Michael Dürig created OAK-5859:
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Summary: Analyse and reduce IO amplification by OS
Key: OAK-5859
URL: https://issues.apache.org/jira/browse/OAK-5859
Project: Jackrabbit Oak
Issue Type: Task
Components: segment-tar
Reporter: Michael Dürig
Certain operation system settings might result in too much data actually being
read from disk causing early setting on of thrashing. E.g. transparent huge
pages or too big read aheads might be contra productive in combination with the
TarMKs memory mapping model.
* Determine the ratio of data being read by the TarMK and actual data being
read from disk. Determine the impact of relevant OS parameters (e.g.
transparent huge pages) on this ratio.
* Compare memory mapped mode with file IO mode with an accordingly increased
segment cache. This would move prediction of what is likely to be read next
from the OS layer into our segment cache eviction strategy.
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