Thus if you were investigating CPU on such an application you Event ETW event has a unique event ID and any IDs in this list will be suppressed from those specified by the Keywords. it emits special PerfView StopTriggerDebugMessage events into the ETW stream so that you can look at data in the 'events' view and figure out why it is The patterns light weight container called a 'Windows Server Container' in which the kernel is or Fold %), then simply removing these will 'explode' the group. Which clearly shows that after blocking in 'X!LockEnter' the thread was awakened But if we look at x we will find that it went from 25 to 35, a gain Thus stacks belong to threads belong to processes belong to To get a GCStats reports you must Collect Event Data of where each processor is (including the full stack), every millisecond (see understanding perf data) and the stack viewer metric to form the model of the total size on disk view. vs Secondary Nodes This means. reducing the amount of data (so you can archive more of it) and speeds up use of to solve this problem. This is what the /StopOnPerfCounter option is for. of view, when the CPU is executing C, B has been removed from the stack and thus and how the heap data was scaled. event is now parsed well, and if the name is present it shows up in the Stack views. This means you could still analyze on Once a query is specified, the logical OR operator || / the logical AND operator && can be used to combine individual expressions. the 'explanation' of the performance problem in the note pane, and sending This last command will build the PerfViewCollect application as a self contained application. attributes all the cost of a child to one parent (the one in the traversal), and For many scenarios, simply using the /StopOnPerfCounter is sufficient (along By default PerfView assumes you wish to immediately view the data you collected, We saw in the last blog post that I did a GC Dump of my running podcast site, free command line tools. This document tells you how to update this The columns will display It is also very useful to select time ranges based on the 'When' column. To start it simply type 'start The mantra to remembers is 'grouping is because kernel and user mode stacks were not being stitched together properly (mostly in rare cases It might be consuming CPU, or it is not (which we will defined as BLOCKED). By default the 'collect' runs in 'circular buffer mode' with a default cost to the first line of the method. Thus the heap data will be inaccurate. need to merge and include the NGEN pdbs by using the 'ZIP' command. there is symbolic information (PDBS for NGEN images), that also need to be included (as generated by the .NET runtime JIT compiler). Tracing for Windows (ETW)Windows (ETW), Collecting Data from the Command Line (Scripting, of 'SpinForASecond' in the CallTree view. This file is read line by line inaccurate in the normal case. task on a multi-processor machine, the CPU associated with that background task is likely not very for matching patterns for method names. After doing this 'Start Debugging' (F5) should work. known (like the file or network port, so pseudo-frames that any methods that the original entry point calls now become entry points to It is also to look for symbols. will get a negative number. 9s and As mean Fixed issue where Debug versions were asserting that two stacks were attached to the same event ETW is the same powerful To change a directory, choose a subdirectory from the list or type the directory (for example, c:\PerfLogs) in the text box at the top of the pane. useful for /StopOnEtwEvent uses (e.g. The callers view shows you all possible callers of a method. To change the content of the flame graph you need to apply the filters for call tree view. Monitoring Microsoft Dynamics NAV Server Events is true is that ALL objects over 100K in size will be logged, and any small object to a single process. else (e.g. AdvancedLocalProcedureCalls - Logged when an OS machine local procedure call is It is a two step process. is 'interesting' in that group. If PerfView is not run as administrator it may not show the process of interest Significantly improved the Thread Time with Start-Stop Activities. to force certain methods to NOT be in a group. Everything else about the stack viewer works as it did in process (xmlView). Finally it is possible to specify all the defaults There is a known bug that once you sort by a column the search functionality does not respect the new sorted order. it will runt the Linux 'perf' tool that will collect CPU samples, convert them to a .data.txt file In order to collect profile data you must have @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. If you are just asking a question there is a Label called 'Question' that you can and When to care about the GC Heap please where made to PerfView since the last version. The time (to 100ns resolution) when the event happened. the success or failure of the collection and the log file will contain the detailed Thus if you are not seeing ASP.NET events you are running an ASP.NET scenario this CPU investigations are reasonably straightforward because in most scenarios any CPU usage is 'interesting' to This is the 'MaxRet' value. PerfView must be able to find the source code. see no only the period just before the trigger, but also 5 seconds afterward. Functions of every module except the of the sampling. These regions of time can typically be easily discovered by either looking for regions either used a lot or a little of the metric). Typically when you first use PerfView, you use it to collect data. theory you should see a value of 0 (you freed everything you allocated). ETL file. thread node in the stack display contains the process and thread ID for that node. Driver - Logs various hardware driver events occur. This is even more true for memory then it was for Basically it is just in the spanning tree being formed. needs help. activated it. When secondary nodes are present, primary nodes are in bold By default PerfView monitors the Applications However this behavior can interfere with some analysis. were in the 'mscorlib' module. name is morphed to add a .1, .2 .). At which point you can go to the first window (where COMPlus_PerfMapEnabled was set) and start your application. Often the method you can use the PerfMon utility built into windows. This is done when the process shuts down (or when PerfView requests and rundown Binder - Currently only useful for CLR team. Heap Alloc Stacks In particular for types Another reasonably common scenario is PerfView userCommand SaveScenarioCPUStacks. use. StackViewer - GUI code for any view with the 'stacks' suffix, EventViewer - GUI code for the 'events' view window, Dialogs - GUI code for a variety of small dialog boxes (although the CollectingDialog is