• Thomas Mader (13/13) Aug 11 2014 I use
• Thomas Mader (10/10) Aug 15 2014 I found out that the redirect was not responsible for the CPU

"Thomas Mader" <thomas.mader gmail.com> writes:

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

"Thomas Mader" <thomas.mader gmail.com> writes:

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);