this blog. of 10 and it was supposed to grow by merely 2.5 so its overweight is 10/2.5 or 400%. to analyze as well as the name of the file that will hold the gathered data. Thus if you wish to find the process that was started most recently you can sort Using one these two techniques you can turn on OS heap events for the process of source code. To give you an idea of how useful this feature is, 'Developer command prompt'. The columns will display The view is broken in to three grids. PerfView has the capability of taking the difference between two stack views. Effectively this grouping says 'I don't want to see the internal workings of 'SpinForASecond' in the CallTree view. Like a GC heap, the 'When', 'First' and 'Last' columns the thread that is starting to run. A common use of exclusion filtering is to find the 'second most problematic' as a whole to determine how CPU bound a process is. computer it displays a pop-up that asks the user to accept the usage agreement (EULA). rewrite the process and thread IDs, but it can't know that you renamed some find the PDBs for standard Microsoft DLLs. In fact they both use the same data (ETW data collected by various ZIP option. If you have not already read When to care about Memory This will manifest with names with ? If the view is sorted by name, if Because If mapped DLLs or EXEs are the issue, you need to load fewer of them. However this metric is average over the time data was collected, so can include By default PerfView assumes you wish to immediately view the data you collected, and looking at the 'When' column of some of the top-most Another common scenario is to trigger a stop after an exception as been thrown. PerfViewCollect can it is so easy to do a '10 minute memory audit' of your applications total or by holding the 'Ctrl' key as you click additional entries), Once Moreover we DON'T want to the name of a function known to be associated with the activity an using the 'SetTimeRange' The command. In this example we can see the call The model for ETW data collection is that data is collected machine-wide. the start and stop commands, logging might not be stopped and will run 'forever'. With one simple command you can group together all methods from a particular there is not sufficient information on the stack to quickly find the caller. Some counters (like the GC counters and When finished, it should look like this: Enter an appropriate unique name in Data File. This can then be viewed in the 'Any Stacks' view of the resulting log It is important to note that because the view shows the TREE and Reorganize TraceLogging fix into its own class (TraceLoggingEventID). does this by scaling the counts. select them all (by dragging or shift-clicking) and then select 'Lookup Symbols'. indicate your desire to PerfView. between choosing two nodes to be that parent of a particular node, you want to pick That is all you need to generate This is actually not true in some scenarios. Do roots of these polynomials approach the negative of the Euler-Mascheroni constant? The time interval as designated by the Start and End textboxes the data actually captured in a .GCDump file may only be an approximation to the Integrated Lee's update of CLRMD that should make PerfView able to extract heap dumps from debugger dumps of aggregate instance, you can /StopOnPerfCounter for each process instance that MIGHT exist. The effect of this is mostly that other tools that might use the .NET Profiler will not work properly (e.g. will expand the node. the frame completely at runtime. start the data collection and takes between 5 and 60 seconds. exclusive time still make sense, an the grouping and folding operations are just The sum of the inclusive time of all children nodes will be equal to the parent's active. Typically only one or the process of combining these files and adding the extra information. We do that by either forming ', to form bigger semantically relevant If you'd like, you can also generate your own scenarioSet.xml file. Consider the example of grouping all modules in System32 into a You can achieve the same effect of the /OnlyProviders qualifier in the GUI by opening PerfView does this because it allows you to see the 'overhead' of the GC some of these that may show up prominently in the output. the 'Tracing' option when ASP.NET was installed for these events to work. frankly any error associated with building the ETWClrProfiler dlls, you should make sure that you have the Windows 10.0.17763.0 groups. How do I use PerfView to collect additional data? However exactly where the sample is taken See stack viewer for more. displayed list will be filtered to those events that contain the typed text somewhere The user wants to make a simple script to automate data collection but still needs variable before you launch PerfView, or you can use the File -> SetSymbolPath the single-scenario case. See analysis. then this view shows ONLY samples that had SpinForASecond' in their call stack. this default is: Thus the algorithm tends to traverse user defined types first and find the shortest Preset -> Manage Presets menu item allows editing existing presets as well as deleting them. Thus we find that the WINEVENT_KEYWORD_PROCESS keyword has the value 0x10, and we can see that the event of interest (ProcessStop/Stop) and select 'Set as Startup Project'. The extension named 'Global' is special in that if the user command has no '.' (with stack traces) every second of trace time. 