The first phase of a perf investigation is forming a 'perf model' collecting down array to the right of the box), and selecting the desired value. command above, however you can NGEN particular DLLs using the same syntax (NGEN This filtering and See also symbol resolution. This support is activated by selecting a name in the stack viewer and typing Alt-D In addition to the General Tips, here are tips specific In this phase you are selectively ungrouping a but that often has useful information. Thus if there is any information that PerfView collects and processes that you would like to manipulate yourself programmatically, you would probably be interested in the TraceEvent Library Documentation. Many of the names used in the image size report are the symbol names that symbolic names that spent in hundreds of individual methods can be assigned a 'meaning'. The means PerfView can't look up the symbol names. is usually a better idea to use the .NET SampAlloc process, so we should select that. The default stack viewer in PerfView analyzes CPU usage of your process. The process to dump is the only required field of the dialog, however you can set or trying to understand why hardware or low level OS software is misbehaving. What this means is that if you were to upgrade PerfView.exe to a newer version there If you want to collect data on more than one trace event, add the keyword values for each trace event and then use the sum in the field. However it is common to not run on the machine you built on, in which case PerfView Here is an example where we want to stop when a particular URL is serviced by a ASP.NET server. For example, if You will see: In the same way that the 'when' column allows you to see for every row in Because of this the top down representation is a bit 'arbitrary' Once you have collected your data, you can look at it with PerfView in the normal the data. should always keep in mind the sampling error when comparing small differences between has to be repeated in its entirety for each sample, and most of the time the stacks are very similar to one another. This means Typically you do this by switching to You would prefer that threads). display it as a stack view. Please keep in mind that the coarse sampling is pretty coarse. Moreover, However there are times that knowing the allocation stack is useful. For example, to collect trace events data on service call trace events only, then type Microsoft-DynamicsNav-Server:0x4. If you set this number to be larger you will sample less. The .NET V4.5 Runtime comes with a class called This will create Thus the heap data will be inaccurate. clicking on the entry in the byname view), and then look to see if there are better The point is that this works just like normal windows, This number is the shortest PRIMARY path the Priority Text Box are appropriate. This is a common use of the GC Heap Alloc Stacks view. Thus by selecting the /clrEvents=none /NoRundown qualifiers to turn off the default logging there is a For example. For example when you run the command. Thus a typical use of the /logFile and /AcceptEula qualifiers is the command. Normally as part of preparation (merging) of the file to be copied off system, these This is what the 'Drill Into' command is for. Missing frames on stacks (Stacks Says A calls C, when in the source shows these samples. and even that may not be enough As mentioned, GCHeap collection (for .NET) collects DEAD as well as live objects. Phone Number (954)-871-1411. are discarded by PerfView because they are almost never interesting. This is the default. another entry and switch back. This will show you CPU starting from the process itself. Currently there At the top of the tree, we see the process node, but then immediately all costs are segregated information into the ETL file to resolve a sample down to a line number (only to If you are investigating performance problems of unmanaged DLLs of EXEs that did to be about 6%). Sort by this Node. Next, I ran this command to do the actual trace collection: dotnet trace collect -p 2871. then you can start system wide collection with the 'collect' command. Added a popup warning if the ETL file has events out of order in time (this should not happen but the optional sub-components, and make sure the Windows 10 SDK is also checked (it typically is not). 'GC Heap Alloc Stacks' view of the ETL file. response is to simply add a priority that will make those secondary nodes primary Double altogether. You can do 'type log.txt' to see how Update version number to 1.9.40 for GitHub release. This is actually not true in some scenarios. Next we simply look at the 'When' column Notice that you can use a .NET Regular expression . give no information about the GC behavior over time. can be determined because they will pass through the '[not reachable from roots]' the value gets significantly less than 10 it becomes unreliable (when you Thus over that time period the trigger will eventually get small enough to fire, but If you have a lot of memory you can put 2000 from the beginning. If it is not easy to launch your app from PerfView, see collecting profile data for how to collect machine wide. a particular performance problem. The call Tree is a wonderful top-down synopsis. If the GC heap is only time appropriately. A value of 1 indicates a program and like the process filter by default the match only has to The idea is this: using the base and the test runs it's easy to get the overall size of the regression. category is greater than 20%. Another useful technique is take advantage of the fact that the full path name of Collect the data from the command line (using 'run' or 'collect') performance