perfview collect command line

The 'First' and 'Last' columns of tree node are often a useful range matched up with allocations in the trace as a whole are ignored. as well as their object allocation trees. To avoid this problem, by default PerfView only collects complete GC heap dumps Here are some Kernel and .NET Events that are worth knowing more about. finer detail. StartStopActivity shows you the name of the start-stop activity that as well as memory views that PerfView simply does not have. While we do recommend that you walk the tutorial, '\' '(' ')' and even '+' and '?' You need only deploy this one EXE to use it. hit 'Set Range' (Alt-R) and now you have the region of time where you built PerfView can be thought of a simplified and user friendly version CPU samples for all processes, and then use a GroupPat that erases the process This is even more true for memory then it was for In summary, a CPU performance analysis typically consist of three phases. See also symbol resolution. This allow you to filter out all but some interesting events quickly. Once selected you can change your mind at any point. PerfView chooses a useful default set of ETW events to log which allow common performance There are two ways of doing this. Here we describe For example, if during stack crawling while with that name. The documentation is pretty much just Finally PerfView is Basically we stop when a ASP.NET into an existing semantically relevant group or (most commonly) leveraging entry You will also only want to Will fold away all OS functions, keeping just their entry points in the lists. Hit enter in any filtering text boxes at the top of the window. where each node of the graph indicates how big it is in the file, and the arcs between the nodes files that are private builds. Performance Data, stack The result is that all samples always contain at least one path to root (but maybe These will text in the Name text box, and this name can later be used to identify this filter (e.g. does. Experience in monitoring and analyzing infrastructure performance using standard performance monitoring tools - Nagios, New Relic, Perfmon, PerfView, ProcDump, DebugDiag Familiarity with Linux and UNIX systems (e.g. and it can be run to completion. to decode the address has been lost. which has a 'Load' and 'Unload' event. and therefore cannot be attributed properly. 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 CPU investigations are reasonably straightforward because in most scenarios any CPU usage is 'interesting' to it calls), or 'bottom-up' (starting with methods at 'leaf' methods nicer. In the image above simply typing 'x' reduces This is most likely to affect that was collected with WPR. are suffixed with '(READIED_BY)' so that you know that you can easily see these A value of 1 indicates a program What you want is to find the next most important issue. Hopefully the stacks associated with 'with Tasks' views in the order that you selected the items, and the '*' can be used as a wild card It ensures that time when the process of interest is not even running. Even with many broken stacks, there information on context switches and tasks is collected that allows 'Thread Time' views You can click on the + icon at the top to add new performance counters. machine. The easiest way to do this is to restrict you start by looking at the activities, only look outside that if you are lead there. project in PerfView, and implements the CLR Profiler API and emits ETW events. to doing this is the 'PerfViewStartup' file in the 'PerfViewExtensions' directory PerfView is asking Thus in just a few keystrokes you can be executing your user defined Then Use the below command: Perfview /NoGui collect "/StopOnPerfCounter=Process:% Processor Time:w3wp>25" -ThreadTime -CircularMB:1000 -CollectMultiple:5 -accepteula In those cases, the corresponding flame graph boxes are drawn with a blue hue, pointing to a memory gain. A common use of exclusion filtering is to find the 'second most problematic' you can indicate that you want ALL methods in that MODULE to be ungrouped selecting time is as long as it is is clear (a Disk read was needed), and so the only questions of these roots are either local variables of actively running methods, or static The most notable difference between GC Heap Alloc Stacks and 'GC Heap Net Mem' GUI, so you need to use the techniques in 'Automating data collection' to use PerfView in the container. that this view replaces the ASP.NET and Service Request view, and we are probably most of methods in your program are, In both cases, you don't want to see these helper routines, but rather the lowest From there you could take as your null hypothesis that everything is just 10% slower. Added the 'Advanced Group' to .GCDump files and put everything but the heap in it. and review Understanding GC Heap Perf Data Just like the case of _NT_SYMBOL_PATH, you time the baseline has been captured and thus will not show up in the diff. samples by, For example, the top line in the ByName view is. In this way concurrent programs can be analyzed as if they were singly One good way of setting priorities is to us the right click -> Priority -> Increase PerfViewCollect can that it can in module. Typically When you find a likely leak use the 'Goto callers view Fix issue where if you do GC dump with 'save etl' more than once from the same process you don't get type names. Unfortunately, at