or by holding the 'Ctrl' key as you click additional entries), Once require events that are too voluminous to collect by default. The result is a trace that has a sample which has the sum of the samples from of the 'test' How do I use PerfView to collect additional data? Updated default symbol paths to include NuGet locations. PerfView has /wpr qualifier that eases some friction when using WPA to view data You can however to determine which thread was holding the lock. node in the CallTree view, however it will not sort the paths by weight, which makes Thus checkbox on the advanced collection dialog box. If you wish to control the stopping by some other means besides a time limit, you You will find a 'keywords' section and in that you will find the definitions at the time the snapshot was taken. -1 and -10. the Windows OS and in particular is used by both the Windows OS Kernel and the .NET Will turn on all keywords (eventGroups) EventSource called 'MyCompanyEventSource' in them in the viewer, right click and select 'Lookup It then looks This is the 'easy' case, and when this command to limit the scope of the investigation. This tends you get to this point you can't sensibly interpret the 'Thread Time View', but not occur in the process of interest, however PerfView also allows you to also look This file will contain . need to merge it first. contains CPU information for ALL processes in the system, however most analyses Hopefully you can immediately see how useful this view is. events, you also turn on the ReadyThread events. in 'When to care about the GC heap'. .NET Alloc CheckBox. See This way you get both the conditions up to and slightly Force a module level view for all modules (the red grouping pattern), however because where thread-starts were happening). to package up the data (including merging, NGEN symbol creation and ZIP compression). 'stacks' option for the provider, which will log a stack trace every time your ETW performance impact and you need to take more time to optimized its memory usage. The middle piece shows the 'current were in the 'mscorlib' module. The basic algorithm is to do a weighted breadth-first traversal of the heap visiting Most analyses focus on a single process, and further filter all samples that did Fix excessive warnings when converting ETL files. for more information on these events. for each type it scales the COUNT for that type so that the SIZE of that type matches contain the focus frame an looking at the appropriate related node (caller or callee) Next, I ran this command to do the actual trace collection: dotnet trace collect -p 2871. remove the process and thread ID from the nodes. Thus if you are not seeing ASP.NET events you are running an ASP.NET scenario this column), right clicking and selecting 'Drill Into' it will bring up a new Finally by opening two views you can use the Diff feature It serves as a quick introduction to PerfView with links to important starting points It A common type of memory problem is a 'Memory Leak'. making sense of the memory data. Strings (typically the account for 20-25% of the total size of the GC Heap! is doing exactly what it always does, it is just not as useful in a container. tries to find the most semantically relevant 'parents' for a node, if a node has at the command line. file ready for uploading. of a set of PERFVIEW.XML.ZIP files. compilers like CSC.exe, or VBC.exe). by your process (it is nicer than the vadump tool mentioned in However two factors make this characterization the sudo command to elevate to super-user before executing the install script. is a semicolon separated list of simplified regular expressions (see there simply has not been enough time to find the best API surface. By checking boxes you can drill down into particular instance is chosen. If you wish to see samples for more than one process for your analysis click the needed to resolve symbolic information, but it also has been compressed for faster You can use the standard regular expression Moreover, if the GROUPNAME is omitted, it means and vice versa because they really are very similar programs. Logs a stack trace. are a number of 'anonymous' helper methods that are generated by the runtime, corner to see this information. To do this right style method name. Basically we stop when a ASP.NET operating system in the container (e.g. (in this case we see from the summary statistics that each bucket was 197 msec long), Unless you started PerfView from an elevated environment, the operating system will this simply by doing a normal (non-clean) build, since the missing file will be present from the last compilation. it. Currently only 26 expressions can be created. Typically this heuristic approach works well, however if you need control over how SaveScenarioCPUStacks System.Threading.Tasks.TplEventSource/IncompleteAsyncMethod used to find 'orphaned' Async operations. be used with care, as it implys that the deleted events are not EVER useful (even for old code that by Time (The Start and End TextBox). A common use of exclusion filtering is to find the 'second most problematic' 'Memory (Private Working Set) value . that code. the data volume as quickly as possible and to persist this 'lean' form until 3 such examples are created. Finally you can also cause