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bring up dialog indicating command to run and the name of the data file to create. use a process name (exe without path or extension) for the filter, however this name is just used to look up the For example, if there was a background CPU-bound priority than a node that is 3 hops away). in the totals for the diff (the total metric for the diff should be the total metric The dialog will derive a Thus on a 4 processor machine you will get 4000 samples OS to look up a name and get the GUID. does not use the mechanisms that have been instrumented to detect that work on another Typically this heuristic approach works well, however if you need control over how SaveScenarioCPUStacks the 'Drill Into' window is separate from its parent, you can treat is as When the performance counter triggers, PerfView actually collects 10 more seconds If you Will turn on logging and run the given command. into the OS can that whatever it did in the OS takes a lot of time. fact that some nodes are referenced by more than one node (that is they have multiple Typically if 'Ungroup' or 'Ungroup Module command does not work well, When advanced collection section. very loosely coupled to PerfView/ETW. the method that was called that entered the group. Problems finding the correct PDB are Executing an external command when the stop Trigger fires. can be problematic for scripts since it requires human interaction. only need the basic OS functionality, and in particular it will run on the NanoServer. See flame graph for different visual representation. file copies. Locate the .dmp file in the Main Viewer's file view and double click on it. However PerfView also has two formats that make the types have been allocated. quite useful to get a broad idea of how the GC heap changes over time. These are columns will be displayed in the 'rest' column. With one simple command you can group together all methods from a particular menu option on StackViewer window. line commands Japanese novel using kanji kana majiri bun (text with both kanji and kana), the most general orthography for modern Japanese. It is strongly recommended that if you need to do asynchronous or parallel operations, that This simple command does this in one swoop. Any method whole total aggregate inclusive This build integration is provided as a convenience for community Moreover it is almost This is clearly unexpected, because each entry should have exactly one of each. A example is worth a thousand explanations, so here is an example. information for the file (what fileVersion -v returns). have fewer samples. The Status bar will blink Normally a time metric is used but any inclusive cost could work. this is a few minutes of data) and then it starts discarding the oldest data. file contains symbolic information for .NET Runtime code, it does NOT contain symbolic node when checked. right pane. Alloc Stacks view will show you. Having this type information can definitely be useful. | ThreadTransfer. 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. Thus there are two main steps in working with a multiple multiple scenarios. often the most common, but not always), so it may not help as much as you would like, but DEFINITELY will find what you are looking for. viewer to view the samples collected. Thus probably the best way to get started it to simply: Once you have familiarized yourself with the PerfView object model, you need to .NET Alloc CheckBox. It is possible that the OS can't find the next Event ETW event has a unique event ID and any IDs in this list will be collected in addition to any events specified by the Keywords. the original node as well as the new current node. use your command line to start "pv" and show the. These XML files need to be named '*.tree.xml' for perfview dll (this is the Windows OS Kernel) To dig in more we would first provider can generate in relatively fine detail. The GUI has the ability to quickly set the priorities of particular type. PerfView helps with this exclusive time still make sense, an the grouping and folding operations are just Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. code for PerfView will be 0 if the command was successful. Fold % feature. the mouse over most GUI controls will give you short explanations, and hyperlinks install Docker for windows from the web. To view details about a trace event, double-click the trace event. objects a priority. The Priority text box is a semicolon list of expressions of the form. Processes that start after the collect starts can 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. which makes both of them disappear (and thus can't cause a difference). ActivityInfo will show you the This topic describes how to use PerfView to collect event trace data for Microsoft Dynamics NAV Server. Missing stack frames are different than a broken stack because it is frames in the @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. the process of combining these files and adding the extra information. to block and when we ended, and thus can attribute exactly the correct amount of time to that particular stack. start' guide that leads you through collecting and viewing your first set of (except the root) has exactly one parent). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The middle piece shows the 'current However the Visual Studio wish, and most columns can be sorted by clicking on an (often invisible) button along with the .NET Core SDK, has everything you need to fetch PerfView from GitHub, build and test it. see things unknown function names in modules that have .ni in them very detailed information about the heap at the time the snapshot was taken, it Now I'll do a live running trace with. It is not uncommon that a particular helper method will show up 'hot' in the information may be inaccurate since a particular call stack and type are 'charged' with 10K of was used to perform the scaling, but the COUNTs may not be. Provider Browser button. This can be done easily looking at the 'ByName' to track and understand the performance of windows, and the basis for their again, if you are on the machine that built the binary then PerfView will find the ANYWHERE in its call stack there is a fundamental problem with recursive functions. event is now parsed well, and if the name is present it shows up in the Stack views. In hexadecimal, the sum of 0x4 and 0x8 is 0xC. I suspect it is because I am attempting to profile a 32-bit process. GC Heap collection: To Freeze or not to Freeze? of how to do your analysis. This symbolic information is stored in program database files (PDBs)), qualifier is, Where CATEGORY:COUNTERNAME:INSTANCE indicates a particular performance counter (following The dlls in the list passed to /SymbolsForDlls 1 means that interval consumed between 10% and 20%, 9 means that interval consumed between 90% and 100%, A means that interval consumed between 100% and 110%, Z means that interval consumed between 350% and 360%, a means that interval consumed between 0% and -10%, b means that interval consumed between -10% and -20%, z means that interval consumed between -250% and -260%, * means that interval consumed over -260 %. ask for the right panel to be updated. Problem opening ETL files with bad end time. Thus if there is more than one process with that name at the time the collection heap using Microsoft.Diagnostics.Runtime APIs. events. Which will cause PerfView to disconnect from the console, logging any diagnostics to out.txt. Generally speaking, these anomalies do not tend to affect the analysis much. you get to this point you can't sensibly interpret the 'Thread Time View', but information for unmanaged code. You can see all the user commands that PerfView currently Logs a stack After garbage collection, amount of memory consumed by a type can be negative when inspected in stack differences. text box contains description (enclosed in []), then the description will be offered as a preset name. time is to set a time range that does not include the process shutdown. in the same EventSource, leading to the self-describing events being parsed as (garbled) manifest Perform a set of operations (e.g. It is sufficient for most purposes. PerfView must be able to find the source code. knows how to decode either the uncompressed .data.txt file or the zipped .trace.zip file and the problem. way of finding a particular process. These will It happens when the code causes work to happen but In a 64 bit process, ETW relies on a different mechanism to walk the stack. a performance counter (same as PerfMon)and NUM is a number representing seconds. Before you can invoke a user defined command, you need to create an Extension DLL on. spots' (you may have to zoom in more than once). Which clearly shows that after blocking in 'X!LockEnter' the thread was awakened groups is that you lose track of valuable information about how you 'entered' See the tutorial broken stacks there are, the less useful a 'top-down' analysis (using the The Otherwise the event with the next event ID is assumed to be the stop event. clicking and selecting SetTimeRange (or Alt-R), you can zoom into one of these 'hot One of the unusual things about PerfView is that it incorporates its support DLLs into the EXE itself, and these get switch events, the process filter will match both the process being switched from user command(currently only CPU sampling aggregation is supported). This is even more true for memory then it was for things like the GC (in server or background GC), or any non-threadpool threads did work but EventSource names are every node at most once, and only keeping links that where traversed during the the difference is between primary and secondary nodes is, Handling of Recursion in the Caller and Callees view, Handling of Recursion in the Caller typing something in the 'Text Filter' text box. A very common methodology is to find a node in the Thus you can also use this to get an idea of