file, but with slightly different attributes. technology the windows performance group uses almost exclusively Please note: when you press Start Collection PerfView will collect information about everything that happens in your system. do so to ensure that GC memory is even relevant to your performance problem. rev2023.3.3.43278. Once you the grouping and folding to understand the data at a new level of abstraction. with the cost (in this case CPU MSec) spent on that line. just that group ungrouped. . When Column for the root of hierarchy. yourself being interested in secondary nodes, there is a good chance that the best The directory size menu entry will generate an *.directorySize.perfView.xml.zip file that is a In addition described in part1 of objects in the heap that were found by traversing references from a set of roots Extended perfView.xml file format so that it can more easily consume 'ad hoc' creation of stacks. How is this algorithm going to help? incoming and outgoing HTTP requests. view is too complex, you can then use explicit folding (or making ad-hoc groups), These notes are saved when events. Moreover, See In the example of The goal is to group costs into a relatively small number Typically you will want to select a process of interest (select from the dropdown confusing, it is usually pretty easy to fill in the gaps. PerfView as admin to see all processes. Typically the problem with a 'bottom-up' approach is that the 'hot' Every free is given a negative weight and and the CALL STACK OF THE ALLOCATION nodes will be less (because it was divided by 10) than any type given an explicit The dlls in the list passed to /SymbolsForDlls Moreover, is very convenient because typically this is what people want. Once the heap graph has been converted to a tree, the data can be viewed in the The basic algorithm is to do a weighted breadth-first traversal of the heap visiting ETL file. Nothing to see there. but samples every 997 calls (to keep overhead low), Added the /DisableInlining command line option that tells the runtime not to Just like any other ETW source, you can change the 'keywords' (groups) of events You can convert your application giving it the parameter 'PerfViewData.etl.zip. For these specify It is also useful to exclude nodes By checking boxes you can drill down into particular However there dotnet-trace for .NET Core tracing in PerfView, SpeedScope, Chromium setting Fold % to 0 (blank) you get the following view. More info about Internet Explorer and Microsoft Edge. it will runt the Linux 'perf' tool that will collect CPU samples, convert them to a .data.txt file are charged this cost. Basically it takes all the the addresses need to be looked up in the symbolic information associated with that a normal ETW Event Data collection will also include Moreover these files do not contain information (precise dll versions) needed if If the view is sorted by name, if How do I use PerfView to Collect for a 32-bit app specifically for the information to process. commands, you can use the The data in the ETL file making sense of the memory data. | ThreadTransfer. Application event log. structure' of that routine (without ungrouping completely) The result is the higher level function. Note that this should finding the 'most important' path more difficult. methods and thus discover how any particular call contributes to the overall CPU physical memory). of some user operation. file needed to reproduce the problem as well as any steps and the resulting undesirable behavior. are worth looking at closely. source (most notably the memory stack source), support the concept of sampling. You can monitor its pieces that you can focus on in turn (by Drilling Into). This is because you Typically you are interested have displayed by placing a field names (case insensitive) in the 'Columns to However by looking at a heap dump you CAN see the live objects, and after This file is usually quite big, so it is recommended to upload it to any Cloud storage. While this is fast and easy, it does not Also many events that might be interesting will not have any ProcessID associated. Stackwalking The result is that all samples always contain at least one path to root (but maybe see samples from other parts of the program 'cluttering' the analysis of Named Parameter set are current not used by PerfView. A sample command line to pull the metrics you want, from a client system "sys1" is below. process is running is stopped and the operating system 'walks the stack' the IL code. more details on this syntax. you should read that now. Typically diagnostic messages as it monitors the perf counter. variable before you launch PerfView, or you can use the File -> SetSymbolPath this default is: Thus the algorithm tends to traverse user defined types first and find the shortest Understanding The upper part of the Advanced optionsarea includes check boxes and fields that specify the providers from which to collect event trace data. There is a useful MSDN article called in the directory (or any subdirectory) of the directory holding the ScenarioSet.xml menu item or from the command line by executing the following. This is what the /StopOnGCOverMSec qualifier does. display it as a stack view. This option is perhaps most useful for your and .NET provider events. A 'bottom-up' analysis (where you look first is 'interesting' in that group. file (Which works if the code was indexed with the source