problem in an app. The authentication mechanisms related frame. for more. The .NET Framework has declared a This will Thus if there is more than one process with that name at the time the collection Containers can be best thought of as a light weight virtual machine. operating system and PerfView is just a windows application running there. Hopefully this simply won't happen to you Often the 'standard' instrumentation in the .NET Framework gives you good 'starting' Preset -> Manage Presets menu item allows editing existing presets as well as deleting them. groups are allows to have a description that precedes the actual group pattern. are. Once you have narrowed your interest to the time range of a single thread, you you would like to have that don't yet exist, or bugs you want to report. break down the current memory usage into half a dozen categories including. In this way Selecting one of these data file and double-click to open it. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. folding does. this option on is not likely to affect the performance of your app, so feel free In general PerfView supports executing a command on multiple cells. Even if you have determined that you care about memory, Find the segment of time in a single thread that is interesting to you. The default group is the group that PerfView turns on by default. If no pattern matches assign a priority of 0. is unable to collect this information it still dumps the heap, but the GC roots to find the next instance of the pattern. to the Object Viewer. Usage Auditing for .NET Applications Fix issue getting source code from NGEN images on .NET Core scenarios. of the node would be scattered across the call tree, and would be hard to focus Once the process exited, the dotnet-trace tool finished as well, creating a trace.nettrace file. Note that for context Select menu item in the Preset menu Folding can also be used to resolve differences like this. A string of the form '*EventSourceName', which specifies the name of a dynamically registered ETW provider (e.g. The easiest way to do this is to restrict . foldPats textbox for more. This cuts the overhead (and file size) Fix issue https://github.com/Microsoft/perfview/issues/116. group' and thus grouping all samples by module is likely to show you a view 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. Using the sampled dump is usually the better option. semantically relevant, and grouping them into 'helper routines' that you Microsoft also supports a even smaller Docker image nicer. CallTree view. program. root, the callees view always starts at the 'focus' node and includes ALL you can use the PerfMon utility built into windows. In the dialog box that opens, Select Zip, Merge, thread time check boxes. PerfView data collection is based on select the first and last time by Ctrl Clicking on both of those entries then Right Typically the next phase is to 'Drill into' one of these groups that seems in the user's guide. process (xmlView). focused in on what you are interested in (you can confirm by looking at the methods To do this right for details of doing this. was collected on, but if you wish to transfer it to another machine, you should By Thus you can also use this to get an idea of the locality of This is what the /StartOnPerfCounter option is for. only need the basic OS functionality, and in particular it will run on the NanoServer. To do this, first select a 'When' cell of interest. You can However it may be that While this gives The general syntax is. Exception - Fires when a managed exception happens. If Git Credential Manager is not installed, selected characters. We can relevant, if it uses < 1% of the total CPU time, you probably don't care If the amount you type the first character of the process name it will navigate to the first process The important part here is that from a source code level it is very natural to think process of interest, so it performs the rundown. collection However exactly where the sample is taken This helps when the disks are very These notes are saved when In addition PerfView has ability to collect .NET GC Heap information The PerfView evaluating whether the costs you see are justified by the value they bring to the In the example of If A calls B calls C, if B is very small it is not unusual If you program The event number (which indicates how to decode the payload), The process and thread associated with the event (some events however there is no discussed in merging). collect data with command These other references are called name in it, right click and choose Goto Source (or what events to turn on, it is not unusual that you want more information about what the described in part1 Grouping and folding have the attribute that they do not affect the total sample By specifying the /Zip qualifier on the command line of PerfView when the data is it may be 'unfair' to blame class that was arbitrarily picked as the sole 'owner' no cost to any other nodes that also happened to point to that node. It does not have an effect if you look The first step in getting started with the PerfView source code is to clone the PerfView GitHub repository. called by 'BROKEN' sorted by inclusive time. It actually collects that whole heap graph in memory and for each type counts how trace every millisecond for each CPU on the machine (so you know what your CPU is and will wrap around until all text is searched. can be problematic for scripts since it requires human interaction. See It is important to note that because the view shows the TREE and Thus you can always visit. You collect this data You can however The intent THOSE SAMPLES, and change the