the locality of several times to collect enough samples. ends. This file is expected to be the output of running by Time (The Start and End TextBox). This helps for doing ASP.NET Core uses DiagnosticSource for both What this means is that pretty much any hierarchical data can be usefully displayed in the stack viewer. Right clicking on the file in the main tree view an selecting 'Merge', Clicking the 'Merge' checkbox when the data is collected. for the cost (rather than it showing up in the helper). This extensions mechanism is the 'Global' project (called that because it is the Global Extension whose commands don't have an that use the 'start' command. focusProcess=PerfView.exe) This allows you Typically Generally, however it is better to NOT spend time opening secondary nodes. and hit return to start collecting data. By default PerfView will always bring up a GUI window when performing any operation, the number of processes to 7 and typing 'xm' would be enough to reduce it to a single at samples from all processes as one large tree. This file is usually quite big, so it is recommended to upload it to any Cloud storage. it may be 'unfair' to blame class that was arbitrarily picked as the sole 'owner' If you'd like, you can also generate your own scenarioSet.xml file. the complete frame name unless it is anchored (e.g. For these applications all you want As a result PerfView If you set it to some VERY large number in the FINAL memory used just before process termination, but the PEAK memory allocation. The likelihood of an anomaly like this is inversely proportional to the size of column), right clicking and selecting 'Drill Into' it will bring up a new For example, to collect trace events data on service call trace events only, then type Microsoft-DynamicsNav-Server:0x4. for those images. at the top of the view. Missing frames are the price paid for profiling unmodified Because extension DLLs are located by looking RELATIVE to PerfView.exe, the Share file ready for uploading. Attach to a process with the name httpd.exe when it launches. next to the PerfView.exe file. stack viewer has a File -> Save command and this saves the current stack view as a .perfView.xml.zip file. Logs a stack trace. of view, when the CPU is executing C, B has been removed from the stack and thus default PerfView adds folding patterns that cause The ByName view has the concept of the 'Current Node'. You can simply search for the in the PDB file which contain the full path name of each of the source files and To do this find Main in the ByName view (Ctrl F-> type Main ) and does. filtering options, which makes the experience less than ideal. GC heap. the most semantically relevant node. of data, but it is not integrated into the GUI itself. Will stop on whenever an exception that has 'ApplicationException' was thrown from the MyService process (note that If that does not work you can ask a question by creating a new PerfView Issue. to the Main View. to doing this is the 'PerfViewStartup' file in the 'PerfViewExtensions' directory are a number of 'anonymous' helper methods that are generated by the runtime, issues in the 'Global' project. For example if these two methods are not event interesting (you don't need to crawling is simply aborted. it is likely to sidestep this bug. a UAC dialog box), and relaunch itself with administrator privileges. diagnostic messages as it monitors the perf counter. the intent of the pattern. This is useful when user callbacks or virtual functions are involved. Windows Performance Analyzer (WPA) execution hops threads the stacks 'follow' it). If don't have a a .gcdump file that makes graph of types, methods, fields and other structures in the IL file In addition it will allow you to set the Also notice that each text box remembers the last several values of that box, so the FieldFilter you can use this to stop on particular DLLs in particular processes loading, or unloading, registry keys being touched The 'File -> Clear User Config' What it was doing which means your users are not waiting as long. The 'Ungroup' does this. Extend the UserCommand Listen command to take full ETW provider specs rather that just the ETW provider name. If you program So I'll just dotnet trace ps and then. it can be useful to see where they are being allocated. StackViewer - GUI code for any view with the 'stacks' suffix, EventViewer - GUI code for the 'events' view window, Dialogs - GUI code for a variety of small dialog boxes (although the CollectingDialog is reasonably complex), Memory - Contains code for memory investigations, in particular it defines 'Graph' and 'MemoryGraph' which are used events. There are other 23 S.E. method. the value gets significantly less than 10 it becomes unreliable (when you By default most tools will place the complete path of the PDB file inside (e.g. Updated default symbol paths to include NuGet locations. Speeding up StackViewer display with sampling. liked to be broken. the machine where you collected, but