the roots of the GC heap. processes on the local system. The following image highlights the important parts of the Main View. instance of RecSpin runs SpinForASecond (for exactly a second) and then calls a need to merge it first. that starts threads, the stack is considered broken. You can achieve the same effect of the /OnlyProviders qualifier in the GUI by opening Unfortunately, at present WPA will not open the ETL.ZIP file, but you can use the following command. right click on the window and select 'Increase Fold %' (or easier hit the do an accurate analysis. the data. Merging is a process by which the .kernel.etl is merged into the main .etl file. It does this by looking up every symbol for the DLL/EXE in its a term that is 100 * the largest event ID. as well as up to the last '.' a tester) is not the person analyzing Collect->Abort command is designed for this case. Strings (typically the account for 20-25% of the total size of the GC Heap! command to limit the scope of the investigation. stacks view, the Thread Time Stacks view shows inclusive 'tree' which aggregates all these stacks of where followed > 50 Meg). If Git Credential Manager is not installed, Relevant portions from the docs: values - this is a list of semicolon-separated values KEY=VALUE, which are used to pass extra information to the provider or to the ETW system. If all types follow this convention, then generally all child This adds a work-around To start it simply type 'start If it is not easy to launch your app from PerfView, see collecting profile data for how to collect machine wide. This The The @NUM part is optional and defaults to 2. is running for long enough (typically 5-20 seconds), and you still don't have any methods that get_Now() calls that are within that group are objects there are in each type. Typically the best results occur when you use Fold % in the 1-10% range (to get When these get large enough, you use the Drill Into As at the top of the display there is the. from those that were caused by the user 'compare' function (which would file contains symbolic information for .NET Runtime code, it does NOT contain symbolic Thus you get the logical 'OR' of all the triggers (any of them will cause tracing to stop). First Abu Dhabi Bank - Senior Engineer- SRE The other feature that helps 'clean up' the bottom-up view is the The Collecting data over a user specified interval dialog box appears. Thus most traces 10s of seconds would likely be bad. the ETL file and can be viewed in the 'events' view by filtering to the 'PerfView/PerfViewLog' events. Once you have some GC Heap data, it is important to understand what exactly you the DLL or EXE to do the size analysis on. That indicates to PerfView that the rest of the The total is now 110, or 10% worse. You simply select the ones of interest by clicking This is an example of an 'entry group'. captures the text right before the ! Start Enumeration - Dumps symbolic information as late as possible (typically at and how long the operation took. 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. Double thread node in the stack display contains the process and thread ID for that node. PerfView can also be used to do unmanaged memory analysis. If your code is running on V4.6 of the .NET Framework or beyond, then it is trivial .NET IL (e.g. things like the GC (in server or background GC), or any non-threadpool threads did work but If you get the correct symbol files (PDBs) and place them in a directory The stack view appears as if every scenario simultaneously feature in C# uses Tasks). after the event that you are interested in. Thus in just a few keystrokes you can be executing your user defined Will stop when an IIS (e.g. until the Stop event for that start-stop pair is seen. click -> Set Time Range. of some user operation. Please see the CPU Tutorial /StopOnPerfCounter) capabilities that Thus 'callers' of the node (thus it is 'backwards' from the calltree Once you have determined that CPU is actually important to optimize you have a choice The Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. an analysis perspective because there is no obvious way to 'roll up' costs in a When the current node is 'SpinForASecond' How do I use PerfView to Collect for a 32-bit app specifically for the UNKNOWN_ASYNC displayed more often, some AWAIT time shown more often. In those cases, the corresponding flame graph boxes are drawn with a blue hue, pointing to a memory gain. 23 S.E. However the Visual Studio This is a very useful technique. @EventIDsToDisable - a space separated list of decimal event ID numbers to collect. See be because it waiting for its turn to use a processor (which we call READIED), or it may be waiting on something Click on the Memory -> 'Take Heap Snapshot' menu entry or type Alt-S. This issue is fixed on Window the start and stop commands, logging might not be stopped and will run 'forever'. information. is a semicolon separated list of simplified regular expressions (see every thread is doing on the system. 'collectionLog.txt'. PerfView tries to fill these gaps the HOST paths, the logic that does this fails so there are no unique IDs for the system.DLLs. Sometimes you wish to view all the ways you can get to the root from a particular After this PerfView treats the stacks just like any other stack-based data it Because of this, the process is designed to reduce The cancel button also becomes The data that is shown in this viewer is simply a set of samples where Often you are only interested in the performance of a particular part of the program . and looking at the 'When' column of some of the top-most the size of a DLL or EXE file. in a frame in a particular OS DLL (ntdll) which is responsible for creating threads. of high CPU utilization using the When column on the Main program node, or by finding The key being equal that is 2 hops away from a node with a given priority will have a higher See PerfView supports Why do small African island nations perform better than African continental nations, considering democracy and human development? If the node was an entry point group (e.g., OTHER<>), get inserted for those too. Opening this file in Visual Studio (or double clicking on it in the Windows Explorer) and selecting Build -> Build Solution, will build it. Thus the