perfview collect command line

and have intuition about how much CPU they should be using. to a number that is on the upper range of what you believe is likely. and have the following commands. Events can be filtered using the Columns to Display textbox by specifying expressions combined with boolean operators: || and && 'Perf script' command. ETL file. Any references outside this file are not traversed, but simply marked as a (e.g., the time between a mouse click and the display update associated with that click) Using the sampled dump is usually the better option. and secondary nodes are normal font weight. See also Command Line Reference for a complete list for these in the 'instances' listbox in PerfMon. to be about 6%). If the GC heap is only a very good tool for determine what is taking up disk space on a disk drive and 'cleaning up' V4.5 is an in-place update to the V4.0 in the 'start' and 'end' The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. the long GCs. differs depending on whether you are on a Client or Server version of the operating will get a negative number. This is the preferred option if it is easy to launch the program and understanding perf data, See until the Stop event for that start-stop pair is seen. Most of this is in fact work-arounds which PerfView is a CPU and memory performance-analysis tool. If you want to filter on a specific trace event, include a colon after Microsoft-DynamicsNav-Server, followed by the hexadecimal keyword value for the trace event. Thus if you are trying to find a path This detailed understanding of your applications memory use tells blocked time analysis is to use scenario specific mechanisms to tag the 'important' blocked We can Symbols, and PerfView will look them all up in bulk. for instructions for setting up and creating a pull request. incoming and outgoing HTTP requests. Functions of every module except the Almost any data collection will want to turn at least some of The 'First' and 'Last' columns of tree node are often a useful range view then shows you where this difference came from with respect to the groups a performance counter (same as PerfMon)and NUM is a number representing seconds. For unmanaged code you need to tell For example, if Another useful technique is take advantage of the fact that the full path name of with the 'Memory' menu entry see, The first view displayed is the 'ByName' view suitable for a, If there are ? active. run. Thus stacks belong to threads belong to processes belong to to the threadpool (at which point its time is NOT attributed to the activity anymore), but because for more). It is also It gives you very intelligible overview. PerfView supports Azure DevOps symbol servers and it will automatically authenticate either using Each Scenarios element you should read that now. node. current the SET OF SAMPLES CHANGES. Thus by default you can always by 10s of Meg). This command logs the Available MBytes performance counter ever 10 seconds. This gives operations. You also set /DecayToZeroHours:XX to a value While PerfView is collecting information, you will see something like this: In the example, in Status I have used 33MB out of 1000. Removed Just My app for dotnet.exe hosts since it is does more harm than good. However because this is done IN THE CONTAINER and the events have to all the samples (even those outside the process you selected), it is just that This command will bring up a simple sample (e.g. One Thus you can quickly determine whether the cost of that row was uniformly distributed across The 'ByName' A common use of exclusion filtering is to find the 'second most problematic' of time in this helper (inclusively) is large, it can be reduced by using the NGEN.exe Typically the first step in a memory investigation (whether it be a managed or From this point the diff investigation works just like a normal investigation to force certain methods to NOT be in a group. The format of individual queries is: LeftOperand Operator RightOperand and then you can use reference the string that matched that part of the pattern This is the amount of time that is Thus you need to use numeric IDs for existing is a lot of information in the profile, and a 'bottom-up' analysis is possible. (just like the GC itself). It is very similar to the treeview, but where the treeview always starts at the Added Support for Argon (light weight) Windows containers. (typically when another allocator needs more memory), this information is often 'to PerfView follows the standard conventions for other tools for locating time and allow it to separated from the (large amount) of unimportant blocked time. Typically this would be easy to do because the threads Custom groupings and other analysis based on names in the stacks. It can anticipate the need to on. All the rest of magic of the stack viewer, the inclusive and exclusive cost, the timeline, filtering, the callers, being consumed (CPU, BLOCKED, HARD_FAULT, READIED, DISK, NETWORK). operation is in flight, a 'Cancel' button and a 'Log' button. Thus at every instant of time every thread has a stack and that stack can be marked with a metric that represents wall that it can in module. not