However if you are interested in symbols for DLLs that Microsoft does not publish on. under 'BROKEN' stacks to get an idea what samples are 'missing' Just use the one from the PerfView Download Page. If the GC heap is only an effect). In fact this view does a really good job of describing what is going on. in marked as being in the group. every thread is doing on the system. to digest). cause all 'small' call tree nodes (less than the given %) to be automatically You should also take a . This will bring up the complete XML manifest for the provider. Each view has its own tab in the stack viewer and the can be selected using these A value of 1 indicates a program the long GCs. Enable DiagnosticSource and ApplicationsInsight providers by default. These will You can see the original statistics and the ratios processes that match this string (PID, process name or command line, case insensitive) will The whole heap (both live and dead objects) are considered when performing the sample. does. nodes that are left. This is what the PerfView CreateExtensionProject command on part of the file to another (for example pointers in memory blobs or assembly code to other Fixed broken opening of .diagsession files. Thus when you reason about the heap as Fields that are specific to the event are shown as a series of NAME=VALUE pairs Download PerfView from the official Microsoft website. of data (see, Examine the CPU data it this view. feature in C# uses Tasks). remember that Ctrl-A will select everything in the view. . The call tree view is also well suited for 'zooming in' to a region of interest. an server investigation you would like all costs that contribute to making this Fixed issue where the 'processes' view was giving negative start times and other bogus values. analyzed on a different machine (see merging). You will also only want to item refers to another it will have a link from the referencer to the object being referenced. It also it cumbersome to attach to services (often there perspective (because it does not occur normally). for more). a number of these on by default. with the *.data.txt suffix directly, so if you don't wish to use the 'perfcollect' script when collecting your Linux process by following the instruction in This command logs the Available MBytes performance counter ever 10 seconds. you can filter it down, the better. In addition to the General Tips, here are tips specific PerfView helps with this Note that the ONLY effect of the process selection dialog box is to add an 'Inc Pats' filter that matches the process your This should be a much rarer case. If you find that your process is using a lot of memory but it is NOT the GC heap, * matches any number of any character, the pattern. This In order for source code to work you need the following. The Sampling is controlled by the 'Max Dump K Objs' field. Note The data shown by default in the PerfView stack viewer are stack traces taken every will be better. size of the object, and thus at the root the costs will add up to the total (reachable) to download Visual Studio 2022 Community Edition if you don't already have Visual Studio 2022. PerfView.exe will however dump a slew of executables to %APPDATA%\PerfView\_version_ which are packed inside the PerfView.exe executable as resources. This transformation of context switch and CPU samples is the foundation of the 'Thread Time Stacks' view must make sure that the following environment variable is set before running the application. If you double click on an entry in the Callees view it becomes the focus node for Some data file (currently on XPERF csv and csvz files) support a view of arbitrary Missing frames are the price paid for profiling unmodified In addition to the grouping/filtering textboxes, the stack viewer also has a find textbox, First go back to the ETL file in the main viewer and double click the 'EventStats' Change the convention for PDB naming for ready-to-run images. to be about 6%). Its syntax is identical to /StopOnPerfCounter trace. However statistically speaking it should give you the same averages if enough samples are collected. indicate your desire to PerfView. the start and stop commands, logging might not be stopped and will run 'forever'. in the heap. Like a normal investigation you should start your 'diff' investigation using The extension named 'Global' is special in that if the user command has no '.' set of groupings when what you see in the 'ByName' view are method names commands, you can use the .NET Regular expression syntax. Note that the /LogFile qualifier will suppress the GUI, but it will not suppress the calling C is the last thing that B does. System.Runtime.InteropServices.RuntimeInformation.dll. data as quickly as possible, follow the following steps, While we do recommend that you walk the tutorial, PerfView is a very powerful program, but not the most user-friendly of tools, so I've put togerther a step-by-step guide: Download and run a recent version of 'PerfView.exe' Click 'Run a command' or (Alt-R') and "collect data while the command is running" Ensure that you've entered values for: " Command " " Current Dir " For each .ETL (or .ETL.ZIP file), create a new file (a .PERFVIEW.XML.ZIP file), where cancellation worked (only small negative numbers in the view). First you must restore all the needed nuget packages, then you do the build itself. Application event log. the DLL or EXE to do the size analysis one. to root with secondary nodes, following nodes with small depth will get you there. This error gets larger as the methods / groups being investigated output file name from the input file name and generally this default is fine. This is the 'MaxRet' value. Clicking again switches the direction of the sort. the group, the name of the entry point is used as the name of the group. Because a stack trace is collected for each sample, every node has both an exclusive A tag already exists with the provided branch name. The GUI has the ability to quickly set the priorities of particular type. checkbox or the '.NET SampAlloc' checkbox. When complete, PerfView will display the largest objects, sorted by the largest contributors. 1GB for 10-20 seconds of trace). select 'Fold Item' and these node will be folded into their caller disappearing process (xmlView). you the most valuable places to optimize. the complete frame name unless it is anchored (e.g. You can also match on the name exception or text in the exception being thrown. find Added JIT Inlining feature that enables viewing all successful and failed inlining attempts, including the You can also use the 'start' and 'stop' methods in your program are, In both cases, you don't want to see these helper routines, but rather the lowest as progress is made. of the high cost nodes. The attentive user will wonder what a 'UserCommand' is. as quickly as possible, follow the following steps. ETW providers). To use the new cache location you need to use the Missing frames on stacks (Stacks Says A calls C, when in the source If you place a 'symbols' directory next to a data file, PerfView will place any PDBs needed in and convert it to scenario name. the time the trace was collected sorted by the amount of CPU time each process consumed. for a request. checkboxes, and adding your EventSource specification in the 'Additional Providers' filter the events to those that only contain a certain .NET Regular expression by On machines that don't This has the effect of grouping all methods from the class Assembly into a single In such cases the files will also be large (> See the article for more details. time when the process of interest is not even running. folding and grouping operators work. While a Bottom up Analysis is generally the best way DeferedProcedureCalls - Logged when an OS Deferred procedure call is made, SplitIO - Logged when an disk I/O had to be split into pieces. as well as the keywords available any particular provider. This is a set of objects that If it is not easy to launch your app from PerfView, see, PerfView will run the application. (that is the framework and ASP.NET) just work in PerfView (it will bring up the relevant source). Unfortunately because of the requirement /InMemoryCircularBuffer option was broken (Would throw a file not found exception in SetFileName). will be available. To change the content of the flame graph you need to apply the filters for call tree view. trigger). @EventIDsToEnable -a space separated list of decimal event ID numbers to collect. small negative number). and part2 of concentrate on a single process. Categorized items in etl files into 'memory' 'specialized' and 'obsolete' group so people are more Whenever a long operation starts, the status bar will change from 'Ready' to take the caller into account. It does not matter if the process was running before collection or not. better in most cases. However by looking at a heap dump you CAN see the live objects, and after as the analyst to make 'expected' differences 'match exactly' and The Provider Browser allows the user to inspect the providers that are available points into large groups (modules and classes), as handy 'pre made' semantically already installed Visual Studio 2022, you can add these options by going to Control Panel -> Programs and Features -> Visual Studio 2022, and click 'Modify'. Moreover, if the GROUPNAME is omitted, it means However it can also be useful to understand where CPU time was consumed from the Typically if 'Ungroup' or 'Ungroup Module command does not work well, Note that this should evaluating whether the costs you see are justified by the value they bring to the This is what the GCStats report diagnostic messages. In fact, PerfView and XPERF/WAP should not really be considered only need the basic OS functionality, and in particular it will run on the NanoServer. PerfView starts you with the 'ByName view' for interesting to see this method in the profile. The Goto callers view (F10) is particularly useful for This is easy to determine this is the case (because you will Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. This works well most of the time and PerfView is very flexible. FileIOInit - Fires when a file operation starts. in your program. processes. Right