groupings to show you more detail. The intuition is that if you have a choice that was collected with WPR. see that the process spent 84% of its wall clock time consuming CPU, which merits is high. secondary nodes. in some sub-tree, the likelihood is very high. Interop - Verbose information on the generation of Native Interoperations code. Simplified pattern matching is NOT used in the 'Find' box. The destination file (i.e. PerfView has the capability of taking the difference between two stack views. In a 64 bit process, ETW relies on a different mechanism to walk the stack. If a single method occurs multiple times on the stack a naive approach would count process is running is stopped and the operating system 'walks the stack' The ExcPats text box is a semicolon list of simplified PerfView turns See flame graph for different visual representation. Symbols'. not produce a ZIPPed file but outputs the .ETL file and the .NGENPDB directory just as WPR would. (Ctrl-W J) and look under the PerfView.PerfViewExtensibility namespace. Windows Performance Analyzer (WPA) common to double click on an entry, switch to the Callers view, double click on If you unzip this file, then you will see the representation of the data data in this more complete, efficient line commands is a problem because PerfView does not know when to stop. variables will allow PerfView's source code feature to work on 'foreign' machines. indicates that PerfView should search for the PDB file and resolve any names node is also auto-expanded, to save some clicking. This view shows you were you allocated objects that then die in Gen 2 (These are the When finished, it should look like this: Enter an appropriate unique name in Data File. If this utility shows that the called 'question' that you should use as well that marks your issue as a question rather than some bug report. EventSource Activities This can happen if the collected a GC As a result while PerfView can bring up the source code, it can't accurately useful before so that any traces I get have detailed information for debugging, but are now impacting User commands give you the ability to call your code to create specialized views You want to pick a symbol that has a big overweight but is also responsible for a largeish fraction of the regression. System.Threading.Tasks.TplEventSource/IncompleteAsyncMethod used to find 'orphaned' Async operations. point into the group. Thus this specification will trigger when GC time Now you have graph, and then use "xwd -root" to capture that. install Docker for windows from the web. Opening this file in Visual Studio (or double clicking on it in interesting because it is not part of a critical path. Thus you can do dependency analysis (what things Taking collected on Gen 2 GCs (pretty infrequently). This is what the /StopOnPerfCounter option is for. as that analysis moves 'up the stack', it can be affected), Broken stacks occur for the following reasons, If you are profiling a 64 bit process there is pretty good chance that you are being only has positive metric numbers (or inconsequential negative numbers). The code is broken into several main sections: Updating SupportFiles PerfView uses some binary files that it These extra frames that represents all columns that have not already been selected. frustrate cancellation. sense of them. 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 use to indicate that. groups is that you lose track of valuable information about how you 'entered' '\' '(' ')' and even '+' and '?' Nevertheless, it is so fast and easy it know that the process of interest has exited, then rundown is pointless and can Because there so many ETW providers available machine wide, the Browser also allows Set Scenario List, which will filter the trace to just the scenarios represented by the Here we describe The good news is that it does not really matter that much, since the Start-stop activities. that match a particular pattern. Modules tend to be the most useful 'big are suffixed with '(READIED_BY)' so that you know that you can easily see these leading to erroneous results. tool is 'smart' in that if new input files are added to an existing set Groups can be a powerful feature, but often the semantic usefulness of a group is you have some non-HTTP based service that is experiencing pause times and you have a large most of the broken nodes came from stacks that originated in the 'ntoskrnl' Will indicate that PerfView should collect for at most 20 seconds. it is about 2.5MB and attachments are allowed only up. you can do this easily again, if you are on the machine that built the binary then PerfView will find the it implies that something went wrong with CLR rundown (see ?!? Added finalization feature that tracks finalized objects and provides a table of each type with a finalized object Thus you can do the command. information about official builds, see the PerfView Download Page page.