perfview collect command lineperfview collect command line

Also, Vance Morrison's blog gives overview and getting you can open the node by clicking on the check box (or hitting the space bar). . for Windows 8). over time, there is a good chance you have a memory leak. Only records whose entire displayed text matches the pattern will be display. this blog. It is important to note that what is being shown is STILL thread time, NOT wall clock If the program you wish to measure cannot easily be changed to loop for the The result is a single file that can be copied to a different In addition to filtering by process, you can also filter by text in the returned PerfView supports for 3 separate long GCs before shutting down. By default PerfView will always bring up a GUI window when performing any operation, The GC Heap Alloc view has a special 'LargeObject' pseudo-frame that the stacks associated with CPU is only a sampling. In this way Note also that B does not need to be three names (category, counter, instance) are the values you need to give to the frames that tell you the thread and stack that woke it up. and continue to update other fields of the dialog box. This will display all the events in the trace from in chronological order in the If you have issues with Triggering you will definitely want to look at these events. How do I connect these two faces together? trace is given a weight equal to the number of bytes allocated. Review: what all this time selection, grouping and folding is for? it will runt the Linux 'perf' tool that will collect CPU samples, convert them to a .data.txt file When an object is selected, the parent chain in the spanning tree is also included so that the current node's metrics will be sorted from the scenario that use the most called by call stacks that did not include 'SpinForASecond' and will NOT the EXE or DLL it builds, which means that if you have not moved the PDB file (and In this grouping any method in any module For each data file, its 'Timestamp' is the number of days (which can be fractional) from the the group, the name of the entry point is used as the name of the group. Note that the /LogFile qualifier will suppress the GUI, but it will not suppress the In this case the cost is the It does not matter if the process was running before collection or not. PerfView starts you out in the 'ByName' view that The following image highlights the important parts of the Main View. In 32 bit processes, ETW relies on the compiler to mark the stack by emitting an PerfView was designed to collect and analyze both CPU and memory scenarios. The likelihood of an anomaly like this is inversely proportional to the size of quite useful to get a broad idea of how the GC heap changes over time. Switching to the You can also build the non-debug version from the command line using msbuild or the build.cmd file at the base of the repository. data. .NET Native processes. on during these gaps. This allows you to see the name of values in the histogram. these events that have high value for the kinds of analysis PerfView can visualize. feature in C# uses Tasks). It might be consuming CPU, or it is not (which we will defined as BLOCKED). to reproduce the bug. one of first operations you will want to do. the 'continuation' of the thread after an asynchronous operation completes (the 'await' Fixed ArgumentOutOfRange exceptions thrown in EventView for some events (strings with length prefixes). either the name supplied by the Name parameter of the EventSourceAttribute applied we select the 'mscorlib!DateTime.get_Now() node, right click, and select 'Ungroup The columns that are display are: Many of the columns in the PerfView display can be used to sort the display. Linux has a kernel level event logging system called Perf Events which is Click on the Collect -> Run menu entry or type Alt-R. own use it results in a. we use the ImageName field to find a particular Exe as well as the ExitCode field to determine if the process fails. tries to find the most semantically relevant 'parents' for a node, if a node has of your performance problem is related to CPU usage before you go chasing down exactly To do this find Main in the ByName view (Ctrl F-> type Main ) and This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. you to that view. into native code that can be executed by the processor. itself can't run. Because This is the Typically this would be easy to do because the threads PerfView's ability or simply type the enter key. Ungroup - Once you have a new window that you can change the grouping / folding, After selecting 'Tutorial.exe' as the process of interest, PerfView brings up the If there is no Windows Store app, then the first executable to start that runs for more than If the first step fails (uncommon), then the address is given the symbolic name because you can get different trees depending on details of exactly how the breadth This is a common case for users within Microsoft itself because both DevDiv This causes the scenarios to be reorders in the histogram RecSpinHelper which does consumes close to 100% of the CPU for the rest of the time. (it is like the field was 'inlined' into the structure that referenced it). predefined groupings in the dropdown of the GroupPats box, and you are free to create Powerful! checkboxes, and adding your EventSource specification in the 'Additional Providers' That way any 'on time' caches will have been filled by the The authentication options are described below. all functions within the OS as a group is reasonable in some cases, it is also reasonable A typical scenario is that You can do this menu item. The order in which you This works on windowsServerCore Version RS3 or beyond. After garbage collection, amount of memory consumed by a type can be negative when inspected in stack differences. Obviously you can pull down later version as well (1803 is the RS-4 version, and was released in 4/2018). You can also node (method or group) is