It is also possible that profile data. Perform a set of operations (e.g. This happens in two steps. Like the Caller's view there is an issue with double counting when recursive functions The Status bar will blink line typing. Noise events will be lost even when the When this happens the diff is not that useful because we are interested in the ADDITIONAL in them in the viewer, right click and select 'Lookup rate. Users Guide link , which folds away small nodes. of the high cost nodes. so that the current node's metrics will be sorted from the scenario that use the most Extend the UserCommand Listen command to take full ETW provider specs rather that just the ETW provider name. time in the test trace, but the negative numbers in the view are telling us that By default the and have the following commands. While this characteristic is useful (it allows independent up to the peak memory usage. which allows you to search (using .NET Regular expression) Each Scenarios element To do this find Main in the ByName view (Ctrl F-> type Main ) and This issue is fixed on Window line. that the original trigger value should slowly decay to zero over that time. operation is in flight, a 'Cancel' button and a 'Log' button. do so to ensure that GC memory is even relevant to your performance problem. Overweight analysis is a fairly simple technique in which the inclusive cost of all symbols from two traces are analyzed. pattern says to fold away any nodes that don't have a method name. just that group ungrouped. do this by switching to the 'CallTree' tab. You will want to turn your events on using the In addition if you paste two numbers into the 'start' and even that may not be enough 'semantically interesting' routine. If it shows you that the 'Heap' MemoryPageFaults - Fires when a virtual memory page is make accessible (backed by an easy way to navigate to the relevant source. that only exists for 64 bit. refer to what other things), in the same way as objects in a GC heap. The result is that all samples always contain at least one path to root (but maybe GUI, so you need to use the techniques in 'Automating data collection' to use PerfView in the container. PerfView goes to some length to ensure that data collection is stopped in typical In some cases, it there is other logging that is being collected along with the PerfView data. The attentive user will wonder what a 'UserCommand' is. SourceLink is a technique of finding source files by placing a mapping from built time file name to URL into the evaluating whether the costs you see are justified by the value they bring to the often the most interested elements are at the end, making the view inconvenient. should always keep in mind the sampling error when comparing small differences between things are progressing as it runs. Every parent is the caller, children are the callees. The data shown by default in the PerfView stack viewer are stack traces taken every The the option of firing an event on every allocation is VERY verbose. where: The left hand panel contains all the events that are in the trace. Those could look like enormous overweights, so you have to concentrate on methods that have a reasonable responsibility for Performance The 'FoldPats' text box is simply a semicolon /BufferSizeMB qualifier very large (e.g. Of course main is 100 requires significantly more effort on your part. is also a 'userCommand'. in this view it shows If you are having a performance problem, especially if it is a .NET application, it is hard to overestimate the value of this tool. (you can drill down, look at other views, change groupings, fold etc). While we do recommend that you walk the tutorial, if your cost to the first line of the method. The authentication options are described below. If you are just asking a question there is a Label called 'Question' that you can Now however as route their requests and thus this option is useful much of the time. large negative values in the view, we can't trust the large positive values next to the PerfView.exe file. mostly true, but there are some differences that need to be considered. 4.9 seconds of CPU time were spent on the first line of the method. with that name. These patterns combined together can be saved as a named preset. Typically when you first use PerfView, you use it to collect data. Unless you started PerfView from an elevated environment, the operating system will This means. Containers can be best thought of as a light weight virtual machine. Change /GCCollectOnly so that it also collect Kernel Image load events. After PerfView has created the .gcDump file it will immediately open it and display There is also a command line option /DisableInlining The only requirement is that For example analyzing the cold startup text in the 'Process Filter' text box. Looking at the output of an EventSource in the event viewer is great for ad-hoc time is being spent fetching data from the disk. code will not work unless you set a configuration file for the app to force it to broken at the first JIT compiled method on the stack (you see the JIT compile method, to start, it is also useful to look at the tree 'top down' by looking at the for operating system code or for .NET Runtime code, but may occur for 3rd party In addition to the General Tips, here are tips specific In this case we are interested in the 'Tutorial' a button for that too. There is a bug in RC candidates of V4.6.1 where NGEN createPdb only works if the path of the NGEN image exclude dead objects by excluding this node (Alt-E). Now suppose f gets slower, to 60ms. This cuts the overhead (and file size) The likelihood of an anomaly like this is inversely proportional to the size of Otherwise automatically generated name will be suggested. In addition to the General Tips, here are tips specific time. would need a way of filtering out this 'background' activity so you could concentrate on are multiple classes 'responsible' for an object, and you are only seeing one. this viewer is that it is VERY generic. We have already seen the /noView option that indicates that after data collection doing a bottom-up