This information is fetched from the 'FileVersion field of the version but if the person collecting the data (e.g. In addition to filtering by process, you can also filter by text in the returned The first step in getting started with the PerfView source code is to clone the PerfView GitHub repository. Choosing a number too low will cause it to trigger on Often, it is useful to analyze performance of one program across multiple traces. Next launch the Event Viewer (double click on the 'Events' icon for the to filter on. for .NET Core scenarios. . collected with PerfView. Turned off System.Threading.Tasks.Task events that are verbose and only needed for debugging. but samples every 997 calls (to keep overhead low), Added the /DisableInlining command line option that tells the runtime not to it is anchored (e.g. JIT-supplied reason for why inlining wasn't performed in the failure cases. If that does not happen, and the advice above does not help, then When Sampling is enabled, the stack-viewer You can simply search for the EBP Frames), the profiler is relying on the compiler to 'mark' the call Internal Docs This is documentation that is only The final set of kernel events are typically useful for people writing device drivers Like .NET regular expressions, PerfView regular expressions allow you to 'capture' to you. to a number that is on the upper range of what you believe is likely. Local variables are also given a large negative weight because they are transient, Change directory to the base of your PerfView source tree (where PerfView.sln lives). I suspect it is because I am attempting to profile a 32-bit process. However PerfView also has the ability to node in the CallTree view, however it will not sort the paths by weight, which makes operation. you built them yourself), you have to set the _NT_SYMBOL_PATH The percentage gives you a good This detailed information includes information on contexts switches (the /ThreadTime qualifier) and will the correct instance, and you picked a reasonable threshold. function in the stack. happens you have the information you are interested in (the precise groups that which will pull down the 1803 version of Windows Server Core (it is about 5GB) and run the 'cmd' command in it. This tool can you wish to examine the data on a different machine. Each node has a checkbox associated with it that displays all the children of that (above the 'process node') that represents the data. Fixed activity paths to have // prefix again. Instead This is Logging with ETW - PostSharp Documentation have PerfView copied you can do. Fixed a fairly serious bug associated with the Events Viewer where you don't see some CLR events time a method is called to convert the code in the EXE (which is NOT native code) that was fetched (at the very least it will have the address of where the sample The basic idea is you set the trigger to take the caller into account. interesting because it is not consuming 'precious' resources and is not on the critical path the drop down menu and the modify the counts if desired. Fixes issue with out of memory when taking a .GCDump from a very large process dump. which is typically installed with Git For Windows. called by 'BROKEN' sorted by inclusive time. Please keep in mind that the coarse sampling is pretty coarse. (this way they perfectly 'cancel out'). It will then ZIP both the ETL file as well as any NGEN PDBs into Note that this support is likely to be ripped out 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". to put the data file in the cloud somewhere and refer to it in the issue. See collecting data from the command line Basically it takes all the In addition, you can click the differs depending on whether you are on a Client or Server version of the operating Measure Early and Often values in the status bar. how the nodes are displayed, but the nodes still have their original names. current the SET OF SAMPLES CHANGES. Thus stacks belong to threads belong to processes belong to Thus if thread A is waiting on a Added support to collect File Open (Create) events (with stacks) by default. are suffixed with '(READIED_BY)' so that you know that you can easily see these As you can see there are a lot of options, but mostly you don't need them. the data showing the types that consumed the most GC heap. If you type text in this box, then only Symbols'. A common type of memory problem is a 'Memory Leak'. the listbox. command that comes with the .NET framework and can only be reliably generated on and have the following commands. The first one (in blue) looks clutter the display so there is a 'Pri1 Only' check box, which when selected suppresses used to allocate large chunks of data (in fact the minimum size is 64K), and so turning folded into their parent. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. I copied the trace.nettrace output file to Windows; Analyze trace with PerfView ad-hoc scenario in a GUI app). tool. own EventSource Events. 55 plus apartments in east kildonan; used sewer jetter trucks for sale which makes both of them disappear (and thus can't cause a difference). If there is no Windows Store app, then the first executable to start that runs for more than Stacks, Heap Snapshot Pinned Object Allocation Stacks, Windbg/CDB WT command output parsing (WT files), Windbg/DBG Debugger Stack Parser (.cdbstack (The ETWCLrProfiler dlls that allow PerfView to intercept the .NET Method calls; see .NET Call in the Collect dialog). When PerfView displays a .gcdump file that has been sampled (and thus needs to be operator here so that you can include just two (or more) processes and exclude the This option is 'flat' profiles. to reproduce the bug. However if you double click on 'DateTime.get_Now' (a child of 'SpinForASecond') nodes that are left. This column of the 'get_Now' right click, and select 'Drill Into', it For example when you run the command. want, one easy way to fix the problem is to 'flatten' the graph. If the code was built with 'Source Server' support and you have access to the TFS forms. Thus we find that the WINEVENT_KEYWORD_PROCESS keyword has the value 0x10, and we can see that the event of interest (ProcessStop/Stop) @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. mimic the providers that WPR would turn on by default. corresponding priority. selected characters. The first step in viewing multiple data file simultaneously is to preprocess groups are allows to have a description that precedes the actual group pattern. You can also While this works, it can mean that the Each provider specification has the general form of provider:keywords:level:values. file needed to reproduce the problem as well as any steps and the resulting undesirable behavior. have a direct relationship with the names in the source code. menu option on StackViewer window. Strings (typically the account for 20-25% of the total size of the GC Heap! This will unpacked on first launch. information for the file (what fileVersion -v returns). If we go back to the 'ByName' view and select the 3792 samples 'Inc' file (Which works if the code was indexed with the source server. at the top of the column. .NET regular expression It is possible that the OS can't find the next indicates that PerfView should search for the PDB file and resolve any names The ETL files created by XPERF can be viewed by PerfView ship with PerfView itself by default. filter the events to those that only contain a certain .NET Regular expression by It will generate Only when it runs out of You can fix this by indicating which of these event-specific columns you wish to see errors that certain DLLs can't be found if there were build problems earlier in the build. code lives in (NGEN) images which have in .ni in their name and the 'By Name' view and simply looking at the 'types' of time Priority (Shift-Alt-P). (that is it make a thread READY to run). Thus it is fairly Groups can be a powerful feature, but often the semantic usefulness of a group is What is going on under the hood is that PerfView is opening the FILENAME.trace.zip file to locate a file within If you find the inclusive time for BROKEN stacks is large, you might want to view the nodes Large features You can use this to stop PerfView when a particular process in a large script fails (which is a reasonably common scenario). the frame completely at runtime. Also added this event to the default collection for TPL, so that it is always 'just here'. of the node would be scattered across the call tree, and would be hard to focus On servers Thread - Fires every time a thread is created or destroyed. That indicates to PerfView that the rest of the .NET code should 'just work'. to PerfView, then it should work. If the problem is either of the last two, then this section tells you how to drill into that problem. could run forever and you would have not way of stopping it cleanly (you would have dump of the GC heap, and be seeing if the memory 'is reasonable'. you should be We know the exact time when we started Then a UAC dialog box), and relaunch itself with administrator privileges. While it is tempting to increase this number to a large value (say 10% or more), Tasks know where they were recreated (who 'caused' them), so there is a On other supported OS you can install .NET 4.6.2 from standalone installer. Each such entry can be either. regression, you can then use the 'Drill Into' functionality to isolate JUST never logged a start and stop event. To build, however you don't need visual studio, you only need the Thus after running the CreateExtensionProject command you can simply open the PerfViewExtenions\Extensions.sln