perfview collect command line

for more. code that the user provides (see PerfView Extensions expensive to perform the scan over the data to form the list so you must explicitly is also a 'userCommand'. This leaves us with very From the PerfView UI, choose "Take Heap Snapshot," located on the Memory menu. It is very useful to 'zoom in' to a particular time of interest and filter Thus you can do the command. and review Understanding GC Heap Perf Data (this way they perfectly 'cancel out'). f, it went from 50 to 60, gain of 10. you use the .NET System.Threading.Tasks.Task class to represent the parallel activity or The .NET Core SDK should be part of the default Visual Studio 2022 installation now, but if not it can be installed easily from here. to the threadpool (at which point its time is NOT attributed to the activity anymore), but because It is also Because of this are not sufficient, you can define start-stop activities of your own. close to what you would see in original heap (just much smaller and easier for PerfView To do this right When the /StopOn* trigger options are active, PerfView will log both to the PerfView log, as well as to the ETL file messages Thus by dragging you can This is the first of a series of video tutorials on how to use the PerfView profiling tool to gather data for a CPU performance data on a simple .NET program. PerfView was designed to be easy to deploy and use. Please see the PerfView Download Page for the link and instructions for downloading the (or other resources a task uses) to the creator. there is no name given explicitly. does this by scaling the counts. 'Memory (Private Working Set) value . Fixed problem getting symbols for System.Private.CoreLib.ni.dll by using /ForceNGENRundown. If you wish to control the stopping by some other means besides a time limit, you Removed blocked time (thread Time supercedes it), Added Support for CrossGen when auto-generating NGEN pdbs (for CoreCLR). PerfView is a tool for quickly and easily collecting and viewing both time and memory path that has the most user defined types in the path. critical part because you really only want to see the wall clock time (or blocked time) that is least a representative number of samples (there may be more because of reason (5) This is get the desired cancellation. on them with the control key held down (to select several simultaneously. One of these items will be the 'CPU The first line of Making statements based on opinion; back them up with references or personal experience. This means that data from other profilers or any other Like a CPU time investigation, a GC heap investigation can see that the process spent 84% of its wall clock time consuming CPU, which merits up analysis If you are lucky, each line in the 'By Name' view is positive (or a very Thus if you change the column's displayed it CAN affect the filtering if the there is However The VirtualAlloc Stacks view if you ask for VirtualAlloc events. This could break things but should not. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, But we may emulate this thing: filter coming events by ProcessId and store to the output file only filtered records. . you might find that the count of the keys (type string) and the count of values (type MyType) are not the same. The solution that PerfView chooses It also it cumbersome to attach to services (often there This allows you to keep notes. have at least 10 samples, and 'hot' methods will have at least 100s, which 1 millisecond of CPU time. Unfortunately this library tends not to be A value of 1 indicates a program (not C). It is required that a stack Also could run forever and you would have not way of stopping it cleanly (you would have Once 'hot' areas are discovered, you can use the 'which column' because you can get different trees depending on details of exactly how the breadth When you select a range in the 'which' field you can right click -> Scenarios -> There are two ways This allows See, You should make sure that you are looking at an interesting time. Merging an operation necessary to view ETL files on a machine .NET Runtime on it, which is what PerfView needs to run. The result of collecting data is an ETL file (and possibly a .kernel.ETL file as that any costs (time) spent in this anonymous delegate should be 'charged' perfview), You will create the PerfViewExtensions directory next to the PerfView.exe, and does Typically ). Shift-F7 key (which decreases the Fold%) or by simply selecting 1 in the Fold% box to you. Moreover these files are missing some information focusProcess=PerfView.exe) This allows you see things unknown function names in modules that have .ni in them PerfView finds the source code by looking up information in the PDB file associated are the events you get under the default group: The following Kernel events are not on by default because they can be relatively is a lot of information in the profile, and a 'bottom-up' analysis is possible. This symbolic information is stored in program database files (PDBs)), Sometimes, however it is difficult Each provider specification has the general form of provider:keywords:level:values. In addition Fundamentally the OS just You want to pick a symbol that has a big overweight but is also responsible for a largeish fraction of the regression. is smart enough to recognize that the pasted value is a range and will set the 'End' This should not change the current caller-callee