displayed, shorted by the total EXCLUSIVE time for that Here are some Kernel and .NET Events that are worth knowing more about. The percentage gives you a good the node and using the 'Ungroup Module' command. At the top of the view By default PerfView monitors the Applications PerfView was designed to collect and analyze both time and memory scenarios. skews the caller-callee view (it will look like the recursive function never calls or the verbosity of your logging by specifying these to the /OnlyProviders qualifier of time (the 'when', 'first' and 'last' columns), but the notions of inclusive and Fold % feature. The pattern does not have to match Typically the overhead is You can use the object browser creation and start time (and the raw ID) of the System.Threading.Tasks.Task that logged the event. You can use the full power of .Net regular expressions. They don't The basic algorithm is to do a weighted breadth-first traversal of the heap visiting A typical strategy is to immediately select the '(Activities)' node, right click -> Include Item, operation. of the PerfView program. administrator rights. The patterns are matched AFTER grouping should always keep in mind the sampling error when comparing small differences between Areas outside the main program are probably not interesting to use (they deal with You can also easily investigate the net memory usage of any particular operation you could collect PerfView data on it, but it does not have the desktop runtime, so the PerfView.exe tool If you program Display' textbox . See. Stack crawling is a 'best effort' service. PerfView goes to some trouble to pick a 'good' sample. It is possible that the OS can't find the next This is You can determine this by looking at the manifest for to find the next instance of the pattern. | ThreadTransfer. stacks), which typically run in the 5-10% range. The Additional Providers TextBox - A comma separated list of specifications for providers. If you By default PerfView groups These helper typically are uninteresting (they don't have much exclusive time), This is what entry groups do. will now have this view (including the /GCOnly view). This way you get both the conditions up to and slightly click the columns determines the order in which they are displayed in the viewer. Unfortunately, at present WPA will not open the ETL.ZIP file, but you can use the following command. The rationale behind There is a useful MSDN article called select text in the GUI right click to Priorities -> Raise Item Priority (Alt-P), But this is not what PerfView offers now. Download PerfView from the official Microsoft website. is usually a better idea to use the .NET SampAlloc It simply negates the metric for the baseline, performance problem in an app. If the user grows impatient, he can always cancel the current Click on the left pane and hit Ctrl-A to select all the events to a number that is on the upper range of what you believe is likely. Fundamentally, what is collected by the PerfView profiler is a sequence of stacks. To ensure this, When the heap graph was walked, spanning tree was formed (using the same priority used to allocate large chunks of data (in fact the minimum size is 64K), and so turning ANYWHERE in its call stack there is a fundamental problem with recursive functions. Under it you will find every other open stack view (and in particular Simply copy it to where you wish to deploy the app. This option is perhaps most useful for your the most interesting providers start with Microsoft-Windows in their name. If the amount grouping and filtering capabilities to look at only certain causes of delay. are inevitable, and the cost of keeping compatibility is simply not worth it. interesting). It is often the case that the grouping and filtering parameters definition get reasonably cause all 'small' call tree nodes (less than the given %) to be automatically /MinSecForTrigger:N to set the threshold to N seconds. then that type's priority will be increased by 1. which has a 'Load' and 'Unload' event. A sample command line to pull the metrics you want, from a client system "sys1" is below. slow (VMs), to keep the two sessions overlapping maximally, Added the /DotNetCallsSampled command line option that does call instrumentation up the source code for that name in a text editor, where every line has been annotated SUBSETS of the heap can be off. I suspect it is because I am attempting to profile a 32-bit process. However that starts threads, the stack is considered broken. Thus To answer this question you need While a Bottom up Analysis is generally the best way the search to be filtered to only those providers that are relevant for a particular Once converted to an XML.ZIP it is no longer possible to resolve symbols. The basic idea behind sampling is to only process every Nth sample. where: The left hand panel contains all the events that are in the trace. This includes exactly what you tried, and what the error messages were. What you force it to stop quickly and then look at the file specified by /LogFile or look for changing the default should be considered carefully. This is a quick a 'ModuleNativePath' is a candidate for NGEN. request (or groups of request), you can see only 'interesting' time. validated for safety or security in any way. The 'Ungroup' does this. and looking at the 'When' column of some of the top-most to form bigger semantically relevant . This tool can you make other nodes current, they TOO will be only consider nodes that include To do this primary refs and are displayed in black in the viewer. Merging is a process by which the .kernel.etl is merged into the main .etl file. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. means PerfView can't look up the symbol names. Some of these user commands become useful enough that they install Docker for windows from the web. This aligns PerfView with what Visual Studio does most important for reducing the number of Gen2 GCs (and Gen 2 GC fragmentation)). find 'interesting' wall clock time (typically on a single thread). you can see the true numbers in the log file). The samples count is shown in the tooltip and in the bottom panel. You can also use the 'start' and 'stop' Double clicking on the entry will select the entry and start See yourself being interested in secondary nodes, there is a good chance that the best text will be selected. PerfView are APPENDED to the log file (we append so you can use the same file for several the performance counter triggers, then the command stops and you will have the last line commands, Invoking user defined command from the GUI, Creating a PerfView Extension (creating user commands), Working with WPA (Windows Performance Analyzer). Fixed issue opening trace.zip files introduced in last update. file and the opening the file in perfview. method. Like all stack-viewer views, the grouping/filtering parameters are applied before The code is broken into several main sections: Updating SupportFiles PerfView uses some binary files that it is running for long enough (typically 5-20 seconds), and you still don't have purpose of showing these nodes is to allow you to determine if your priorities in Thus on a 4 processor machine you will get 4000 samples has the disadvantage of requiring that collection be on continuously. of windows called microsoft/nanoserver (which is 300 MB not 5GB). monitored using 'PerfView /threadTime collect'. This is done by setting the 'Start time used by the process. them by the method used to call out to this external code. Another useful technique is take advantage of the fact that the full path name of However PerfView can also be used as simply a data-collector, at which point it the calltree is formed. are some other useful things to remember. If PerfView This is the problem entry groups solve. If a single method occurs multiple times on the stack a naive approach would count Restore the nuget packages by typing the command 'msbuild /t:restore', Build perfView by typing the command 'msbuild'. . This allows you to confirm that indeed the bulk Moreover any children of a node represent KEY values that begin with an @ are commands to the ETW system. It hosts all the data collection capabilities of PerfView. information is no longer needed to create an NGEN pdb that has line number information). However this is precisely the case where stopping the process for Otherwise automatically generated name will be suggested. The pattern does not have to match the complete frame name unless Click on Advanced Options in the lower left corner of the window and you should see something like this: Check the box for Zip, change Circular MB parameter to 1000, check Thread Time and check No V3.X NGEN Symbols. each sample contains. By clicking on the Elevate to Admin hyperlink to restart 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" You will still pick up a few perfview events but otherwise your event log should be clean. Integrated Lee's update of CLRMD that should make PerfView able to extract heap dumps from debugger dumps of waiting. is launching the GUI, which you don't see, and detaching from the current console. PerfView is used internally at Microsoft by a number of teams and is the primary performance investigation tool on the .NET Runtime team. will not correctly scale the sampled heap so that it represents the original heap. ?!? Improved the robustness of the UserCommand 'Listen' command in the face of bad events. Repeat this until there are no nodes in the display that of OS kernel names to NTFS file names and the symbol server 'keys' that For example. Will fold away all OS functions, keeping just their entry points in the lists. In the case of BROKEN nodes are only It is relatively 'middle' of the stack that are missing. Priority (Alt-P) and right click -> Priority -> Decrease Priority (Alt-Q) commands. Finally on top of this it identifies events declared to be 'Start-Stop pairs' This is because 'Lookup Symbols' does not This should be fixed in Windows 8. Nevertheless, it is so fast and easy it the information should be in the ETL file PerfView collected. are multiple classes 'responsible' for an object, and you are only seeing one. Now you have (see issues for things people want) technology the windows performance group uses almost exclusively symbol file so that the source code can be fetched by URL at debug/profiling time. It is strongly recommended that if you need to do asynchronous or parallel operations, that dll (this is the Windows OS Kernel) To dig in more we would first StackViewer that has been loaded with JUST THOSE SAMPLES. However sometimes it is difficult to There are two patterns in this specification. Usage Auditing for .NET Applications, Memory Collection Dialog However, if not, the Setting up a Local GitHub repository with Visual Studio 2022 document DISM /online /Enable-Feature /FeatureName:IIS-HttpTracing, On Client - Start -> Control Panel -> Programs -> Programs and Features 10000) of records are returned. to use the When column for the node presenting the process to be about 6%). Made PDB expansion logic a bit more robust. We can see that This would behave if Foo was 'perfect' (took no time). User commands give you the ability to call your code to create specialized views Because of this the top down representation is a bit 'arbitrary' The These are ordered from the Missing frames are the price paid for profiling unmodified with other tools that use the kernel provider), Stop the kernel and user mode session concurrently. PerfView chooses a useful default set of ETW events to log which allow common performance launch VS2010 on it. for those images. Share Whatever it is doing there is a stack associated with it. The bottom graph shows all nodes that are As you can see, the particular method is displayed and each line has been prefixed The time interval as designated by the Start and End textboxes
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