belliottsmith commented on code in PR #4220:
URL: https://github.com/apache/cassandra/pull/4220#discussion_r2218882618
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test/simulator/main/org/apache/cassandra/simulator/systems/SimulatedTime.java:
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@@ -274,7 +274,7 @@ public long nanoTime()
nextDrift = nanosDriftSupplier.get(random);
from = global;
to = global + Math.max(baseDrift, nextDrift);
- diffPerGlobal = (nextDrift - baseDrift) / (double)(to - from);
+ diffPerGlobal = to == from ? 1 : (nextDrift - baseDrift) /
(double)(to - from);
Review Comment:
I think it is to ensure monotonicity when the drift is changed, since we use
this clock for both monotonic and non-monotonic timestamps. That is, we apply
the new drift as of some future time, and we smear the change in drift over the
time period.
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