- Hard disk serial number changer github for free#
- Hard disk serial number changer github full#
- Hard disk serial number changer github software#
- Hard disk serial number changer github code#
We write to the OS write cache instead of the disk. Based on actual data we need to revise our mental performance model: Why are we not writing to the SSD? The answer is: The Operating System is collecting a bunch of writes and later flushes data to disk when there is time or the amount of written data exceeds some internal threshold. Our process FileWriter writes 500 MB of data, but there are only 4 MB written in 53ms (Disk Service Time). In the middle we see System (lila = Windows OS) doing strange things (Antivirus again?).ĭo you remember that our SSD can write 430 MB/s? The Disk Usage view in WPA shows disk writes. We see that FileWriter (green) starts off good but then MsMpEng.exe (red = Defender Antivirus) is kicking in and probably delaying our File IO significantly. But since Concurrency Visualizer uses ETW there is nothing that can stop us to open the Concurrency Visualizer generated ETW files from the folder C:\Users\\Documents\Visual Studio 2022\ConcurrencyVisualizer\ with WPA. Personally I find it difficult to work with this view, when other processes are consuming the majority of CPU.
Hard disk serial number changer github full#
NET 6.0 symbols could not be resolved but it might also be just a problem with my symbol lookup (there should be a full stack trace visible). The Threads view shows where the Main Thread is blocked due to IO/Waiting/… You can click with the mouse on the timeline of any thread to get in the lower view the corresponding stack trace. The first observation is that once we start writing files other processes become very busy which looks correlated. Green is our profiled process FileWriter.exe.
White is free CPU, dark gray is System and light gray are all other processes. In our case other processes were consuming a lot of CPU while we were running. In the Utilization tab we get a nice summary of CPU consumption of the machine. We try to stay simple and start FileWriter with the single threaded strategy which is easiest to analyze FileWriter -generate c:\temp serial
Hard disk serial number changer github for free#
Luckily there is the Concurrency Visualizer extension for free on the Visual Studio Marketplace, which can also show Thread blocking times.Īfter installation you can start your project from the Analyze menu with your current debugging settings. But why? Drilling deeper will help to some extent, but we do not see where it did wait for disk writes because the CPU Profiler is only showing CPU consumption. Where did we loose performance? We can try out the Visual Studio CPU Profiler: That shows that creating and writing to the file are the most expensive parts. This is off nearly by a factor 10 what the SSD is able to deliver. My mental performance model is that we should be able to max out a SATA SSD which can write 430 MB/s. We write 500 MB with the parallel version in 11s. That was easy.īut, as you can imagine there is always a but: Are the numbers we have measured reasonable? Lets do some math.
Based on real world measurements we have found that 3 threads is the fastest solution. The fastest one is the one which uses 3 threads. Lets measure how long it takes: As expected the serial version is slowest and the parallel versions are faster.
Hard disk serial number changer github code#
The code is located at, but the exact details are not important. It creates a n files and writes in each file a string until the file size is reached. How do you decide which strategy is the most efficient and/or fastest one? As strategies we have I have created a C# console project named FileWriter which writes 5000 100KB files (= 500MB) to a folder with different strategies.
Hard disk serial number changer github software#
Everyone writes tests for their software because they have proven to be useful, but why are so few people profiling their own code? Is it too difficult? The first one should be avoided, the second is a MSR paper dealing with performance modelling techniques. PDD can mean Panic Driven, or Performance Driven Development. There are many extreme software development strategies out there.