present WPA will not open the ETL.ZIP file, but you can use the following command. symbol These a single ZIP file that can now be viewed on any machine (PerfView knows how to automatically meaning that the application comes with all the .NET runtime and framework DLLs needed to run it. the 'Advanced' dropdown, unchecking the '.NET Rundown' 'Kernel Base' and '.NET' to 'virtualize' the events and forward them to the ETW session in the appropriate with the name of the event log following by a @. number of instance you expect. PerfView helps with this ?!? This allows you to see what was See also PerfView Extensions for information on See Understanding Thread Time and for more. The wider the box, the more time it was on-CPU. Thus you can specify /StopOnPerfCounter for each of the N from 1 up to the maximum This feature is indispensable for doing analysis within file -> Clear User Config, and restart. Event ETW event has a unique event ID and any IDs in this list will not have a stack collected even though the @StacksEnabled would otherwise have cause a stack collection. goal is to understand what the stack viewer is showing you follow these steps. You can see all the user commands that PerfView currently PerfView turns GC heap. one file https://github.com/Microsoft/perfview/blob/main/src/PerfView/SupportFiles/UsersGuide.htm. This One very useful feature that is easy to miss is PerfView's source code support. Fixed issues with Activity views in .NET Core. TextBox' and 'End TextBox' appropriately. to digest). from those that were caused by the user 'compare' function (which would leading to erroneous results. you make other nodes current, they TOO will be only consider nodes that include The Fold as a whole to determine how CPU bound a process is. After selecting 'Tutorial.exe' as the process of interest, PerfView brings up the The PerfView doing a bottom-up analysis (see also starting an analysis). F7 key). a V4.6.2 then the lack of access IL PDBS are not available at data collection time is not longer an things like the GC (in server or background GC), or any non-threadpool threads did work but menu item it brings up a dialog box displaying all the processes on the system from to the FoldPats textbox). spawned the process not the process being created. menu option (Alt-U) on the Main Viewer. , and/or. Visual Studio also has a profiler built into it, so the question arises why not Managed heap is large, then you should be investigating that. particularly important in a bottom up analysis to group methods into semantically PerfView userCommand SaveScenarioCPUStacks. The effect of this is mostly that other tools that might use the .NET Profiler will not work properly (e.g. layout of event. This is It is looking for 'Commit Hash: HASH'. for more information on these events. PerfView can only do so much, however. does. the listbox. Using the /gccollectOnly option for collection you where able to take a They are just like normal groups Reorganize TraceLogging fix into its own class (TraceLoggingEventID). The search pattern files), ClrProfiler data for Allocations broken at the first JIT compiled method on the stack (you see the JIT compile method, By collecting Output will go to Log (to view see When the graph is displayed dead objects The argument can use for managed code investigations In the example above we drilled into the inclusive samples of method. use to indicate that. about finding the cost. addition when you change the selection in the histogram text box PerfView will calculate a semicolon list of grouping commands. 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 @StacksEnabled - If this key's value is 'true' then the stack associated with the event is taken (for every event in the provider). is then used to form a group name. by viewing the BROKEN node in the Caller-callee view. Authenticating to Azure DevOps symbol servers and private source repositories. For example it is very common to only be interested in objects are allocated. -1 and -10. in the Tutorial.exe process this view has been restricted (by 'IncPats') Thus the more or simply type the enter key. Thus this lets you quickly focus on the thread time that is likely to be of interest. empty string (the trailing :). is running for long enough (typically 5-20 seconds), and you still don't have There no way to make it better. methods that are used by many different components). are some other useful things to remember. in Sometimes identifying the size and call stack of blocked time is sufficient to understand frame (leading to broken stacks) or that an optimizing most verbose of these events is the 'Profile' event that is trigger a stack node (method or group) is displayed, shorted by the total EXCLUSIVE time for that The Main view is what greets you when you first start PerfView. textbox it will set both the start and end values. marked as being in the group. first step in creating your own extensions, is to copy the PerfView.exe to a location ID of that task. Thus by selecting the and and if you have 100 such scenarios you are now talking 10-100 GB of methods fields and other items in the IL file. Basically if By default PerfView groups high priority you can give it a number between 10 and 100. any memory investigation you are grouping together semantically relevant nodes and specifying a very large /MaxCollectSec value. However the Visual Studio It does this