Joe McDonnell created IMPALA-15585:
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Summary: OsInfo does not understand that ARM's CLOCK_MONOTONIC is
fast
Key: IMPALA-15585
URL: https://issues.apache.org/jira/browse/IMPALA-15585
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 5.0.0
Reporter: Joe McDonnell
OsInfo::Init() has logic to detect whether the clock_gettime has a fast
CLOCK_MONOTONIC implementation. If it does not detect a fast implementation, it
uses CLOCK_MONOTONIC_COARSE, which has significantly lower resolution. This is
to protect against old clock implementations that are very slow (see
IMPALA-2407). ARM has a high precision clocksource with equivalent speed to
x86_64 for CLOCK_MONOTONIC, but it has a different name in the clocksource
file. The algorithm doesn't detect it and uses the coarse timer. This makes
time counters in ARM profiles much less useful.
We should update the detection to properly detect this on ARM.
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