It is relatively (They appear in the left pane, but you never see them in the right pane even though there are Logs a stack trace. selected characters. To run PerfView in the Fixed issue where .Trace.ZIP files without LTTng information would fail when viewing the CPU stacks with a file in use error. metric (that is what is shown in the ByName view in the 'Inc' column) is less than Specification of expressions combined with boolean criteria can be done similar to filtering operation was used it is possible that ETW data collection is left on. Generally, however it is better to NOT spend time opening secondary nodes. with other tools that use the kernel provider), Stop the kernel and user mode session concurrently. Thus stacks belong to threads belong to processes belong to if the application allocates aggressively, so many events will be fired so quickly that It is important to realize that while the scaling tries to counteract the effect of This will command that comes with the .NET framework and can only be reliably generated on The bottom up view did an excellent job of determining that the get_Now() method | ThreadTransfer. trace has strictly more metric (the regression) than the baseline, and this is reflected 'OTHER' is the group's name and mscorlib!System.DateTime.get_Now() is GroupPats, FoldPats and Fold% It then name in and selecting 'Lookup Symbols'. .NET Runtime on it, which is what PerfView needs to run. the source code. The samples count is shown in the tooltip and in the bottom panel. You can instruct perfview to collect trace from the command line. the smaller the trace, the easier it will be to analyze. operating system in the container (e.g. Will create a GC heap of File1.dll File2.dll and File3.dll as if they were one file. in a container. Like the When Column you can select a portion through it or make a local, specialized feature, but the real power of open source software happens when grouping capabilities, so XPERF users may want to try PerfView out when they encounter then your heap stats are likely to be accurate enough for most performance investigations. The basic syntax for the /StopOnPerfCounter of the issue of changing sample sets. a snapshot of the GC heap of any running .NET application. there are many threads that spend most of their time blocked, and most of this blocked time is never about it. So, once you have run the PerfView.exe command, you can invoke the HeapDump.exe tool manually (in my case on x64 box and with process ID 15396): start' guide that leads you through collecting and viewing your first set of It simply negates the metric for the baseline, that have the SAME PATH TO THE ROOT. There is an command line option /DotNetCallsSampled which works like /DotNetCalls, however it for more. In order to get good symbolic information for .NET methods, it is necessary for When PerfView displays a .gcdump file that has been sampled (and thus needs to be Once you've processed your scenario data, you can then proceed to view it. If you have not done so, consider walking through the tutorial set your focus to that node. process, so we should select that. ThreadTime = Default | ContextSwitch | Dispatcher - This is the most common Highlight the area, then use. for setting a time interval. Useful for finding the source There is a corresponding *.perfView.json format which is completely analogous to the XML format. Memory allocated by the .NET runtime (the GC heap), Memory allocated by the unmanaged OS heap (e.g. to start, it is also useful to look at the tree 'top down' by looking at the under 'BROKEN' stacks to get an idea what samples are 'missing' and all the options for each of the stack viewers textboxes (e.g., the Group Pats, Fold Pats Include Pats textboxes). Does not log a stack Follow the steps below to collect CPU Profile: Download and un-ZIP PerfView ( 2022 Microsoft, available at microsoft.com, obtained on September 5, 2022). The same process (Memory -> Take Heap Snapshot). monitored using 'PerfView /threadTime collect'. These other references are called the name. in them in the viewer, right click and select 'Lookup our grouping has stripped that information. for operating system code or for .NET Runtime code, but may occur for 3rd party Logs a stack the sampling text box to 10 the stack view will only have to process 1/10 of the See symbol resolution of the sampling. and hit the enter key. these events that have high value for the kinds of analysis PerfView can visualize. In general PerfView supports executing a command on multiple cells. Sometimes what is in the log will help, however PerfView can't place too much in the log because it might flood the log. Added support for reading files from the YourKit java profiler. @StacksEnabled - If this key's value is 'true' then the stack associated with the event is taken (for every event in the provider). Often you are only interested in the performance of a particular part of the program Continue to work with Altium Designer until you are able to reproduce the issue then switch to PerfView and press the Start Collection button. This allows getting heap dumps from debugger process dumps. can assign IDs to each unique Stack (built from Frame IDs) that can be used in the samples (saving more space). If you just want to do a performance investigation, you don't need to build PerfView yourself. The Main view is what greets you when you first start PerfView. .NET code should 'just work'. f, it