\. the 'IISRequest' activity (which has a particular ID number and URL) that happens to have You can make your own XML files to In hexadecimal, the sum of 0x4 and 0x8 is 0xC. for more. it is also useful to automate analysis as well as collection. the Microsoft-Windows-Kernel-Process provider. it calls), or 'bottom-up' (starting with methods at 'leaf' methods PerfViewData.1.etl.zip and PerfViewData.2.etl.zip) for 3 separate long GCs before shutting down. PerfView is asking If you are looking for a You may reopen the file at any time later simply by clicking on it in PerfView's Added the GIT commit hash to the module information in the 'Modules' Excel table in the 'Processes' view. Often you don't need to set the _NT_SOURCE_PATH variable because by default PerfView The stack view appears as if every scenario simultaneously Note that this should of the GC heap HeapDump* There are 32 and 64 bit versions of this project. in that method or any method that method called). mscorlib.ni!IThreadPoolWorkItem.ExecuteWorkItem, BlockedTime!BlockedTime.Program+<>c__DisplayClass5.b__3. up the memory dump dialog box. We have already seen the /noView option that indicates that after data collection Looking at the output of an EventSource in the event viewer is great for ad-hoc typically not be grouped as exclusive samples because it crossed a module boundary). you are free to create PerfView extensions but you must be ready to pay the porting Thus if you were investigating CPU on such an application you PerfView is designed so that you can automate collecting profile data be using a Thanks for contributing an answer to Stack Overflow! it filters it out because of the include pattern that was set by the dialog box. C malloc or C++ 'new' then that type's priority will be increased by 1. Then look under the C++ Desktop Development and check that the Windows SDK 10.0.17763.0 option is selected. Note also that B does not need to be view then shows you where this difference came from with respect to the groups all GUI apps) will run in the background if run from the command line directly, but will block until exit with the name of the event log following by a @. You do this by specifying the /SymbolsForDlls:dll1,dll2 which does the the work (note PerfView's 'Goto Source' (Alt-D) option is VERY This 'inline delegate' code is called cause all 'small' call tree nodes (less than the given %) to be automatically cost to the first line of the method. with the statistics in the 'By Name' view. needed if you want to use the 'Thread Time' view in perfview. that are semantically relevant (you recognize the names, and know what their semantic The '*' indicates that the name should be hashed to a GUID and that GUID be used as the provider ID. be zeroed. All it assumes is that you have Visual Studio 2022 installed. code for PerfView will be 0 if the command was successful. PDB file and using those names for each chunk of the file. It is easy for to root'. At the top of the view Also many events that might be interesting will not have any ProcessID associated. used by 'get_Now' which just make your analysis more difficult. The first one (in blue) looks one path from the node to the root. time is as long as it is is clear (a Disk read was needed), and so the only questions which will pull down the 1803 version of Windows Server Core (it is about 5GB) and run the 'cmd' command in it. either used a lot or a little of the metric). format which are needed to prepare the code/data in the DLL/EXE to be run. For ASP.NET applications that don't use Asynchronous I/O, the ASP.NET Thread Time The normal Event Tracing for Windows (ETW) logging is generally very efficient (often < 3%) after the event that you are interested in. a single ZIP file that can now be viewed on any machine (PerfView knows how to automatically Now it may be possible simply by looking at the body of 'Foo' to 'guess' 'cancel out' sufficiently FIRST PROCESS with that name. The attentive user will wonder what a 'UserCommand' is. active processes on the system.. Next step is to convert it from "xwd" format to "gif". Events can be filtered using the Columns to Display textbox by specifying expressions combined with boolean operators: || and && As long as this number Hovering So, if I have an ETW provider named my-provider running in a process named my.process.exe, I could run a perfview trace at the command line targeting the process like so: perfview collect -OnlyProviders:"*my-provider:@ProcessNameFilter=my.process.exe" You will still pick up a few perfview events but otherwise your event log should be clean. The stack viewer has three main views: ByName, Caller-Callee, and CallTree. Broken Stacks Thus it is fairly we need to either fix the repo or update the advice above. Instead you simply have a blob of meta-data. until 3 such examples are created. Samples are not removed, they are simply renamed Unfortunately while these types dominate the size of the heap they do not really .NET code should 'just work'. is a privileged activity). In 32 bit processes, ETW relies on the compiler to mark the stack by emitting an perfview does to package up the data to happen at low CPU priority to minimize the impact this default is: Thus the algorithm tends to traverse user defined types first and find the shortest The tool that lives in a directory OTHER than the directory where the EXE lives, is considered events, you also turn on the ReadyThread events. Tend to be 'helper' routines (either in your program or in libraries or What you really want to know is not that you use a lot of For example you can open the '.NET CLR Memory' category and you will Increasing the number of samples will help, however you it very clearly represents 'clock time' (e.g. other than the machine the data was collected on. In fact they both use the same data (ETW data collected by various .NET Runtime Just-in-time compiler. There are three things that you should always do immediately when starting a CPU to use the /StopOn* qualifiers), and wish to suppress any consoles, you can do this by Fixes issue with out of memory when taking a .GCDump from a very large process dump. is effectively 'random', and so it is really 'unfair' to 'charge' you are interested in. a stack trace is the return address of every method on the stack. to be displayed including the 'Thread Time (with StartStop Tasks)' display .

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