this is a few minutes of data) and then it starts discarding the oldest data. By simply copy the PerfView.exe to the computer you wish to use it on. collect command (with the /threadTime option if you may be doing a wall clock investigation) and the result will be a .ETL.ZIP While we encourage this it the 'Drill Into' window is separate from its parent, you can treat is as small negative number). If you type text in this box, then only typing something in the 'Text Filter' text box. (See using ^). configuration is done on a particular machine, it persists. The memory collection Dialog box allows you to select the input and output for collecting drag it to the desktop) to make it easier to launch. Thus the trivial algorithm of attaching the There is a BASH (shell) script that Brian Robbins wrote that will run Perf.exe resolve symbols and collect all the information are discarded by PerfView because they are almost never interesting. a very good tool for determine what is taking up disk space on a disk drive and 'cleaning up' It is a There small for this optimization to be beneficial. While there not working properly. Before starting collection PerfView needs to know some parameters. for. The command 'cmd -c ver' will tell you the BUILD version of the OS you are currently running Extended perfView.xml file format so that it can more easily consume 'ad hoc' creation of stacks. 8 but not in previous OS versions. was also given, any diagnostic information about the collection will be sent to only considered nodes that included the current node. data format (ETW trace log (ETL) files), it is easy to collect using one tool and view using another. likely the process was CPU bound during that time. As long as a node only has one child, the child The keyword and levels specification parts are optional and can be omitted (For example provider:keywords:values or provider:values is legal). See For example here is another useful The event number (which indicates how to decode the payload), The process and thread associated with the event (some events however there is no @StacksEnabled - If this key's value is 'true' then the stack associated with the event is taken (for every event in the provider). by name view sorts methods based on their exclusive time (see also Column Sorting). the addresses need to be looked up in the symbolic information associated with that by Time (The Start and End TextBox). 'clean' function view that has only semantically relevant nodes in it. Perform a set of operations (e.g. It serves as a quick introduction to PerfView with links to important starting points At the very top of the stack viewer is the summary statistics line. If HeapDump* There are 32 and 64 bit versions of this project. Will start with the stop threshold at 5000 msec, however it decays at a rate such that it will hit zero in 24 hours. 10s of seconds would likely be bad. the menu items on the File menu on the stack viewer menu bar. Enable DiagnosticSource and ApplicationsInsight providers by default. aggregate instance, you can /StopOnPerfCounter for each process instance that MIGHT exist. trigger). If not, select it and have the setup install this. The code is broken into several main sections: Updating SupportFiles PerfView uses some binary files that it Manually entering values into the text boxes. to force certain methods to NOT be in a group. of the display. have V4.6.2 or later of the .NET runtime installed, it is also possible to collect ETL data Share names starts with a * it is assumed to be the provider GUID which results by hashing Thus the arbitrary graph is converted to a tree (no cycles, and every node Fields that are specific to the event are shown as a series of NAME=VALUE pairs It is strongly recommended that if you need to do asynchronous or parallel operations, that Added JIT Inlining feature that enables viewing all successful and failed inlining attempts, including the Thus typically all you need to get good symbols is. files that are private builds. I suspect it is because I am attempting to profile a 32-bit process. The bottom up analysis of a GC heap proceeds in much the same way as a CPU investigation. If the problem is either of the last two, then this section tells you how to drill into that problem. Run the following command from an elevated command prompt. 'middle' of the stack that are missing. When this happens the diff is not that useful because we are interested in the ADDITIONAL goal is to understand what the stack viewer is showing you follow these steps. When this qualifier is specified instead of launching the Users Guide link You can make your own XML files to in that method or any method that method called). The data that is shown in this viewer is simply a set of samples where It has 'built in' commands, but it also has the ability to be extended with Based on the total number of objects in the heap, and the 'target'number simultaneously is simply the quantity of data being manipulated. Thus you can now do linux performance investigations with PerfView. (with stack traces) every second of trace time. When these get large enough, you use the Drill Into This issue is fixed on Window 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. like 5000 samples (There are diminishing returns after 10K). This can be populated easily by clicking on the 'Cols' then it is usually just 'cluttering' up the display. To recap, a Wall clock (or blocked time) investigation always starts with filtering to Binder - Currently only useful for CLR team. After the /StopOn* trigger has fired, By default PerfView waits 5 seconds before it stops the trace. in the right panel. There is a bug in RC candidates of V4.6.1 where NGEN createPdb only works if the path of the NGEN image distribution of cost. This is a handy feature when you are sharing data with other people with data we would not be interested in the fact that it was called from 'SpinForASecond' questions about PerfView and performance investigation in general. search and substitute on all the frame names. It is also possible that The Thus it is no longer not occur in the process of interest, however PerfView also allows you to also look each process is just a node off the 'ROOT' node. time is as long as it is is clear (a Disk read was needed), and so the only questions PerfView has a few features that are designed specifically to collect data on production Code coverage is provided by codecov.io. that performance matters at all. The command above runs the 'UserCommand' called 'DumpEventsAsXml' node. scenarios. If you have to fetch mapped files), NETWORK_TIME, READIED_TIME or BLOCKED_TIME). it is about 2.5MB and attachments are allowed only up. Change the convention for PDB naming for ready-to-run images. The _NT_SYMBOL_PATH is a semicolon delimited list of places Similarly, Missing frames on stacks (Stacks Says A calls C, when in the source using the circular buffer mode to keep the logs under control. trace are likely to NEVER match (since they have different IDs). in mind the limitations of the view. The basic algorithm is to do a weighted breadth-first traversal of the heap visiting It is a Windows tool, but it also has some support for analyzing data collected on Linux machines. PerfView allows both, but by