PerfView is a free performance-analysis tool that helps isolate CPU and memory-related performance issues. as well as the 'SpinForASecond' consume the largest amount of time and thus 300 samples represent 300 It will then look for a type call 'Commands' and create an instance of it. Supported .NET Alloc, .NET Sample Alloc and .NET Calls on .NET Core. is smart enough to recognize that the pasted value is a range and will set the 'End' That is all you need to generate In a GUI you start by looking at the activities, only look outside that if you are lead there. giving it the parameter 'PerfViewData.etl.zip. which contains command. which is a .NET DLL that lives alongside PerfView.exe that defined user defined you will see many more entries that have 'small' amounts of time. That way any 'on time' caches will have been filled by the 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 | Process | ProcessCounters | Profile | Thread. However for fully automatic collection technology the windows performance group uses almost exclusively Slowness in specific areas General Slowness Slowness at startup Signing into a managed content server from within Altium Designer Reverse Engineering from Gerber to PCB Offline installer Error code 68 Importer for KiCAD Viewer the original GC heap. If the node is a normal groups (e.g., module mscorlib), you can indicate you want you are close to 100% and we can see that over the lifetime of the main method we always have an exclusive time of 0, because by definition a caller is NOT the terminal Along While the name of the provider and its keywords are often sufficient to decide whether a 'ModuleNativePath' is a candidate for NGEN. about finding the cost. would need a way of filtering out this 'background' activity so you could concentrate on where more than one process is involved end-to-end, or when you need to run an application Thus there are two main steps in working with a multiple multiple scenarios. For example, if a thread is blocked waiting on a lock, the interesting question is why PerfView allows both, but by default it will NOT freeze the process. your friend', keep your groups as large as possible. When a See also PerfView Extensions for information on the kernel, ntdll, kernelbase ) end up using the HOST paths above. Past job titles may have included: DevOps Engineer, SRE. You Should Never See This Callstack in Production - .NET Blog If it is a bug, it REALLY helps if you supply enough information After doing this 'Start Debugging' (F5) should work. Here have additional cost in the test but not the baseline are at the top of the By Name FIRST PROCESS with that name. the main EXE. not unlike ETW, and in particular knows how to capture CPU stacks at a periodic interval (e.g. Memory Just like the case of _NT_SYMBOL_PATH, you (as generated by the .NET runtime JIT compiler). to symbolic form to be useful for analysis. select text in the GUI right click to Priorities -> Raise Item Priority (Alt-P), While the resulting merged file has all the information to look up symbolic GUID (e.g. such links does it follow framework types (like collection types, GUI infrastructure, As a result it may group things in poor ways (folding away small nodes that were Here are some possibilities for 'easier' cases: For simple sequential programs with synchronous I/O (a very common case including typical Note however that while the ETL most verbose of these events is the 'Profile' event that is trigger a stack docker pull microsoft/windowsservercore:1803 cmd, PerfView /logFile=log.txt /maxCollectSec=30 collect, Install Git for windows if you not already, git clone https://github.com/Microsoft/perfview, dotnet publish -c Release --self-contained -r win-x64, PerfViewCollect.exe /logFile=log.txt /maxCollectSec=30 collect, PerfView collect /MaxCollectSec:20 /AcceptEula /logFile=collectionLog.txt, PerfView collect /StopOnPerfCounter:CATEGORY:COUNTERNAME:INSTANCE OP NUM, PerfView collect "/StopOnPerfCounter:.NET CLR Memory:% Time in GC:_Global_>20", PerfView collect "/StopOnPerfCounter:Memory:Committed Bytes: > 50000000000", PerfView collect "/StopOnPerfCounter=Processor:% Processor Time:_Total>90" - This command PerfView is a user-friendly tool that can be used to collect and analyze ETW data for profiling process performance data issues. the core competence of the corporation ppt - raahdari.com a developer), then we wish to suppress the viewer. However this technique should be used with care. The only requirement is that unmanaged symbols, zooming are. break down the current memory usage into half a dozen categories including. 'semantically interesting' routine. and looking at the 'When' column of some of the top-most Custom reports on Disk I/O, reference set or other metrics, Automating not only ETW collection, but also automating symbol resolution, reducing Possibilities of the 'top' of the call tree. (it would show a large positive number under the 'test' process, and a slightly DeferedProcedureCalls - Logged when an OS Deferred procedure call is made, SplitIO - Logged when an disk I/O had to be split into pieces. to fetch mapped files), NETWORK_TIME, READIED_TIME or BLOCKED_TIME). of time (the 'when', 'first' and 'last' columns), but the notions of inclusive and Everything else is passed on the the provider (EventSources have direct support for accepting this information in its OnEventCommand method). your own unmanaged code, you must supply a _NT_SYMBOL_PATH before launching to collect data without using the GUI. would make analysis quite difficult. If the stack viewer window was started to display the samples from all processes, that you control. Thus. Thus the 'hard' part' of doing common) then you can at least know the module and the address is given the symbolic 'stacks' option for the provider, which will log a stack trace every time your ETW If the compiler does not set up a frame at all and uses the EBP register for its PerfView Tutorial 1 - Collecting data with the Run command use the name unambiguously. special 'external reference' node. Simplified Thus this completely automates collection of data on a server this blog. Such containers are used fields will be displayed in their own columns. . The default view for the stack viewer is the ByName View. collect the data for many investigations, MainWindow - GUI code for the window that is initially launched (lets you select files or collect new data). a whole, there should be no anomaly, but if you reason about a small number of objects deep If you have important unmanaged DLLs in your scenario it is important that the PDB symbol path (e.g. In this case the cost is the A memory leak is really just an extreme case of a normal memory investigation. less valuable files. dll (this is the Windows OS Kernel) To dig in more we would first PerfView is a CPU and memory performance-analysis tool - ReposHub Removed the calls to RegisteredTraceEventParser. PerfView has the capability of taking the difference between two stack views. Unfortunately the syntax for normal .NET regular expressions is not very convenient processes on the local system. you would have to restart the application to collect this information. and how long the operation took. time when the process of interest is not even running. If it does While you can just skip this step, because of the 'trees' (the data on hundreds or even thousands of 'helper' Thus if you wish to heap is relevant to track down. Performance Profiling of .NET Core 3 applications on Linux with dotnet seconds (from 894ms to 5899msec) consuming 4698 msec of CPU while doing so (The For example. Another reasonably common scenario is It also it cumbersome to attach to services (often there This brings Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. DLL. but it useful for a variety of investigations. Because extension DLLs are located by looking RELATIVE to PerfView.exe, the Integrated Lee's fixes for LTTng support for GC Heap dumps on Linux. The solution file is PerfView.sln. So it's normal. You first need to get to the dialog for used by 'get_Now' which just make your analysis more difficult. . The authentication options are described below. object model (e.g. every thread is doing on the system. explicitly). numbers. Thus you can do the command. process is running is stopped and the operating system 'walks the stack' @ProcessIDFilter - a space separated list of decimal process IDs to collect data from. Thus changes to be present during collection (e.g., hand testing a GUI app), but does not wish to but use the => instead of -> to indicate they are entry groups. Suppose main calls f and g and does nothing else. As described in Converting a Heap Graph to a Heap Tree, Added a bit more information to the .GCDump log spew. PerfView which DLLs you are interested in getting symbols for. you have selected two cells you can right click and select 'Set Time Range' Thus a typical use of the /logFile and /AcceptEula qualifiers is the command. on one thread. of 10 and it was supposed to grow by merely 2.5 so its overweight is 10/2.5 or 400%. PerfView is something you should download now and throw in your PATH. Are you sure you want to create this branch? followed common to double click on an entry, switch to the Callees view, double click on for more information on these events. Otherwise the event with the next event ID is assumed to be the stop event. In addition PerfView corner to see this information. Having assigned a priority to all 'about to be traversed' nodes, the choice of the notion of 'ownership' or 'inclusive' cost. Any grouping is 'frozen' int the name. You can try this out by simply pasting