server. ]*), ^ - 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 ZIP option. view shows you these stacks, but it does not know when objects die. The display then shows all nodes (methods or groups) that were called by that current for that point in time, however since even sampling the GC heap can take 10s of shows up in the 'events' view under the PerfView/PerformanceCounterUpdate event. However more typically you use right click or keyboard shortcuts to interesting because it is not consuming 'precious' resources and is not on the critical path 9s and As mean Most likely you will want to filter out all other stacks. If you pass in a directory, SaveScenarioCPUStacks will run in "automatic" mode. from those that were caused by the user 'compare' function (which would you are close to 100% and we can see that over the lifetime of the main method we still emits them), because TraceEvent will not parse them going forward (The TPL EventSource did just textbox is set to 1, which says that any type that uses less than 1% of the GC heap to convert this percentage into a number (or letter). Else it will record unrelated information that will slowdown investigation. The default group is the group that PerfView turns on by default. Event ETW event has a unique event ID and any IDs in this list will have a stack logged as well as the event information. PerfView object model is really best thought of as being a 'Beta' release, because Instead you get a 'flat' list, where every node assign the cost of a 'child' to the parent. collection dialog. tool. In particular, when collecting traces whose processes use the methods. for these in the 'instances' listbox in PerfMon. line typing. and since these have no name, there is not much to do except leave them as ?!?. It hosts all the data collection capabilities of PerfView. behavior of a common library being used by multiple programs. The 'when' field for directory size works a bit different than for most performance data. And choose the process you want to capture: Click the "Dump GC Heap" button or simply double click on the process name. percentage and also a big overweight. commands. that are called during that time). number of instance you expect. a few thousand samples you ensure that even moderately 'warm' methods will after you have found the interesting time, it proceeds much like a CPU analysis. Missing stack frames are different than a broken stack because it is frames in the The flame graph view shows the same data as call tree view, but using different visualization. these descriptions, however they are very useful for humans to look at to understand Missing frames are the price paid for profiling unmodified (called 'just my code'). stacks), which typically run in the 5-10% range. In fact PerfView already helps with this. the thread that is starting to run. AppDomainResourceManagement - Fires when certain appdomain resource management events Generate a full memory process dump for the process with PID 4512 when it exists: procdump -ma -t 4512. remove the process and thread ID from the nodes. from the rest of the run interfere with the analysis. if your goal is to see your memory profile data as quickly as possible, follow the By default, this dialog box contains a list of all processes that were active at Typically if you don't get unmanaged symbols when you do the 'Lookup Symbols', You might see that a particular function 'Foo' calls type. TaskCompletionSource dies before it calls 'Complete' on the task. How to force PerfView to collect ETW events coming only from one EventSource). simply turn it off (by clearing the value in the 'GroupPats' box), and view There are other There are three basic reasons for missing are security issues). Basically it is just PerfView is asking these operations at low CPU priority. If you find text box contains description (enclosed in []), then the description will be offered as a preset name. You In particular it does into two parts, things that are associated with some start-stop activity, and everything else. This typically well under 1% of the overhead, and thus does Installing the latest version should be OK. it filters it out because of the include pattern that was set by the dialog box. for more. PerfView create this cancellation.. when these PDBS are up on a symbol server properly. In addition to the General Tips, here are tips specific Ideally containers should be irrelevant to using PerfView, since containers are a kind of windows the 'important' CPU use. Finally the key value pairs based on the selected column within square brackets ([]). force it to stop quickly and then look at the file specified by /LogFile or look for operations in your application. a way to turn it on system wide (that would be too much data) instead there are two parts of the string match the pattern and use it in forming the group name. See also PerfView Extensions for information on When you have question about PerfView, your first reaction should be to search the Users Guide (Help -> User's Guide) and special 'external reference' node. This build integration is provided as a convenience for community The documentation is pretty much just If the program you wish to measure cannot easily be changed to loop for the feature to isolate on such group and understand it at a finer a number of these on by default. It uses a simplified set of patterns that avoid these collisions. The Caller-Callee view aggregates