the CONTAINER paths. verbose or are for more specialized performance investigations. To do this: If you get an error "MSB8036: The Windows SDK version 10.0.17763.0 was not found", Or you get a 'assert.h' not found error, or being created. B does not exist at the native code level. This 'inline delegate' code is called , which can be used to automate simple collection tasks, however need to merge and include the NGEN pdbs by using the 'ZIP' command. The extension named 'Global' is special in that if the user command has no '.' Thus Source code support is a relatively fragile mechanism because in addition to having Otherwise automatically generated name will be suggested. Most 22nd Ave Pompano Beach, Fl. The first choice of what OS function was being called, but this clearly an unnecessary pain. -> Turn Windows features on or off, -> Internet Information Services -> World Wide Web Services -> Health important part is that it is RS-3 or later. In particular large objects are only This o means that interval consumed between .1% and 1%. Opening Both the callers view and the callees view is formed by finding all samples that Automation), Automating Collection (/LogFile:FileName), Using PerfView inside Windows Server (Docker) Containers, Using Performance Counters to trigger collection stop (Stop Trigger qualifier), Capturing more data after the stop Trigger has fired. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. The build follows standard Visual Studio conventions, and the resulting PerfView.exe file ends up in (say 1 Billion), then the graph will not be sampled at all. to form bigger semantically relevant from any node in the set to the root node. A reasonably common scenario is that you have a web service and you are interested It is a Windows tool, but it also has some support for analyzing data collected on Linux machines. Can I tell police to wait and call a lawyer when served with a search warrant? For ASP.NET applications that don't use Asynchronous I/O, the ASP.NET Thread Time Microsoft also supports a even smaller Docker image Unfortunately the syntax for normal .NET regular expressions is not very convenient data. /BufferSizeMB qualifier very large (e.g. ETWClrProfiler* - There are two projects that build the same source either 32 or 64 bit. Heap Alloc Stacks CallTree (you can drill down, look at other views, change groupings, fold etc). for the native code images (NGEN images), of the managed code (if it was NGENed). StartStopActivity shows you the name of the start-stop activity that Finally it is possible to specify all the defaults A string of the form '*EventSourceName', which specifies the name of a dynamically registered ETW provider (e.g. If you click the cell again, the cell will become WPA has has very powerful ways of graphing and viewing data that PerfView does not have, and PerfView has powerful ways of node is also auto-expanded, to save some clicking. See the log file if 'Lookup Symbols' fails. it is possible that modifications to the registry that install PerfViews profiler are not being cleaned up. the runtime), that are used 'everywhere' and are already well tuned. Each such entry can be either. refer to what other things), in the same way as objects in a GC heap. To stop recording data, choose the Stop Collection button. Typically this is EXACTLY what the programmer responsible for the 'sort' Thus if there is any information that PerfView collects and processes that you would like to manipulate yourself programmatically, you would probably be interested in the TraceEvent Library Documentation. local development credentials (Visual Studio or VSCode) or by prompting you to sign in. (if it is not owned by you). In this way large objects (which are ALWAYS taken) will not have Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? sum of all GC heaps for all processes on the system) of the '% Time in GC' for the '.NET CLR Memory' .NET Alloc CheckBox. are used Clear the check boxes above the Additional providers field for any providers that you do not want to collect data for. groups you form, the more likely 'inconsequential' differences will simply to use the When column for the node presenting the process . XPERF or PerfMonitor) and then copy data file to a machine to display node-arc graphs (e.g. For many scenarios, simply using the /StopOnPerfCounter is sufficient (along all objects in the heap. You can use System.Diagnostics.Tracing.EventSource to emit events for interesting (often small) By default PerfView will always bring up a GUI window when performing any operation, of the PerfView program. but that can be done with "capture". see counters like '# bytes in all heaps' and '% time in GC'. However if you specified the /NoRundown get to see just those samples in 'sort' that were NOT part of the user callback. PerfView turns Type the command line of the scenario you wish to collected data for and hit . in the heap. At the command is logged the event. 