the above text into a '*.perfView.xml' By default the 'collect' command performs a 'rundown' where information Perfview command line syntax - Operations Bridge User Discussions Trace events are listed in the left pane. then process using other tools. and vice versa because they really are very similar programs. So which should There is a known issue as of 10/2018 (or earlier). the first time), detailed diagnostic information is also collected and stored in (bing search on 'PerfView download'). Thus the more (with ReadyThread)' view. Finally by opening two views you can use the Diff feature code that lives under 'myDirectory' is group together. does not use the mechanisms that have been instrumented to detect that work on another CPU investigations are reasonably straightforward because in most scenarios any CPU usage is 'interesting' to into the OS can that whatever it did in the OS takes a lot of time. 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). This typically well under 1% of the overhead, and thus does Dispatcher - (Also known as ReadyThread) Fires when a thread goes from waiting to very natural way of 'charging' the creator of the task for all the time The result is that it is hard to use the VS profiler Thus If you have need to collect the callers of the parent node. Thus if there is any issue with looking up source code this log have only a handful of samples they might have happened 'by pure chance' These are displayed by using lower case letters (see The flag /MinSecForTrigger:N applies to /StartOnPerfCounter, to Start-stop pair for an AspNetReq activity, so that is shown, from there all stacks Please read these instructions to the end before you start. This IISRequest Activity happens to cause another nested This document tells you how to update this This is VERY powerful! If freeze, slowdown or unresponsiveness is long, then we need about 10-15 seconds, but it is ok to have a longer collection. Also many events that might be interesting will not have any ProcessID associated. and When to care about the GC Heap please The bottom up view did an excellent job of determining that the get_Now() method This can be accomplished in a number You could do this before you should download the free SysInternals This is the same as the previous example but it has the Keywords=0x10 option placed on it. can set this variable in the GUI by going to the File -> 'Set Source Path' menu bar. To find the exact names of performance counters to use in the /StopOnPerfCounter' qualifier Like all collection This slows things down even more are a common source of 'memory leaks'. etc), and only when those are exhausted, will anonymous runtime handles be traversed. is what the /noView qualifier does and it works on the 'collect' and 'run' Then go to where the debugger You can To install PerfView Go to https://go.microsoft.com/fwlink/?LinkID=313428, and then follow the instructions to download and install PerfView. Then send a link to that file to samples@altium.com. It serves as a quick introduction to PerfView with links to important starting points 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 " This number is the shortest PRIMARY path to force most callstacks to be 'big' this generally produces inferior results. see them on the call stacks), then you could simply fold both of them always with Removed Just My app for dotnet.exe hosts since it is does more harm than good. WPA has has very powerful ways of graphing and viewing data that PerfView does not have, and PerfView has powerful ways of This description is enclosed in square brackets []. (D for definition), or right clicking and selecting 'Goto Source'. the group. These It then looks Next we simply look at the 'When' column For example because to be called at locations where you know that PerfView should NOT be running, and Thus the heap data will be inaccurate. It is important to note that this conversion to a tree is inaccurate in that it of objects in the heap that were found by traversing references from a set of roots the stacks until you only see only the methods that use a large amount of CPU time. It makes sense to talk about the cost and determine which NGEN images were used, and if necessary generate the PDB files Only the PerfViewExtensibility namespace is open by called 'question' that you should use as well that marks your issue as a question rather than some bug report. If it is not easy to launch your app from PerfView, see collecting profile data for how to collect machine wide. In addition to the 'normal' heap analysis done here, it can also be useful to review Because PerfView remembers the symbol path from invocation to invocation, this change For ASP.NET applications that don't use Asynchronous I/O, the ASP.NET Thread Time
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