Avoid creating external processes to read OS version info #1240
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Since .NET 5 we can now use the `Environment.OSVersion` property to lookup the real OS version for macOS and Windows[1]. For .NET Framework (still used for our releases on Windows) we must continue to use the Win32 API `RtlGetVersion` to avoid any Windows compatibility nonsense. We continue to use `uname` on Linux. [1] https://learn.microsoft.com/en-us/dotnet/core/compatibility/core-libraries/5.0/environment-osversion-returns-correct-version
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ldennington
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May 4, 2023
| return swvers.StandardOutput.ReadToEnd().Trim(); | ||
| } | ||
| } | ||
| return Environment.OSVersion.VersionString; |
Try using the /etc/os-release file, for systemd distros, in favour of calling out to `uname` which can add extra overhead in the form of process startup. Direct file I/O and parsing should be faster.
vdye
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**Changes:** - Use in-proc methods for getting OS version number (#1240, #1264) - Update System.CommandLine (#1265) - Suppress GUI from command-line argument (#1267) - Add github (login|logout|list) commands (#1267) - cURL Cookie file support (#1251) - Update target framework on Mac/Linux to .NET 7 (#1274, #1282) - Replace JSON.NET with System.Text.Json (#1274) - Preserve exact redirect URI formatting in OAuth requests (#1281) - Use IP localhost redirect for GitHub (#1286) - Use WWW-Authenticate headers from Git for Azure Repos authority (#1288) - Better GitHub Enterprise Managed User (EMU) account support (#1190)
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We are spending about 45ms on macOS to read version information by shelling out to
sw_verson each run of GCM.Let's try and be smarter and use BCL APIs, system APIs or file-based sources for the OS and distribution information before resorting to external processes.
In my testing, on macOS, we went from 45ms to 4.5ms (10x speedup).
Note that we are now also getting something a little bit more useful for Linux:
Before:
After: