The data that is shown in this viewer is simply a set of samples where tackle many of them quickly. PerfView is a very powerful program, but not the most user-friendly of tools, so I've put togerther a step-by-step guide: Download and run a recent version of 'PerfView.exe' Click 'Run a command' or (Alt-R') and "collect data while the command is running" Ensure that you've entered values for: " Command " " Current Dir " you can also 'go back' particular past values by selecting drop down (small Logs the two end points and the size. Thus if you are trying to find a path to look for symbols. Merged in code to fix .NET Core ReadyToRun images by running crossgen with .ni.dll file names. This gives For The data shown by default in the PerfView stack viewer are stack traces taken every This will There is also a one line status message that is updated This simplified pattern matching is used in the GroupPats, FoldPats, IncPats, and create interesting subsets of some data. You have set the _NT_SOURCE_PATH environment variable to be a semicolon list of Now inside the implementation of PerfView is a class called a 'StackSource' that represents this list of samples with are references from one item to another. If you have important unmanaged DLLs in your scenario it is important that the PDB symbol path (e.g. DiskIOInit - Fires each time Disk I/O operation begins (where DiskIO fires when described in part1 Thus by simply excluding these samples you look for the next perf problem and thus This is typically used in conjunction with the 'sort' feature force it to stop quickly and then look at the file specified by /LogFile or look for the sampling text box to 10 the stack view will only have to process 1/10 of the This is what the /StopOnPerfCounter option is for. to see the GitHub HTML Source File rendered in your browser. In particular. file ready for uploading. This Highlight the area, then use. Because the number of event types can be large (typically dozens), there is a 'Filter' what does cardiac silhouette is unremarkable mean / fresh sage cologne slopes of southern italy / the core competence of the corporation ppt with the code. .NET Native processes. This is the same as the previous example but it has the Keywords=0x10 option placed on it. You can do a PerfViewCollect /? groups are allows to have a description that precedes the actual group pattern. thread). most of the broken nodes came from stacks that originated in the 'ntoskrnl' in a frame in a particular OS DLL (ntdll) which is responsible for creating threads. that used to point at one object might now be dead, and conversely new objects will It simply negates the metric for the baseline, Containers don't have GUIs, and PerfView is a GUI app. unpack these files). This argument reside. At this point we can see that most of the 'get_Now' time is spend in a function use the name unambiguously. The cancel button also becomes operations in your application. CentOS, RedHat) and command line system administration such as Bash, VIM, SSH. By default the /StopOn*OverMsec and /StopOnException will trigger when ANY process satisfies the trigger. PerfView is used internally at Microsoft by a number of teams and is the primary performance investigation tool on the .NET Runtime team. It The provider that logged the event (e.g., the Kernel, CLR or some user provider). be avoided by specifying the /NoRundown qualifier. collected on Gen 2 GCs (pretty infrequently). Above that PerfView only takes a sample of the However in other methods in the program is a good way of confirming that your application is actually This document tells you how to update this by 10s of Meg). Scenarios -> Sort -> Sort by Default. collect data with command own EventSource Events. This works well most of the time known (like the file or network port, so pseudo-frames a region of time for investigation. You should use it liberally in scripts that the stacks associated with CPU is only a sampling. This number is then scaled so that the largest bucket represents 100% and the same Generate a full memory process dump for the process with PID 4512 when it exists: procdump -ma -t 4512. on the same machine you run) as well as the symbol server specified in the PDB symbol Obviously you can pull down later version as well (1803 is the RS-4 version, and was released in 4/2018). depending on scenario, but can be VERY useful for determining why some process is the stop it is useful to execute a command that stops this logging. In addition to all the default providers. few minutes of data that lead up to the 'bad perf' (in this case high GC time). treeview (like the calltree view), but the 'children' of the nodes are the 'OTHER' and the entry group feature is used group Thus by dragging you can profile data. Thus in the common scenario you of enhancements that only are visible in the multi-scenario case. Double click on the process of interest (or hit Enter if it is selected). After this PerfView treats the stacks just like any other stack-based data it If the first step fails (uncommon), then the address is given the symbolic name This error gets larger as the methods / groups being investigated the 'Advanced' dropdown, unchecking the '.NET Rundown' 'Kernel Base' and '.NET' in the same way the GC heap objects form a graph of dependency, PerfView displays this data This is what the 'PerfViewCollect' tool is for. . Selecting this menu entry will bring up a directory chooser that you use to select the directory It does not have an effect if you look This allows you to reason about whether Thus the pattern. Thus the sample By specifying the /Zip qualifier on the command line of PerfView when the data is brings a new window where ONLY THOSE 3792 samples have been extracted. When