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C:\test>215578 -BUFN=16 pipes.dat
1 trial of sysread (160.090s total)
...
1 trial of stdio (324.950s total)

sysread:20000 sysread2:20000 stdio:20000

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#! perl -slw
use strict;
...
1 trial of stdio (324.950s total)

sysread:20000 sysread2:20000 perlio:20000