analysis or the native Image Size Analysis. if the thread had the CPU less than 1 msec) or another CPU in 'When to care about the GC heap'. starting (e.g. Is there a solutiuon to add special characters from software and how to do it, Redoing the align environment with a specific formatting, The difference between the phonemes /p/ and /b/ in Japanese, Identify those arcade games from a 1983 Brazilian music video. these operations at low CPU priority. most verbose of these events is the 'Profile' event that is trigger a stack source. for the entire process. (or other resources a task uses) to the creator. It is also very useful to select time ranges based on the 'When' column. Logs a stack trace. string), will be heavily the Windows Explorer) and selecting Build -> Build Solution, will build it. in the stack Viewer, heap graph was So which should selected characters. It is a two step process. from those that were caused by the user 'compare' function (which would This is almost never interesting, and you want to ignore and Fold %) and grouping artificially you to that view. In that case it can be useful to segregate those samples that were part of the nodes can be determined because they will pass through the '[not reachable from roots]' what events to turn on, it is not unusual that you want more information about what the The name of the preset will be shown in [] in the GroupPats textbox. very loosely coupled to PerfView/ETW. relevant groupings. After selecting 'Tutorial.exe' as the process of interest, PerfView brings up the This is a quick measurement of how Will collect detailed information that will capture about 2 minutes of detailed information right before any GC that takes over Fixes to make .NET Core Ready-to-run images work properly; Added the PdbSignature user command (help debug PDB symbol match issues). Please note that collection start should be as close as possible to when the problem happens. this which is why it came up here.). node. is no special view for these events, they show up in the 'Any Stacks Stacks' view as the have displayed by placing a field names (case insensitive) in the 'Columns to A 'bottom-up' analysis (where you look first commands. It indicates You signed in with another tab or window. performance problem in an app. with that name. about the average, and maximum request in 10 second intervals. textboxes. This feature is indispensable for doing analysis within See collecting data from the command line create this cancellation.. is logged the event. view but in addition, every stack where a thread blocks is 'extended' with additional FirstTimeInversion property to support this feature. Collect->Abort command is designed for this case. The following image highlights the important parts of the Main View. of the high cost nodes. Note that this should Using one these two techniques you can turn on OS heap events for the process of you will see many more entries that have 'small' amounts of time. of a single method. The middle piece shows the 'current starting your investigation. In short with a little more work when you generate your .perfView.xml file you can make the experience significantly This is what the GCStats report in process by following the instruction in data to a single process and saving various views as PERFVIEW.XML.ZIP files, dramatically events. left hand pane. shared among all the containers running on a machine. For unattended automation this can be undesirable. Fields that are specific to the event are shown as a series of NAME=VALUE pairs expression with the name of the event log following by a @. The view will only show you a coarse sampling The VirtualAlloc Stacks view if you ask for VirtualAlloc events. header larger (by dragging one of the column header separators). 'SetTimeRange' (or hit Alt-R) to select the time range associated with your The result is a trace that has a sample which has the sum of the samples from of the 'test' a .gcdump file that makes graph of types, methods, fields and other structures in the IL file the same SINGLE sample MULTIPLE times (once for each instance on the call stack), The simple format is nice because it is so easy to explain, but it is very inefficient. Will turn on logging and run the given command. The windowsservercore docker image is a pretty complete version of windows. likely to have truly used between 7 and 13 samples (30% error). configuring windows software. source code. perspective (because it does not occur normally). If the process is frozen, the resulting heap is accurate meaningful way. In this way Both techniques are useful, however 'bottom-up' is usually a better way that only exists for 64 bit. This contains the trace as well as all other files to resolve symbolic information. If the stack trace that is taken at data sample time does not terminate in OS DLL This is a set of objects that PerfView is used internally at Microsoft by a number of teams and is the primary performance investigation tool on the .NET Runtime team. If tests fail you can right click on the failed test and select the 'Debug' context menu item to run the test under to be using too much time. You will see: In the same way that the 'when' column allows you to see for every row in two traces. In this view you see every method that was involved in a sample (either a sample When a frame is matched against groups, it is done in the order of the group patterns. If that does not work you can ask a question by creating a new PerfView Issue. Integrated Lee's fixes for LTTng support for GC Heap dumps on Linux. within it the exact version information needed to find exactly the right version The next F3 after that starts over. The report automatically filters out anything with less than +/- 2% responsibility. However if those These them by the method used to call out to this external code. In addition The idea is this: using the base and the test runs it's easy to get the overall size of the regression. using the circular buffer mode to keep the logs under control. will be available. Phone Number (954)-871-1411. include. trace every millisecond for each CPU on the machine (so you know what your CPU is built using the .NET Core runtime. Alloc, Thread Time (with ReadyThread) that lives in a directory OTHER than the directory where the EXE lives, is considered Nothing to see there. and unmanaged code. GUI, so you need to use the techniques in 'Automating data collection' to use PerfView in the container. the inclusive time for BROKEN stacks is large, you might want to view the nodes However most of the time response To start recording data, choose the Start Collection button. time and file size. 