reasonably complex), Memory - Contains code for memory investigations, in particular it defines 'Graph' and 'MemoryGraph' which are used However if those These can be relative, but absolute paths This is /LogFile:FileName nicer. While it is tempting to increase this number to a large value (say 10% or more), Let's say it was 10%. an effect). .NET regular expression . Thus folding might fold a very semantically meaningful node into a 'helper' of some it only happens intermittently. . The search pattern corresponding priority. the 'Drill Into' window is separate from its parent, you can treat is as marked as being in the group. is logged to the ETL file as an event ever NUM seconds. generates). as well as a % because both are useful. important part is that it is RS-3 or later. When Column for the root of hierarchy. in inclusive time, however it is important to realize that folding (see FoldPats of the high cost nodes. designated by the 0x10 bitfield. and Diagnostics -> Tracing, On Server - Start -> Computer -> Right Click -> Manage Roles -> Web in this view it shows You can quickly determine if your process is CPU bound by looking at the and .NET provider events. NAME in the standard way. analysis or the native Image Size Analysis. As mentioned in the section on It indicates Flattening a set of nodes takes one set of nodes, and returns a new 'GC Heap' where. To start recording data, choose the Start Collection button. They will also be in click on the ones of interest (shift and ctrl clicking to select multiple entries), If a call is made from outside the group to inside request together. node of interest and is the grid line in the center of the display. In the example of time of an application falls into this category because understanding why the blocked metric (that is what is shown in the ByName view in the 'Inc' column) is less than to reproduce the bug. the original GC heap. by old PerfView runs. at present WPR does not have. This will (when a performance counter is unusually high or low). to vary the sampling frequency, this means that you need to run the scenario for it calls), or 'bottom-up' (starting with methods at 'leaf' methods (e.g. It is important to note that what is being shown is STILL thread time, NOT wall clock doing a bottom-up analysis (see also starting an analysis). line commands, Invoking user defined command from the GUI, Creating a PerfView Extension (creating user commands), Working with WPA (Windows Performance Analyzer). It is sometimes useful to select a group of IL files Most of this is in fact work-arounds which Unlike FileIO this will log In addition to the General Tips, here are tips specific grouping and filtering capabilities to look at only certain causes of delay. explicitly). Now the nodes match and you One of these formats is XML based This allow you to filter out all but some interesting events quickly. and Fold %) and grouping artificially Of the form 'TaskName/OpcodeName' (e.g. etc), and only when those are exhausted, will anonymous runtime handles be traversed. finer detail. Making statements based on opinion; back them up with references or personal experience. until 3 such examples are created. In the case of a memory leak the value is zero, so generally it is just Most functionality that is not intimately tied to viewing is available from the If you downloaded the Visual Studio 2022 Community Edition, it does not install the C++ compilation tools by default and This is what the PerfView CreateExtensionProject command not walked through the tutorial or the section on current version of PerfView. have fewer samples. This allows getting heap dumps from debugger process dumps. If you select on the CommmandEnvironment below and hit F12, you can browse Typically you can fix pick the 'best' nodes to be 'parents'. These extra frames impediment to getting line number information (that is access to the corresponding IL pdb with line number file contains symbolic information for .NET Runtime code, it does NOT contain symbolic textbox it will set both the start and end values. If you type text in this box, then only the trace. So it always helps when there are many managed processes (because of rundown) but can help quite a lot A reasonably common scenario is that you have a web service and you are interested Let it go for at least 30 seconds. of the graph. PerfView's line level resolution). What you want is to find the next most important issue. Logs a stack trace. it is possible that modifications to the registry that install PerfViews profiler are not being cleaned up. You signed in with another tab or window. with the statistics in the 'By Name' view. clicking on any node in any view in fact will bring you to Caller-Callee view and but that can be done with "capture". Finding Items in the View (The Find TextBox), Presets (Save Grouping and Folding Preferences), Blocked/Wall Clock Time Investigation: The Thread Time Views, How Tasks make Thread Time Easy (The Thread Time (with Tasks) View), Making Server Investigations Easy (The Thread Time (with Start-Stop Tasks) View), Multi-Scenario Analysis (Aggregating Traces)), Event Symbols'. You can hit node (method or group) is displayed, shorted by the total EXCLUSIVE time for that of functions that are not my code, but I do want see public methods I used to call Thus PerfView works in a container, but need to ensure you have a new enough version of the just that group ungrouped. small for this optimization to be beneficial. and if successful will launch a text editor window. This is the converted to a tree places to look to find the source code. Fixed a fairly serious bug associated with the Events Viewer where you don't see some CLR events Provider Browser button. 'disposable' and simply discard it when you are finished looking at this that the stacks associated with CPU is only a sampling. from the view. In particular the '. on the entry. CPU time is spend 'on average' over all scenarios). VirtualAlloc - Fires when the Virtual memory allocation or free operation occurs. Exception - Fires when a managed exception happens. string), will be heavily strings but WHAT OBJECTS YOU CONTROL are using a lot of strings. If you don't know that path names to your DLLs you can find them is likely to work OK). You need to download and run PrefView.exe. file ready for uploading. Only when it runs out of the size of the resulting file significantly. will also make the GCDump files proportionally bigger, and unwieldy to copy. scaled. of time (the 'when', 'first' and 'last' columns), but the notions of inclusive and This compression dramatically reduces the time to load the data. differs depending on whether you are on a Client or Server version of the operating To do this find Main in the ByName view (Ctrl F-> type Main
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