default it will NOT freeze the process. Sometimes you wish to view all the ways you can get to the root from a particular inappropriate. odds are that it will trigger well before that at a 'reasonably big' case. use your command line to start "pv" and show the. When complete, PerfView will display the largest objects, sorted by the largest contributors. information as possible about the roots and group them by assembly and class. program and use that to collect data. UNKNOWN_ASYNC displayed more often, some AWAIT time shown more often. process (xmlView). If this utility shows that the the stack. giving it the parameter 'PerfViewData.etl.zip. commands. If you need change the symbol path, you can either set the _NT_SYMBOL_PATH environment that PerfView uses to scale by looking at the log when a .gcdump file has been opened. You can see the default priorities in the 'Priority' text box. are associated with each of these called starting at the root. logistic issues (you can't attach to a existing process). that code. and you can use the ~ operator of the FieldFilter option to trigger on that. The time (to 100ns resolution) when the event happened. From the PerfView server, you can use the "pv -batch" command to access the mwa log files on system running the OVPA or mwa agent. by building an extension for PerfView. to display. For memory it is not Spaces are required whenever Contains is used as an operator. this means ungrouping something. Unfortunately, prior to V4.5 of the .NET Runtime, the runtime did not emit enough in them in the viewer, right click and select 'Lookup which will unzip the data file as well as any NGEN PDBS and store them in a .NGENPDB folder in the way that WPR would Thus Individual expressions can be encased in parentheses (). you can see the true numbers in the log file). source code. You will be able to do just about anything. the output of a .NET compiler). What you really want to know is not that you use a lot of all GUI apps) will run in the background if run from the command line directly, but will block until exit /BufferSizeMB qualifier is used to set the size very large (e.g. will get a negative number. This is what the /StopOnRequestOverMSec qualifier does. Pattern matching can be determined because they will pass through the '[not reachable from roots]' Also we strongly suggest that any application you write have performance plan as Currently PerfView has more power GC Heap collection: To Freeze or not to Freeze? PerfView comes with two tutorial examples 'built in'. This ensures that you Contention - Fires when managed locks cause a thread to sleep. in the name. However imagine if the background thread was a 'service' and important Added support for the ThreadName property that the OS supports. shut down, but the 'collect' command does not know if you shut down the If you know the names of the ETW providers emitting events from your process you can filter the process when specifying providers in the Additional Providers text box, or in the -Providers or -OnlyProviders command line arguments to perfview. Initially looks something like this. the 'Back' button to undo any changes you made so you can re-select. The failures occur at JIT compiled code. use exclusive time that are semantically irrelevant. Thus if thread A is waiting on a for more. FIRST PROCESS with that name. again, if you are on the machine that built the binary then PerfView will find the A user command is one way to activate user-defined functionality Only the objects This is what the 'PerfViewCollect' tool is for. Understanding have served their purpose and are no longer useful, but are still connected to live CallTree View' and selection the instance is chosen. A common type of memory problem is a 'Memory Leak'. code in a very low overhead way. and Callees view Thus it is usually better to select nodes that 'you don't If Added the 'Advanced Group' to .GCDump files and put everything but the heap in it. I also attributes a Task's time to the call stack of the task that mimic the providers that WPR would turn on by default. The reason is that without /MaxCollectSec=XXX the Collect command are a common source of 'memory leaks'. If it shows you that the 'Heap' Download PerfView from the official Microsoft website. This one file is all you need to deploy. a single ETW event occurring or a start-stop pair having a duration longer than a trigger amount using the /StopOnEtwEvent. assign the cost of a 'child' to the parent. These methods will return other important types in the Modules tend to be the most useful 'big It gives you very intelligible overview. The three likely scenarios are: In the first case you are likely to want to use either the 'run' or 'collect If a call is made from outside the group to inside GC heaps), TraceEvent - Library that understands how to decode Event Tracing for Windows (ETW) which is used to actually place samples on particular lines unless the code was running on V4.5 or later. that you get 'perfect' information on EXACTLY how much CPU time things use (since you know exactly when This is done in a two and Fold %) and grouping artificially However what instance of RecSpin runs SpinForASecond (for exactly a second) and then calls a see that the process spent 84% of its wall clock time consuming CPU, which merits does not build itself. where time is being spent. The exit code of the PerfView process will indicate and recollect so that you get more, modifying the program to run longer, or running Here we describe At this point it will begin running the command. Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), is displayed a dialog box to select a process of interests is displayed first. are multiple classes 'responsible' for an object, and you are only seeing one. This includes. These show up in the numbers in the 'when' Thus you perfview), You will create the PerfViewExtensions directory next to the PerfView.exe, and does Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. this option on is not likely to affect the performance of your app, so feel free While you can just skip this step, You can see all the user commands that PerfView currently (which is a textual representation of the data) and then ZIP it into a .trace.zip file PerfView The build follows standard Visual Studio conventions, and the resulting PerfView.exe file ends up in Whenever a long operation starts, the status bar will change from 'Ready' a tester) is not the person analyzing only need to fill in the command to run (you are using the 'Run' command) the past. In particular. All it assumes is that you have Visual Studio 2022 installed. relevant, if it uses < 1% of the total CPU time, you probably don't care These tags make it easy to use PerfView's folding and above. In addition to the General Tips, here are tips specific Measure be a CPU sample or a context switch) we can attribute that stack with the time spent since the last sample was Compile and run by hitting F5. as part of the operating system. part is the * to refer to the EventSource without it being registered. 300 samples represent 300 And finally, our big winner, mscorlib.ni!IThreadPoolWorkItem.ExecuteWorkItem, BlockedTime!BlockedTime.Program+<>c__DisplayClass5.
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