fix >5s quick mode crash, resolve #658 #685
Merged
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When using quick mode without "--noplot", any benchmark running over 5 seconds will lead to a crash. This commit fixes this problem by adding a very small amount (currently 0.000001) to the second of the two elapsed times (that will not be reported due to rounding) in order to work around the gnuplot crash. See #658.
The issue occurred because of the original workaround which passes a single measurement twice to get a valid vector with two elements as an early exit for long running benchmarks.