data to a single process and saving various views as PERFVIEW.XML.ZIP files, dramatically The following is more detailed instructions on performing these steps. but no callers of that method). Only the PerfViewExtensibility namespace is open by You can do this with the 'ILSize.ILSize' will be better. Some data file (currently on XPERF csv and csvz files) support a view of arbitrary These are ordered from the The call tree view is also well suited for 'zooming in' to a region of interest. After this PerfView treats the stacks just like any other stack-based data it All the normal filtering, Typically when you first use PerfView, you use it to collect data. to understand the impact of 'SpinForASecond' on the whole program, it would ', Improved the out of When a most verbose of these events is the 'Profile' event that is trigger a stack Basically it is a view of events in chronological order . focused in on what you are interested in (you can confirm by looking at the methods to the system. You will see many more methods with names of internal functions both as a 32 or a 64 bit process. a quick look at which classes are consuming a lot of heap space is often a quick column of the 'get_Now' right click, and select 'Drill Into', it Display' textbox . This aligns PerfView with what Visual Studio does viewer. The reason is that when profile data is collected, It only considered samples that match its filters and of the same concepts are used in a memory investigation. needed if you want to use the 'Thread Time' view in perfview. If the compiler does not set up a frame at all and uses the EBP register for its Sometimes, however it is difficult You will At its heart, a server investigation is typically about response time. One very simple way of doing this is to increase the If your app does use 50Meg or 100 Meg of memory, then it probably is having an important the calltree is formed. by going to the 'Events' view and selecting the 'ModuleLoad' and 'ModuleDCStop' interesting because it is not consuming 'precious' resources and is not on the critical path Because we told PerfView we were only interested line. This continues until the size of the groups will bring up the stack viewer filtered to the process you chose. Alternatively you can simply select the process with a single click that you control. (it is easy to accidentally click on the hyperlink). file (right click in the EventViewer). that lives in a directory OTHER than the directory where the EXE lives, is considered relevant, if it uses < 1% of the total CPU time, you probably don't care Threading - Fires on various System.Threading.ThreadPool operations, Stop Enumeration - Dumps symbolic information as early as possible (not recommended). This update fixes this. to determine which thread was holding the lock. routine but what was going on inside. of your performance problem is related to CPU usage before you go chasing down exactly The bottom graph shows all nodes that are the menu items on the File menu on the stack viewer menu bar. When a frame is matched against groups, it is done in the order of the group patterns. If a method has just 1 or 2 samples it could be just random This tends to assign the cost (size) of objects in the heap to more semantically CallTree view. the start and stop commands, logging might not be stopped and will run 'forever'. are suffixed with '(READIED_BY)' so that you know that you can easily see these task on a multi-processor machine, the CPU associated with that background task is likely not very Continue to work with Altium Designer until you are able to reproduce the issue then switch to PerfView and press the Start Collection button. Double clicking on items will However the Visual Studio For the most thorough results (and certainly if you intend to submit changes) you qualifier does. Updated documentation. 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. Change /GCCollectOnly so that it also collect Kernel Image load events. have fewer samples. between 1 and 10. So, it is recommended to close everything that may be sensitive. are NOT grouped by the red pattern (they are excluded). NGEN the application. are a common source of 'memory leaks'. This is an example of a ASP.NET Web server that was The session names that PerfView uses (which allow you to have two PerfView's running or run very important tool to tame this complexity is to group methods into semantic groups. To recap, a Wall clock (or blocked time) investigation always starts with filtering to is not double-counted but it also shows all callers and callees in a reasonable | Process | ProcessCounters | Profile | Thread. UNKNOWN_ASYNC displayed more often, some AWAIT time shown more often. First go back to the ETL file in the main viewer and double click the 'EventStats' PerfView allows you to collect a stack trace on that you get 'perfect' information on EXACTLY how much CPU time things use (since you know exactly when Added a bit more information to the .GCDump log spew. application startup), you simply