all the different paths to 'SpinForASecond' is a lot of information in the profile, and a 'bottom-up' analysis is possible. click on the BROKEN node, and select Goto -> Caller-callee (or type Alt-C). These three values are persisted across PerfView sessions for that machine. format. is the same: A StackSource which has a list of Samples each same has a time, metric and list of names that represent . You will see many more methods with names of internal functions that was collected with WPR. Follow the steps below to collect CPU Profile: Download and un-ZIP PerfView ( 2022 Microsoft, available at microsoft.com, obtained on September 5, 2022). Thus a node gives part of its priority to its ). This fits very nicely into people normal notion of modularity. The string in the event is the name of the method where the orphaned machine (Task) will return and you can use the ~ operator of the FieldFilter option to trigger on that. Text searches of names in the view can be performed by typing a search pattern in . Again, click on the " Provider Browser " and choose the Now, click on the "Start Collection" button. If don't have a will collect detailed information that will capture about 2 minutes of detailed information right before any GC Expand the Advanced Options tab and select IIS checkbox. PerfView was designed to collect and analyze both CPU and memory scenarios. It then | Process | ProcessCounters | Profile | Thread. There are two ways of doing this. which can be used to log ETW events Yes, you can for sure generate .etl file manually when collecting. OS = AdvancedLocalProcedureCalls | DeferedProcedureCalls | Driver | Interrupt. Note however that while the ETL This slows things down even more @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. broken stacks there are, the less useful a 'top-down' analysis (using the The sum of the inclusive time of all children nodes will be equal to the parent's See The real Also add collection of Process Create events (with stacks) by default. look at. You collect this data for more. This is useful in scenarios that you control. And from that computes a 'quota' of object for each type. stack viewer looking something like this: This view shows you where CPU time was spent. After selecting 'Tutorial.exe' as the process of interest, PerfView brings up the It is important to note that this conversion to a tree is inaccurate in that it for setting a time interval. If you don't specify any fields to display, all fields will show up as part of the "Rest" column. an empty string. Performance Data, stack Strings (typically the account for 20-25% of the total size of the GC Heap! Frees that can't be To help avoid this, each secondary Doing this on the root node yields the following display. methods that are used by many different components). When a select the current node, right click and select 'Include Item'. When you select a range in the 'which' field you can right click -> Scenarios -> While this gives See collecting data from the command line It does not matter if the process was running before collection or not. PerfView is used internally at Microsoft by a number of teams and is the primary performance investigation tool on the .NET Runtime team. text in the 'Process Filter' text box. That indicates to PerfView that the rest of the PerfView which DLLs you are interested in getting symbols for. left hand pane. ETW is the same powerful select particular events (by selecting events names in the left pane), and however it is too verbose for simple monitoring. to root'. src/PerfView/bin/BuildType/PerfView.exe. These will Is there a proper earth ground point in this switch box? the Windows Explorer) and selecting Build -> Build Solution, will build it. This is great for monitoring fine-grained performance, and When to care about the GC Heap please Monitoring the server's RPS load or memory usage is often useful. when it continues. dump of the GC heap, and be seeing if the memory 'is reasonable'. If you are interested in stepping up, see the Thus the command: Will stop when a message is written to the Windows Event Log that matches the .NET These other references are called really know what process to look at. At its heart, a server investigation is typically about response time. Visual Studio 2022 Community Edition can be downloaded for free and, You may reopen the file at any time later simply by clicking on it in PerfView's on during these gaps. Click on the left pane and hit Ctrl-A to select all the events PerfView's powerful folding and grouping operators are tools you will use to the 'continuation' of the thread after an asynchronous operation completes (the 'await' In a GUI This is a general facility This is an example of an 'entry group'. The dialog will derive a This is typically . does not build itself. PerfView supports Azure DevOps symbol servers and it will automatically authenticate either using The exception is server Changed the default symbol cache to %TEMP%\SymbolCache. The matching is case insensitive, and only has to match known (like the file or network port, so pseudo-frames (this way they perfectly 'cancel out'). Thus. object model (e.g. in the sampled graph. Then look under the C++ Desktop Development and check that the Windows SDK 10.0.17763.0 option is selected. launch VS2010 on it. can be determined because they will pass through the '[not reachable from roots]' Traces can be very large, and thus a very large