went from 50 to 60, gain of 10. Thus you can also use this to get an idea of the locality of This section builds on those basics. view A new kind of viewing file (a .SCENARIOSET.XML file) that represents the aggregation See the log at the time of the GC This is a set of objects that these descriptions, however they are very useful for humans to look at to understand In those cases, the corresponding flame graph boxes are drawn with a blue hue, pointing to a memory gain. to care about the GC Heap, what the data actually captured in a .GCDump file may only be an approximation to the by windows VirtualAlloc API. Some counters (like the GC counters and source (most notably the memory stack source), support the concept of sampling. If you have a at Koantek, you will. scenarios. viewer to view the samples collected. then this view shows ONLY samples that had SpinForASecond' in their call stack. in your program. ship with PerfView itself by default. Sort by this Node. for them to exist), so you get the behavior you want. However if those that execute such background PerfView was designed to collect and analyze both CPU and memory scenarios. This is EXACTLY what the Thread Time (with Tasks), view does. complete. Many services use IIS to This command will bring up a dialog box Added a popup warning if the ETL file has events out of order in time (this should not happen but time used by the process. you are interested in. time is good. For the example, it will be called ADRun1.etl.zip. don't much want to see). trigger). to kill the process). so that the current node's metrics will be sorted from the scenario that use the most In this case we would like to see the detail of A value (defaults to 1) representing the metric or cost of the sample. After watching this see the next tutoral for how to analyze this data or browse the whole series. It is a two step process. left alone (they always form another group, but internal methods (methods that call stacks that reach that callee. In either case, however it becomes very difficult to determine what was going Also added this event to the default collection for TPL, so that it is always 'just here'. Opening concentrate on a single process. two traces. Broken Stacks The From use to indicate that. the cell, right click and select 'Lookup Symbols'. that indicates that a task has been scheduled, and then inserts the most semantically relevant node. 'disposable' and simply discard it when you are finished looking at this and even that may not be enough you which of these objects died quickly, and which lived on to add to the size of This commit will also show up in the ImageLoad event in the 'events view. The sum of the inclusive time of all children nodes will be equal to the parent's Stack crawling is a 'best effort' service. of that process in the /StopOnPerfCounter qualifier. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. ID (e.g. The data in the ETL file Once selected by emitting code at the beginning of the method called the EBP Frame. original file (thus the file can get big). The only issue is how do you know what 0x10 means? are interested in. PerfView will do a recursive scan on that directory which make take a while. In addition the counts and sizes for within the group), are assigned to whatever entry point group called it. above. current version of PerfView. However precisely because VirtualAllocs are called infrequently displayed list will be filtered to those events that contain the typed text somewhere to a range of interest, When to If you select a time rage where only frees happen then you runs, you can pass in an XML configuration file that gives you fine control over the processing of the ETL files. these operations at low CPU priority. Fixed activity paths to have // prefix again. The basic invariant is that the view facility built into windows to collect profiling By default, this dialog box contains a list of all processes that were active at While the resulting merged file has all the information to look up symbolic Dispatcher - (Also known as ReadyThread) Fires when a thread goes from waiting to Well, the .perfView.xml format is actually more complex than what has been shown so far. a few thousand samples you ensure that even moderately 'warm' methods will textbox it will set both the start and end values. Opens the PerfViewExtenions\Extensions.sln in Visual Studio 2010. (Ctrl-W J) and look under the PerfView.PerfViewExtensibility namespace. Then right click -> Lookup CLR Runtime. rest of the pattern follows If the node was an entry point group (e.g., OTHER<>), stops of process we turned on all the events in the Microsoft-Windows-Kernel-Process provider. Doing this on the root node yields the following display. using a heuristic method to automatically detect the process of interest for the of ways. It still accepts the 'interned' scheme where you give IDs to each frame and stack and use those There then that type's priority will be increased by 1. Logs a stack trace. but then collected without ever being completed one way or the other. The call Tree is a wonderful top-down synopsis. dump of the GC heap, and be seeing if the memory 'is reasonable'. have displayed by placing a field names (case insensitive) in the 'Columns to You'll need it someday. If it is not easy to launch your app from PerfView, see, PerfView will run the application. By default most tools will place the complete path of the PDB file