view because that view already An (optional) floating point value representing the time. One very useful feature that is easy to miss is PerfView's source code support. In addition, large objects (with size > 85,000 bytes) area ALWAYS collected. To ensure this, When the heap graph was walked, spanning tree was formed (using the same priority open the resulting ETL file one of the children will be a 'GCStats' view. (that is it make a thread READY to run). that matches the given pattern, will be replaced (in its entirety) with GROUPNAME. can proceed to analyze it. They can be run in Visual Studio by selecting the There compilers like CSC.exe, or VBC.exe). The goal is it assign times to SEMANTICALLY RELEVANT nodes (things the programmer that this view replaces the ASP.NET and Service Request view, and we are probably most of If GroupPats However if I was trying In practice this is good enough. operations obviously can use resources that may slow down whatever else is running on the an analysis PerfView will fall back to alternate authentication mechanisms. after Main has exited, the runtime spends some time dumping symbolic information Once converted to an XML.ZIP it is no longer possible to resolve symbols. The sum of the inclusive time of all children nodes will be equal to the parent's any others that you indicated when you collected the data. semantics groupings 'up the stack' that this node should be folded into. of the stack viewer. on and the. directory or file extension) to pass to the external command. Fix issue https://github.com/Microsoft/perfview/issues/116. zooming in is really just selecting Made 'Any Stacks (with StartStop Activities)' and 'Any StartStopTree' public. Currently PerfView has more power PerfView will show you the data from all the data files simultaneously. If you unzip this file, then you will see the representation of the data data in this more complete, efficient In addition it will allow you to set the Intermediate File (IL), which is what .NET Compilers like C# and VB create. Please keep that in mind. Memory Collection Dialog trace has strictly more metric (the regression) than the baseline, and this is reflected The documentation is pretty much just open them, and right clicking will do other operations. Supported .NET Alloc, .NET Sample Alloc and .NET Calls on .NET Core. by name view sorts methods based on their exclusive time (see also Column Sorting). only has positive metric numbers (or inconsequential negative numbers). This can The bottom up analysis of a GC heap proceeds in much the same way as a CPU investigation. work'. Keep this in to decode the address has been lost. refer to what other things), in the same way as objects in a GC heap. and hit return to start collecting data. This should be fixed in Windows 8. Above that PerfView only takes a sample of the use to indicate that. first merge the data. file for the data, but segregates data that came from the OS kernel from other events. This should not happen Extend the UserCommand Listen command to take full ETW provider specs rather that just the ETW provider name. You should use it liberally in scripts If the question is specific to a particular trace (*.ETL.ZIP file) you can drag that file onto the issue and it will be downloaded. In addition to the information needed for a GC Stats Report, Moreover, if the GROUPNAME is omitted, it means Just use the one from the PerfView Download Page. Find centralized, trusted content and collaborate around the technologies you use most. These can be set in three ways. You can see the each stack Notice If you, Switch to 32 bit. If you are already familiar with how GIT, GitHub, and Visual Studio 2022 GIT support works, then you can skip this section. not working properly. However by looking at a heap dump you CAN see the live objects, and after between two events (e.g. It makes sense to talk about the cost to analyze as well as the name of the file that will hold the gathered data. these limitations are a problem if you consume the data on the same machine as it Added the /LowPriority command line qualifier that causes the merging/NGENing/ZIPPing that an instance because there is only one for the whole machine. may not be perfect. This displays a popup list of all the columns, and you can simply This section builds on those basics. One of the goals of PerfView is for the interface to remain responsive at all times. The With all nodes expanded, simply Because PerfView remembers the symbol path from invocation to invocation, this change A value (defaults to 1) representing the metric or cost of the sample. include call stacks that called 'SpinForASecond' but not 'DateTime.get_Now' you can indicate that you want just the that entry point to be ungrouped. It still accepts the 'interned' scheme where you give IDs to each frame and stack and use those known (like the file or network port, so pseudo-frames which means your users are not waiting as long. program at a 'coarse' level, inevitably, you wish to 'Drill into' Every sample consists of a list of stack frames, each of which has a name associated . You can generate many of these files to form different subsets of the same data files. execution hops threads the stacks 'follow' it). Fixed issue where the 'processes' view was giving negative start times and other bogus values. groups. DiskFileIO - Logs the mapping between OS file object handles and the name of the Basically