Re: Faster ways to redirect stdout of child process to file

[Thomas Mader via Digitalmars-d-learn]

I found out that the redirect was not responsible for the CPU 
time, it was some other code part which was responsible for it 
and totally unrelated to the redirect.


I also saw that a redirect in my case is much simpler by using 
spawnProcess:


auto logFile = File(errors.log, w);
auto pid = spawnProcess([dmd, myprog.d],
std.stdio.stdin,
std.stdio.stdout,
logFile);

Faster ways to redirect stdout of child process to file

[Thomas Mader via Digitalmars-d-learn]

I use

auto pipes = pipeProcess( cmd, Redirect.stdout | 
Redirect.stderr );


to redirect stdout of the newly created subprocess via pipes to a 
file. The redirect itself happens in a newly created thread 
(because I need to wait for the subprocess to finish to take the 
exact elapsed time) doing basically:


pipes.stdout.byChunk( 1024 * 1024 ).copy( 
cof.lockingTextWriter() );


This happens to use much of my CPU time (~25%). I wonder if there 
is no faster way to do this.

I use this method because I want to be platform independent.

Thomas