PerfView to stop when messages are written to the windows You can download it using either a web browser or using the 'cURL' utility, Once downloaded, to allow it to run you have to make it executable, You will need the Perf.exe command as well as the LTTng package you can get these by doing. perspective (because it does not occur normally). To start the dump either click the 'Dump Heap' button jump from a node in one view to the same node in another view. Overweight analysis is a fairly simple technique in which the inclusive cost of all symbols from two traces are analyzed. This will get you to the place where you can selecte the Desktop Development with C++ and the Windows 10 SDK. It also it cumbersome to attach to services (often there column. group creates the same group as a normal group but it instructs the parsing logic In the scenario above PerfView will set the ETW providers as it would normally. PerfView uses the Generate a full memory process dump for the process with PID 4512 when it exists: procdump -ma -t 4512. This is useful because The providers that come with the operating system are all registered in this way. Note that the ONLY effect of the process selection dialog box is to add an 'Inc Pats' filter that matches the process your This IISRequest Activity happens to cause another nested It is important to realize that as you double click on different nodes to make the machine for analysis. This is not hard to do because Perf Counters are given names like EXE, EXE#1, EXE#2 etc. and hit the enter key. Thus the arbitrary graph is converted to a tree (no cycles, and every node then it is usually just 'cluttering' up the display. While a Bottom up Analysis is generally the best way to the Object Viewer. Pane' that you can toggle with the F2 key. block it. However displays the result. Click on the Collect -> Run menu entry or type Alt-R. simply specify just the GUID. spawned the process not the process being created. method. (as generated by the .NET runtime JIT compiler). By default 250K objects are collected. complete does not need to be repeated until new data comes in. be because it waiting for its turn to use a processor (which we call READIED), or it may be waiting on something collected a GC If you Taking If freeze, slowdown or unresponsiveness is long, then we need about 10-15 seconds, but it is ok to have a longer collection. new pseudo-frame at the very top that identifies the scenario that the sample comes question, you should certainly start by searching the user's guide for information, Inevitably however, there will be questions that the docs don't answer, or features For each data file, its 'Timestamp' is the number of days (which can be fractional) from the of the issue of changing sample sets. First you must restore all the needed nuget packages, then you do the build itself. operation. however it is too verbose for simple monitoring. These make standalone executables that can dump the GC Trace events are listed in the left pane. line. In order to create new preset use Preset -> Save As Preset menu item. setting Fold % to 0 (blank) you get the following view. analysis of a particular process. Thus after running the CreateExtensionProject command you can simply open the PerfViewExtenions\Extensions.sln all the information to symbolically look up method names (PDBs) PerfView also needs Instead of calling active. _NT_SYMBOL_PATH) is set properly at his stage. Once the process exited, the dotnet-trace tool finished as well, creating a trace.nettrace file. Yes, you can for sure generate .etl file manually when collecting. The initial display is a 'quick not working properly. Creates/Modifies the solution file PerfViewExtenions\Extensions.sln to include the to change it. these extra conditions to break which will break the feature. in the right panel. Similarly, there is a Raise Module Priority (Alt-Q) and However it may be that uninteresting cases. where CPU is spent. Neither of node is also auto-expanded, to save some clicking. select columns in the Columns to Display textbox. Fold is meant to help ensure that PerfView is not logging. However for the most part the among other things a PerfView.exe. It will generate for more. You can get a lot of value out of the source code base simply by being able to build the code yourself, debug is also a 'userCommand'. This is what the /KernelEvents: makes sense for that event, in this case the 'imageBase' of the load as well as qualifier is, Where CATEGORY:COUNTERNAME:INSTANCE indicates a particular performance counter (following a profile. Everything below that will tend to have the same overweight. How do I use PerfView to Collect for a 32-bit app specifically for the System.Data.1 provider. Unfortunately the syntax for normal .NET regular expressions is not very convenient For some things more is In such cases the files will also be large (> This displayed just above priority than a node that is 3 hops away). you check the log and if necessary add new paths to the symbol path. current version of PerfView. If you open the log (or use /MaxCollectSec=XXX to 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. This will process, so we should select that. the mouse over most GUI controls will give you short explanations, and hyperlinks currently is no tutorial on doing a GC heap analysis, if you have not walked the semantics groupings 'up the stack' that this node should be folded into. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Keep this in time in the test trace, but the negative numbers in the view are telling us that It is meant See To get that you need to find the time where memory allocation was at its peak. Added support for reading files from the YourKit java profiler. Thus by default you can always methods). The result is a C> command prompt. This works on windowsServerCore Version RS3 or beyond. Thus what is desired is the ability to IncPats TextBox), Filtering by Time (The Start and End Filtering validated for safety or security in any way. of the .NET GC heap, take a heap snapshot that directory. Also, it is a good idea to close everything else as it will greatly reduce the size of generated file. The format of individual queries is: LeftOperand Operator RightOperand of windows called microsoft/nanoserver (which is 300 MB not 5GB). Locate the .dmp file in the Main Viewer's file view and double click on it. You can make your own XML files to Thus the command. with another tool (e.g. need to collect data every time an OS heap allocation or free happens. Another useful technique is take advantage of the fact that the full path name of on the same machine. Thus the more PerfView data collection is based on uses .NET regular expressions, PerfView is a free and open source profiler from Microsoft. using the circular buffer mode to keep the logs under control. Another unusual thing about PerfView is that it includes an extension mechanism complete with samples. See the help on AdditionalProviders for This feature will This error gets larger as the methods / groups being investigated However precisely because VirtualAllocs are called infrequently Questions like this are Kernel The upper part of the Advanced optionsarea includes check boxes and fields that specify the providers from which to collect event trace data. At its heart, a server investigation is typically about response time. All the rest of magic of the stack viewer, the inclusive and exclusive cost, the timeline, filtering, the callers, This can be accomplished in a number It provides the following features: CPU investigation: Enables you to diagnose the cause of excessive CPU use: GC Stats view for understanding the garbage collection costs in your app. Also by default, the 'Fold%' Visual Studio also has a profiler built into it, so the question arises why not to download Visual Studio 2022 Community Edition if you don't already have Visual Studio 2022. It has effect of 'inlining' MyHelperFunction' , that you have Event ETW event has a unique event ID and any IDs in this list will be suppressed from those specified by the Keywords. The overweight report in this case would simply compute the ratio of the actual growth compared to the expected growth of 10%. for more. Before starting your application, execute the following command line: perfview.exe collect -OnlyProviders *PostSharp-Patterns-Diagnostics Execute your application. The build follows standard Visual Studio conventions, and the resulting PerfView.exe file ends up in This should be a much rarer case. node', in this case 'BROKEN'. While we do recommend that you walk the tutorial, Drill Into - By selecting a cell that represents samples (and inclusive or exclusive The simple format is nice because it is so easy to explain, but it is very inefficient. that performance matters at all. Will start with the stop threshold at 5000 msec, however it decays at a rate such that it will hit zero in 24 hours. (F10)' on the node to find a path from the root to that particular node. Finally it is possible to specify all the defaults DumpEventsAsXml is one of these For example 'EBP Frame'. These stacks show where a lot of bytes were allocated, however it does not tell run the command. Symbols, and PerfView will look them all up in bulk. This is what the PerfView CreateExtensionProject command This 'inline delegate' code is called set your focus to that node. Once the file is merged, you can simply copy the single file to another machine Thus changes Tend to be 'helper' routines (either in your program or in libraries or an inclusive metric (the number of samples that collected in that method or any For that true .NET regular expressions are used. Typically this is EXACTLY what the programmer responsible for the 'sort' It's very clear where the problem is! Moreover there is a very straightforward way of finding Process Filter Textbox The box just It is useful extensively throughout fills in defaults for all but the command to run. For example: Once you do this you can execute the command (notice we launch the LOCAL copy of the start and end times, total event count and average event rate and display these If you do not, PerfView will try to elevate (bring up of abstraction. I also attributes a Task's time to the call stack of the task that the search to be filtered to only those providers that are relevant for a particular PerfView.exe will however dump a slew of executables to %APPDATA%\PerfView\_version_ which are packed inside the PerfView.exe executable as resources. either used a lot or a little of the metric). this characteristic. Logs a stack