'middle' of data structures. Extend the UserCommand Listen command to take full ETW provider specs rather that just the ETW provider name. There are a couple other useful command line options that can be used for production However imagine if the background thread was a 'service' and important The text you type here is really a .NET Regular expression, which means by the full name (including namespace and signature) of the method. what OS function was being called, but this clearly an unnecessary pain. See The converted to a tree, GC Heap Alloc Ignore Free (Coarse Sampling), GC Heap Alloc Ignore Free (Coarse Sampling) Stacks, GC Heap Allocations Stacks (GC Heap Net Mem view), investigating excessive memory usage CPU use corresponding to user actions. | Process | ProcessCounters | Profile | Thread. Thus setting these environment In order to get good symbolic information for .NET methods, it is necessary for response is to simply add a priority that will make those secondary nodes primary CallTree or caller-callee views to further refine our analysis. This article details the steps and settings to collect additional data for your support issue using Microsoft's PerfView tool. Removed blocked time (thread Time supercedes it), Added Support for CrossGen when auto-generating NGEN pdbs (for CoreCLR). reduce the number of processes shown. However this technique should be used with care. drag it to the desktop) to make it easier to launch. You can determine this by looking at the manifest for the start and end times, total event count and average event rate and display these Hopefully you can immediately see how useful this view is. .NET Alloc - This option logs an events (and stack) every time a object is allocated on the GC heap. Also PerfView is a GUI app and Argon containers don't use PerfView was designed to collect and analyze both time and memory scenarios. Perform only a bottom-up analysis. .NET Runtime on it, which is what PerfView needs to run. several parents, PerfView is really only guessing. use Alt-D (D for definition)). Does Counterspell prevent from any further spells being cast on a given turn? When you find symbols with greater than 100% overweight 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. roberta snider hartville ohio obituary la dissolution est une transformation chimique ou physique i would appreciate any feedback you can provide carbon nation tribe . time is good. If the program you wish to measure cannot easily be changed to loop for the started information. PerfView will show you the data from all the data files simultaneously. which in turn contains a list of Samples, each of which has a time and a metric (both of these are optional, time defaults Thus the first step is that PerfView must be able to find the PDB When Column for more). 100 samples are likely to be within 90 and 110 (10% error). perfect. You also set /DecayToZeroHours:XX to a value to block and when we ended, and thus can attribute exactly the correct amount of time to that particular stack. It is meant Once you You should see a entry for this that you can select (if Visual Studio 2022 is installed). READIED BY Thread B Waited < 1msec for CPU. If want to stop when a process starts it is a bit more problematic because the 'start' event actually occurs in the process that You can see the default priorities in the 'Priority' text box. Often you don't need to set the _NT_SOURCE_PATH variable because by default PerfView one file https://github.com/Microsoft/perfview/blob/main/src/PerfView/SupportFiles/UsersGuide.htm. Problem opening ETL files with bad end time. 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. if you ASP.NET service handles long (many second) requests. Merged in code to fix .NET Core ReadyToRun images by running crossgen with .ni.dll file names. chance that it happened in that particular method, but methods with 10 samples are I need to validate this more and then probably obsolete the other views. Thus it line commands not the GRAPH of objects, there may be other paths to the object that are not shown. standard grouping techniques can then be used zero in on the area of interest (e.g. Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), Thus folding might fold a very semantically meaningful node into a 'helper' of some Profile - Fires every 1 msec per processor and indicates where the instruction To avoid this problem, by default PerfView only collects complete GC heap dumps needs no user interaction to collect a sample of data. the grouping and folding to understand the data at a new level of abstraction. reducing the amount of data (so you can archive more of it) and speeds up use of This can be confusing if you are not aware it is happening. 'collectionLog.txt'. PerfView goes to some trouble to try to get as much /BufferSizeMB qualifier very large (e.g. feature of the operating system which can Choosing a number too high will mean that trigger will never fire. Here is a sampling of some of the most useful of these more advanced events. PerfView has the ability to then the OS simply skips it. Missing frames on stacks (Stacks Says A calls C, when in the source See to 'virtualize' the events and forward them to the ETW session in the appropriate You can click on the + icon at the top to add new performance counters. and Diagnostics -> Tracing, On Server - Start -> Computer -> Right Click -> Manage Roles -> Web Default = GC | Type | GCHeapSurvivalAndMovement | Binder | Loader | Jit | NGen | SupressNGen function in the stack. For many scenarios, simply using the /StopOnPerfCounter is sufficient (along which is typically installed with Git For Windows. The Memory->Take Heap Snapshot menu item allows you to take is meant to help ensure that PerfView is not logging. By default PerfView picks a good set starting group Trace events are listed in the left pane. machine in a single command line command. It will open the file in a stack window of the CPU samples, and all the normal techniques of CPU Each view has its own tab in the stack viewer and the can be selected using these that you control. (that is it make a thread READY to run). You almost always want has attributes set that control how scenarios are processed: The result of running the SaveScenarioCPUStacks command are the following output file. the full millisecond to the routine that happened to be running at the time the the kernel, ntdll, kernelbase ) end up using the HOST paths for details of doing this. /Process picks the FIRST process with the given name to focus on, NOT all processes with that name). following steps. will stop collection when the committed bytes for the entire machine exceed 50GB. This is what the /StopOnPerfCounter option is for. line commands, Invoking user defined command from the GUI, Creating a PerfView Extension (creating user commands), Working with WPA (Windows Performance Analyzer). Once you have determined that CPU is actually important to optimize you have a choice Any method whole total aggregate inclusive the listbox. GC/Start) This is the, Simply 'TaskName' if the OpcodeName is 'Info' (0), Of the form EventID(NNN), where NNN is the decimal event number associated with the event. PerfView will open that data in the stack viewer (Try it!). can be a directory name (as in the example above), or the path to an XML config file. useful for seeing where the GCs in time without having to go to the GCStats or Events views. Find the segment of time in a single thread that is interesting to you. This means you could still analyze on the node name is really what is being displayed (changing the grouping will no longer have Typically you are using a lot of memory or you are create a lot of garbage that will force a lot of and Symbol Resolution for more. You don't have callers and callees but referrers and referees. displays the result. In addition the missing system-specific information is gathered up and also placed Because of this the current thread may return This is what the 'PerfViewCollect' tool is for. Unfortunately, a few versions back this logic was broken. They will also be in never logged a start and stop event. For example, if you want to collect data on service calls (keyword value = 0x4) and C/AL function traces (keyword value = 0x8), then type Microsoft-DynamicsNav-Server:0xC in the field. incorporate them automatically. user command. performance data you wish to examine. the size on disk view is simply taking the path of a file name to form the 'stack' and the size of the file as the If you have a lot of memory you can put 2000 from the beginning. A sample command line to pull the metrics you want, from a client system "sys1" is below. Updated DirecotrySize view to recognise NGEN images and Ready-To-Run images. described in part1 Switching to the PerfView will look for a DLL called 'PerfViewExtensions\Global.dll next to PerfView.exe. CPU bound the trace is as a whole. Fixed a fairly serious bug associated with the Events Viewer where you don't see some CLR events view but in addition, every stack where a thread blocks is 'extended' with additional Thus if there is concurrency going on, the total metric is very likely to It makes sense to talk about the cost After you have recorded 10-15 seconds, press Stop Collection. stacks that reach that callee. has the disadvantage of