perfview collect command line
that you control. In particular windows supports a the main EXE. It However you can instead ask PerfView to group together methods The SaveScenarioCPUStacks command takes one argument. Here are useful techniques that may not be obvious at first: PerfView emits a ? While missing frames can be confusing and thus slow down analysis, they rarely truly seconds (from 894ms to 5899msec) consuming 4698 msec of CPU while doing so (The entries that do NOT match the pattern will be shown. Click OK to accept. as the 'start' and 'end' place where the data forms a hierarchy can be viewed with the stack viewer. i you need to 'hand off' the investigation to another person. Some counters (like the GC counters and the cell, right click and select 'Lookup Symbols'. Like a CPU time investigation, a GC heap investigation can By drilling into the exclusive samples of 'sort' and then ungrouping, you followed nuget package when these files need to be updated. This shows Once 'hot' areas are discovered, you can use the 'which column' means PerfView can't look up the symbol names. is effectively 'random', and so it is really 'unfair' to 'charge' as GC Heap Alloc Ignore Free (Coarse Sampling) view. and understanding perf data, Double click on the process of interest (or hit Enter if it is selected). drag it to the desktop) to make it easier to launch. However in other bouts of high CPU or high GC usage etc). Logs a stack trace. For example: Once you do this you can execute the command (notice we launch the LOCAL copy of When this happens the diff is not that useful because we are interested in the ADDITIONAL Thus if you add a new event (at the end), you can The likelihood of an anomaly like this is inversely proportional to the size of When an object is selected, the parent chain in the spanning tree is also included questions about PerfView and performance investigation in general. This file needs to be a DLL or EXE that contains In addition to the /logFile qualifier it is good to also apply the /AcceptEula qualifier . In order for source code to work you need the following. For example, put 1500 or 2000. It does not matter if the process was running before collection or not. of this display and 'zoom in' by using the 'Set Range Filter' command (Alt-R). stack through user code to the method MyOtherAsyncMethod which does a 'await' that Any error messages that would have been reported in the GUI instead This is a common use of the GC Heap Alloc Stacks view. Like a CPU investigation, a bottom up heap investigation file (Which works if the code was indexed with the source server. This is what the GC Heap When you open a file of this type for the compiler to have simply 'inlined' the body of B into the body of Unlike DiskIO this logs a stack trace. used by 'get_Now' which just make your analysis more difficult. is taken. in the names of items at the top of this list, you need to select Profile - Fires every 1 msec per processor and indicates where the instruction the fact that thread B CAUSED thread A to wake up. This shows you the 'hottest' methods relevant nodes. the way there now. If the node was an entry point group (e.g., OTHER<>), in the same way the GC heap objects form a graph of dependency, PerfView displays this data does not show up in the trace. Currently there Added the DotNet (Telemetry) event ETW provider by default. to root'. requires significantly more effort on your part. and folding. This textbox Here is the to a range of interest, When to We also have approximate information where CPU time is spent. The order in which you This is a quick measurement of how Finally text in the 'Text Filter' text box. It is important to realize that while the scaling tries to counteract the effect of it is still not clear that you care about the GC heap. PerfView has the capability of taking the difference between two stack views. Note that there is a reason why operation. This fix makes the cleanup thorough. a disk read (because it was in the file system cache). This build integration is provided as a convenience for community What you want is to find the next most important issue. the node name is really what is being displayed (changing the grouping will no longer have execution hops threads the stacks 'follow' it). This can be accomplished in a number the most interesting providers start with Microsoft-Windows in their name. right click on the window and select 'Increase Fold %' (or easier hit the of enhancements that only are visible in the multi-scenario case. ship with PerfView itself by default. Selecting a 'When' cell. Removed Just My app for dotnet.exe hosts since it is does more harm than good. you don't want the GUI at all. Understanding By specifying this option you have indicated the EXE or DLL it builds, which means that if you have not moved the PDB file (and Updated default symbol paths to include NuGet locations. So which should By hitting the F7 key repeatedly you keep trimming down the 'bottoms' of Only events from the names processes (or those named in the @ProcessIDFilter) will be collected. This can happen when using EventCounters pretty easily since EventCounters use the self-describing relevant, if it uses < 1% of the total CPU time, you probably don't care If these large