Differential D24538

[Database] Disable read-ahead to prevent thrashing
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Authored by hurikhan77 on Oct 10 2019, 5:32 PM.

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ngraham
Summary

Prevent filesystem thrashing in low-mem situations by turning off
read-ahead. Access patterns of baloo are unlikely to benefit from
read-ahead and preserving cache is more valuable than reading ahead
potentially unused data.

In low-memory conditions, the random access patterns of Baloo combined
with read-ahead tend to dominate the cache. Let Baloo be the slow player
here, and leave system cache and memory for interactive performance.

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R293 Baloo
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hurikhan77 created this revision.Oct 10 2019, 5:32 PM
Restricted Application added a project: Frameworks. · View Herald TranscriptOct 10 2019, 5:32 PM
Restricted Application added subscribers: Baloo, kde-frameworks-devel. · View Herald Transcript
hurikhan77 requested review of this revision.Oct 10 2019, 5:32 PM
hurikhan77 updated this revision to Diff 67627.Oct 10 2019, 5:35 PM
hurikhan77 retitled this revision from [Database] Rework handling environment flags to [Database] Disable read-ahead to prevent thrashing.
hurikhan77 edited the summary of this revision. (Show Details)

Prevent filesystem thrashing in low-mem situations by turning off
read-ahead. Access patterns of baloo are unlikely to benefit from
read-ahead and preserving cache is more valuable than reading ahead
potentially unused data.

In low-memory conditions, the random access patterns of Baloo combined
with read-ahead tend to dominate the cache. Let Baloo be the slow player
here, and leave system cache and memory for interactive performance.

hurikhan77 abandoned this revision.Oct 10 2019, 5:38 PM

My submission didn't work as expected...

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Msrc/engine/database.cpp (2 lines)

Diff 67627

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src/engine/database.cpp

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