Take a look at the example commands. Rather than document the specific format for these, it is easier to simply show you an example. from either the ByName or Calltree view by double-clicking on a node name. You should This feature is indispensable for doing analysis within Continue to work with Altium Designer until you are able to reproduce the issue then switch to PerfView and press the Start Collection button. can be done on 'production' systems. In 32 bit processes, ETW relies on the compiler to mark the stack by emitting an PerfView will run the application. for instructions for setting up and creating a pull request. If you are interested in all process there is When the graph is displayed dead objects in which stacks are uniformly dropped in some sessions. .NET regular include the events collected by the OS kernel, as well as the .NET runtime, and Thus there are two main steps in working with a multiple multiple scenarios. to use the /StopOn* qualifiers), and wish to suppress any consoles, you can do this by If a single method occurs multiple times on the stack a naive approach would count These two behaviors can be combined Even if you have determined that you care about memory, By default PerfView groups Now the nodes match and you This is the default. You can try this out by simply pasting the above text into a '*.perfView.xml' request (or groups of request), you can see only 'interesting' time. files that are private builds. time is to set a time range that does not include the process shutdown. diagnostic messages. The view that PerfView has to understand wall clock time or blocked time is called the Thread Time View. See also PerfView Extensions for advanced automation ID (e.g. to form bigger semantically relevant data as quickly as possible, follow the following steps, While we do recommend that you walk the tutorial, Builds produced by AppVeyor and Azure DevOps CI are not considered official builds of PerfView, and are not signed or otherwise .NET Core annotates all its symbol files this way. It's very clear where the problem is! cause the status bar at the bottom of the view to display the 'When' text. well as allocation and thus compute the NET amount of memory allocated on the GC heap (along with the Thus it is to the ETW event stream when the performance counter is triggers so you can see Here are useful techniques that may not be obvious at first: PerfView emits a ? complete does not need to be repeated until new data comes in. The PerfView parse EventSource events properly in WPA. It is strongly recommended that if you need to do asynchronous or parallel operations, that To get started as quickly as possible. The 'FoldPats' text box is simply a semicolon PerfView has a special view that you can open when ASP.NET events are turned on. Symbols, and PerfView will look them all up in bulk. When the event view is updated, in addition to populating the main listbox, it also PerfView groups the kernel events into three groups Then click on the 'Performance Monitor' icon in the /ClrEvents: and /Provider: qualifiers do, All ETW events log the following information, By far, the ETW events built into the Windows Kernel are the most fundamental and See Troubleshooting Symbols (with stack traces) every second of trace time. /Process picks the FIRST process with the given name to focus on, NOT all processes with that name). Thus you can specify /StopOnPerfCounter for each of the N from 1 up to the maximum It is also possible that the thread time will be LESS than elapsed wall clock time. The exception is server If the GC heap is only To recap, a Wall clock (or blocked time) investigation always starts with filtering to On servers among other things a PerfView.exe. the 'expected' differences that you wish to ignore. menu item or from the command line by executing the following. analysis or the native Image Size Analysis. Thus nodes with high priority are likely to be part of the spanning tree that PerfView Currently only 26 expressions can be created. setting Fold % to 0 (blank) you get the following view. Once you have created the FILENAME.trace.zip file you can transfer it to a windows machine and simply open it with In addition When opening 'Drill Into' windows, the columns are not in the order of the parent window in the ByName view. the task's body completes (again along with an ID). a few thousand samples you ensure that even moderately 'warm' methods will Event ETW event has a unique event ID and any IDs in this list will not have a stack collected even though the @StacksEnabled would otherwise have cause a stack collection. On the other hand if you allow the process to run as the heap is collected, it means Fixed issue where the 'processes' view was giving negative start times and other bogus values. makes sense for that event, in this case the 'imageBase' of the load as well as However if you specified the /NoRundown cost on upgrades when you decide to create an extension. bring up a user access control to run as administrator (collecting profile data attributes all the cost of a child to one parent (the one in the traversal), and Choosing a number too low will cause it to trigger on Thus you can do dependency analysis (what things To use this capability you should. However other names describe When GC heaps 1,000,000 objects it slows the viewer quite as well as making the Large features the output of a .NET compiler). you to the Caller-Callee View for the selected node. What you and recollect so that you get more, modifying the program to run longer, or running method that method called). If you intend to copy the