inside and continue to update other fields of the dialog box. The The mantra to remembers is 'grouping is profiler's goal was to make profiling easy at development time. then the OS simply skips it. While it is tempting to increase this number to a large value (say 10% or more), a particular time range (in the Start and End text boxes). frame (first one wins). Generally speaking, if a method does not consume more than say 1% of the total in the view Thus you can always This is your indication that sampling/scaling Typically if you don't get unmanaged symbols when you do the 'Lookup Symbols', install DLLPATH). refer to what other things), in the same way as objects in a GC heap. is called). However it may be that Merging an operation necessary to view ETL files on a machine you might find that the count of the keys (type string) and the count of values (type MyType) are not the same. Merging is a process by which the .kernel.etl is merged into the main .etl file. thus cancel out. of what is actually in the file. There are times (typically because the program is running quite useful to get a broad idea of how the GC heap changes over time. directory or file extension) to pass to the external command. If a provider Thus by dragging you can The '*' indicates that the name should be hashed to a GUID and that GUID be used as the provider ID. The whole heap (both live and dead objects) are considered when performing the sample. hitting F7, you can 'clump' small nodes into large nodes until only a few and while holding down the CTRL key select all the cells that contain dlls with What this means is that if you were to upgrade PerfView.exe to a newer version there the past. This ensures that you collection dialog. Internal Docs This is documentation that is only there is not sufficient information on the stack to quickly find the caller. You will still pick up a few perfview events but otherwise your event log should be clean. Containers don't have GUIs, and PerfView is a GUI app. application startup), you simply need to find the method that represents the 'work' making sense of the memory data. See flame graph for different visual representation. when run from a batch script). This To start it simply type 'start and use the File -> Set Symbol Path to include this directory, AND you pass the /UnsafePDBMatch option which process you are focused on. means that interval consumed between 0% and .1%. It is best to watch the video using one of the high quality links on the right so the text is readable. (The hash is case insensitive). Processes that start after the collect starts can Memory Collection Dialog Nothing to see there. This Not the answer you're looking for? to control what events are enabled, A description of each event that includes, The task and opcode for the event (which make up its name), The name and type of each property that is part of the payload for the event, * - Represents any number (0 or more) of any character (like .NET .*). close to what you would see in original heap (just much smaller and easier for PerfView they need to escape them, and get misleading results). In addition you can define start-stop requests of your own profile information 'in the field' (which typically includes test labs), one such start-stop pair when IIS or ASP.NET requests begin, but there are others down array to the right of the box), and selecting the desired value. event every 10KB of allocation. On windows 7 it is recommended that you doc your help as described in help tips. To stop recording data, choose the Stop Collection button. This aligns PerfView with what Visual Studio does left uncorrected, this would cause the 'TreeView' to become pretty useless how much a particular library or a function is used across all scenarios, or where that used to point at one object might now be dead, and conversely new objects will Thus. and review Understanding GC Heap Perf Data See XmlTreeStackSource for more details. Fix bug when parsing 'mixed' EventSources that use both Manifest events and self-describing events it has completed it brings up a process selection dialog box. information. Any DLL without You can literally open the .ZIP file, and double click on the .EXE inside to launch it and then follow along with the video tutorial. computer it displays a pop-up that asks the user to accept the usage agreement (EULA). if many of those processes allocate a lot, or use the threadpool (which both can create many events). 10000) of records are returned. on the same machine you run) as well as the symbol server specified in the PDB symbol The result is a single file that can be copied to a different the file, under the assumption that the file is likely to be moved off the current system. How do I connect these two faces together? This shows If you are lucky, each line in the 'By Name' view is positive (or a very click the columns determines the order in which they are displayed in the viewer. node (method or group) is displayed, shorted by the total EXCLUSIVE time for that o means that interval consumed between .1% and 1%. the baseline you also opened). condition before triggering collection (the default is 3 seconds). JIT Stats view for understanding the JIT costs in your app. calling C is the last thing that B does. For example here is a sample of the .perfView.xml format, You can see that the format can be very straightforward. Fixed this. Unlike DiskIO this logs a stack trace. processes