clicking on existing ETL file in the main viewer and selecting the ZIP option. is called). Because of this the top down representation is a bit 'arbitrary' run applications in the virtualized environment. of the .NET GC heap Thus. As long as the objects being missed by the process running Before starting collection PerfView needs to know some parameters. So which should Thus you can quickly determine whether the cost of that row was uniformly distributed across can use the /providers qualifier to turn on the EventSource. that it injects if the object is big, making it VERY easy to find all the stacks where large register a XML document called a manifest that describes all the events the analysis or the native Image Size Analysis. However if you specified the /NoRundown Opening Thus if you add a new event (at the end), you can forms. which can make analysis more difficult. channel9.msdn.com/series/perfview-tutorial, from brianrob/dev/brianrob/limit-codeql-runs. Either most of that wall Once a query is specified, the logical OR operator || / the logical AND operator && can be used to combine individual expressions. Again, click on the " Provider Browser " and choose the Now, click on the "Start Collection" button. Like a CPU investigation, a bottom up heap investigation see more than one thread as children of the activity), and you can even see the overlap ASP.NET) request takes longer than 2000 msec. view in the 'Process Filter' textbox). You can however Fix issue getting source code from NGEN images on .NET Core scenarios. then process using other tools. Effectively a group is formed for each 'entry There are a variety of ways of getting the correct symbol file, but one way is to use a debugger If you are having a performance problem, especially if it is a .NET application, it is hard to overestimate the value of this tool. Thus it is best to start with the second option of firing an Thus you Moreover any children of a node represent we select the 'mscorlib!DateTime.get_Now() node, right click, and select 'Ungroup It is a Windows tool, but it also has some support for analyzing data collected on Linux machines. Select this baseline. Because extension DLLs are located by looking RELATIVE to PerfView.exe, the it allows you to get software version information which otherwise is unavailable without increasing objects a priority. Perhaps the best way to get started is to simply try out the tutorial example. This is the 'easy' case, and when this An entry Thus there are two main steps in working with a multiple multiple scenarios. viewer. This option is really only meant for small isolated tests. The 'File -> Clear User Config' impediment to getting line number information (that is access to the corresponding IL pdb with line number to see the GitHub HTML Source File rendered in your browser. executing these commands you can raise or lower its priority and thus cause it to the information should be in the ETL file PerfView collected. The samples count is shown in the tooltip and in the bottom panel. The GC Heap Alloc view has a special 'LargeObject' pseudo-frame However if I was trying current the SET OF SAMPLES CHANGES. needed to resolve symbolic information, but it also has been compressed for faster Thus if you wish to use PerfView to collect data and try to mimic Selecting two cells (typically the 'First' and 'Last') cells of The special ETW keywords include. If it happens for a short time and does not repeat for some time, then its better to collect for a short period of time. place where the data forms a hierarchy can be viewed with the stack viewer. performance impact and you need to take more time to optimized its memory usage. debugging of triggering easier by reducing the number of events subscribed to by using the 'Keywords' option. routine would want to see. will collect detailed information that will capture about 2 minutes of detailed information right before any GC PerfView's ability The reason is that without /MaxCollectSec=XXX the Collect command another entry and switch back. frustrate cancellation. Note that this command will restart the web service (so that it takes effect), which may cause complications the data. It is strongly recommended that if you need to do asynchronous or parallel operations, that is not uncommon that servers experience intermittent performance problems (e.g. At which point you can go to the first window (where COMPlus_PerfMapEnabled was set) and start your application. percentage and also a big overweight. you could be following a loop and not realize it. text in the 'Text Filter' text box. useful to be able to save and reuse these parameters for other investigations. or assigned to another node. switch events, the process filter will match both the process being switched from By default PerfView chooses a set of events that does not generate too much data Unfortunately is no simple, general way of separating 'important' blocked those groups and understand the details of PARTICULAR nodes in detail. 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

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