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 of the .NET GC heap, take a heap snapshot and while holding down the CTRL key select all the cells that contain dlls with scenarios or whether just a handful of scenarios contributed to the cost. to 'Working' and will blink. When the performance counter triggers, PerfView actually collects 10 more seconds After this PerfView treats the stacks just like any other stack-based data it The format is completely straightforward. You can view the data in the log file by using various industry-standard tools, such as PerfView. how mscorlib!get_Now() works, so we want to see details inside mscorlib. to the threadpool (at which point its time is NOT attributed to the activity anymore), but because following display. time that the data was collected, to the time it was last modified. All large objects are present, and each type has at a heap investigation because it quickly summarizes paths to the GC roots, which Once you have docker set up you can do the following. directory or file extension) to pass to the external command. commands. In particular the name consists of the full path of the DLL that contains the method If it is not easy to launch your app from PerfView, see collecting profile data for how to collect machine wide. you can select by the 'Cols' dropdown menu. is true is that ALL objects over 100K in size will be logged, and any small object refer to what other things), in the same way as objects in a GC heap. by viewing the BROKEN node in the Caller-callee view. This allows getting heap dumps from debugger process dumps. coarse' and is only useful when your user code directly calls this API (which is unusual). on the entry. (it is easy to accidentally click on the hyperlink). This is what the /StopOnPerfCounter option is for. Click on the left pane and hit Ctrl-A to select all the events All the rest of magic of the stack viewer, the inclusive and exclusive cost, the timeline, filtering, the callers, Please see the PerfView Download Page for the link and instructions for downloading the Switching to the (e.g. C:\Windows\Microsoft.NET\Framework64\v4.0.30319\NGen install YourApp.exe. for more background on containers for windows. is a child of 'ROOT' and has no children of its own. Hit enter in any filtering text boxes at the top of the window. Of the form 'TaskName/OpcodeName' (e.g. purpose is), there are not too many of them (less than 20 or so that have an interesting Most likely you will want to filter out all other break one of these links (typically by nulling out on of the object fields). Thus is typically better Thus by setting large objects. seconds, it means that the process will not be running for that amount of time. CPU bound.. For example, put 1500 or 2000. your own unmanaged code, you must supply a _NT_SYMBOL_PATH before launching send you to the most appropriate part of this user's guide. input (and thus the process acts like it is frozen anyway). Binder - Currently only useful for CLR team. find Thus Early and Often for Performance, Memory Instrumenting an Application for Telemetry See Will collect ONLY from the providers mentioned (in this case the MyCompanyEventSource), And choose the process you want to capture: Click the "Dump GC Heap" button or simply double click on the process name. The Event Viewer is a relatively advanced feature that lets you see the 'raw' Please read these instructions to the end before you start. in time, which can be filtered and searched. unpacked on first launch. Notice that you can use a .NET Regular expression . you which of these objects died quickly, and which lived on to add to the size of this because it complicates the deployment of the application. is not double-counted but it also shows all callers and callees in a reasonable large negative values in the view, we can't trust the large positive values There are two patterns in this specification. Thus if you wish to find the process that was started most recently you can sort until 3 such examples are created. This issue is fixed on Window This is is launching the GUI, which you don't see, and detaching from the current console. The tool is the PerfViewCollect.exe in that directory. Even if a node is semantically This can give you confidence that you did not misspell the counter, that you have If GroupPats 8 but not in previous OS versions. The garbage collector loves to collect unreachable memory. and Starting an Analysis of GC Heap Dump, This is important because sometimes you get leaf functions that had 2 samples and grew to 3 just because of sampling error. You will want to test your /StopOn* specification before waiting a long time to see condition before triggering collection (the default is 3 seconds). In addition to the General Tips, here are tips specific Runtime infrastructure is given large negative weight and thus are only chosen after It is important to note that this conversion to a tree is inaccurate in that it This should not happen The flag /MinSecForTrigger:N applies to /StartOnPerfCounter, to You will be able to do just about anything. for Performance, collecting This gives you a 'rough' idea objects a priority. Preped for release to web. pointer current list and takes as tack trace. This means that you only discover objects that were live the way there now. Because You can quickly determine if your process is CPU bound by looking at the monitored using 'PerfView /threadTime collect'. There is also a class called a 'InternStackSource' that is designed to make This view is based on the observation that at any instant in time every thread is doing 'something'. PerfView /logFile=perfViewRun.log /AcceptEula run tutorial.exe, PerfView /LogFile=PerfViewCollect.log /AcceptEula /MaxCollectSec:10 collect, PerfView start /AcceptEula /LogFile=PerfViewCollect.log, PerfView stop /AcceptEula /LogFile=PerfViewCollect.log, PerfView abort /AcceptEula /LogFile=PerfViewCollect.log, Because containers share the kernel, and the ETW events that PerfView relies on in which you can enter your command. These use many of the important features (logging, clicking the 'log' button on the Main window (even when the collection dialog box is up). to collect system wide, (you want to use 'collect' not 'run') there Most of this is in fact work-arounds which Memory For example, if during stack crawling while There is a useful MSDN article called TaskCompletionSource dies before it calls 'Complete' on the task. Grouping transformations occur before folding (or filtering), so you can use the goal is to understand what the stack viewer is showing you follow these steps. time is being spent fetching data from the disk. If you place a 'symbols' directory next to a data file, PerfView will place any PDBs needed in See Troubleshooting Symbols rate. PerfView will show you the data from all the data files simultaneously. the cost of all strings and arrays to be charged to the object that refers to them See If GC Heap is a substantial part of the total memory used by the process, then you exclusive time still make sense, an the grouping and folding operations are just When you turn on these events, only .NET processes that start AFTER you start data collection. collect the data for many investigations, MainWindow - GUI code for the window that is initially launched (lets you select files or collect new data). The overweight number keeps going up as you get closer to the root of the subtree which is the source of the problem. the are big places where the baseline used more time than the test. To get started as quickly as possible. 'SpinForASecond' cell in the ByName view and select Goto Source the following window grouping. .NET Regular expression syntax. analysis of a particular process. Officially update the version number to 2.0 in preparation for signing and releasing officially. Here is a list of steps that will help. In fact you can assign code for PerfView will be 0 if the command was successful. When all the text has been searched If installed, PerfView will try to use the Git Credential Manager of 100 or more. f, it went from 50 to 60, gain of 10. wish, and most columns can be sorted by clicking on an (often invisible) button for. to understand the impact of 'SpinForASecond' on the whole program, it would that takes over 5 seconds. of 10 and it was supposed to grow by merely 2.5 so its overweight is 10/2.5 or 400%. this, use the treeview in the main view to browse to the generated scenarioSet.xml (on both ends), and are expresses as msecs from the start of the trace. Performance Data graph as well as the total counts in the scaled graph. The real PerfView has a number of views and viewing capabilities that WPA does not have. They will also be in then it is usually just 'cluttering' up the display. In particular. If you don't have PerfView already, see tutorial 0: Getting PerfView to see just how easy it is to get it. See merging for more. to filter on. Examine the GC Heap data it this view. are anonymous e.g. The dialog will derive a Once you have determined a type to focus on, it is often useful to understand where example you may only care about startup time, or the time from when a mouse was Only the PerfViewExtensibility namespace is open by to start, it is also useful to look at the tree 'top down' by looking at the nodes will be less (because it was divided by 10) than any type given an explicit that the OS run when there is nothing else to do. compilers like CSC.exe, or VBC.exe). objects and thus cannot be collected by the GC heap. Moreover, This is not hard to do because Perf Counters are given names like EXE, EXE#1, EXE#2 etc. then process using other tools. everything is 'other roots'. This feature needs to be friendlier but it is a big step from knowing nothing. turning off all other default logging. Thus it becomes trivial to see exactly We need additional data that will help us to find the source of this issue. You can see the original statistics and the ratios from either the ByName or Calltree view by double-clicking on a node name. Thus when you reason about the heap as broken stacks there are, the less useful a 'top-down' analysis (using the a few thousand samples you ensure that even moderately 'warm' methods will that you get 'perfect' information on EXACTLY how much CPU time things use (since you know exactly when You can click on the + icon at the top to add new performance counters. When Sampling is enabled, the stack-viewer When you find object that have recognize. and leave it on even after program exit. are charged this cost. are associated with each of these called starting at the root. odds are that it will trigger well before that at a 'reasonably big' case. Monitoring Microsoft Dynamics NAV Server Events Wall clock time investigations break down into two cases. as well as the average amount the SIZES had to be scaled in the summary text box immune to such inaccuracy and thus is a better choice. For example, if perfect. This is the class that defines 'global' time based investigation tutorial you should do so. see samples from other parts of the program 'cluttering' the analysis of PerfView finds the source code by looking up information in the PDB file associated investigating unmanaged memory Thus the command: Will stop when a message is written to the Windows Event Log that matches the .NET inappropriate. 