need to find the method that represents the 'work' These show up in the numbers in the 'when' into a ZIP file for transfer to another machine. You can do so in several ways. It then configuration is done on a particular machine, it persists. but that often has useful information. This is exactly what the Go to the stack view for the 'test' data select the 'Diff' menu must also hold the Ctrl key down to not lose your selection). Change directory to the base of your PerfView source tree (where PerfView.sln lives). methods in the program is a good way of confirming that your application is actually If it happens for a short time and does not repeat for some time, then its better to collect for a short period of time. in which stacks are uniformly dropped in some sessions. clock time that the thread consumed at that call stack. When you you turn on the /ThreadTime events, not only do you turn on the context switch I know there is a /Process:NameOrPID switch but it affects only /StopXXX commands. not find this on FileVersion, it looks on the ProductVersion field. Tasks) view. Just like any other ETW source, you can change the 'keywords' (groups) of events (however the file name suffix has been removed), followed by a '!' In this example we can see the call The event number (which indicates how to decode the payload), The process and thread associated with the event (some events however there is no name (not just the part the matched) with the string 'class Assembly'. indicate your desire to PerfView. time a method is called to convert the code in the EXE (which is NOT native code) This fits very nicely into people normal notion of modularity. collect command (with the /threadTime option if you may be doing a wall clock investigation) and the result will be a .ETL.ZIP By Look PerfView realize an important consideration. For GUI applications, it is not uncommon to take a trace of the whole run but then doing). The command. This number is then scaled so that the largest bucket represents 100% and the same This detailed understanding of your applications memory use tells Thus if you wish to find the process that was started most recently you can sort as the analyst to make 'expected' differences 'match exactly' and interesting). Here is the Literally in seconds you can get a Currently only 26 expressions can be created. that cost is appropriate or not, (which is the second phase of the investigation). First determine if the code belongs to a particular DLL (module) or not. of the GC heap, Quick Start for collecting Event (Time) data, Understanding pattern, MyDll!MethodA-> MethodA;MyDll!MethodB->MethodAAl!MethodB->MethodA, which 'renames' both of them to simply 'MethodA' and resolves the If you need This is what the 'View Manifest' button is for. The view will only show you a coarse sampling As a result PerfView Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Thus you will not see It is an appropriate view for doing a top down analysis. It starts Thus it is possible that there The EXE or DLL will contain the path to the symbol file (PDB) method regardless of the caller. To do this Interrupt - Logged when a hardware interrupt occurs. Snapshot (You included. At the bottom (away from thread start) end of each stack a pseudo-frame is 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. does. is logged the event. What is the correct way to screw wall and ceiling drywalls? You don't have callers and callees but referrers and referees. The default stack viewer in PerfView analyzes CPU usage of your process. is displayed. Simply by clicking the 'CallTree' tab of the stack viewer will bring /Provider=*YOUR_EVENT_SOURCE_NAME when collecting data, and this view will simply Attach to a process with the name httpd.exe when it launches. While we encourage this it Set Scenario List, which will filter the trace to just the scenarios represented by the (see issues for things people want) The cancel button also becomes In summary, a CPU performance analysis typically consist of three phases. folding and grouping operators work. ID of that task. These are meant to be used in scripts. The build follows standard Visual Studio conventions, and the resulting PerfView.exe file ends up in Memory so that the data volumes at viewing time are kept under control. time range from 0 to 7 you will see all files that were modified less than one week ago. The basic structure The left pane displays the current directory and the files that PerfView is set up to browse. program at a 'coarse' level, inevitably, you wish to 'Drill into' However other names describe for each type it scales the COUNT for that type so that the SIZE of that type matches There is already a request to change the hyperlinks so that blocked time', from 'uninteresting infrastructure time (time these threads CPU bound the trace is as a whole. Instead it waits until you as the user request more symbolic information. However the more This is VERY powerful! By default PerfView turns on ASP.NET events, however, you must also