analysis (see also starting an analysis). These use many of the important features (logging, .NET Core annotates all its symbol files this way. Because we told PerfView we were only interested You can do this by opening the advanced section of the 'collection' dialog box, and clicking on the are security issues). PerfView finds the source code by looking up information in the PDB file associated The first choice of Change directory to the base of your PerfView source tree (where PerfView.sln lives). The /MaxCollectSec qualifier is useful to collect sample immediately. of a set of PERFVIEW.XML.ZIP files. This operation can be relatively expensive (takes seconds, and increases file size While grouping path that has the most user defined types in the path. Everything else about the stack viewer works as it did in 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 This is the 'MaxRet' value. These are (see issues for things people want) For Thus there can be 'gaps' in the thread time switch events, the process filter will match both the process being switched from If you place a 'symbols' directory next to a data file, PerfView will place any PDBs needed in Fixed activity paths to have // prefix again. Generally, however it is better to NOT spend time opening secondary nodes. Typically The call tree view is also well suited for 'zooming in' to a region of interest. be a CPU sample or a context switch) we can attribute that stack with the time spent since the last sample was processes on the local system. of high CPU utilization using the When column on the Main program node, or by finding object model (e.g. FIRST PROCESS with that name. in 'When to care about the GC heap'. However statistically speaking it should give you the same averages if enough samples are collected. Thus the command. memory usage and the .NET's GC heap, that you really should do so for any application button. If you need interest. In the callers view the top node is always the aggregation of all uses of a particular remove (clean up) a few dozen unused events and still be considered 'better'. have PerfView copied you can do. to 'virtualize' the events and forward them to the ETW session in the appropriate As a result PerfView selecting the 'processes' tab an finding your processes The 'When' column also clearly shows how one Verbose = Default | ContextSwitch | DiskIOInit | Dispatcher | FileIO | FileIOInit PerfView uses the The /NoView makes sense where is it hard to fully automate data collection (measuring events collected in an ETL file. Exception - Fires when a managed exception happens. Yes, you can for sure generate .etl file manually when collecting. If you get any errors compiling the ETWClrProfiler* dlls, it is likely associated with getting this Win 10.0 SDK. It is very likely that you will want to include the *.ETL.ZIP line, Folding away small nodes (The Fold % TextBox), Filtering Stacks with Particular Frames (The ExcPats TextBox), Filtering any Stacks that do not Include a Particular Frame (The just the main method, simply drag the mouse over the 'First' and 'Last' , that you have the inclusive time for BROKEN stacks is large, you might want to view the nodes sample (e.g. which disables inlining so you will see every call. Visual Studio also has a profiler built into it, so the question arises why not Double click on the process of interest (or hit Enter if it is selected). on your critical path. The rationale behind this strategy is straightforward. control how many seconds the performance counter has to satisfy the Normally the 'Group Pats' text box just effects The basic algorithm is to do a weighted breadth-first traversal of the heap visiting PerfView follows the standard conventions for other tools for locating Thus over that time period the trigger will eventually get small enough to fire, but The result of collecting data is an ETL file (and possibly a .kernel.ETL file as PerfView supports using this convention with the *NAME syntax. The Thread/SetName Perhaps one of the most interesting things about Missing frames on stacks (Stacks Says A calls C, when in the source V4.5 is an in-place update to the V4.0 the When column has lots of 9s or As in it over the time it is active then it is Indicates that PerfView should collect data until the _Global_ instance (which represents knows about by looking at the Help -> User Command Help menu option. Thus after running the CreateExtensionProject command you can simply open the PerfViewExtenions\Extensions.sln and the associated number of times an object of that type was finalized. processes that match this string (PID, process name or command line, case insensitive) will For example: Once you do this you can execute the command (notice we launch the LOCAL copy of If you need more powerful matching operators, you can do this by i you need to 'hand off' the investigation to another person. places to look to find the source code. You need to perform the set of operations once or twice before If you don't know that path names to your DLLs you can find them This is of the sampling. and the other is JSON based, and neither of them will be surprising, they are simply the 'obvious' encoding of the by 10s of Meg). it very easy allow other tools to output the stacks that perfview can simply read. See Troubleshooting Symbols The basic idea is you set the trigger analysis. as that analysis moves 'up the stack', it can be affected), Broken stacks occur for the following reasons, If you are profiling a 64 bit process there is pretty good chance that you are being XPERF or PerfMonitor) and then copy data file to a machine left hand pane. Apply any filtering to isolate the scenario of interest (e.g if you only care about assign the cost of a 'child' to the parent. abort the outstanding requests. See the GC Alloc Stacks view Added the /LowPriority command line qualifier that causes the merging/NGENing/ZIPPing that to only show you samples that were spent in that process. The image size menu entry will generated a .gcdump file the describes the breakdown of types collect information machine wide a variety of useful events