Mercurial CLI is slow in C#?
- by pATCheS
I'm writing a utility in C# that will make managing multiple Mercurial repositories easier for the way my team is using it. However, it seems that there is always about a 300 to 400 millisecond delay before I get anything back from hg.exe. I'm using the code below to run hg.exe and hgtk.exe (TortoiseHg's GUI). The code currently includes a Stopwatch and some variables for timing purposes. The delay is roughly the same on multiple runs within the same session. I have also tried specifying the exact path of hg.exe, and got the same result.
static string RunCommand(string executable, string path, string arguments)
{
var psi = new ProcessStartInfo()
{
FileName = executable,
Arguments = arguments,
WorkingDirectory = path,
UseShellExecute = false,
RedirectStandardError = true,
RedirectStandardInput = true,
RedirectStandardOutput = true,
WindowStyle = ProcessWindowStyle.Maximized,
CreateNoWindow = true
};
var sbOut = new StringBuilder();
var sbErr = new StringBuilder();
var sw = new Stopwatch();
sw.Start();
var process = Process.Start(psi);
TimeSpan firstRead = TimeSpan.Zero;
process.OutputDataReceived += (s, e) =>
{
if (firstRead == TimeSpan.Zero)
{
firstRead = sw.Elapsed;
}
sbOut.Append(e.Data);
};
process.ErrorDataReceived += (s, e) => sbErr.Append(e.Data);
process.BeginOutputReadLine();
process.BeginErrorReadLine();
var eventsStarted = sw.Elapsed;
process.WaitForExit();
var processExited = sw.Elapsed;
sw.Reset();
if (process.ExitCode != 0 || sbErr.Length > 0)
{
Error.Mercurial(process.ExitCode, sbOut.ToString(), sbErr.ToString());
}
return sbOut.ToString();
}
Any ideas on how I can speed things up? As it is, I'm going to have to do a lot of caching in addition to threading to keep the UI snappy.