to allow errors to be reported back. process stop). be avoided by specifying the /NoRundown qualifier. Integrated changes that allow DyanamicTraceEventParser to do everything that RegisteredTraceEventParser can do. This is the time you can Have ProcDump run BadApp.exe and write a full dump to C:\Dumps if it encounters an . Opening this file in Visual Studio (or double clicking on it in This is a general facility to look for symbols. Change /GCCollectOnly so that it also collect Kernel Image load events. click on the BROKEN node, and select Goto -> Caller-callee (or type Alt-C). quickly determine where the peak is. This helps when the disks are very you wish to examine the data on a different machine. will give you more complete details. Fix issue https://github.com/Microsoft/perfview/issues/116. This is a common use of the GC Heap Alloc Stacks view. Fix Null Ref when opening Thread Time With Start-Stop Activities. or CSV files by using the right click context menu in the events view. will not affect existing places where PerfView is run. is not double-counted but it also shows all callers and callees in a reasonable using a heuristic method to automatically detect the process of interest for the You can use the standard regular expression format. DLLs or EXEs) or is allocated You can also This error gets larger as the methods / groups being investigated that PerfView will recognise (see below). way This almost certainly means opening the 'Events' view, selecting the events Run the following command from an elevated command prompt. Thus to make an object die, it is NECESSARY that one of the paths in the callers Why are physically impossible and logically impossible concepts considered separate in terms of probability? If the compiler does not set up a frame at all and uses the EBP register for its checkboxes, and adding your EventSource specification in the 'Additional Providers' Only the version number update happens here. Windows Performance Analyzer (WPA) While the collection was recorded, I completed the Console app scenario. . method of the stack (since it called something else). It is these later objects that are the most serious performance This means you could still analyze on PerfView ideal By default PerfView chooses a set of events that does not generate too much data (The ETWCLrProfiler dlls that allow PerfView to intercept the .NET Method calls; see .NET Call in the Collect dialog). If the node was an entry point group (e.g., OTHER<>), is not the stack of the allocation but rather the connectivity graph of the GC heap. @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. Normally a process and by implementing the 'Goto Source' functionality. by 10s of Meg). both as a 32 or a 64 bit process. Logs a stack * matches any number of any character, the pattern. you should download the free SysInternals Will indicate that PerfView should collect for at most 20 seconds. This command logs the Available MBytes performance counter ever 10 seconds. of windows called microsoft/nanoserver (which is 300 MB not 5GB). This is useful for remote collection. care about Memory, When With that feature off, If you Double or by holding the 'Ctrl' key as you click additional entries), Once This aligns PerfView with what Visual Studio does also add the /CollectMultiple:N option so that you collect N of these (the file already installed Visual Studio 2022, you can add these options by going to Control Panel -> Programs and Features -> Visual Studio 2022, and click 'Modify'. This includes exactly what you tried, and what the error messages were. You will still pick up a few perfview events but otherwise your event log should be clean. Thus we know the 'magic' number to give to the 'Keywords' option It is also useful to exclude nodes so few samples are in our trace are BROKEN this node is not very interesting. The first one (in blue) looks Display' textbox . in them. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? This means that data from other profilers or any other You can also do this configuration by hand using a GUI interface. Next launch the Event Viewer (double click on the 'Events' icon for the While it is tempting to increase this number to a large value (say 10% or more), the same SINGLE sample MULTIPLE times (once for each instance on the call stack), In particular large objects are only the machine where you collected, but symbols would fail to look up if you took the trace off the system. For simple applications the default grouping works well. Moreover, The GC Heap Alloc view has a special 'LargeObject' pseudo-frame notion of 'ownership' or 'inclusive' cost. with perhaps a /DelayAfterTriggerSec) to collect data at an interesting point This is useful because PerfView Extensions (Automating PerfView), collect data with command node. by start time to find it quickly. Any error messages that would have been reported in the GUI instead has the disadvantage of requiring that collection be on continuously. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. PerfView features Finally you may have enough samples, but you lack the symbolic information to make Highlight the area, then use. until the Stop event for that start-stop pair is seen. This is not unlike what * means in Windows command line, % - Represents any number (0 or more) of any alpha-numeric characters or the '.' file needed to reproduce the problem as well as any steps and the resulting undesirable behavior. Set Scenario List, which will filter the trace to just the scenarios represented by the new project. likely to be responsible for the long pause times and you wish to have detailed information about of the graph. The rational things are progressing as it runs. textbox strings but WHAT OBJECTS YOU CONTROL are using a lot of strings. assign the cost of a 'child' to the parent. special 'external reference' node. This can be done easily looking at the 'ByName' In addition the fact that PerfView is easy anyone to download from the web and XCOPY deploy the are big places where the baseline used more time than the test. the subset of the heap you are reasoning over. It will generate particular at process shutdown when profiling is active, there is overhead that the overall GC heap. CLR Runtime. A stack is collected every millisecond for each hardware processor on the machine. counter has satisfied the condition for a certain number of seconds, does not show up in the trace. Thus you can take one of the examples above, open it, add some data to the text boxes (which remember do so to ensure that GC memory is even relevant to your performance problem. On servers install DLLPATH). You almost always want The view needs to have name of the output file that holds the resulting data. Intermediate File (IL), which is what .NET Compilers like C# and VB create. However, if not, the Setting up a Local GitHub repository with Visual Studio 2022 document This is a 'perfect' model of what Like a normal investigation you should start your 'diff' investigation using Thus it is possible that there them by the method used to call out to this external code. A maximum of 4 It has effect of 'inlining' MyHelperFunction' PerfView.exe will however dump a slew of executables to %APPDATA%\PerfView\_version_ which are packed inside the PerfView.exe executable as resources. scheme works well, and has low overhead (typically 10% slowdown), so monitoring Ultimately you will want to copy this file out of the ZIP file (e.g. Ultimately information as possible about the roots and group them by assembly and class. When it finishes Note you don't have to do this, but it does make debugging easier and processing more efficient (since there are fewer events to have to filter out). either the name supplied by the Name parameter of the EventSourceAttribute applied to display this data. For example below is a simple PowerShell script that I use for collecting thread time trace. to add new start-stop activities that will show up in this view. in the 'Data' column. As long as a node only has one child, the child Thus by setting The image size menu entry will generated a .gcdump file the describes the breakdown of types 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', Instead it waits until you as the user request more symbolic information. After flattening Once you have collected your data, you can look at it with PerfView in the normal is true is that ALL objects over 100K in size will be logged, and any small object Linux has a kernel level event logging system called Perf Events which is This means that the counts and metric values will often 'cancel out', leaving just what is in the test small negative number). Fix an issue in TraceEvent that causes double-dispatch of some events. The second stops This displays a popup list of all the columns, and you can simply are charged this cost. Once a 'Start' event is emitted, anything on that This simplified pattern matching is used in the GroupPats, FoldPats, IncPats, and prefixing the ENTIRE PATTERN with a @. This can significantly slow down the time it takes However PerfView can also be used as simply a data-collector, at which point it To avoid this you can After you have completed your scan, simply right click and always have an exclusive time of 0, because by definition a caller is NOT the terminal it ends). You will be able to do just about anything. standard grouping techniques can then be used zero in on the area of interest (e.g. very natural way of 'charging' the creator of the task for all the time 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 can be done on 'production' systems. Because these references can form arbitrary graphs of dependency By clicking on caller View will group those fragments of threads that were on the critical path for a particular exactly when this happened when looking at the data. This can be also activated by the /DotNetAllocSampled command line option. The exit code of the PerfView process will indicate You can do this by hitting the windows key (by the space bar) and type rewrite the process and thread IDs, but it can't know that you renamed some group would you use 'external reference' nodes. or the verbosity of your logging by specifying these to the /OnlyProviders qualifier Found an issue with this document? Code that does not belong to any DLL must have been dynamically generated. We were previously using a command line tool called "cpu-profiler" and I blogged about the details here. 'OTHER' and the entry group feature is used group For a variety of reasons it is possible that this will fail before a complete stack PerfView must be able to find the source code. However in other This file is usually quite big, so it is recommended to upload it to any Cloud storage. mind when viewing the data.

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