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Add Integer awareness to RamUsageEstimator.sizeOf (#11715) 

Additionally, update comments to reflect that we have not been VM cache-aware for a long time now.
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Mike Drob 2022-08-25 15:18:08 -05:00 committed by GitHub
parent 1d54299011
commit dbc7a9764a
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2 changed files with 18 additions and 6 deletions
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2
lucene/CHANGES.txt
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@ -97,6 +97,8 @@ Improvements
---------------------
* LUCENE-10592: Build HNSW Graph on indexing. (Mayya Sharipova, Adrien Grand, Julie Tibshirani)
* GITHUB#11715: Add Integer awareness to RamUsageEstimator.sizeOf (Mike Drob)
Optimizations
---------------------

20
lucene/core/src/java/org/apache/lucene/util/RamUsageEstimator.java
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@ -107,8 +107,7 @@ public final class RamUsageEstimator {
primitiveSizes = Collections.unmodifiableMap(primitiveSizesMap);
}
/** JVMs typically cache small longs. This tries to find out what the range is. */
static final int LONG_SIZE, STRING_SIZE;
static final int INTEGER_SIZE, LONG_SIZE, STRING_SIZE;
/** For testing only */
static final boolean JVM_IS_HOTSPOT_64BIT;
@ -187,6 +186,7 @@ public final class RamUsageEstimator {
NUM_BYTES_ARRAY_HEADER = NUM_BYTES_OBJECT_HEADER + Integer.BYTES;
}
INTEGER_SIZE = (int) shallowSizeOfInstance(Integer.class);
LONG_SIZE = (int) shallowSizeOfInstance(Long.class);
STRING_SIZE = (int) shallowSizeOfInstance(String.class);
}
@ -208,10 +208,18 @@ public final class RamUsageEstimator {
}
/**
* Return the size of the provided {@link Long} object, returning 0 if it is cached by the JVM and
* its shallow size otherwise.
* Return the shallow size of the provided {@link Integer} object. Ignores the possibility that
* this object is part of the VM IntegerCache
*/
public static long sizeOf(Long value) {
public static long sizeOf(Integer ignored) {
return INTEGER_SIZE;
}
/**
* Return the shallow size of the provided {@link Long} object. Ignores the possibility that this
* object is part of the VM LongCache
*/
public static long sizeOf(Long ignored) {
return LONG_SIZE;
}
@ -456,6 +464,8 @@ public final class RamUsageEstimator {
size = sizeOf((float[]) o);
} else if (o instanceof int[]) {
size = sizeOf((int[]) o);
} else if (o instanceof Integer) {
size = sizeOf((Integer) o);
} else if (o instanceof Long) {
size = sizeOf((Long) o);
} else if (o instanceof long[]) {