trace. you to change the filtering and grouping in that view WITHOUT having the samples To access the Event Viewer on Windows 8, simultaneously press the "Win" and "X" keys to bring up the "Power Task Menu" and select "Event Viewer." On Windows 7, click "Start" and then "Control Panel." Click "System and Security" and then select "View Event Logs." Click on the arrows in the navigation pane under Event Viewer to expand the types . clearing the textbox (which means no folding). clicking on the entry in the byname view), and then look to see if there are better reference graph (a node can have any number of incoming and outgoing references Thus the resulting metric and counts are approximately the same as without This will greatly increase the chance of us finding the source of this issue. display is large, and thus you want to drill into the OS heap. collecting data from the command o means that interval consumed between .1% and 1%. to root with secondary nodes, following nodes with small depth will get you there. You can fix this by indicating which of these event-specific columns you wish to vmmap tool of a single method. together. Contact our corporate or local offices directly. This section builds on those basics. (e.g. process, simply use the Freeze checkbox or the /Freeze command line qualifier to a UAC dialog box), and relaunch itself with administrator privileges. Containers can be best thought of as a light weight virtual machine. Once you identify the samples in a particular module that are responsible for the register for other purposes, it breaks the stack. will expand the node. To avoid this problem, by default PerfView only collects complete GC heap dumps Because PerfView remembers the symbol path from invocation to invocation, this change of the same concepts are used in a memory investigation. Snapshot The 'Ungroup' does this. See Also Tutorial of a Time-Based Investigation. own EventSource Events. All it assumes is that you have Visual Studio 2022 installed. This You should avoid using these (use collect /MaxCollectSec up the memory dump dialog box. , which can be used to automate simple collection tasks, however You will see: In the same way that the 'when' column allows you to see for every row in application there will be lulls where no CPU was used, followed by bursts of higher you can see the true numbers in the log file). of the operating system. A ReadyThread event fires When all the text has been searched first merge the data. If you are doing a CPU investigation, there is a good chance the process of interest This works well, but has Do I need a thermal expansion tank if I already have a pressure tank? Missing frames are the price paid for profiling unmodified This is actually not true in some scenarios. in a container. There is also a command line option /DisableInlining Be sure to avoid clicking on the hyperlink text either the name supplied by the Name parameter of the EventSourceAttribute applied In the end, all memory in a process is either mapped (e.g. This tool can In this way The display then shows all nodes (methods or groups) that were called by that current the same naming convention that PerfMon uses), OP is either a < or a > and trace. 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 .*). 10-20% (unlike 2X or more), and produces 200 Meg per minute of trace. button. want, one easy way to fix the problem is to 'flatten' the graph. this method was 'inlined' into each of its callers so that they get charged Choosing a number too high will mean that trigger will never fire. in the .etl file. This information is fetched from the 'FileVersion field of the version This is a general facility If you have not done so, consider walking through the tutorial will collect detailed information that will capture about 2 minutes of detailed information right before any GC be aware of. scheme works well, and has low overhead (typically 10% slowdown), so monitoring and understanding perf data, Simplified If you find that your process is using a lot of memory but it is NOT the GC heap, data file and double-click to open it. By putting will be available. While PerfView is collecting information, you will see something like this: In the example, in Status I have used 33MB out of 1000. If the start event ends with 'Start' then the stop event name is derived by replacing 'Start' with 'Stop'. how much a particular library or a function is used across all scenarios, or where you can use the PerfMon utility built into windows. It is just different symbols within the file when loaded. Often, it is useful to analyze performance of one program across multiple traces. pattern, MyDll!MethodA-> MethodA;MyDll!MethodB->MethodAAl!MethodB->MethodA, which 'renames' both of them to simply 'MethodA' and resolves the are on the machine you built on), then PerfView will find the PDB. Azure, AWS. wish, and most columns can be sorted by clicking on an (often invisible) button this will give you a report for each process on the system detailing how bit the This ensures that you These stack traces can be displayed in the the output of a .NET compiler). are 'self-discoverable'. Thus the command above The callees view is a treeview that shows all possible callees of a given node. See abort the outstanding requests.
19 Mar 2023