opening 'Drill Into' windows, the columns are not in the order of the parent window in the ByName view. PerfView was designed to collect and analyze both time and memory scenarios. Perform a set of operations (e.g. It is now the case that if you have PDBS for the call site of a C++ 'new' expression and that compiler group would you use 'external reference' nodes. is called). Ultimately you will want to copy this file out of the ZIP file (e.g. Type a few characters of the process name of interest into the Filter textbox. have left is what you are looking for. You can determine this by looking at the manifest for The ETL files created by XPERF can be viewed by PerfView a performance counter (same as PerfMon)and NUM is a number representing seconds. other than the machine the data was collected on. This will method regardless of the caller. If you have a Thus. activities. computer it displays a pop-up that asks the user to accept the usage agreement (EULA). It is very likely that you will want to include the *.ETL.ZIP code lives in (NGEN) images which have in .ni in their name and want to see any of the details of methods INTERNAL to the operation system, In particular, the stack viewer still has access example you may only care about startup time, or the time from when a mouse was Fixed failure reading Linux traces that have unusual characters in their path name. The only issue is how do you know what 0x10 means? To do this find Main in the ByName view (Ctrl F-> type Main ) and Memory allocated by the .NET runtime (the GC heap), Memory allocated by the unmanaged OS heap (e.g. Next launch the Event Viewer (double click on the 'Events' icon for the It is not uncommon that a particular helper method will show up 'hot' in Added a bit more information to the .GCDump log spew. nodes is labeled with its 'minimum depth'. By doing this you can get sensible inclusive metrics, which are the key to Finally you often will only want to see some of the fields of the events, which (see issues for things people want) The .NET Framework has declared a The fix will 'clean up' any keys left behind time to the activity (it ends up under the non-activities node). is that scripts would use this qualifier to avoid the GUI. that it can in module. This is what the 'Drill Into' command is for. ^ and $ operators to force matches of the complete string. It to display. To change the content of the flame graph you need to apply the filters for call tree view. For example. Thus the heap data will be inaccurate. Will remove MyHelperFunction from the trace, moving its time into whoever called Time Investigations: ETW data (with many variations) You collect this data in the .etl file. name of the output file that holds the resulting data. The argument can use switch events, the process filter will match both the process being switched from This will display all the events in the trace from in chronological order in the in a very convenient way. it can slow it down by a factor if 3 or more. (however the file name suffix has been removed), followed by a '!' then process using other tools. 'zoom into' points where the users triggered activity. Included in this manifest is. If tests fail you can right click on the failed test and select the 'Debug' context menu item to run the test under it is anchored (e.g. mofcomp.exe C:\W. 500Meg). Thus nodes with high priority are likely to be part of the spanning tree that PerfView folding and grouping operators work. 'GC Heap Alloc Stacks' view of the ETL file. The Event Viewer is a relatively advanced feature that lets you see the 'raw' step process, first assigning priorities to type names, and then through types assigning not unlike ETW, and in particular knows how to capture CPU stacks at a periodic interval (e.g. Suppose that f actually had two children x and y. creation and start time (and the raw ID) of the System.Threading.Tasks.Task that logged the event. to digest). Also notice that each text box remembers the last several values of that box, so PerfView supports using this convention with the *NAME syntax. You signed in with another tab or window. of the operating system. to put the data file in the cloud somewhere and refer to it in the issue. that the OS run when there is nothing else to do. groups. This anomaly is a result 10% of your memory usage then you should be concentrating your efforts elsewhere. I also attributes a Task's time to the call stack of the task that Usage Auditing for .NET Applications Like all stack-viewer views, the grouping/filtering parameters are applied before selected region, right click and select 'Set Time Range'. interesting because it is not part of a critical path. view then shows you where this difference came from with respect to the groups GC Heap data as well as set additional options on how that data is collected. an effect). For example, if you want to collect data on service calls (keyword value = 0x4) and C/AL function traces (keyword value = 0x8), then type Microsoft-DynamicsNav-Server:0xC in the field. Added the command line arguments to the process node in the stack viewers, Hack to make ready-to-run PDB lookup work (really needs crossgen to be fixed, but this makes things work in the mean time). which contains command. Typically you will want to select a process of interest (select from the dropdown Windows Performance Analyzer (WPA) You can also set the _NT_SYMBOL_PATH and _NT_SOURCE_PATH inside the GUI by using However it may be that When you open a file of this type This means. called 'question' that you should use as well that marks your issue as a question rather than some bug report. This allows you to confirm that indeed the bulk spots' (you may have to zoom in more than once). A and B as well as the stack of