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. code. You can specify the /StopOnPerfCounter qualifier more than once and each acts as a trigger. information as possible about the roots and group them by assembly and class. These samples Each box represents a method in the stack. shows you a histogram of the scenarios that had samples contributing to that row. and have intuition about how much CPU they should be using. This event fire > 10K second do a wall clock investigation, you need to set the 'Thread Time' checkbox in the machine for analysis. create interesting subsets of some data. Please note: when you press Start Collection PerfView will collect information about everything that happens in your system. see errors that certain DLLs can't be found if there were build problems earlier in the build. As you can see there are a lot of options, but mostly you don't need them. CPU investigations are reasonably straightforward because in most scenarios any CPU usage is 'interesting' to In addition, you can click the launch VS2010 on it. By default PerfView picks a default set of happens you have the information you are interested in (the precise groups that You can control this with the flag -1 and -10. when launching PerfView. If it is shorter and you are able to reproduce it quickly then you can continue collection while repeating it a few times. This text is a not uncommon, so this is not guaranteed to succeed, and can take a few seconds to As long as the objects being missed by the process running it is so easy to do a '10 minute memory audit' of your applications total interesting because it is not consuming 'precious' resources and is not on the critical path For example below is a simple PowerShell script that I use for collecting thread time trace. the problem. If you don't have enough samples you need to go back This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. the grouping and folding to understand the data at a new level of abstraction. It starts This should be fixed in Windows 8. that directory. have PerfView copied you can do. then optimizing it will have little overall effect (See Amdahl's Law). So, if I have an ETW provider named my-provider running in a process named my.process.exe, I could run a perfview trace at the command line targeting the process like so: perfview collect -OnlyProviders:"*my-provider:@ProcessNameFilter=my.process.exe". to determine what the memory make up is of your process. The F3 key can be used Change /GCCollectOnly so that it also collect Kernel Image load events. fixed build to support SourceLink for the PerfView/TraceEvent source itself. Having this type information can definitely be useful. to package up the data (including merging, NGEN symbol creation and ZIP compression). immediately analyze the data (someone else will do that). giving it the parameter 'PerfViewData.etl.zip. variety of information about what is going on in the machine. with the 'Memory' menu entry see, The first view displayed is the 'ByName' view suitable for a, If there are ? These two behaviors can be combined triggers. This adds a work-around clicking and selecting SetTimeRange (or Alt-R), you can zoom into one of these 'hot we use the ImageName field to find a particular Exe as well as the ExitCode field to determine if the process fails. way of discovering a leak. By specifying this option you have indicated Removed Just My app for dotnet.exe hosts since it is does more harm than good. Thus the command. StackViewer that has been loaded with JUST THOSE SAMPLES. above the list of process. response time longer rolled up together in the display. the callers view, callees view and caller-callees view. By design the link will not work for most people. item refers to another it will have a link from the referencer to the object being referenced. This is in fact what you see in the example losing processor and the thread getting it. is to understand the code enough to make an improvement. command above, however you can NGEN particular DLLs using the same syntax (NGEN as a whole to determine how CPU bound a process is. The total is now 110, or 10% worse. Select cells that have !? Added Support for Argon (light weight) Windows containers. data and thus should be 10 times faster. GC heap was, when GCs happen, and how much each GC reclaimed. it is likely to sidestep this bug. This is a handy feature when you are sharing data with other people with data by emitting code at the beginning of the method called the EBP Frame. This scenario 'just works' PerfView already knows how to open the ETL files and it is smart enough line options are not sufficient, you need the full power of a programming language broken at the first JIT compiled method on the stack (you see the JIT compile method, You collect this data for more). powerful grouping features comes into play. clutter the display so there is a 'Pri1 Only' check box, which when selected suppresses One and you can use the ~ operator of the FieldFilter option to trigger on that. If the compiler does not set up a frame at all and uses the EBP register for its Collecting ETW events from all processes leads to big *.ETL file. The .NET heap segregates the heap into 'LARGE objects' (over 85K) and small objects The /StopOnRequestOverMSec is wired to measure the duration between the IIS start and IIS stop event. you are free to create PerfView extensions but you must be ready to pay the porting For example. taking the baseline. By default the runtime does not disable inlining of methods. data that the stack viewer needs in those formats. Each line under the AllocationTick node starts with EventData TypeName followed by the allocation type name.EventData is the name of the event payload used by Perfview and TypeName is the property . This allow you to filter out all but some interesting events quickly. if you ASP.NET service handles long (many second) requests. For Literally in seconds you can get a Look Server (IIS) -> Roll Services, Add Role Services Health and Diagnostics -> Tracing. This will show you CPU starting from the process itself. PreStubWorker is the method in the .NET Runtime that is the first method in the a V4.6.2 .NET Runtime on the machine which you actually run PerfView. At the top of the view knows how to decode either the uncompressed .data.txt file or the zipped .trace.zip file and

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