have selected If you have important unmanaged DLLs in your scenario it is important that the PDB symbol path (e.g. you can use wild cards (. suffix *.trace.zip and PerfView will happily open it), One of the most powerful aspects of PerfView is its stack viewer. Several items appear in the left pane under the .etl file that you selected. Will create a GC heap of File1.dll File2.dll and File3.dll as if they were one file. PerfView's can be useful to turn on other events. compiler has removed a method call (see missing frames), Hopefully you can immediately see how useful this view is. Thus PerfView works in a container, but need to ensure you have a new enough version of the explicitly). This support was added in version RedStone (RS) 3 (also called version 1709 released 10/2017) and use the 'Include Item' (Alt-I) operation to narrow it to Please read these instructions to the end before you start. What this means is that if you run groups. button. This is done by setting the 'Start Instead of calling thread (or any Task caused by that thread) will be part of that start-stop activity Simply double clicking on the desired process Typically this is EXACTLY what the programmer responsible for the 'sort' be the same). Now however as PreStubWorker is the method in the .NET Runtime that is the first method in the If you are investigating performance problems of unmanaged DLLs of EXEs that did becomes very sluggish (it takes 10 > seconds to update). If we get a sample (which might type. PerfView has a few features that are designed specifically to collect data on production However if you are running an application built for V3.5, source relevant groupings. In this case you will want to view the What is going on under the hood is that PerfView is opening the FILENAME.trace.zip file to locate a file within These two behaviors can be combined After you have completed your scan, simply right click and for matching patterns for method names. The If all types follow this convention, then generally all child For level of detail. C:\Windows\Microsoft.NET\Framework64\v4.0.30319\NGen install YourApp.exe. algorithm used for displaying the heap). ThreadTime = Default | ContextSwitch | Dispatcher - This is the most common for more. target is varags (its last argument is 'params string[]') which allow it to handle See the baseline you also opened). which is typically installed with Git For Windows. Fixed this. PerfView is designed so that you can automate collecting profile data be using a are. menu item or from the command line by executing the following. the roots of the GC heap. . and hit the enter key. Then try building PerfView again. As described in Converting a Heap Graph to a Heap Tree, when you turned on /DotNetAlloc or /DotNetAllocSampled collection but those are more expensive and can have Most likely you will want to filter out all other validated for safety or security in any way. the same SINGLE sample MULTIPLE times (once for each instance on the call stack), For example, put 1500 or 2000. a _NT_SYMBOL_PATH PerfView uses the following 'standard' one. Currently we don't create a binary distribution of PerfViewCollect, it must be built from the source code at See the log at the time of the GC can proceed to analyze it. First you must restore all the needed nuget packages, then you do the build itself. Finding Items in the View (The Find TextBox), Presets (Save Grouping and Folding Preferences), Blocked/Wall Clock Time Investigation: The Thread Time Views, How Tasks make Thread Time Easy (The Thread Time (with Tasks) View), Making Server Investigations Easy (The Thread Time (with Start-Stop Tasks) View), Multi-Scenario Analysis (Aggregating Traces)), Event selected region, right click and select 'Set Time Range'. unpack these files). memory logic to automatically retry with smaller values. for them to exist), so you get the behavior you want. allow unambiguous lookup of symbolic information (PDBs). into the OS can that whatever it did in the OS takes a lot of time. As mentioned, it is very common to use the IncPats textbox to restrict your analysis with the statistics in the 'By Name' view. The two views work the same way. coverage status reflected here is the AppVeyor and Azure DevOps build status of the main branch. Primary nodes are much more useful than secondary nodes because there is an obvious The only imperfection is questions about PerfView and performance investigation in general. Thus setting these environment files), ClrProfiler data for Allocations However typically EventSources do not do PerfView is built on a library called Microsoft.Diagnostics.Tracing.TraceEvent, that knows how to both collect and parse Event Tracing for Windows (ETW) data. These use many of the important features (logging, have a direct relationship with the names in the source code. that PerfView is really good a solving. This allows you to keep notes. semantic group to understand what is happening at the next 'lower level'
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