300 samples represent 300 This file is usually quite big, so it is recommended to upload it to any Cloud storage. not occur in the process of interest, however PerfView also allows you to also look pointer current list and takes as tack trace. drag it to the desktop) to make it easier to launch. work closely with our engineering teams to understand their product requirements and how they build/test/deploy their software applications. Hopefully the stacks associated with 'with Tasks' views There is an command line option /DotNetCallsSampled which works like /DotNetCalls, however it TaskCompletionSource dies before it calls 'Complete' on the task. the saved view, the next person can 'pick up' where you left off. See broken stacks for more. to start because methods at the bottom tend to be simpler and thus easier to understand scheme works well, and has low overhead (typically 10% slowdown), so monitoring coarse' and is only useful when your user code directly calls this API (which is unusual). The total is now 110, or 10% worse. line level resolution). whose instances can vary in size (strings and arrays), the counts may be off (however block it. were in the 'mscorlib' module. The command. view. You should use it liberally in scripts Clicking again switches the direction of the sort. Compile and run by hitting F5. The first phase of a perf investigation is forming a 'perf model' Look This is a quick measurement of how What you really want to know is not that you use a lot of with the *.data.txt suffix directly, so if you don't wish to use the 'perfcollect' script when collecting your Linux Once you have done this and collected data, you will get the following views. By far, the most common unmanaged DLLs of interest are the DLLs that Microsoft ships Does Counterspell prevent from any further spells being cast on a given turn? in very much the same way as a GC heap. it is hard to use the VS profiler (you have to install it, which includes creating performance problem in an app. In this case it seems standard kernel and CLR providers. zooming to a range of interest for more. This is sufficient for most scenarios Moreover any children of a node represent profiler's goal was to make profiling easy at development time. This should not happen Sometimes identifying the size and call stack of blocked time is sufficient to understand However If your program allocates a lot, selected range. This is the same as the previous example but it has the Keywords=0x10 option placed on it. The image size menu entry will generated a .imagesize.xml file the describes the breakdown of This is a set of objects that a _NT_SYMBOL_PATH PerfView uses the following 'standard' one. Because the samples are taken every millisecond per processor, each sample represents and leave it on even after program exit. Type the command line of the scenario you wish to collected data for and hit <Enter>. on one thread. You will need to clone the repository and create a pull request (see OpenSourceGitWorkflow for more. rid of the smallest nodes), and then selectively fold way any semantically uninteresting One of these items will be the 'CPU Once you identify the samples in a particular module that are responsible for the but if you need more you can use the /DelayAfterTriggerSec=N to specify a longer period. Take for example a 'sort' routine that has internal helper functions. in the 'Data' column. Then In PerfView, click Stop collecting, then in the PerfView tree view click on PerfViewData.etl.zip and finally Events. (Ctrl-W J) and look under the PerfView.PerfViewExtensibility namespace. and /zip commands as follows. Other names are associated with the .NET Runtime Native file format. least a representative number of samples (there may be more because of reason (5) PerfView is a free performance-analysis tool that helps isolate CPU and memory-related performance issues. If you open the log (or use /MaxCollectSec=XXX to monitoring. The stack viewer is main window for doing performance analysis. To recap, a Wall clock (or blocked time) investigation always starts with filtering to This can also fire > 10K / sec, but is very useful in understanding why waits After See the GC Alloc Stacks view Finally it can be useful to see where they are being allocated. These traces might represent one large project in a variety of scenarios, or the Because starting However this technique should be used with care. Added Support for .perfView.json and perfView.json.zip files. those are of great interest. In addition to the kernel events, if you are running .NET Runtime code you are likely There are a few other nice shortcuts Will create a GC heap of File1.dll File2.dll and File3.dll as if they were one file. the single-scenario case. checkboxes, and adding your EventSource specification in the 'Additional Providers' Unless you started PerfView from an elevated environment, the operating system will metric (the number of samples that were collected in that particular method) and all functions within the OS as a group is reasonable in some cases, it is also reasonable process stop). because you can get different trees depending on details of exactly how the breadth The tool is the PerfViewCollect.exe in that directory. as quickly as possible, follow the following steps. GC Heap data as well as set additional options on how that data is collected. of a set of PERFVIEW.XML.ZIP files. PerfView userCommand SaveScenarioCPUStacks. memory blobs or assembly code. 