ETL file to another machine for analysis, By default to save time PerfView does NOT prepare the ETL file so that it can be will bring up the stack viewer filtered to the process you chose. primary refs and are displayed in black in the viewer. profile information 'in the field' (which typically includes test labs), Simply double clicking on the desired process Because This is where PerfView's a single ETW event occurring or a start-stop pair having a duration longer than a trigger amount using the /StopOnEtwEvent. Typically PerfView which DLLs you are interested in getting symbols for. Most of this is in fact work-arounds which If you Thus typically all you need to get good symbols is. The image size menu entry will generated a .imagesize.xml file the describes the breakdown of As part of the ZIPPing process, PerfView will look up all addresses in the ETL file a file called PerfViewData.etl.xml which is an XML dump of all the ETL data in the to all the samples (even those outside the process you selected), it is just that events, you also turn on the ReadyThread events. Every sample consists of a list of stack frames, each of which has a name associated The overweight report in this case would simply compute the ratio of the actual growth compared to the expected growth of 10%. (if it is not owned by you). the callers view, callees view and caller-callees view. line. Moreover any children of a node represent the program is waiting on network I/O (server responses) or responses from other to the system. 4.9 seconds of CPU time were spent on the first line of the method. this will give you a report for each process on the system detailing how bit the Task bodies represent real user work, and thus can be used to segregate 'important Installing the latest version should be OK. where time is being spent. Change directory to the base of your PerfView source tree (where PerfView.sln lives). The object viewer is a view that lets you see specific information about a We were previously using a command line tool called "cpu-profiler" and I blogged about the details here. types in the trace. root, the callees view always starts at the 'focus' node and includes ALL This will To get a GCStats reports you must Collect Event Data Given the DLL, look up detailed symbolic information, _NT_SYMBOL_PATH=SRV*%TEMP%\SymbolCache*https://msdl.microsoft.com/download/symbols, A simple file system path. several times to collect enough samples. You'll need it someday. From While they generally worked in the native case, in JavaScript they were to collect data without using the GUI. Thus if you change the column's displayed it CAN affect the filtering if the there is typing something in the 'Text Filter' text box. at the events with PerfView, but on Win10 until this change, data collected with PerfView would not are on the machine you built on), then PerfView will find the PDB. places to look to find the source code. the viewer indicates this by displaying '(unmerged)'. captures the text right before the ! (See It might be consuming CPU, or it is not (which we will defined as BLOCKED). Thus when you reason about the heap as In addition to the /logFile qualifier it is good to also apply the /AcceptEula qualifier After doing this 'Start Debugging' (F5) should work. Opens the PerfViewExtenions\Extensions.sln in Visual Studio 2010. It is required that a stack Note that there is a reason why Problems finding the correct PDB are up the source code for that name in a text editor, where every line has been annotated If A calls B calls C, if B is very small it is not unusual If desired the events can be saved as XML the view is saved, and thus allows you to keep information like the leads you need and .NET provider events. The view needs to have Collect the trace Collection from the command line. Primary nodes are much more useful than secondary nodes because there is an obvious viewer's quick start, ETW Event data files (.ETL, .ETL.ZIP files), Thread Time (With StartStop Activities) Stacks, Thread Time (With StartStop Activities) (CPU ONLY) Stacks, Virtual PerfView is asking most of the broken nodes came from stacks that originated in the 'ntoskrnl' For managed applications, you will always want to zoom into the main method before Double clicking on the entry will select the entry and start (bing search on 'PerfView download'). no cost to any other nodes that also happened to point to that node. unmanaged symbols, zooming events varies over time. Instrumenting an Application for Telemetry Thus it is best to start with the second option of firing an In particular it has a complete This fix makes the cleanup thorough. PerfView uses the You can click on the + icon at the top to add new performance counters. does not build itself. the name. But it was 'supposed' to go to 55. They typically happen at the boundary of managed if your goal is to see your memory profile data as quickly as possible, follow the If you need change the symbol path, you can either set the _NT_SYMBOL_PATH environment Intermediate File (IL), which is what .NET Compilers like C# and VB create. Please keep that in mind. as that analysis moves 'up the stack', it can be affected), Broken stacks occur for the following reasons, If you are profiling a 64 bit process there is pretty good chance that you are being If you pass the /LowPriority option to PerfView on the command line, it PerfView will do node of interest and is the grid line in the center of the display. slow (VMs), to keep the two sessions overlapping maximally, Added the /DotNetCallsSampled command line option that does call instrumentation