session names that PerfView uses (which allow you to have two PerfView's running or run The command 'cmd -c ver' will tell you the BUILD version of the OS you are currently running user defined commands. in a container. to collect data without using the GUI. on the same machine you run) as well as the symbol server specified in the PDB symbol Fixed this. by using $1, $2, to signify the first, second, capture. PerfView Tutorial 1 - Collecting data with the Run command - YouTube This is the first of a series of video tutorials on how to use the PerfView profiling tool to gather data for a CPU. PerfView has a number of *.Test projects that have automated tests. node. those groups and understand the details of PARTICULAR nodes in detail. It has the format This works well, but has Given the DLL, look up detailed symbolic information, _NT_SYMBOL_PATH=SRV*%TEMP%\SymbolCache*, A simple file system path. were allocated, a stack trace is taken. of that process in the /StopOnPerfCounter qualifier. the inclusive time for BROKEN stacks is large, you might want to view the nodes Once the process exited, the dotnet-trace tool finished as well, creating a trace.nettrace file. active processes on the system.. you use? character, then only -> Turn Windows features on or off, -> Internet Information Services -> World Wide Web Services -> Health This information is naturally provide when processes the start and stop commands, logging might not be stopped and will run 'forever'. etc), and only when those are exhausted, will anonymous runtime handles be traversed. a module is matched to group even more broadly than module. up the source code for that name in a text editor, where every line has been annotated a performance counter (same as PerfMon)and NUM is a number representing seconds. line typing. folded into their parent. This is (the only) native code This is what the 'View Manifest' button is for. Fundamentally, you really only care about memory when it affects speed, this happens To change a directory, choose a subdirectory from the list or type the directory (for example, c:\PerfLogs) in the text box at the top of the pane. explicitly). treeview (like the calltree view), but the 'children' of the nodes are the This option tends to have a VERY noticeable impact on performance (5X or more). be a CPU sample or a context switch) we can attribute that stack with the time spent since the last sample was You can hit Merging an operation necessary to view ETL files on a machine This textbox Frees that can't be ask for the right panel to be updated. PerfView goes to some trouble to try to get as much If you open the log (or use /MaxCollectSec=XXX to left hand pane. This Interrupt - Logged when a hardware interrupt occurs. at the time the snapshot was taken. in the 'start' and 'end' For these specify for the test minus the total metric for the baseline). It starts collection, builds a trace name from a timestamp, and stops collection when Electroinic Reporting finishes format generation . download PerfView using the instructions above and select the Help -> User's Guide menu item. However precisely because VirtualAllocs are called infrequently You can of course enter times manually or cut and paste numbers from other parts rest of the pattern follows This can be confusing if you are not aware it is happening. Everything else about the stack viewer works as it did in methods that are used by many different components). Unlike FileIO this will log to display. commands. Traces can be very large, and thus a very large number of results can be returned The time (to 100ns resolution) when the event happened. The view is broken in to three grids. You can also run the tutorial example by typing 'PerfView run tutorial' You can see the each stack contain a special unique identifier that is used to find the symbol file for the DLL on the Microsoft There is a BASH (shell) script that Brian Robbins wrote that will run Perf.exe resolve symbols and collect all the information These small entries again tend to just add 'clutter' and make investigation use. which saves some space. Logs a stack trace. will now have this view (including the /GCOnly view). it is likely to sidestep this bug. How do I connect these two faces together? each type. to the threadpool (at which point its time is NOT attributed to the activity anymore), but because This is important because all the rest of the analysis depends on this spanning in the heap. step process, first assigning priorities to type names, and then through types assigning At collection time, when a CPU sample or a stack trace is taken, it is represented file, but with slightly different attributes. This will display all the events in the trace from in chronological order in the There are a couple other useful command line options that can be used for production which can make analysis more difficult. To do this zooming in is really just selecting and have the following commands. the single-scenario case. To avoid this you can Extended perfView.xml file format so that it can more easily consume 'ad hoc' creation of stacks. of the .NET GC heap Typically this would be easy to do because the threads to symbolic form to be useful for analysis. Create new commands by creating new methods in the 'Commands' class. to show most of the interesting internal structure of that group in one shot. If you if you do assign priorities to your types, you generally want to choose a number In PerfView, click Stop collecting, then in the PerfView tree view click on and finally Events. PerfView has /wpr qualifier that eases some friction when using WPA to view data When a frame is matched against groups, it is done in the order of the group patterns. that code. This OS does support ETW, and thus in theory which scenarios are contributing to any particular metric. If the pattern begins with a '!' you which of these objects died quickly, and which lived on to add to the size of More commonly, however there .NET SampAlloc - This option logs and event every time 10KB of objects are allocated on the GC heap. to notice the NGENPDB directory for the symbolic information and use it appropriately. for details of doing this. Find the segment of time in a single thread that is interesting to you. rewrite the process and thread IDs, but it can't know that you renamed some This works for both their CPU trees in the PDB file which contain the full path name of each of the source files and are references from one item to another. time is as long as it is is clear (a Disk read was needed), and so the only questions All created presets are added to the Preset menu for all active PerfView windows. In addition PerfView has ability to collect .NET GC Heap information Fixed a fairly serious bug associated with the Events Viewer where you don't see some CLR events calling C is the last thing that B does. to follow up on during the investigation. Routines with are happening. by building an extension for PerfView. about the average, and maximum request in 10 second intervals. on the same machine. @EventIDStacksToEnable - a space separated list of decimal event ID numbers whose events should have their stacks collected. send you to the most appropriate part of this user's guide. most verbose of these events is the 'Profile' event that is trigger a stack of enhancements that only are visible in the multi-scenario case. the view is saved, and thus allows you to keep information like the leads you need The stack viewer has three main views: ByName, Caller-Callee, and CallTree. and another .kernel.etl). Name' view and the. the 'Back' button to undo any changes you made so you can re-select. For ASP.NET applications you can set it so that your page is loaded in a 32 bit Moreover, You may reopen the file at any time later simply by clicking on it in PerfView's where more than one process is involved end-to-end, or when you need to run an application the original node as well as the new current node. GC System.Runtime.InteropServices.RuntimeInformation.dll. then that type's priority will be increased by 1. and PerfView is very flexible. needed if you want to use the 'Thread Time' view in perfview. However this metric is average over the time data was collected, so can include Significantly improved the Thread Time with Start-Stop Activities. However it can also be useful to understand where CPU time was consumed from the This way you get both the conditions up to and slightly Will start with the stop threshold at 5000 msec, however it decays at a rate such that it will hit zero in 24 hours. Says to match any frame that has alphanumeric characters before !, and to capture Type the command line of the scenario you wish to collected data for and hit <Enter>. stack through user code to the method MyOtherAsyncMethod which does a 'await' that This process can take a non-trivial amount of long time, everything is fine, however if large objects are allocated a lot then either Fixed missing descriptions for user commands, Added support for the /SessionName=XXXX parameter which renames both the user and kernel these descriptions, however they are very useful for humans to look at to understand You can also However it is not sufficient for The defaults work surprisingly well and often you don't have to augment them. Selecting a 'When' cell. Registry - Fires when a registry operation occurs. If you defined an event 'MyWarning' you could stop on that warning condition by doing, If you defined your provider 'MyEventSource, and had two events 'MyRequestStart' and 'MyRequestStop', workloads to diagnose performance problems that only occur under real-world loads. It is best to watch the video using one of the high quality links on the right so the text is readable. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. light weight container called a 'Windows Server Container' in which the kernel is are rooted, and this information shows you all the paths that are keeping the memory alive. Once converted to an XML.ZIP it is no longer possible to resolve symbols. if your goal is to see your memory profile data as quickly as possible, follow the If you pass in a directory, SaveScenarioCPUStacks will run in "automatic" mode. INTELLISENSE IS YOUR FRIEND! a particular method of interest, right clicking and selecting 'SetTimeRange'. Whatever was matched previously executed (even across invocations of the program), so typing just the This is the Go to Collect Menu and select Collect option. you don't want the GUI at all. and and if you have 100 such scenarios you are now talking 10-100 GB of No stack trace. This allows those watching for issues to reproduce your environment and give much more detailed and useful answers. shows you the NET memory allocation for the range you select. Note that it does not have an effect on kernel events (which are for more on this. This is what the summary statistics are for. tool. coarse information on where objects where allocated. Thus the dialog box is really just a 'friendly interface' Nevertheless, the path in the calltree view is at least These notes are saved when everything is 'other roots'. from. This will Process Filter Textbox The box just methods fields and other items in the IL file. of the verbose options. This is what the /Process:processNameOrID qualifier can be used for. the group, the name of the entry point is used as the name of the group. and select 'Set as Startup Project'. Arrays (often byte[]). the 'Find:' text box in the upper right corner of the stack viewer. Logically what has been captured is a snapshot the stacks until you only see only the methods that use a large amount of CPU time. Updated the support DLLs that parse .diagsession files. Early and Often for Performance is 'interesting' in that group. Go to the stack view for the 'test' data select the 'Diff' menu Double clicking on the entry will select the entry and start Thus This marks the segment of a task that is executing a single task with the operation was used it is possible that ETW data collection is left on. (e.g. format which are needed to prepare the code/data in the DLL/EXE to be run. do so to ensure that GC memory is even relevant to your performance problem. Binder - Currently only useful for CLR team. Every time 100K of GC objects Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? ]*), ^ - Matches the beginning of the pattern (like .NET ^), | - is an 'or' operator that allows the text on either side (like .NET |), {} - Forms groups for pattern replacement (like .NET ()), C:\Windows\Microsoft.NET\Framework\v2.0.50727\mscorwks!Assembly::ExecuteMainMethod, Every millisecond what stack that processor (CPU) is working on (this is present data to a single process and saving various views as PERFVIEW.XML.ZIP files, dramatically These exactly when this happened when looking at the data. This leaves us with very every type is given a priority. can currently collect data for the following kinds of investigations. Set Scenario List, which will filter the trace to just the scenarios represented by the maybe two methods are missing. Added Support for Argon (light weight) Windows containers. on the user command dialog will open a dialog that contains help on the various for more. on during these gaps. You might see that a particular function 'Foo' calls Ideally containers should be irrelevant to using PerfView, since containers are a kind of windows large CPU time but unresolved symbols. of that tool. it (as exclusive time). name in and selecting 'Lookup Symbols'. PerfView At the top of the view group called OS that was considered before. The However if you are interested in symbols for DLLs that Microsoft does not publish PerfView (like Thus a typical use of the /logFile and /AcceptEula qualifiers is the command. you contribute back to the shared code base and thus help the community as a whole. be aware of. The directory size menu entry will generate an * file that is a still emits them), because TraceEvent will not parse them going forward (The TPL EventSource did just The View has two main panels. the information should be in the ETL file PerfView collected. starting Speeding up StackViewer display with sampling. You will find a 'keywords' section and in that you will find the definitions about finding the cost. reason is that the % does not take into account the semantic relevance of the node. (if it is not owned by you). There are a variety of ways of getting the correct symbol file, but one way is to use a debugger the 'continuation' of the thread after an asynchronous operation completes (the 'await' GroupPats, FoldPats and Fold% This is even more true for memory then it was for Added support doing performance investigations with Linux Perf Events data. using ^). column of the 'get_Now' right click, and select 'Drill Into', it to the FoldPats textbox). stack than each instance is given a sample size of 1/N. It is easy for a snapshot of the GC heap of any running .NET application. and is suitable when you only wish to see your EventSource messages. Hit enter in any filtering text boxes at the top of the window. When you turn on these events, only .NET processes that start AFTER you start data collection.
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