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Code Releases Activity

Limit HashLookup slot size with 4 or 8 bytes, back

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This commit is contained in:
leventov
2015-09-22 23:07:54 +03:00
parent d9c771bedc
commit b113118707
5 changed files with 158 additions and 46 deletions
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src/main/java/net/openhft/chronicle/map/ChronicleMapBuilder.java
+5 -7
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@@ -877,8 +877,8 @@ public final class ChronicleMapBuilder<K, V> implements
if (entriesPerSegment > 0) {
return (int) segmentsGivenEntriesPerSegmentFixed(entriesPerSegment, replicated);
}
// iteratively try to fit 3..8 bytes per hash lookup slot. Trying to apply small slot
// sizes (=> segment sizes, because slot size depends on segment size) not only because
// Try to fit 4 bytes per hash lookup slot, then 8. Trying to apply small slot
// size (=> segment size, because slot size depends on segment size) not only because
// they take less memory per entry (if entries are of KBs or MBs, it doesn't matter), but
// also because if segment size is small, slot and free list are likely to lie on a single
// memory page, reducing number of memory pages to update, if Chronicle Map is persisted.
@@ -898,11 +898,9 @@ public final class ChronicleMapBuilder<K, V> implements
// each segment. To compensate this at least on linux, don't accept segment sizes that with
// the given entry sizes, lead to too small total segment sizes in native memory pages,
// see comment in tryHashLookupSlotSize()
for (int hashLookupSlotSize = 3; hashLookupSlotSize <= 7; hashLookupSlotSize++) {
long segments = tryHashLookupSlotSize(hashLookupSlotSize, replicated);
if (segments > 0)
return (int) segments;
}
long segments = tryHashLookupSlotSize(4, replicated);
if (segments > 0)
return (int) segments;
long maxEntriesPerSegment = findMaxEntriesPerSegmentToFitHashLookupSlotSize(8, replicated);
long maxSegments = trySegments(maxEntriesPerSegment, MAX_SEGMENTS, replicated);
if (maxSegments > 0L)