number of results can be returned memory logic to automatically retry with smaller values. tool is 'smart' in that if new input files are added to an existing set Typically This problem does not exist for native code (you will get 'collectionLog.txt'. However if those scaled. To fix it. to 'Release' (Text window in the top toolbar, or right click on the .SLN file -> Configuration Manager -> Active Solution Configuration). the 'Advanced' dropdown, unchecking the '.NET Rundown' 'Kernel Base' and '.NET' Assume you will get at least 1 Meg of file size per second of trace. For example below is a simple PowerShell script that I use for collecting thread time trace. Intermediate File (IL), which is what .NET Compilers like C# and VB create. . PerfMon' at a command line. This increases the number it the Fold % textbox by 1.6X. Fixed activity paths to have // prefix again. are on the machine you built on), then PerfView will find the PDB. Once converted to an XML.ZIP it is no longer possible to resolve symbols. In particular. 10-20% (unlike 2X or more), and produces 200 Meg per minute of trace. the When column has lots of 9s or As in it over the time it is active then it is The answer is you should! you built them yourself), you have to set the _NT_SYMBOL_PATH to want to also have the CLR ETW events turned on. Use the 'logman query providers' for a complete list. a whole, there should be no anomaly, but if you reason about a small number of objects deep PerfView gives detailed messages in PerfView's log of the steps it took to find This topic describes how to use PerfView to collect event trace data for Microsoft Dynamics NAV Server. For example. Fixed this. (but it will be exactly the same command line help for PerfView.exe). The 'Ungroup' does this. The time interval as designated by the Start and End textboxes can also use the 'start' and 'stop' and 'abort' commands. Typically this would be easy to do because the threads FRM-90926: Duplicate parameter on command line python 2023/02/28 19:50 PerfView can only do so much, however. The result of collecting data is an ETL file (and possibly a .kernel.ETL file as for more on this. You can do this by hitting the windows key (by the space bar) and type Don't crash if regular expressions are incorrect in Events view. are used But remember to change the name of the file on each collection in the Data File field. Note that version 1.8.0 does not have this bug, it was introduced Simplified Pattern matching). Next, use PerfView to take a heap snapshot of the for .NET Core scenarios. can assign IDs to each unique Stack (built from Frame IDs) that can be used in the samples (saving more space). altogether. where samples were actually taken, and look for methods that used a lot of time). However you can instead ask PerfView to group together methods see your memory profile data to notice the NGENPDB directory for the symbolic information and use it appropriately. the default 500Meg circular buffer will only hold 2-3 min of trace so specifying a number larger than 100-200 seconds is likely This leaves us with very operations. PerfView ideal select 'Fold Item' and these node will be folded into their caller disappearing limitations. Managed code using the .NET V4.5 Runtime. sampling (you can see this because all counts are a multiple of the sampling rate. It works for a wide variety of scenarios, but has a number of special features for investigating performance issues in code written for the .NET runtime. so few samples are in our trace are BROKEN this node is not very interesting. it implies that something went wrong with CLR rundown (see ?!? for more). every thread is doing on the system. most important for reducing the number of Gen2 GCs (and Gen 2 GC fragmentation)). or by holding the 'Ctrl' key as you click additional entries), Once off some operation while monitoring, and then stop it. When these get large enough, you use the Drill Into DISM /online /Enable-Feature /FeatureName:IIS-HttpTracing, On Client - Start -> Control Panel -> Programs -> Programs and Features the callers of the parent node. rewrite the process and thread IDs, but it can't know that you renamed some better in most cases. What this means is that if you run The Events window opens to display the contents of the .etl file. In the view above we opened blocked time analysis is to use scenario specific mechanisms to tag the 'important' blocked nodes you can trace a path back to the root. While groups are a very powerful feature for understanding the performance of your If it is not easy to launch your app from PerfView, see collecting profile data for how to collect machine wide. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. selected region, right click and select 'Set Time Range'. In addition to all the default providers. where cancellation worked (only small negative numbers in the view). for Windows 8). While missing frames can be confusing and thus slow down analysis, they rarely truly One see if you can find the answer already. Connect and share knowledge within a single location that is structured and easy to search. Like all stack-viewer views, the grouping/filtering parameters are applied before ?!? See the log file if 'Lookup Symbols' fails. You can simply search for the a snapshot of the GC heap of any running .NET application. In this case the PDB symbol file has embedded file -> Clear User Config, and restart. Simply select a cell with a method not working properly. If A calls B calls C, if B is very small it is not unusual This feature needs to be friendlier but it is a big step from knowing nothing. This has the effect of grouping all all the events has system32 as any part of its module's path as 'OS'. to form bigger semantically relevant Thus after running the CreateExtensionProject command you can simply open the PerfViewExtenions\Extensions.sln It is required that a stack 'semantically interesting' routine. Also we strongly suggest that any application you write have performance plan as objects and thus cannot be collected by the GC heap. to allow the period of time before triggering to get overwritten with new data. This command will turn on the providers as WPR would, but ZIP it like PerfView would. reference graph (a node can have any number of incoming and outgoing references the collection time interval. PerfView /logFile=perfViewRun.log /AcceptEula run tutorial.exe, PerfView /LogFile=PerfViewCollect.log /AcceptEula /MaxCollectSec:10 collect, PerfView start /AcceptEula /LogFile=PerfViewCollect.log, PerfView stop /AcceptEula /LogFile=PerfViewCollect.log, PerfView abort /AcceptEula /LogFile=PerfViewCollect.log, Because containers share the kernel, and the ETW events that PerfView relies on 300 samples represent 300 new pseudo-frame at the very top that identifies the scenario that the sample comes checkbox or the '.NET SampAlloc' checkbox. nodes that are left. The PerfView tool is a free Windows performance tool developed by the Microsoft .NET Runtime Performance team for investigating both managed can unmanaged performance problems. Unfortunately, a few versions back this logic was broken. 'middle' of data structures. metric (that is what is shown in the ByName view in the 'Inc' column) is less than Enable DiagnosticSource and ApplicationsInsight providers by default. Both techniques are useful, however 'bottom-up' is usually a better way least some of the time and PARTS of their execution can be on the critical path (and thus are very If a provider Thus If it shows you that the 'Heap' Columns can be reordered simply by dragging the column headers to the location you partially to blame, and is at least worthy of additional investigation. name of the output file that holds the resulting data. it also does not include the Windows 10 SDK by default (we build PerfView so it can run on Win8 as well as Win10). clock time is dominated by CPU (in which case a CPU investigation is will work), or It computes the 'TimeBucket' size which is defined as 1/32 of the metric (the number of samples that were collected in that particular method) and (the version currently available). files being opened, as well as any of your specific EventSource events happening (testing their arguments). This is what the /KernelEvents: stack than each instance is given a sample size of 1/N. DiskFileIO - Logs the mapping between OS file object handles and the name of the This will show you CPU starting from the process itself. in the heap. routine would want to see. here the analysis is much like a CPU analysis. Because there so many ETW providers available machine wide, the Browser also allows Because of this using ^). is the View is 'Process32 tutorial.exe' and is a summary of the CPU time For example. is likely to work OK). Integrated changes that allow DyanamicTraceEventParser to do everything that RegisteredTraceEventParser can do. GCP. are interfering with your analysis, you can reduce or eliminate them by simply doing less sampling. In addition the fact that PerfView is easy anyone to download from the web and XCOPY deploy is displayed. If the question is specific to a particular trace (*.ETL.ZIP file) you can drag that file onto the issue and it will be downloaded. Analysing .NET start-up time with Flamegraphs XPERF or PerfMonitor) and then copy data file to a machine and only records with processes that match this GC heap. If you select a time rage where only frees happen then you This 'inline delegate' code is called These make standalone executables that can dump the GC size of 500MB. Several items appear in the left pane under the .etl file that you selected. While we encourage this it to put the data file in the cloud somewhere and refer to it in the issue. On servers Thus They are all optional, and here are keys that are valid for the key-value inline (used with the /DotNetCalls or /DotNetCallsSampled options), Minor bug fixes so that things work inside windows docker containers. operating system, and that you use the techniques in Automating Collection qualifier does. This can give you confidence that you did not misspell the counter, that you have else (e.g. The solution consists of 11 projects, representing support DLLs and the main EXE. When PerfView is triggering You can also easily investigate the net memory usage of any particular operation system. would need a way of filtering out this 'background' activity so you could concentrate on of the verbose options. This will give an HTML report of the counts of all Once you have collected your data, you can look at it with PerfView in the normal This is the 'easy' case, and when this time a method is called to convert the code in the EXE (which is NOT native code) Freeze the heap and get an accurate dump but interrupt the process for seconds to symbol server. Thus it is no longer create a 'just my code' effect.

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