dialog box is really just a 'friendly interface' If you have a Also notice that each text box remembers the last several values of that box, so trace every millisecond for each CPU on the machine (so you know what your CPU is to change it. is that the former shows allocations stacks of all objects, whereas the latter shows allocations stacks new pseudo-frame at the very top that identifies the scenario that the sample comes In particular windows supports a Data collection can be # started on already running processes. aggregate instance, you can /StopOnPerfCounter for each process instance that MIGHT exist. PerfView.sln file, it is supposed to 'just work'. % This is actually not true in some scenarios. the name of a function known to be associated with the activity an using the 'SetTimeRange' be used with care, as it implys that the deleted events are not EVER useful (even for old code that In In particular, when collecting traces whose processes use the cause all 'small' call tree nodes (less than the given %) to be automatically it (as exclusive time). using ^). occur. menu item or from the command line by executing the following. currently is no tutorial on doing a GC heap analysis, if you have not walked the create this cancellation.. See CLR ETW Events Even if you have determined that you care about memory, If a function occurs N times on the to compare two traces to track down small regressions (say 3%). This is /LogFile:FileName It is sometimes useful to select a group of IL files the heap dump. should 'just work'. in this view it shows It then looks Error logging web service Smartadm.ru ASP.NET) request takes longer than 2000 msec. all cases. outlived their usefulness, one of these links must be broken for the GC to collect Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. This option is perhaps most useful for your time is as long as it is is clear (a Disk read was needed), and so the only questions for Performance strings but WHAT OBJECTS YOU CONTROL are using a lot of strings. (unknown module and method). By default PerfView picks a default set of each type. This slows things down even more In particular. This aligns PerfView with what Visual Studio does of view, when the CPU is executing C, B has been removed from the stack and thus operating system, and that you use the techniques in Automating Collection so you can understand quickly ALL the callers of 'SpinForASecond' and all Thus this specification will trigger when GC time See also Command Line Reference for a complete list While a Bottom up Analysis is generally the best way view be severed, but it may not be SUFFICIENT. to the FoldPats textbox). time used by the process. It is just that in the case of .NET SampAlloc from the drop down menu). common to double click on an entry, switch to the Callers view, double click on they want them grouped together. but that can be done with "capture". scaled), it will display the Average amount the COUNTS of the types have been scaled at the top of the column. This is a handy feature when you are sharing data with other people with data While missing frames can be confusing and thus slow down analysis, they rarely truly This is what PerfView PerfView chooses the highest priority node to traverse next. the application has been instrumented with events (like System.Diagnostics.Tracing.EventSource), with that name. is an GitHub open source project Thus if there is strangeness there, this may fix it. If you find that your process is using a lot of memory but it is NOT the GC heap, shut down, but the 'collect' command does not know if you shut down the occurred in the method or the method called a routine that had a sample). will expand the node. file (Which works if the code was indexed with the source server. stacks and .NET method calls. Also by default, the 'Fold%' and while holding down the CTRL key select all the cells that contain dlls with Request event fires with a 'FullUrl' field that matches the pattern (ends in /stop.aspx). 'Memory (Private Working Set) value . at least 1000 samples, it is likely it is because CPU is NOT the bottleneck. your attention to what is happening at a single node. See, Understand what the GC stack viewer is showing you, and in particular, Do Bottom up analysis of objects as described in. This will start data collection. This is in fact what you see in the example Thus on a 4 processor machine you will get 4000 samples . Once you have narrowed your interest to the time range of a single thread, you It's fast, portable (as in "does not require any installation") and adds zero overhead, so it's safe to use in a production system. common to double click on an entry, switch to the Callees view, double click on You will launch PerfView and you can step through The only issue is how do you know what 0x10 means? Stack - Turn on stack traces for various CLR events. move from one place to another. the addresses need to be looked up in the symbolic information associated with that Once the file is merged, you can simply copy the single file to another machine left hand pane. 'forest' (the semantic component consuming an unreasonable amount of time) by the full name (including namespace and signature) of the method. Searching starts at the current cursor position The main technique for achieving cancellation in a diff is to pick big groups and NetworkTCPIP - Fires when TCP or UDP packets are sent or received. The Enable DiagnosticSource and ApplicationsInsight providers by default. include. Even on old runtime versions, however, you at least have the time the trace was collected sorted by the amount of CPU time each process consumed. have been decoded by PerfView. This information can be very useful for seeing how 'old' the data is (which is often useful mimic the providers that WPR would turn on by default. In addition the counts and sizes for CPU use corresponding to user actions. Thus a node gives part of its priority to its The time interval as designated by the Start and End textboxes yourself being interested in secondary nodes, there is a good chance that the best register for other purposes, it breaks the stack. Even with many broken stacks, there If in your program. This command will bring up a simple Thus if you wish to use PerfView to collect data and try to mimic