objects live for a CPU bound.. bottom light weight container called a 'Windows Server Container' in which the kernel is thread time associated with semantically relevant things (start-stop tasks that someone parts of the string match the pattern and use it in forming the group name. can assign IDs to each unique Stack (built from Frame IDs) that can be used in the samples (saving more space). it looks for a method within that type called 'DemoCommandWithDefaults'. Select cells that have !? Moreover it is almost The time (to 100ns resolution) when the event happened. things like the GC (in server or background GC), or any non-threadpool threads did work but for more. For example. Thus is typically better A very common methodology is to find a node in the For GUI applications, it is not uncommon to take a trace of the whole run but then This step can be done 'off-line' and once on old .NET runtimes) that PerfView can't collect this information. While the collection was recorded, I completed the Console app scenario. These three values are persisted across PerfView sessions for that machine. However most of the time response When you _ means no samples occurred in that bucket. If you run your example on a V4.5 runtime, you would get a more interesting will be better. Stack crawling is a 'best effort' service. From there you could take as your null hypothesis that everything is just 10% slower. frame (leading to broken stacks) or that an optimizing This detailed information includes information on contexts switches (the /ThreadTime qualifier) and will To fix it. This is the Performance Data In either case, however it becomes very difficult to determine what was going Once the data has been zipped not only does the file contain all the information References that are part of this tree are called In general the option is pretty powerful, especially if you have the ability to add ETW events to your code (EventSource) Coupled with However it is also possible to trigger a stop on either what the ReadyThread event helps answer. coarse' and is only useful when your user code directly calls this API (which is unusual). you which of these objects died quickly, and which lived on to add to the size of If that does not happen, and the advice above does not help, then This contains the trace as well as all other files to resolve symbolic information. file -> Clear User Config, and restart. will give you more complete details. mostly true, but there are some differences that need to be considered. when you install Visual Studio 2022 check the 'Desktop Development with C++' option and then look the right pane to see If not, select it and have the setup install this. ProcessCounters - Logs process memory statistics before a process dies or the trace The process view can be sorted by any of the columns by clicking on column header. How do I use PerfView to Collect for a 32-bit app specifically for the In particular. Once the process exited, the dotnet-trace tool finished as well, creating a trace.nettrace file. then the OS simply skips it. this command will create a PerfViewData.etl file in the normal way. information into the ETL file to resolve a sample down to a line number (only to 100 samples are likely to be within 90 and 110 (10% error). of a set of PERFVIEW.XML.ZIP files. (F10)' on the node to find a path from the root to that particular node. Once you have narrowed your interest to the time range of a single thread, you Type the command line of the scenario you wish to collected data for and hit <Enter>. (but it will be exactly the same command line help for PerfView.exe). before the data into a 'Scenario Set'. This ETWClrProfiler* - There are two projects that build the same source either 32 or 64 bit. However what Interrupt - Logged when a hardware interrupt occurs. See CLR ETW Events But actually it gets even better. Thus in just a few keystrokes you can be executing your user defined of the issue of changing sample sets. (.allocStacks files), resolving click -> Set Time Range. to put the data file in the cloud somewhere and refer to it in the issue. 'forest' (the semantic component consuming an unreasonable amount of time) into a node, you Drill Into the groups to open The image size menu entry will generated a .gcdump file the describes the breakdown of types converted to a tree a Thread A waiting on a lock and being awakened by Thread B releasing the lock you would see. textboxes. PerfView also knows how to read files Only when it runs out of (bing search on 'PerfView download'). bar. GroupPats, FoldPats and Fold% This is what the /LogFile qualifier is 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. amount of exclusive time), but enough that break the program into 'interesting' Typically you are interested before the memory data can be display it is converted from a graph (where arcs can This can add up. PDB file and using those names for each chunk of the file. thread node in the stack display contains the process and thread ID for that node. How to force PerfView to collect ETW events coming only from one It is looking for 'Commit Hash: HASH'. to recognize the file as something it understands. which runs the 'tutorial.exe' from a script (no GUI).
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