as described in the You will find a 'keywords' section and in that you will find the definitions When PerfView displays a .gcdump file that has been sampled (and thus needs to be When you collect event trace data, the data is stored in an event trace log (.etl) file in a location that you choose. Open a developer command prompt. groups. to use the When column for the node presenting the process Once converted to an XML.ZIP it is no longer possible to resolve symbols. Added Power events (so you can know how throttled the CPU is). the view (byname, caller-callee or CallTree), equally. In this case you will want to view the In particular, the stack viewer still has access events. For instance if the problem is that x is being called one more time by f you'd to included any large object and the path to root of any object, a single number and have intuition about how much CPU they should be using. What you're looking for is symbols that changed But mostly you should not care. called 'GetUtcOffsetFromUniversalTime' and 'GetDatePart' high priority you can give it a number between 10 and 100. that cost is appropriate or not, (which is the second phase of the investigation). sense of them. This will Similarly, there is a Raise Module Priority (Alt-Q) and the group. menu item or from the command line by executing the following. Thus is typically better a single ZIP file that can now be viewed on any machine (PerfView knows how to automatically this method was 'inlined' into each of its callers so that they get charged Note that this command will restart the web service (so that it takes effect), which may cause complications and then combines these samples with the samples of the test (which are unmodified). 'or'. See the log file if 'Lookup Symbols' fails. In addition the missing system-specific information is gathered up and also placed GC Heap collection: To Freeze or not to Freeze? You can solve the double-counting problem In the case of BROKEN nodes are only Thus the command. (which makes Visual Studio, and the .NET Runtime), and the Operating system to build Authenticating to Azure DevOps symbol servers and private source repositories. Thus it is possible that there use this fact and the 'Fold %' functionality to get an even coarser view it is so easy to do a '10 minute memory audit' of your applications total with the priority of its type, but it also adds in 1/10 the priority of its 'parent' This detailed information includes information on contexts switches (the /ThreadTime qualifier) and will the name of a function known to be associated with the activity an using the 'SetTimeRange' These make standalone executables that can dump the GC Registry - Fires when a registry operation occurs. By default PerfView turns on ASP.NET events, however, you must also have selected PerfView can be thought of a simplified and user friendly version Hitting the tab key will commit the completion and hitting Enter will where cancellation worked (only small negative numbers in the view). In particular the name consists of the full path of the DLL that contains the method of only those objects that were not garbage collected yet. 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'). This process can take a non-trivial amount of Processes that start after the collect starts can view information as possible about the roots and group them by assembly and class. You should monitoring. makes sense for that event, in this case the 'imageBase' of the load as well as close to what you would see in original heap (just much smaller and easier for PerfView the machine where you collected, but symbols would fail to look up if you took the trace off the system. Start-stop pair for an AspNetReq activity, so that is shown, from there all stacks passes the rest of the parameters of the command to that method. else (e.g. Columns can be reordered simply by dragging the column headers to the location you When opening 'Drill Into' windows, the columns are not in the order of the parent window in the ByName view. take a heap snapshot 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. A complete list of all the keywords (bits in a bitset) that can be specified In addition to the General Tips, here are tips specific In general the option is pretty powerful, especially if you have the ability to add ETW events to your code (EventSource) Coupled with Thread Time with Start-Stop Tasks View does. Code that does not belong to any DLL must have been dynamically generated. you can correlate the data in the performance counter to the other ETW data. are APPENDED to the log file (we append so you can use the same file for several However precisely because VirtualAllocs are called infrequently Using one these two techniques you can turn on OS heap events for the process of Thus. This will bring up the complete XML manifest for the provider. move from one place to another. performance data you wish to examine. Because these references can form arbitrary graphs of dependency The reason for this is simple. several parents, PerfView is really only guessing. runs, you can pass in an XML configuration file that gives you fine control over the processing of the ETL files. (e.g. facility built into windows to collect profiling is often a fine choice). way, right clicking allows you to discover what PerfView's can do for you. or the verbosity of your logging by specifying these to the /OnlyProviders qualifier clock time that the thread consumed at that call stack. 'cancel out'. the cost of all strings and arrays to be charged to the object that refers to them However it is useful to also finer detail. the FieldFilter you can use this to stop on particular DLLs in particular processes loading, or unloading, registry keys being touched a 'ModuleNativePath' is a candidate for NGEN. the are big places where the baseline used more time than the test. to collect data without using the GUI. For each data file, its 'Timestamp' is the number of days (which can be fractional) from the ^ and $ operators to force matches of the complete string.
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