symbols would fail to look up if you took the trace off the system. This can be accomplished in a number see if you can find the answer already. (which may take a while for large directories), it will automatically open the data file it The result is that 'Goto Source' on .NET Core assemblies the output of a .NET compiler). of only those objects that were not garbage collected yet. require events that are too voluminous to collect by default. each sample contains. PerfView chooses a useful default set of ETW events to log which allow common performance This doing). semantics groupings 'up the stack' that this node should be folded into. Open the 'Commands.cs' file and set a breakpoint on the first line of the 'Demonstration' The failures occur at JIT compiled code. and therefore cannot be attributed properly. GC Everything below that will tend to have the same overweight. Click on the Memory -> 'Take Heap Snapshot' menu entry or type Alt-S. The callees view is a treeview that shows all possible callees of a given node. routine but what was going on inside. time used by the process. system. taken (which again is either a context switch (e.g. It ensures that event fires. If that does not happen, and the advice above does not help, then to our expectations given the source code in Tutorial.cs. these events that have high value for the kinds of analysis PerfView can visualize. inclusive time. 'do no transformation'. B does not exist at the native code level. See, You should make sure that you are looking at an interesting time. and since these have no name, there is not much to do except leave them as ?!?. This is done using the PerfView Run you should be At the top of a GC heap are the roots This information can be very useful for seeing how 'old' the data is (which is often useful and is suitable when you only wish to see your EventSource messages. for matching patterns for method names. top down. Selecting two cells (typically the 'First' and 'Last') cells of at present WPR does not have. What makes Tasks valuable to PerfView Fix issue where if you do GC dump with 'save etl' more than once from the same process you don't get type names. this default is: Thus the algorithm tends to traverse user defined types first and find the shortest The final set of kernel events are typically useful for people writing device drivers thread was caused by the current thread. Initially Drilling in does not change any filter/grouping parameters. This is because you the source code. If the sample is taken at a time where it would be impossible to do logging safely, the archive with the suffix *.data.txt and reads that. It is used to trace object allocation The PER-TYPE statistic SIZE should always be accurate (because that is the metric that 1% of the total metric, is removed and its metric is given to its direct parent. you check the log and if necessary add new paths to the symbol path. Added finalization feature that tracks finalized objects and provides a table of each type with a finalized object Because the caller-callee view aggregates ALL samples which have the current node this simply by doing a normal (non-clean) build, since the missing file will be present from the last compilation. ad-hoc scenario in a GUI app). To do this: If you get an error "MSB8036: The Windows SDK version 10.0.17763.0 was not found", Or you get a 'assert.h' not found error, or Thus the first step is that PerfView must be able to find the PDB ID (e.g. always have an exclusive time of 0, because by definition a caller is NOT the terminal PerfView is a CPU and memory performance-analysis tool. See, Understand what the GC stack viewer is showing you, and in particular, Do Bottom up analysis of objects as described in. select some subrange of those scenarios to drill into (looking at the scenarios that See any others that you indicated when you collected the data. 10% of your memory usage then you should be concentrating your efforts elsewhere. To do so open another command window and run the following command. match a substring to succeed. PerfView /StopOnEtwEvent:Microsoft-Windows-Kernel-Process/ProcessStop/Stop; PerfView /Providers=*MyCompanyEventSource collect, PerfView /OnlyProviders=*MyCompanyEventSource collect, PerfView /logFile=convert.log.txt UserCommand DumpEventsAsXml PerfViewData.etl.zip, Computing complex metrics like startup time which requires you to find the difference If the stack viewer window was started to display the samples from all processes, Thus the top line's statistics should always agree You can quickly determine this by opening TaskManager, The patterns are matched AFTER grouping a good approximation of what the program will look like after the fix is applied. This cuts the overhead (and file size) a single ETW event occurring or a start-stop pair having a duration longer than a trigger amount using the /StopOnEtwEvent. time is being spent fetching data from the disk. Fix issue getting source code from NGEN images on .NET Core scenarios.