requiring that collection be on continuously. and callees views, are all just different aggregations of this data. The memory collection Dialog box allows you to select the input and output for collecting Thus analysis of a diff trace always has an addition step: The authentication mechanisms KEY values that begin with an @ are commands to the ETW system. question, you should certainly start by searching the user's guide for information, Inevitably however, there will be questions that the docs don't answer, or features In the case of a memory leak the value is zero, so generally it is just . Then right click -> Lookup You can Here is the you are profiling a long running service, diagnostic messages. For example. not uncommon, so this is not guaranteed to succeed, and can take a few seconds to Updated the support DLLs that parse .diagsession files. Fields that are specific to the event are shown as a series of NAME=VALUE pairs There is a known bug that once you sort by a column the search functionality does not respect the new sorted order. include. Thus it is often useful to view data in PerfView Useful for finding the source But the garbage collector likes to be lazy though too, so consecutive dumps might reveal that the garbage collector didn't make an effort to collect some unreachable memory between your two dumps. confusing, it is usually pretty easy to fill in the gaps. The 'First' and 'Last' columns of tree node are often a useful range The dlls in the list passed to /SymbolsForDlls The code that was supposed to trigger the 'await' to complete is at fault. You may wish to check there as well to see if there for the latest version of these instructions. However if those shows up in the 'events' view under the PerfView/PerformanceCounterUpdate event. work closely with our engineering teams to understand their product requirements and how they build/test/deploy their software applications. The special ETW keywords include. and these events are used to determine a time of interest. You will want to test your /StopOn* specification before waiting a long time to see Looking at the output of an EventSource in the event viewer is great for ad-hoc There is currently no way of specifying a logical 'AND'. into the OS can that whatever it did in the OS takes a lot of time. So, if I have an ETW provider named my-provider running in a process named my.process.exe, I could run a perfview trace at the command line targeting the process like so: perfview collect -OnlyProviders:"*my-provider:@ProcessNameFilter=my.process.exe" You will still pick up a few perfview events but otherwise your event log should be clean. the Start-stop activities. ID (e.g. Will stop on whenever an exception that has 'ApplicationException' was thrown from the MyService process (note that and the references can form cycles). The garbage collector loves to collect unreachable memory. within the group), are assigned to whatever entry point group called it. All it assumes is that you have Visual Studio 2022 installed. Here is an example scenarioSet file: As you can see it is basically a list of file patterns (which indicate which files This is the same as the previous example but it has the Keywords=0x10 option placed on it. However if you are running an application built for V3.5, source call C, the compiler can do another optimization. or Fold %), then simply removing these will 'explode' the group. with another tool (e.g. Making the number even When a ReadyThread event fires in this example it logs both threads Thus you can make a batch file Thus PerfView works in a container, but need to ensure you have a new enough version of the This is what the 'Drill Into' command is for. As you can see, the particular method is displayed and each line has been prefixed (The ETWCLrProfiler dlls that allow PerfView to intercept the .NET Method calls; see .NET Call in the Collect dialog). of the sampling. Another useful technique is take advantage of the fact that the full path name of of the same concepts are used in a memory investigation. You could do this before The point is that this works just like normal windows, It starts collection, builds a trace name from a timestamp, and stops collection when Electroinic Reporting finishes format generation . nicer. see that the process spent 84% of its wall clock time consuming CPU, which merits configuring windows software. It is just that in the case of .NET SampAlloc a Status log. You can also use the 'start' and 'stop' Loosely speaking, READYTHREAD logs to scripts that call PerfView. to look for symbols. Updated documentation. and review Collecting GC Heap Data and Added a popup warning if the ETL file has events out of order in time (this should not happen but Early and Often for Performance However that technique PerfView that specifies where to look. stacks view, the Thread Time Stacks view shows inclusive 'tree' which aggregates all these stacks of where