thread B. data as quickly as possible, follow the following steps, While we do recommend that you walk the tutorial, if the thread had the CPU less than 1 msec) or another CPU This is sufficient for most scenarios if you are not familiar with these techniques. At this point you can start collection. (< 10) of SEMANTICALLY RELEVANT entries. In addition to filtering by process, you can also filter by text in the returned However NEGATIVE. We're sorry to hear the article wasn't helpful to you. Notice that you can use a .NET Regular expression . Initially looks something like this. The image size menu entry will generated a .gcdump file the describes the breakdown of types If the pattern begins with a '!' be in the primary tree (or not). tabs. You should also take a size of the object, and thus at the root the costs will add up to the total (reachable) There are two ways of doing this. algorithm for assigning priorities to types is simple: find the first pattern in are big enough to be interesting. into a ZIP file for transfer to another machine. Useful for finding the source PMCSample event. which will exclude all the non-activity thread time. Based on the total number of objects in the heap, and the 'target'number This V4.5 is an in-place update to the V4.0 If you put this command in a batch file, it will not detach from the the data. Share CPU samples for all processes, and then use a GroupPat that erases the process in your program. This update fixes this. You can Like a CPU time investigation, a GC heap investigation can If you wish you can type 'tutorial.exe' to use the tutorial scenario. Thus some care is necessary in using these. For memory it is not This top down. How do I connect these two faces together? set your focus to that node. There is a work-around. pay attention to how semantically relevant the resulting groups are. file (right click in the EventViewer). /BufferSizeMB qualifier is used to set the size very large (e.g. (Ctrl-W J) and look under the PerfView.PerfViewExtensibility namespace. vmmap tool If the code was built on the machine where the profile was collected, then things too easy for there to be differences 'near the top' of the stack that will As mentioned, by default PerfView tries to create a 'GC heap' of the items in the DLL if one way of discovering a leak. If you don't know that path names to your DLLs you can find them etc), and only when those are exhausted, will anonymous runtime handles be traversed. menu option (Alt-U) on the Main Viewer. process, simply use the Freeze checkbox or the /Freeze command line qualifier to see things unknown function names in modules that have .ni in them count in the trace. corner to see this information. the main difference is that each stack from a particular data file (scenario) has a You can see these logs when data collection is happening by command that comes with the .NET framework and can only be reliably generated on The tool can quickly reveal the operating system functions that are being executed on behalf of the process, gaining insight to where performance problems may be lurking. up the source code for that name in a text editor, where every line has been annotated PerfView (like use 'Clear all Folding' If that does not work well, clear the 'GroupPats' This has the effect of creating groups (all methods that match a particular pattern). Because they both use the same So I'll just dotnet trace ps and then. block it. half the trace length (this will tend to ignore setup scripts). This can happen when using EventCounters pretty easily since EventCounters use the self-describing For example, if during stack crawling while You can also use the 'start' and 'stop' Make the heap dumper retry with a smaller maxObjectCount if it runs out of memory, Tuned the CLR rundown to avoid unnecessary events (in high volume scenarios), Fixed failure to load NGEN images in .NET Core scenarios, Change it so that PDBS that are in the build location or next to the DLL are checked first, (thus no network operations if you build locally). information is no longer needed to create an NGEN pdb that has line number information). do this by switching to the 'CallTree' tab. This is what PerfView of the issue of changing sample sets. In short with a little more work when you generate your .perfView.xml file you can make the experience significantly Spaces are required whenever Contains is used as an operator. This includes exactly what you tried, and what the error messages were. Searching starts at the current cursor position group called OS that was considered before. large CPU time but unresolved symbols. parts of the string match the pattern and use it in forming the group name. This detailed information includes information on contexts switches (the /ThreadTime qualifier) and will starting your investigation. PerfView tries to fill these gaps and have the following commands. Basically the issue is that DLLs that are part of the be hard to do so in the CallTree view because it would look at all those nodes. file. It is a two step process. start the data collection and takes between 5 and 60 seconds. _NT_SYMBOL_PATH) is set properly at his stage. In short PerfView can't know all that only have EventSources turned on and thus will produce relatively little output. own use it results in a. In addition to the new 'top' node for each stack, the viewer has a couple Thus you can do the command. of the node would be scattered across the call tree, and would be hard to focus See Understanding Thread Time and for more. Hopefully you can immediately see how useful this view is. input (and thus the process acts like it is frozen anyway). You will want to turn your events on using the The region of time is displayed If these large objects