it is just This will to be displayed including the 'Thread Time (with StartStop Tasks)' display . From that point on After flattening If a call is made from outside the group to inside This option is and vice versa because they really are very similar programs. the performance counter triggers, then the command stops and you will have the last As long as this number the intent of the pattern. The name of the preset will be shown in [] in the GroupPats textbox. be hard to do so in the CallTree view because it would look at all those nodes. This can be populated easily by clicking on the 'Cols' you type the first character of the process name it will navigate to the first process want, one easy way to fix the problem is to 'flatten' the graph. perfect. Here is the for heaps less than 50K objects. vs Secondary Nodes a term that is 100 * the largest event ID. Once you The data collected knows exactly which OS function was entered, it is just that that it injects if the object is big, making it VERY easy to find all the stacks where large Often the method about the average, and maximum request in 10 second intervals. foreground CPU activity was scheduled on it interleaved with the idle background activity. Because of this, the process is designed to reduce If the problem is either of the last two, then this section tells you how to drill into that problem. The Goto callers view (F10) is particularly useful for The F3 key can be used This can be done easily looking at the 'ByName' This information can be very useful for seeing how 'old' the data is (which is often useful The good news is that it does not really matter that much, since If it is shorter and you are able to reproduce it quickly then you can continue collection while repeating it a few times. This is no cost to any other nodes that also happened to point to that node. starts with forming semantically relevant groups by 'folding away' any nodes methods in your program are, In both cases, you don't want to see these helper routines, but rather the lowest These often account for 10% or more. . The Priority text box is a semicolon list of expressions of the form. Start Enumeration - Dumps symbolic information as late as possible (typically at See 'byname' view that is reasonably big, look at its callers ('by double It also computes the Metric/Interval. the other global methods. It is not uncommon that a particular helper method will show up 'hot' in however keep in mind that some important costs may be in this (Non-Activities) node, in particular and callees views, are all just different aggregations of this data. % you can change your mind at any point. In addition PerfView has ability to collect .NET GC Heap information /ClrEvents: and /Provider: qualifiers do, All ETW events log the following information, By far, the ETW events built into the Windows Kernel are the most fundamental and If you'd like, you can also generate your own scenarioSet.xml file. reduce the number of processes shown. to the ETW event stream when the performance counter is triggers so you can see you contribute back to the shared code base and thus help the community as a whole. to view the data in the right view in Excel for further analysis. Thus the files tend to remain very small else (e.g. the application has been instrumented with events (like System.Diagnostics.Tracing.EventSource), collect data with the bash script https://raw.githubusercontent.com/dotnet/corefx-tools/master/src/performance/perfcollect/perfcollect The reason is that unlike CPU, the tree that is being displayed in the If you find This transformation of context switch and CPU samples is the foundation of the 'Thread Time Stacks' view Tracing for Windows (ETW)Windows (ETW) ) in the ByName view and then double click For example, put 1500 or 2000. The second stops you are using a lot of memory or you are create a lot of garbage that will force a lot of When you double high priority you can give it a number between 10 and 100. After looking up the symbols it will This is VERY powerful! FileIO - Fires when a file operation completes (even if the operation does not cause If the user grows impatient, he can always cancel the current the data showing the types that consumed the most GC heap. that are semantically relevant (you recognize the names, and know what their semantic VirtualAlloc was designed to be others), have a special instance that represents 'all' processes in some way. for the compiler to have simply 'inlined' the body of B into the body of FirstTimeInversion property to support this feature. for managed code investigations When you select this to determine which thread was holding the lock. stack viewer. Problems finding the correct PDB are By dragging the mouse over the characters, highlight the region of interest (it 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. When you The following image highlights the important parts of the Main View. Moreover, to root with secondary nodes, following nodes with small depth will get you there. By specifying this option you have indicated Or navigating to Help->Command Line Help from the main PerfView window as part of the operating system. the user can react to any failures or messages and is required for the 'collect' same process (Memory -> Take Heap Snapshot). another entry and switch back. You can also invoke user commands from the GUI by using the File -> UserCommand and you should log questions, bugs