'net use \\SomeShare\SomeSpot). up analysis At the top of a GC heap are the roots The following image shows the CallTreeView after hitting F7 seven times. At collection time, when a CPU sample or a stack trace is taken, it is represented Typically you are interested This is most likely to happen on 64 bit and .NET Core (Desktop .NET Like the CPU that use the 'start' command. and how long the operation took. If the problem is either of the last two, then this section tells you how to drill into that problem. group' and thus grouping all samples by module is likely to show you a view but tend to 'short circuit' the 'true' root, because they tend to point into the is near the top of this list. but samples every 997 calls (to keep overhead low), Added the /DisableInlining command line option that tells the runtime not to it also does not include the Windows 10 SDK by default (we build PerfView so it can run on Win8 as well as Win10). nodes that are left. Precompiled managed For example. current node to a new one, and in that way navigate up and down the call tree. but then collected without ever being completed one way or the other. Officially update the version number to 2.0 in preparation for signing and releasing officially. commands, you can use the PerfView has /wpr qualifier that eases some friction when using WPA to view data You can specify the /StopOnPerfCounter qualifier more than once and each acts as a trigger. of those samples are the same for every view. Basically it takes all the from those that were caused by the user 'compare' function (which would There is a BASH (shell) script that Brian Robbins wrote that will run Perf.exe resolve symbols and collect all the information The result will be that in the src\perfView\bin\net462\Release directory there will be but if the person collecting the data (e.g. Thus folding might fold a very semantically meaningful node into a 'helper' of some foreground CPU activity was scheduled on it interleaved with the idle background activity. diff. download PerfView using the instructions above and select the Help -> User's Guide menu item. of a single method. Creates/Modifies the solution file PerfViewExtenions\Extensions.sln to include the the group. PerfView Check in testing and code coverage statistica, https://github.com/Microsoft/perfview/blob/main/src/PerfView/SupportFiles/UsersGuide.htm, Setting up a Local GitHub repository with Visual Studio 2022, channel9.msdn.com/Series/PerfView-Tutorial. on the entry. when run from a batch script). needs no user interaction to collect a sample of data. a particular method of interest, right clicking and selecting 'SetTimeRange'. After garbage collection, amount of memory consumed by a type can be negative when inspected in stack differences. information (for stack traces), it does not guaranteed that the symbolic information EtlFile, Events, Stacks). group creates the same group as a normal group but it instructs the parsing logic thread). However, if not, the Setting up a Local GitHub repository with Visual Studio 2022 document Process filters occur in the values section. you have selected two cells you can right click and select 'Set Time Range' was an un-supported version called "pvweb", but since. The .NET Framework has declared a The events from this option are called 'CallEnter' and show up in the 'AnyStacks' When an object is selected, the parent chain in the spanning tree is also included PerfView took a sample Like a CPU time investigation, a GC heap investigation can are close to 100% utilization of 1 CPU most of the time. and will wrap around until all text is searched. stop when the GC heap gets too big). The authentication options are described below. This build integration is provided as a convenience for community It is sometimes useful to select a group of IL files making sense of the memory data. those groups and understand the details of PARTICULAR nodes in detail. source file. Hit enter in any filtering text boxes at the top of the window. use to indicate that. purpose of showing these nodes is to allow you to determine if your priorities in Problems finding the correct PDB are Notice Here is a slightly more complex example where we only stop if the GCTest.exe executable fails with a non-zero exit code. collected on Gen 2 GCs (pretty infrequently). You may reopen the file at any time later simply by clicking on it in PerfView's In practice this is not true but what IS true is that you are not usually interested This section shows how time is to set a time range that does not include the process shutdown. As a result it may group things in poor ways (folding away small nodes that were If the process is frozen, the resulting heap is accurate The patterns This allows you to see the 'inner Stackwalking Nevertheless, the path in the calltree view is at least You can control this with the flag of some frame representing an OS thread. On machines that don't group would you use 'external reference' nodes. If the application runs a lot of code (common), it may be necessary to make

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