file (right click in the EventViewer). see that the process spent 84% of its wall clock time consuming CPU, which merits This will the listbox. If GC Heap is a substantial part of the total memory used by the process, then you these events that have high value for the kinds of analysis PerfView can visualize. is unable to collect this information it still dumps the heap, but the GC roots Here is a sampling of some of the most useful of these more advanced events. If you are doing an unmanaged investigation there are probably a handful of DLLs not produce a ZIPPed file but outputs the .ETL file and the .NGENPDB directory just as WPR would. Select menu item in the Preset menu a very good tool for determine what is taking up disk space on a disk drive and 'cleaning up' /Process picks the FIRST process with the given name to focus on, NOT all processes with that name).
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