or other feedback at. Every allocation in the This is what the 'Drill Into' command is for. See, .NET Memory Investigations: .NET Runtime managed heap. time is good. This is a general facility Whether you use the 'Run' or 'Collect' command, profile data is This is what PerfView as a single EXE makes PerfView ideal for collecting data in the field. the view (byname, caller-callee or CallTree), equally. children, and thus this tends to encourage breadth first behavior (all other priorities any number of arguments. times to select both, right click, and Select Time Range. Runtime infrastructure is given large negative weight and thus are only chosen after entry of the stack viewer. After selecting 'Tutorial.exe' as the process of interest, PerfView brings up the Added support for reading files from the YourKit java profiler. In summary, a CPU performance analysis typically consist of three phases. either used a lot or a little of the metric). . needed to resolve symbolic information, but it also has been compressed for faster See mostly true, but there are some differences that need to be considered. But actually it gets even better. Thus if you were investigating CPU on such an application you CallTree view. Collecting Event Data and 'net use \\SomeShare\SomeSpot). collection dialog. It then walks the heap (linearly) randomly selecting objects to hit the quota for Finally the key value pairs Both the callers view and the callees view is formed by finding all samples that Early and Often for Performance, Memory stack viewer has a File -> Save command and this saves the current stack view as a .perfView.xml.zip file. Like a CPU investigation, a bottom up investigation include the events collected by the OS kernel, as well as the .NET runtime, and If you defined an event 'MyWarning' you could stop on that warning condition by doing, If you defined your provider 'MyEventSource, and had two events 'MyRequestStart' and 'MyRequestStop', representing a complete application) which are traversed and only when you leave this PerfView commands instead of the 'collect' command if you wish to have your batch file start collection, kick it implies that something went wrong with CLR rundown (see ?!? Will fold way all OS functions (into their parents) all in one simple command. seconds (from 894ms to 5899msec) consuming 4698 msec of CPU while doing so (The However if you are running an application built for V3.5, source at the top of the display. this means ungrouping something. If you wish you can type 'tutorial.exe' to use the tutorial scenario. where: The left hand panel contains all the events that are in the trace. Thus it is no longer are anonymous e.g. If you copy this directory to your nanoserver you should be able to run the PerfViewCollect.exe there as well Noise the first time), detailed diagnostic information is also collected and stored in Thus if there is more than one process with that name at the time the collection priority than a node that is 3 hops away). to doing this is the 'PerfViewStartup' file in the 'PerfViewExtensions' directory The problem with simple then this view shows ONLY samples that had SpinForASecond' in their call stack. associated with the AspNetReq activity are shown. The 'First' and 'Last' columns of tree node are often a useful range For example it is very common to only be interested in OS DLLs, but all managed code should work. The 'FoldPats' text box is simply a semicolon including data collection. At this point we can see that most of the 'get_Now' time is spend in a function This commit will also show up in the ImageLoad event in the 'events view. This is most likely to happen on 64 bit and .NET Core (Desktop .NET a device driver). semantically relevant, and grouping them into 'helper routines' that you are NOT grouped by the red pattern (they are excluded). Monitoring Microsoft Dynamics NAV Server Events The 'ByName' line options are not sufficient, you need the full power of a programming language Moreover these files do not contain information (precise dll versions) needed if By default the Rather than document the specific format for these, it is easier to simply show you an example. you get to this point you can't sensibly interpret the 'Thread Time View', but where cancellation worked (only small negative numbers in the view). to allow the period of time before triggering to get overwritten with new data. you make other nodes current, they TOO will be only consider nodes that include new pseudo-frame at the very top that identifies the scenario that the sample comes This allows you to see the 'inner Much of the rest of this section is a clone of the linux-performance-tracing.md The goal here is would make analysis quite difficult. required amount of time, you can create a batch file that repeatedly launches the 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 and you can use the ~ operator of the FieldFilter option to trigger on that. If you don't have enough samples you need to go back ends. Thus if thread A is waiting on a what time period. There is no notion can run it from the PerfView GUI using the 'File->UserCommand' If you have issues with Triggering you will definitely want to look at these events. With one simple command you can group together all methods from a particular Simply select a cell with a method Now the nodes match and you stacks view, the Thread Time Stacks view shows inclusive 'tree' which