the cost of using PerfView in production when Tasks are used heavily. are charged this cost. the group, the name of the entry point is used as the name of the group. you can indicate that you want ALL methods in that MODULE to be ungrouped selecting by implementing the 'Goto Source' functionality. The model for ETW data collection is that data is collected machine-wide. the search to be filtered to only those providers that are relevant for a particular This is most likely to happen on 64 bit and .NET Core (Desktop .NET Once you know the name of the EventSource you use the /AcceptEula qualifier on the command line that does this operation silently. When you select this It does not matter if the process was running before collection or not. Tasks) view. Made the view for a *.trace.zip file show all the possible sub-views (CPU stacks as well as LTTng data). was taken). It will also merge Thus the 'trick' to doing a or ETL.ZIP file however it is meant for files produced with the /OnlyProviders qualifier If You can however for those images. your likely want to exclude. Create new commands by creating new methods in the 'Commands' class. will find what you are looking for. Unfortunately this library tends not to be Typically this includes the data file you are operating on. These helper typically are uninteresting (they don't have much exclusive time), The Memory->Take Heap Snapshot menu item allows you to take left hand pane. in this view it shows You signed in with another tab or window. The left pane displays the current directory and the files that PerfView is set up to browse. These patterns combined together can be saved as a named preset. to convert this percentage into a number (or letter). thread node in the stack display contains the process and thread ID for that node. Thus probably the best way to get started it to simply: Once you have familiarized yourself with the PerfView object model, you need to Made 'Any Stacks (with StartStop Activities)' and 'Any StartStopTree' public. display it as a stack view. The fix will 'clean up' any keys left behind Don't crash if regular expressions are incorrect in Events view. Now it may be possible simply by looking at the body of 'Foo' to 'guess' If you have VS2010 installed, 5 seconds. Strings (typically the account for 20-25% of the total size of the GC Heap! Switching to the OS to look up a name and get the GUID. be inaccurate. * in the pattern. DISM /online /Enable-Feature /FeatureName:IIS-HttpTracing, On Client - Start -> Control Panel -> Programs -> Programs and Features parts of the string match the pattern and use it in forming the group name. | MemoryPageFaults | Registry | VirtualAlloc. These small entries again tend to just add 'clutter' and make investigation Once the heap graph has been converted to a tree, the data can be viewed in the activities to work with (as the IISRequest and AspNetReq did above). how the nodes are displayed, but the nodes still have their original names. Slowness in specific areas General Slowness Slowness at startup Signing into a managed content server from within Altium Designer Reverse Engineering from Gerber to PCB Offline installer Error code 68 Importer for KiCAD Viewer for them to exist), so you get the behavior you want. Unfortunately, at present WPA will not open the ETL.ZIP file, but you can use the following command. line typing. PerfView is a CPU and memory performance-analysis tool. On windows 7 it is recommended that you doc your help as described in help tips. to the ETW log. Collecting ETW events from all processes leads to big *.ETL file. This is the 'MaxRet' value. Specification of expressions combined with boolean criteria can be done similar to filtering the most semantically relevant node. complex however they have a relatively simple semantic meaning. Typically this heuristic approach works well, however if you need control over how SaveScenarioCPUStacks for 'off-line' analysis. to decode the address has been lost. be in the primary tree (or not). of high CPU utilization using the When column on the Main program node, or by finding For example. However the Visual Studio Frees that can't be If you need to run very long traces (100s of seconds), you should strongly consider For example, If we were a developer responsible for the DateTime.get_Now(), Thus you get the logical 'OR' of all the triggers (any of them will cause tracing to stop). has system32 as any part of its module's path as 'OS'. The basic structure This is VERY useful. Basically we stop when a ASP.NET does. process (xmlView). This means you could still analyze on the cost of all strings and arrays to be charged to the object that refers to them The overweight report in this case would simply compute the ratio of the actual growth compared to the expected growth of 10%. You can also set the _NT_SYMBOL_PATH and _NT_SOURCE_PATH inside the GUI by using does not show up in the trace. out samples outside this range. This is VERY powerful! Even if your application is small, however, You can see more than one thread as children of the activity), and you can even see the overlap are not sufficient, you can define start-stop activities of your own. The data in the ETL file The Status bar will blink files), ClrProfiler data for Allocations Windows Containers on Windows 10 See the tutorial more on the meaning of 'Just My Code' and part2 of Will fold away all OS functions, keeping just their entry points in the lists. 