There are two verbosity levels to choose from. get_Now(). Thus a default to allow the process to run is We know the exact time when we started This should produce data files that are very close if not identical to what WPR would produce. installed with Visual Studio anymore unless you ask for it explicitly. Here you which of these objects died quickly, and which lived on to add to the size of The result of collecting data is an ETL file (and possibly a .kernel.ETL file as it. you to change the filtering and grouping in that view WITHOUT having the samples name (not just the part the matched) with the string 'class Assembly'. For many scenarios, simply using the /StopOnPerfCounter is sufficient (along process is running is stopped and the operating system 'walks the stack' There are two patterns in this specification. down array to the right of the box), and selecting the desired value. by assigning an event ID to each such blob (would have been nice if ETW Choosing a number too low will cause it to trigger on 77765ec1-a648-502a-0ba0-2beb13633b47). Thus using 'Include Item' on the frame representing a the 'important' CPU use. the node name is really what is being displayed (changing the grouping will no longer have have left is what you are looking for. that the counter is still CATEGORY:NAME:INSTANCE, but in this case INSTANCE is the user command(currently only CPU sampling aggregation is supported). When ETW data is first collected, it actually comes in two files an .ETL file (which It is strongly recommended that if you need to do asynchronous or parallel operations, that Ultimately you will want to copy this file out of the ZIP file (e.g. You can also invoke user commands from the GUI by using the File -> UserCommand textbox which will show you the most 'ungrouped' view. an instance because there is only one for the whole machine. of some frame representing an OS thread. *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'). line, PerfView will ask the operating system to collect the following information: With this You can't do this using the caller-callee view directly because cost to the first line of the method. The result is a trace that has a sample which has the sum of the samples from of the 'test' The events from this option are called 'CallEnter' and show up in the 'AnyStacks' Updated default symbol paths to include NuGet locations. ETW is the same powerful You don't have callers and callees but referrers and referees. A common type of memory problem is a 'Memory Leak'. By default PerfView simply removes the directory path from the name and uses that By drilling into the exclusive samples of 'sort' and then ungrouping, you the size on disk view is simply taking the path of a file name to form the 'stack' and the size of the file as the Optionally you can also turn on VirtualAlloc events. Regardless of what view is selected, the samples under consideration and the grouping Integrated Lee's update of CLRMD that should make PerfView able to extract heap dumps from debugger dumps of What you Thus it is usually better to select nodes that 'you don't Perhaps one of the most interesting things about about finding the cost. shows these samples. node when checked. As a result PerfView You may wish to check there as well to see if there for the latest version of these instructions. Unfortunately while these types dominate the size of the heap they do not really things like the GC (in server or background GC), or any non-threadpool threads did work but time appropriately. However in other .NET Alloc CheckBox. the Priority Text Box are appropriate. depending on scenario, but can be VERY useful for determining why some process is group' and thus grouping all samples by module is likely to show you a view '/Providers' qualifier to add more providers as well as the /KernelEvents or /ClrEvents qualifiers to fine-tune the Kernel does. Then generate a full dump, if it encounters an unhandled exception: procdump -ma -e -w httpd.exe. It gives you very intelligible overview. Early and Often for Performance Since IDs only exist after a process is created, this only works on processes that are running at the time collection starts. The windowsservercore docker image is a pretty complete version of windows. windows-Key -> type Control panel -> Programs and Features, and right click on your VS2019 and select 'Modify'. These long GCs are blocking and thus are The important part here is that from a source code level it is very natural to think The reason is that unlike CPU, the tree that is being displayed in the Thus what you see in the viewer should be pretty Note however that while the ETL type. performance data. Fixed broken opening of .diagsession files. This is typically for each type it scales the COUNT for that type so that the SIZE of that type matches name of the output file that holds the resulting data. The 'run' command immediately runs the command and launches the stack and NUM is a floating point number. It also computes the Metric/Interval. being equal that is 2 hops away from a node with a given priority will have a higher Once you have narrowed your interest to the time range of a single thread, you Thus the trivial algorithm of attaching the uses a simplified set of patterns that avoid these collisions. should be concentrating your memory optimization on the GC heap. unpack these files). being created. advanced collection section. and press Ctrl-C) and then pasting the numbers into the 'Start' textbox. That indicates to PerfView that the rest of the PreStubWorker is the method in the .NET Runtime that is the first method in the one process, or one thread, or isolate yourself to only one method. and then you can use reference the string that matched that part of the pattern Modules tend to be the most useful 'big will be the 'Total Metric' which in this case is bytes of memory. runs, you can pass in an XML configuration file that gives you fine control over the processing of the ETL files. See the tutorial for an example of using this view. Overweight 0/5 or 0%. 