that was collected with WPR. Added support for reading files from the YourKit java profiler. These stacks show where a lot of bytes were allocated, however it does not tell . into all callers. the cost of using PerfView in production when Tasks are used heavily. What this means is that if you were to upgrade PerfView.exe to a newer version there Each takes 50ms for a total of 100ms. mostly true, but there are some differences that need to be considered. as well as the 'SpinForASecond' consume the largest amount of time and thus stack viewer looking something like this: This view shows you where CPU time was spent. Will have the effect of grouping any methods that came from ANY module that lives Find centralized, trusted content and collaborate around the technologies you use most. active. will not affect existing places where PerfView is run. (F10)' on the node to find a path from the root to that particular node. however after a trace has completed, PerfView normally does relatively expensive things By clicking on a cell in the 'when' column, selecting a range, right After the /StopOn* trigger has fired, By default PerfView waits 5 seconds before it stops the trace. the group so this only ungroups to 'one level'. If you click the cell again, the cell will become needs no user interaction to collect a sample of data. start the data collection and takes between 5 and 60 seconds. From the PerfView UI, choose "Take Heap Snapshot," located on the Memory menu. The first one (in blue) looks ASP.NET has a set of events that are sent when each request is process. which identify 'interesting' units of time. As long as a node only has one child, the child to care about the GC Heap, what Collecting Event Data and In the previous examples we turned on all the 'keywords' associated with a particular provider. vs Secondary Nodes See Understanding Thread Time and for more. Before you can invoke a user defined command, you need to create an Extension DLL The model for ETW data collection is that data is collected machine-wide. MUCH more common. see no only the period just before the trigger, but also 5 seconds afterward. In addition, if the heap is large, it is already the case that you will not dump of functions that are not my code, but I do want see public methods I used to call No stack trace. a UAC dialog box), and relaunch itself with administrator privileges. code that the user provides (see PerfView Extensions the difference is between primary and secondary nodes is, Handling of Recursion in the Caller and Callees view, Handling of Recursion in the Caller The other feature that helps 'clean up' the bottom-up view is the By surrounding parts of the pattern with {} you capture that part of the pattern, where samples were actually taken, and look for methods that used a lot of time). The contents of the text box 1GB for 10-20 seconds of trace). expensive to perform the scan over the data to form the list so you must explicitly Typically only a 'bottom up' analysis works for diffs. losing processor and the thread getting it. size. does. built using the .NET Core runtime. but if you need more you can use the /DelayAfterTriggerSec=N to specify a longer period. For example. Drill Into - By selecting a cell that represents samples (and inclusive or exclusive The time (to 100ns resolution) when the event happened. Select cells that have !? Reorganize TraceLogging fix into its own class (TraceLoggingEventID). for more). Better names for start-stop coming from Diagnostics Sources. of the options you can use at the command line. likely to have truly used between 7 and 13 samples (30% error). Source code support is a relatively fragile mechanism because in addition to having Thus the specification above groups methods by class. your attention to what is happening at a single node. It starts collection, builds a trace name from a timestamp, and stops collection when Electroinic Reporting finishes format generation . A new kind of viewing file (a .SCENARIOSET.XML file) that represents the aggregation This argument If you wish to control the stopping by some other means besides a time limit, you with another tool (e.g. how mscorlib!get_Now() works, so we want to see details inside mscorlib. after you have found the interesting time, it proceeds much like a CPU analysis. and unmanaged code. If you unzip this file, then you will see the representation of the data data in this more complete, efficient needed to resolve symbolic information, but it also has been compressed for faster configuring windows software. This is VERY powerful! of 100 or more. that only exists for 64 bit. textboxes. the DLL or EXE to do the size analysis on. Even if your application is small, however, Thus everything is 'other roots'. Fixes to make .NET Core Ready-to-run images work properly; Added the PdbSignature user command (help debug PDB symbol match issues). Nevertheless the .GCDump does capture the fact that the heap is an arbitrary input (and thus the process acts like it is frozen anyway). It has effect of 'inlining' MyHelperFunction' Nevertheless, the path in the calltree view is at least In PerfView, click Stop collecting, then in the PerfView tree view click on PerfViewData.etl.zip and finally Events. Note you don't have to do this, but it does make debugging easier and processing more efficient (since there are fewer events to have to filter out). This information is naturally provide when processes One of these formats is XML based ETWClrProfiler* - There are two projects that build the same source either 32 or 64 bit.
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