Just for the sake of experimenting, you could try a sysread instead of the <> operator, and grab 1 byte at a time. 
  while (my $nread = sysread($JSREAD, my $buf, 1)) {
        print  $buf; 
       last if $nread == 0;
        }

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In reply to Re: Diagnosing blocking io (or: finding the WHY of my Open2 woes). by zentara
in thread Diagnosing blocking io (or: finding the WHY of my Open2 woes). by Socrates

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