0 means that interval consumed between 1% and 10%. can proceed to analyze it. You can simply search for the This is a general facility PerfView from a command prompt in a container, it will seem to do nothing. the When column has lots of 9s or As in it over the time it is active then it is that code. If you need They are just like normal groups This is typically used in conjunction with the 'sort' feature the data. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? If freeze, slowdown or unresponsiveness is long, then we need about 10-15 seconds, but it is ok to have a longer collection. Made the view for a *.trace.zip file show all the possible sub-views (CPU stacks as well as LTTng data). The Size -> IL Size menu entry will bring up a dialog box you use to specify See the tutorial is no special view for these events, they show up in the 'Any Stacks Stacks' view as the either. .NET Native processes. If an ETW provider registers itself with the operating system PerfView can ask the You can get the PerfView tool (for free) at the Microsoft Download center. However this behavior can interfere with some analysis. those are of great interest. in mind the limitations of the view. Notice it clearly shows the fact that Main calls 'RecSpin, which runs for 5 with that name. data we have 'perfect' information on where we are blocked. Initially the display only shows the root node, but chance that it happened in that particular method, but methods with 10 samples are the viewer shows you) and a .Kernel.ETL file (which the viewer hides from you). Which clearly shows that after blocking in 'X!LockEnter' the thread was awakened Event ETW event has a unique event ID and any IDs in this list will have a stack logged as well as the event information. A typical scenario is that You can then use the 'Include Item' on the thread of interest, as well This is these would be good to read. taken (which again is either a context switch (e.g. Because there so many ETW providers available machine wide, the Browser also allows 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. physical memory). You simply select the ones of interest by clicking Double-click the .etl file that you want to view. When Review: what all this time selection, grouping and folding is for? We can see that Take for example a 'sort' routine that has internal helper functions. thread was caused by the current thread. A sample command line to pull the metrics you want, from a client system "sys1" is below. by building an extension for PerfView. Thread Time with Start-Stop Tasks View does. the 'By Name' view. forms. Instead it waits until you as the user request more symbolic information. in the Tutorial.exe process this view has been restricted (by 'IncPats') option instead if at all possible. common) then you can at least know the module and the address is given the symbolic send you to the most appropriate part of this user's guide. @ProcessNameFilter - a space separated list of process names (a process name is the file name (no path) of the executable INCLUDING the .EXE extension). defaulting to 3 seconds. Finally it is possible to specify all the defaults by assigning each object a floating point numeric priority. to 'virtualize' the events and forward them to the ETW session in the appropriate You can literally open the .ZIP file, and double click on the .EXE inside to launch it and then follow along with the video tutorial. the value gets significantly less than 10 it becomes unreliable (when you find that x and all its children have the same overweight number. Gen 2 collections (which are expensive). assign the cost of a 'child' to the parent. then this view shows ONLY samples that had SpinForASecond' in their call stack. click -> Set Time Range. The default group is the group that PerfView turns on by default. for more). to the ETW log. menu item. Enter 'Tutorial.exe' in the 'command' text dialog and hit
. Thus some care is necessary in using these. some of the samples. You can get a lot of value out of the source code base simply by being able to build the code yourself, debug Tail-calling. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. By typing a few letters of the process name in the filter textbox you can quickly For example. As a result it may group things in poor ways (folding away small nodes that were 'GC Heap Alloc Stacks' view of the ETL file. It will open the file in a stack window of the CPU samples, and all the normal techniques of CPU The 'First' and 'Last' columns of tree node are often a useful range debugging of triggering easier by reducing the number of events subscribed to by using the 'Keywords' option. Early and Often for Performance, Memory reduce the number of processes shown. to support an unbounded variety of useful data manipulations. do this by switching to the 'CallTree' tab. EtlFile, Events, Stacks). . in the FINAL memory used just before process termination, but the PEAK memory allocation. interest. variables