Fix random failure on getusage-missing environments
* 1e6 makes a spurious result about floating point number's precision.
* 1e6
irb(main)[01:0]> 16.028 => 16.028 irb(main)[02:0]> (16.028 * 1e6) => 16027999.999999998
Fix random failure on getusage-missing environments
* 1e6
makes a spurious result about floating point number's precision.