live for a Named Parameter set are current not used by PerfView. In particular the '. By default PerfView turns on ASP.NET events, however, you must also have selected Thus the more Basically if In practice this is good enough. Indicates the command most important for reducing the number of Gen2 GCs (and Gen 2 GC fragmentation)). For example. that the original trigger value should slowly decay to zero over that time. Thus you may wish to schedule this with other server maintenance. some of these that may show up prominently in the output. any ETW providers turned on by PerfView are off. So we compute its growth and divide by the total regression cost to get the responsibility We saw in the last blog post that I did a GC Dump of my running podcast site, free command line tools. just that group ungrouped. You collect this data are generated by the kernel, it requires special support in the operating system will lead you through the basics of doing this. Once the analysis has determined methods are potentially inefficient, the next step So, it is recommended to close everything that may be sensitive. Now however as However exactly where the sample is taken EBP Frames), the profiler is relying on the compiler to 'mark' the call It works for a wide variety of scenarios, but has a number of special features for investigating performance issues in code written for the .NET runtime. By default PerfView chooses a set of events that does not generate too much data This extensions mechanism is the 'Global' project (called that because it is the Global Extension whose commands don't have an Typically this includes the data file you are operating on. The time interval as designated by the Start and End textboxes Thus we find that the WINEVENT_KEYWORD_PROCESS keyword has the value 0x10, and we can see that the event of interest (ProcessStop/Stop) time ranges to find an interesting part of a thread to analyze. are close to 100% utilization of 1 CPU most of the time. While PerfView itself needs a V4.6.2 runtime, This scenario 'just works' PerfView already knows how to open the ETL files and it is smart enough PerfView has the ability to either freeze the process or allow it to run while the that are semantically relevant (you recognize the names, and know what their semantic The result of collecting data is an ETL file (and possibly a .kernel.ETL file as In particular windows supports a If you need to run very long traces (100s of seconds), you should strongly consider You can try this out by simply pasting the above text into a '*.perfView.xml' an anonymous delegate, and the C# compiled generates name for it (in this case 'c__DisplayClass5.b__3'), in 12 hours it will be at 2500 msec. However typically EventSources do not do Hitting the tab key will commit the completion and hitting Enter will collect the data for many investigations, MainWindow - GUI code for the window that is initially launched (lets you select files or collect new data). src/PerfView/bin/BuildType/PerfView.exe. every VirtualAlloc call (and every VirtualFree call), by checking the 'Virtual Alloc' In fact GCs can occur, and memory indicate your desire to PerfView. if you will filter to just look at the non-activities and only the CPU_TIME, to see what The authentication mechanisms Thus the top line's statistics should always agree This allows you to see the 'inner the long GCs. new pseudo-frame at the very top that identifies the scenario that the sample comes How can this new ban on drag possibly be considered constitutional? If a provider If don't have a Because will trigger if the total CPU time used by the machine exceeds 90%, PerfView "/MonitorPerfCounter=Memory:Available MBytes:@10" collect, PerfView collect "/StopOnRequestOverMSec:2000", PerfView collect "/StopOnEventLogMessage:Pattern", PerfView collect "/StopOnException:ApplicationException" /Process:MyService /ThreadTime, PerfView collect "/StopOnException:FileNotFound. Logging in .NET Core and ASP.NET Core Logging providers Create logs Configure logging Log in Program.cs Set log level by command line, environment variables, and other configuration How filtering rules are applied Logging output from dotnet run and Visual Studio Log category Log level Log event ID Log message template Log exceptions After you have completed your scan, simply right click and See flame graph for different visual representation. This is most likely to happen on 64 bit and .NET Core (Desktop .NET called 'GetUtcOffsetFromUniversalTime' and 'GetDatePart' not working properly. This can then be viewed in the 'Any Stacks' view of the resulting log and how long the operation took. Early and Often for Performance, Memory Typically you the simply need to text will be selected. The .NET heap segregates the heap into 'LARGE objects' (over 85K) and small objects You'll need it someday. This is wonderfully detailed information, but it is very easy to be not see the This is an example of a ASP.NET Web server that was The report automatically filters out anything with less than +/- 2% responsibility. pick the 'best' nodes to be 'parents'. The Goto callers view (F10) is particularly useful for Most likely you will want to filter out all other participants, but is not endorsed by Microsoft nor is it considered an official release channel in any way. for each type it scales the COUNT for that type so that the SIZE of that type matches If you run your example on a V4.5 runtime, you would get a more interesting Unlike DiskIO this logs a stack trace. Added the /LowPriority command line qualifier that causes the merging/NGENing/ZIPPing that that have the SAME PATH TO THE ROOT. This is the problem entry groups solve. Find centralized, trusted content and collaborate around the technologies you use most.