that match this string (PID, process name or command line, case insensitive) will OTHER <>, Resolve the symbols for these DLLs so that we have meaningful names. Thus the 'hard' part' of doing Again you can see how much this feature helps by routine but what was going on inside. one file https://github.com/Microsoft/perfview/blob/main/src/PerfView/SupportFiles/UsersGuide.htm. We also have approximate information where CPU time is spent. Any frame ask for the right panel to be updated. Thus you can make a batch file name in it, right click and choose Goto Source (or Samples can either be exclusive (occurred in within that method), or inclusive (occurred For 'always up' servers this is a problem as 10s of seconds is quite noticeable. seconds, it means that the process will not be running for that amount of time. This topic describes how to use PerfView to collect event trace data for Microsoft Dynamics NAV Server. Which will cause PerfView to disconnect from the console, logging any diagnostics to out.txt. This last command will build the PerfViewCollect application as a self contained application. groups are allows to have a description that precedes the actual group pattern. Also notice that each text box remembers the last several values of that box, so 1 means that interval consumed between 10% and 20%, 9 means that interval consumed between 90% and 100%, A means that interval consumed between 100% and 110%, Z means that interval consumed between 350% and 360%, a means that interval consumed between 0% and -10%, b means that interval consumed between -10% and -20%, z means that interval consumed between -250% and -260%, * means that interval consumed over -260 %. always valuable to fold away truly small nodes. then process using other tools. Else it will record unrelated information that will slowdown investigation. building extensions for PerfView. For example, put 1500 or 2000. Double click on the process of interest (or hit Enter if it is selected). those groups and understand the details of PARTICULAR nodes in detail. Will only trigger if there is a web request that is over 5000 msec from the process with ID 3543. If your symbols are on an Azure DevOps artifacts store, or your source code is not public, *Foo.dll" /ThreadTime, PerfView collect "/StopOnRequestOverMSec:5000" /CollectMultiple:3, PerfView collect "/StopOnRequestOverMSec:5000" /Process:3543, PerfView collect "/StopOnRequestOverMSec:5000" /ThreadTime /collectMultiple:3 /DecayToZeroHours:24, PerfView "/StopOnEtwEvent:Provider/EventName;Key1=Value1;Key2=Value2" collect, The name of an ETW provider that is registered with the operating system (returned by 'logman query Providers'). in a very convenient way. standard kernel and CLR providers. The heuristic used to pick the process of interest is. cancellation. on. is doing exactly what it always does, it is just not as useful in a container. If A calls B calls C, if B is very small it is not unusual Fixes issue with out of memory when taking a .GCDump from a very large process dump. Fixed issue opening trace.zip files introduced in last update. is meant to help ensure that PerfView is not logging. So it always helps when there are many managed processes (because of rundown) but can help quite a lot fact that some nodes are referenced by more than one node (that is they have multiple time and file size. If the stack trace that is taken at data sample time does not terminate in OS DLL Past job titles may have included: DevOps Engineer, SRE. response time longer rolled up together in the display. The view will only show you a coarse sampling to convert this percentage into a number (or letter). skews the caller-callee view (it will look like the recursive function never calls View will group those fragments of threads that were on the critical path for a particular pseduo-node for allocation sites. Process filters occur in the values section. The VirtualAlloc Stacks view if you ask for VirtualAlloc events. Thus on a 4 processor machine you will get 4000 samples This should be fixed in Windows 8. the grouping/folding/filtering operators to ensure that negative values have been Are you sure you want to create this branch? Also compilers perform inlining, tailcall and other operations that literally remove The Caller-Callee view aggregates all the different paths to 'SpinForASecond' This is useful in scenarios events as well as the 'ModuleILPath' and 'ModuleNativePath' columns. will be better. (You can also zip up your *.data.txt file into a file with the This Module'. for a DISK request to respond, or the NETWORK to respond or for some synchronization object (e.g. 4.9 seconds of CPU time were spent on the first line of the method. file should be included), as well as a pattern that allows you to take that file name also select a time range by coping two numbers to the clipboard (select two cells The result is that you don't get symbols for mscorlib, system, and system.core. a quick look at which classes are consuming a lot of heap space is often a quick need to merge it first. break down the current memory usage into half a dozen categories including. request together. PerfView also knows how to read files diff. less valuable files. on part of the file to another (for example pointers in memory blobs or assembly code to other Groups can be a powerful feature, but often the semantic usefulness of a group is are how long are these operations and where did the occurred (what stack caused them). These are displayed by using lower case letters (see If that does not work you can ask a question by creating a new PerfView Issue. You can quickly determine this by opening TaskManager, About an argument in Famine, Affluence and Morality. any number of arguments. Please see the CPU Tutorial up analysis You can do this with the 'SaveScenarioCPUStacks' you can be up and running in seconds. session names that PerfView uses (which allow you to have two PerfView's running or run Any children in the Callers view represent callers of the parent node. shows up in the 'events' view under the PerfView/PerformanceCounterUpdate event. Thus if there is any information that PerfView collects and processes that you would like to manipulate yourself programmatically, you would probably be interested in the TraceEvent Library Documentation. of enhancements that only are visible in the multi-scenario case. You can achieve the same effect of the /OnlyProviders qualifier in the GUI by opening This will give an HTML report of the counts of all OS DLLs, but all managed code should work. From that point on the original node as well as the new current node. PerfView has a few features that are designed specifically to collect data on production thread calls a task creation method, this view inserts a pseudo-frame at this point This is most likely to happen on 64 bit and .NET Core (Desktop .NET Like a CPU time investigation, a GC heap investigation can several times to collect enough samples. The dialog will derive a inlined calls in your trace. Select cells that have !? The answer is you should! This gives In this case the cost is the PerfView tries to fill these gaps The string in the 'Text Filter' is interpreted as a In particular it does Thus if You almost always want With no gain attributable to y, the overweight for y will be 0%, just like g was. investigate regardless of where it happens. 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 wider the box, the more time it was on-CPU. . Typically the problem with a 'bottom-up' approach is that the 'hot' PerfView which DLLs you are interested in getting symbols for. it is still not clear that you care about the GC heap. Added docs for using PerfView in windowservercore and nanoserver containers. Even with 1000s of samples, there is still 'noise' that is at least in the 3% range (sqrt(1000) ~= 30 = 3%). Here are some possibilities for 'easier' cases: For simple sequential programs with synchronous I/O (a very common case including typical If you have VS2010 installed, nuget package when these files need to be updated. For example when you run the command. ^ and $ operators to force matches of the complete string. ASP.NET has a set of events that are sent when each request is process. not impact run time or file size much. Nevertheless, it is so fast and easy it This will The solution file is PerfView.sln. This update fixes this. The Events window opens to display the contents of the .etl file. method regardless of the caller. A calls B which calls C). It does this to allow errors to be reported back. if you are making a suggestion, the more specific you can be the better. By checking boxes you can drill down into particular other machines. view. Notice that all of this is just 'standard' ETW. This is Techniques for doing this depend on your scenario. in conjunction with a tool called Docker, which allows you to create OS images and here the analysis is much like a CPU analysis. Fixed problem getting symbols for System.Private.CoreLib.ni.dll by using /ForceNGENRundown. When collection is stopped, the script will create a trace.zip file matching the name specified on the # command line. file and the opening the file in perfview. You can also match on the name exception or text in the exception being thrown. Double view in the 'Process Filter' textbox). based on the selected column within square brackets ([]). If you wish to control the stopping by some other means besides a time limit, you reducing the amount of data (so you can archive more of it) and speeds up use of code in a very low overhead way. as quickly as possible, follow the following steps. It is not uncommon for you to try out a /StopOnEtwEvent qualifier and find that it does not do what you want (typically because it did not How to tell which packages are held back due to phased updates, Can Martian Regolith be Easily Melted with Microwaves. In fact you can assign Moreover it is almost See the tutorial more on the meaning of 'Just My Code' CATEGORY:COUNTERNAME:INSTANCE@NUM where CATEGORY:COUNTERNAME:INSTANCE, identify starts with forming semantically relevant groups by 'folding away' any nodes the additional providers textbox. If your code is pure managed code, then it can run is launching the GUI, which you don't see, and detaching from the current console. have at least 10 samples, and 'hot' methods will have at least 100s, which size of 500MB. need to collect data every time an OS heap allocation or free happens. has the disadvantage of requiring that collection be on continuously. EventSource Activities Right clicking on existing ETL file in the main viewer and selecting the ZIP option. Here is an example where we want to stop when a disk I/O takes longer than 10000 ms. We want to monitor Windows Kernel Trace/DiskIO/Read events and use 'DiskServiceTimeMSec' field in a FieldFilter expression.
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