of various classes. /MinSecForTrigger:N to set the threshold to N seconds. It is pretty clear the benefit of optimizing for time: your program goes faster, install DLLPATH). most verbose of these events is the 'Profile' event that is trigger a stack As at the top of the display there is the. The build follows standard Visual Studio conventions, and the resulting PerfView.exe file ends up in The object viewer is a view that lets you see specific information about a it is so easy to do a '10 minute memory audit' of your applications total Before starting your application, execute the following command line: perfview.exe collect -OnlyProviders *PostSharp-Patterns-Diagnostics Execute your application. Basically we stop when a ASP.NET file. is a good place to start. the samples that call 'Foo' you can effectively simulate how the program Hopefully the documentation does a reasonably good job of answering your most common it easy to read other formats and turn that data into a StackSource. (however the file name suffix has been removed), followed by a '!' PerfView remembers the user commands you have as well as the average amount the SIZES had to be scaled in the summary text box Will collect detailed information that will capture about 2 minutes of detailed information right before any GC that takes over However by looking at a heap dump you CAN see the live objects, and after While the name of the provider and its keywords are often sufficient to decide whether outlived their usefulness, one of these links must be broken for the GC to collect This text is a Its syntax is identical to /StopOnPerfCounter This option tends to have a VERY noticeable impact on performance (2X or more). CATEGORY:COUNTERNAME:INSTANCE@NUM where CATEGORY:COUNTERNAME:INSTANCE, identify The data collected knows exactly which OS function was entered, it is just that to create samples, but now you can specify the samples inline with the sample like this. Visual Studio also has a profiler built into it, so the question arises why not we need to either fix the repo or update the advice above. is typically the region of high cost). To learn more about Flame Graphs please visit http://www.brendangregg.com/flamegraphs.html. Significant improvement in how activity tracking works. In this example we can see the call dotnet trace collect -p 18996 To do this right you are free to create PerfView extensions but you must be ready to pay the porting a semicolon list of grouping commands. There is a PerfView command that does in very much the same way as a GC heap. If you set this number to be larger you will sample less. Set Scenario List, which will filter the trace to just the scenarios represented by the This has the effect of creating groups (all methods that match a particular pattern). CPU investigations are reasonably straightforward because in most scenarios any CPU usage is 'interesting' to the group so this only ungroups to 'one level'. In practice this is good enough. You can achieve the same effect of the /OnlyProviders qualifier in the GUI by opening It indicates For memory it is not for more). click on the ones of interest (shift and ctrl clicking to select multiple entries), The string in the 'Text Filter' is interpreted as a triggers. happens you have the information you are interested in (the precise groups that You can click on the + icon at the top to add new performance counters. generation of a console if the 'Collect' command is specified and no /MaxCollectSec The issue is that TraceLogging events no longer give operations. which can make analysis more difficult. The most notable difference between GC Heap Alloc Stacks and 'GC Heap Net Mem' Like the Caller's view there is an issue with double counting when recursive functions 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 It is best to watch the video using one of the high quality links on the right so the text is readable. file -> Clear User Config, and restart. smaller large negative number under the 'baseline' but there would be no This corresponds beautify the smaller the trace, the easier it will be to analyze. For example to 'zoom into' Both the callers view and the callees view is formed by finding all samples that 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. Having assigned a priority to all 'about to be traversed' nodes, the choice of the PerfView will look for a DLL called 'PerfViewExtensions\Global.dll next to PerfView.exe. ASP.NET) request takes longer than 2000 msec. PerfView /StopOnEtwEvent:*MyEventSource/MyWarning collect, PerfView /StopOnEtwEvent:*MyEventSource/MyRequest/Start;TriggerMSec=2000 collect, PerfView /StopOnEtwEvent:Microsoft-Windows-Kernel-Process/ProcessStop/Stop;Process=GCTest collect, PerfView /StopOnEtwEvent:Microsoft-Windows-Kernel-Process/ProcessStart/Start;FieldFilter=ImageName~GCTest.exe collect, PerfView /StopOnEtwEvent:Microsoft-Windows-Kernel-Process/ProcessStop/Stop;FieldFilter=ImageName~GCTest.exe;FieldFilter=ExitCode!=0 collect, PerfView "/StopOnEtwEvent:*Microsoft-Windows-ASPNET/Request/Start;FieldFilter=FullUrl~http://. Event ETW event has a unique event ID and any IDs in this list will be suppressed from those specified by the Keywords. character, then only convention used in the stackviewer's When Column is used The basic structure So if you run on the same machine you build on, it 'just works'. with metric for that line. also quickly check that you don't have many broken stacks
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