Why GNU coreutils/dd is creating a dummy file more efficiently than D's For loop?
BoQsc
vaidas.boqsc at gmail.com
Thu May 23 09:09:05 UTC 2019
This code of D creates a dummy 47,6 MB text file filled with Nul
characters in about 9 seconds
import std.stdio, std.process;
void main() {
writeln("Creating a dummy file");
File file = File("test.txt", "w");
for (int i = 0; i < 50000000; i++)
{
file.write("\x00");
}
file.close();
}
While GNU coreutils dd can create 500mb dummy Nul file in a
second.
https://github.com/coreutils/coreutils/blob/master/src/dd.c
What are the explanations for this?
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