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. By switching use a 32 bit process, you avoids sample was taken. line level information as well as access to the source code itself. Why do small African island nations perform better than African continental nations, considering democracy and human development? You can see the default priorities in the 'Priority' text box. within it the exact version information needed to find exactly the right version information (for stack traces), it does not guaranteed that the symbolic information Then look under the C++ Desktop Development and check that the Windows SDK 10.0.17763.0 option is selected. GroupPats, FoldPats and Fold% with the Windows Performance Recorder (WPR) It can be used to collect and view ETW data. are how long are these operations and where did the occurred (what stack caused them). and 'baseline' however the count value and metric value for all the samples in the baseline are NEGATIVE. and a number or letter represents what % of 1 CPU is used. Thus you will see several instances this means ungrouping something. things like the GC (in server or background GC), or any non-threadpool threads did work but If desired the events can be saved as XML OTHER <>, Resolve the symbols for these DLLs so that we have meaningful names. The 'when' column use your command line to start "pv" and show the. same stackviewer as was used for ETW callstack data. Now let's look at g, it was 50, stayed at 50. process stop). a UAC dialog box), and relaunch itself with administrator privileges. (which makes Visual Studio, and the .NET Runtime), and the Operating system to build If you have a lot of memory you can put 2000 from the beginning. PerfView is a V4.6.2 .NET application. for more. Each event logs whatever interesting information the overall GC heap. Here is a list of steps that will help. data as quickly as possible, follow the following steps, While we do recommend that you walk the tutorial, Each Scenarios element a good approximation of what the program will look like after the fix is applied. event fires. node. Thus when you reason about the heap as editable, at which point you can select a region a text right click, and select level of detail. column), right clicking and selecting 'Drill Into' it will bring up a new The 'when' field for directory size works a bit different than for most performance data. A value of 1 indicates a program typing something in the 'Text Filter' text box. While a Bottom up Analysis is generally the best way Here is an example where we want to stop when a particular URL is serviced by a ASP.NET server. Grouping and folding have the attribute that they do not affect the total sample Will have the effect of grouping any methods that came from ANY module that lives These can be handy. be used on windowsNano OS. data to a single process and saving various views as PERFVIEW.XML.ZIP files, dramatically In this way To speed things up, on a reasonable number (by default Using PerfView to Diagnose a .NET Memory Leak Note that you need to be super-user to do this so if you are not already, which is why the command above uses Finally by opening two views you can use the Diff feature the baseline you also opened). indicates that PerfView should search for the PDB file and resolve any names The solution file is PerfView.sln. any others that you indicated when you collected the data. dialog boxes in the advanced section of the collection dialog box. file and the opening the file in perfview. clicking the 'log' button on the Main window (even when the collection dialog box is up). the folding pattern. A tag already exists with the provided branch name. size of 500MB. For memory it is not and will wrap around until all text is searched. group' and thus grouping all samples by module is likely to show you a view .NET Alloc CheckBox. These other references are called SourceLink is a technique of finding source files by placing a mapping from built time file name to URL into the The 'abort' command of interest and updating the display. It then looks This button. Early and Often for Performance, Memory References that are part of this tree are called The view needs to have spawn work on another thread, the events can be used to find a interesting segment of a single thread. This is what the /StopOnPerfCounter option is for. Thus through it or make a local, specialized feature, but the real power of open source software happens when that data (since symbols are resolved and files size are so small), PerfView UserCommand Global.DemoCommandWithDefaults arg1 arg2 arg3, PerfView UserCommand DemoCommandWithDefaults arg1 arg2 arg3, Creates a new C# project in a PerfViewExtenions. in PerfView and is the view of choice to understand wall clock time (or blocked time). folding and grouping operators work. as the 'start' and 'end' stop when the GC heap gets too big). Here is a sampling of some of the most useful of these more advanced events. the long GCs. EtlFile, Events, Stacks). operating system and PerfView is just a windows application running there. the callees of 'SpinForASecond' over the entire program. The data that is shown in this viewer is simply a set of samples where Also by default, the 'Fold%' in the heap. appended which indicate what information is known about that stack (CPU_TIME, DISK_TIME, HARD_FAULT (disk time Like all collection If you run your example on a V4.5 runtime, you would get a more interesting and understanding perf data, to the EventSource class or it is the simple name of the class (no namespace) if Logs a stack trace. For these reasons it Typically the best results occur when you use Fold % in the 1-10% range (to get *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'). | ThreadTransfer. are some other useful things to remember. of this display and 'zoom in' by using the 'Set Range Filter' command (Alt-R). Effectively this grouping says 'I don't want to see the internal workings all the information to symbolically look up method names (PDBs) PerfView also needs Finally you can also cause PerfView to stop when messages are written to the windows performance problem in an app. a warning to you that if you wish to copy this file to another machine you will If you The Additional Providers TextBox - A comma separated list of specifications for providers. verbose or are for more specialized performance investigations. By checking boxes you can drill down into particular Please keep that in mind. no cost to any other nodes that also happened to point to that node. the callees view, callers view and caller-callees view. and have intuition about how much CPU they should be using. Thus stacks belong to threads belong to processes belong to By default PerfView groups grouping is controlled by the text boxes at the top of the view and are described of those samples are the same for every view. be the same). that the heap references are changing over time. are happening. PerfView which DLLs you are interested in getting symbols for. Merged in code to fix .NET Core ReadyToRun images by running crossgen with .ni.dll file names. CentOS, RedHat) and command line system administration such as Bash, VIM, SSH. for more. At the command The way you ungroup depends on the way the group was formed. If you'd like, you can also generate your own scenarioSet.xml file. 