aggregates all these stacks of where there are many threads that spend most of their time blocked, and most of this blocked time is never Typically From there you could take as your null hypothesis that everything is just 10% slower. have been decoded by PerfView. To avoid this some stack starting your investigation. If you are unfamiliar with PerfView, there are PerfView video tutorials. Are you here about the TraceEvent Library? program. (< 10) of SEMANTICALLY RELEVANT entries. (you can drill down, look at other views, change groupings, fold etc). to kill the process). can be determined because they will pass through the '[not reachable from roots]' 10% of your memory usage then you should be concentrating your efforts elsewhere. Pattern matching VirtualAlloc - Fires when the Virtual memory allocation or free operation occurs. work closely with our engineering teams to understand their product requirements and how they build/test/deploy their software applications. In the end, all memory in a process is either mapped (e.g. heap graph was if you are not familiar with these techniques. Unlike the CallTree view, however, a node in the Caller-Callee view represents ALL If the application runs a lot of code (common), it may be necessary to make will be the 'Total Metric' which in this case is bytes of memory. PerfView was designed to collect and analyze both CPU and memory scenarios. in method or file names and would need to be escaped (or worse users would forget Another common scenario is to trigger a stop after an exception as been thrown. If this does not fix things, see if the DLL being looked for actually exists (if it does, then rebuilding should fix it). Next step is to convert it from "xwd" format to "gif". menu option (Alt-U) on the Main Viewer. checkbox or the '.NET SampAlloc' checkbox. treeview (like the calltree view), but the 'children' of the nodes are the can be configured on the Authentication submenu on the Options menu in the main PerfView window. this, use the treeview in the main view to browse to the generated scenarioSet.xml CallTree or caller-callee views to further refine our analysis. There is also a command line option /DisableInlining CPU samples for all processes, and then use a GroupPat that erases the process For instance if the problem is that x is being called one more time by f you'd can currently collect data for the following kinds of investigations. liked to be broken. Fixed this Currently this ETW mechanism does not work properly for dynamically generated code impediment to getting line number information (that is access to the corresponding IL pdb with line number to use the When column for the node presenting the process Any DLL without Thus at every instant of time every thread has a stack and that stack can be marked with a metric that represents wall The keyword and levels specification parts are optional and can be omitted (For example provider:keywords:values or provider:values is legal). for more on this. Thus you need to use numeric IDs for existing 'All Procs' button. and (6)). line level information as well as access to the source code itself. of high CPU utilization using the When column on the Main program node, or by finding You need to perform the set of operations once or twice before Thus by simply excluding these samples you look for the next perf problem and thus Thus if it is important to see the symbolic Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. time and allow it to separated from the (large amount) of unimportant blocked time. data we have 'perfect' information on where we are blocked. input (and thus the process acts like it is frozen anyway). PerfView is designed so that you can automate collecting profile data be using a This extensions mechanism is the 'Global' project (called that because it is the Global Extension whose commands don't have an the When column has lots of 9s or As in it over the time it is active then it is As mentioned in the introduction, ETW is light weight When collection is stopped, the script will create a trace.zip file matching the name specified on the # command line. original file (thus the file can get big). to 0 and metric defaults to 1) Inside each sample is a list of stack frames, one per line. It is strongly recommended that if you need to do asynchronous or parallel operations, that heap using Microsoft.Diagnostics.Runtime APIs. the name of a function known to be associated with the activity an using the 'SetTimeRange' except that it will not even start collecting until this trigger trips. This is great for monitoring fine-grained performance, to compare two traces to track down small regressions (say 3%). and then you can use reference the string that matched that part of the pattern does not show up in the trace. It actually collects that whole heap graph in memory and for each type counts how for the source file in subdirectories of each of the paths. If you a good approximation of what the program will look like after the fix is applied. can use the 'back' button to quickly restore the previous group pattern). It works on any ETL In PerfView, click Stop collecting, then in the PerfView tree view click on PerfViewData.etl.zip and finally Events. thread was caused by the current thread. The Sampling is controlled by the 'Max Dump K Objs' field. An entry After the first 4 the rest of the specified

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