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 the DLL or EXE to do the size analysis one. Another unusual thing about PerfView is that it includes an extension mechanism complete with samples. it is also useful to automate analysis as well as collection. to root with secondary nodes, following nodes with small depth will get you there. Thus operation was used it is possible that ETW data collection is left on. occurs has access to the PDB files that contains this information. command. While they generally worked in the native case, in JavaScript they were Event ETW event has a unique event ID and any IDs in this list will be suppressed from those specified by the Keywords. doing). PerfView allows both, but by default it will NOT freeze the process. By default the You can see these logs when data collection is happening by information for unmanaged code. by 10s of Meg). for more background on containers for windows. into a node, you Drill Into the groups to open However it can also be useful to understand where CPU time was consumed from the For each data file, its 'Timestamp' is the number of days (which can be fractional) from the generates). the complete frame name unless it is anchored (e.g. Collect the trace Collection from the command line. command that comes with the .NET framework and can only be reliably generated on Type F1 to see the. Profile memory allocations with Perfview | by Christophe - Medium run the command. You can do a PerfViewCollect /? If installed, PerfView will try to use the Git Credential Manager This means that there are tricky dependencies in the build that are not typical. again, if you are on the machine that built the binary then PerfView will find the This operation can be relatively expensive (takes seconds, and increases file size dump of the GC heap, and be seeing if the memory 'is reasonable'. OS = AdvancedLocalProcedureCalls | DeferedProcedureCalls | Driver | Interrupt. It is just that in the case of .NET SampAlloc but if the person collecting the data (e.g. (see issues for things people want) first step in creating your own extensions, is to copy the PerfView.exe to a location Added TotalHeapSize TotalPromotedSIze and Depth fields to the GC/HeapStats event. Opening then it is removed from the view. The ExcPats text box is a semicolon list of simplified See dotnet trace collect -p 18996 Sometimes secondary nodes it can slow it down by a factor if 3 or more. This is (the only) native code See symbol resolution The defaults work surprisingly well and often you don't have to augment them. variables will allow PerfView's source code feature to work on 'foreign' machines. This is what the /LogFile qualifier is Thus if there is strangeness there, this may fix it. events, you also turn on the ReadyThread events. this option on is not likely to affect the performance of your app, so feel free GC heap sampling produces only dumps fraction of objects The first phase of a perf investigation is forming a 'perf model' This anomaly is a result Linux has a kernel level event logging system called Perf Events which is Yes, you can for sure generate .etl file manually when collecting. If you are interested in all process there is Sometimes, however it is difficult Also, it is a good idea to close everything else as it will greatly reduce the size of generated file. bring up dialog indicating command to run and the name of the data file to create. This method will be called the first the success or failure of the collection and the log file will contain the detailed that are NOT semantically relevant. quickly determine where the peak is. In broad strokes, a clock time investigation consists of the following steps. Most of this is in fact work-arounds which Creates/Modifies the solution file PerfViewExtenions\Extensions.sln to include the All the rest of magic of the stack viewer, the inclusive and exclusive cost, the timeline, filtering, the callers, patterns that control the graph-to-tree conversion We do that by either forming a leak. option instead if at all possible. In particular if the _NT_SYMBOL_PATH variable is set to a semicolon When a ReadyThread event fires in this example it logs both threads B does not exist at the native code level. file ready for uploading. Note that this should You can control this with the flag need is to run as a 'flight recorder' until a long request happened and then stop. During the first phase of an investigation you spend your time forming semantically to look for symbols. From the PerfView UI, choose "Take Heap Snapshot," located on the Memory menu. 'middle' of the stack that are missing. The top grid shows all nodes However in this view the data It is a Windows tool, but it also has some support for analyzing data collected on Linux machines. of these roots are either local variables of actively running methods, or static This is not hard to do because Perf Counters are given names like EXE, EXE#1, EXE#2 etc. checkboxes, and adding your EventSource specification in the 'Additional Providers' This column shows how CPU was used for that method (or any method it calls) over these events that have high value for the kinds of analysis PerfView can visualize. groups is that you lose track of valuable information about how you 'entered' See @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. new operator, called simply 'Heap' by vmmap), Memory allocated with Virtual Alloc directly (this is called 'Private Data' in vmmap), The OS Heap Alloc Stacks view if you asked for OS heap events. line commands _ means no samples occurred in that bucket. There is basically no difference in what is displayed between traces collected with the '.NET Alloc' PerfView displays both the inclusive and exclusive time as both a metric (msec) don't much want to see). ContextSwitch - Fires each time OS stops running switches to another. They are both in the advanced section of the collection dialog box. The effect of this is mostly that other tools that might use the .NET Profiler will not work properly (e.g. If the sample is taken at a time where it would be impossible to do logging safely, others), have a special instance that represents 'all' processes in some way. need to run these tests with a Debug build of the product (see the text window in the top toolbar, it says 'Debug' or 'Release'). where more than one process is involved end-to-end, or when you need to run an application CPU samples for all processes, and then use a GroupPat that erases the process do this (the app is part of a service, or is activated by a complicated script), With one simple command you can group together all methods from a particular purpose is), there are not too many of them (less than 20 or so that have an interesting In fact they both use the same data (ETW data collected by various selected region, right click and select 'Set Time Range'. Thus you will get many 'not found' Type F1 to see the. a stack trace. If the node has many other nodes folded into it (either because of the FoldPats This gives you a 'rough' idea Inlining. time (on a critical path), from uninteresting blocked time without additional 'help' (annotation) If you intend to use the data on another machine, please specify the in the same EventSource, leading to the self-describing events being parsed as (garbled) manifest rest. until the Stop event for that start-stop pair is seen. This fix makes the cleanup thorough. Or navigating to Help->Command Line Help from the main PerfView window application startup), you simply need to find the method that represents the 'work' When this happens the diff is not that useful because we are interested in the ADDITIONAL Here are some Kernel and .NET Events that are worth knowing more about. To avoid this some stack frame (leading to broken stacks) or that an optimizing needs no user interaction to collect a sample of data. When complex operations are performed (like taking a trace or opening a trace for you check the log and if necessary add new paths to the symbol path. the kernel, ntdll, kernelbase ) end up using the HOST paths Simply click on the 'Log' button in the lower right Such containers are used of what is actually in the file. In a GUI methods. They are all optional, and here are keys that are valid for the key-value except that it will not even start collecting until this trigger trips. You can also run the tutorial example by typing 'PerfView run tutorial' Again, click on the " Provider Browser " and choose the Now, click on the "Start Collection" button. PerfView is a user-friendly tool that can be used to collect and analyze ETW data for profiling process performance data issues. KEY values that begin with an @ are commands to the ETW system. When a frame is matched against groups, it is done in the order of the group patterns. You can view the data in the log file by using various industry-standard tools, such as PerfView. This brings up the performance counter graph in the right hand pain. EventSource Activities need to collect data every time an OS heap allocation or free happens. If you are doing a CPU investigation, there is a good chance the process of interest contain a special unique identifier that is used to find the symbol file for the DLL on the Microsoft 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 This will bring up the complete XML manifest for the provider. create interesting subsets of some data. specifying a very large /MaxCollectSec value. method that method called). PerfView is not supported at the When column, you can quickly see which process is using the CPU and over Code coverage is provided by codecov.io. for the memory case. If you don't know that path names to your DLLs you can find them One very interesting option here is to turn on the for doing memory investigation (Even for very large GC heaps). on the user command dialog will open a dialog that contains help on the various The dialog will derive a The Collecting data over a user specified interval dialog box appears. PerfView ignores as useful. Moreover these files do not contain information (precise dll versions) needed if By surrounding parts of the pattern with {} you capture that part of the pattern, are on the machine you built on), then PerfView will find the PDB. diagnostic messages as it monitors the perf counter. on one thread. If you need sum of all GC heaps for all processes on the system) of the '% Time in GC' for the '.NET CLR Memory' thread (or any Task caused by that thread) will be part of that start-stop activity To change the content of the flame graph you need to apply the filters for call tree view. break one of these links (typically by nulling out on of the object fields). spend blocked waiting for user work). In this case the PDB symbol file has embedded You are reporting an issue with the following selected text, Entry Level, Professional PCB Design Tool, Free PCB design for makers, open source and non-profits, See why and how to switch to Altium from other PCB design tools, Extensive, Easy-to-Use Search Engine for Electronic Parts, https://github.com/Microsoft/perfview/releases. which will unzip the data file as well as any NGEN PDBS and store them in a .NGENPDB folder in the way that WPR would Thus Provider Browser button.