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Java examples for Oracle NoSQL Database
/*-
* Copyright (c) 2011, 2020 Oracle and/or its affiliates. All rights reserved.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* https://oss.oracle.com/licenses/upl/
*/
package oracle.nosql.driver.util;
import java.lang.management.ManagementFactory;
import java.util.List;
/**
* This class is used to implement a sizeof() method on FieldValueImpl. The
* code here is copied from je/dbi/MemoryBugdet.java. See there for details.
*/
public class SizeOf {
public final static int OBJECT_REF_OVERHEAD_32 = 4;
public final static int OBJECT_REF_OVERHEAD_64 = 8;
public final static int OBJECT_REF_OVERHEAD_OOPS = 4;
// 2
public final static int OBJECT_OVERHEAD_32 = 8;
public final static int OBJECT_OVERHEAD_64 = 16;
public final static int OBJECT_OVERHEAD_OOPS = 16;
// 8
public final static int ARRAY_OVERHEAD_32 = 16;
public final static int ARRAY_OVERHEAD_64 = 24;
public final static int ARRAY_OVERHEAD_OOPS = 16;
// see byteArraySize
public final static int ARRAY_SIZE_INCLUDED_32 = 4;
public final static int ARRAY_SIZE_INCLUDED_64 = 0;
public final static int ARRAY_SIZE_INCLUDED_OOPS = 0;
// 20
public final static int HASHMAP_OVERHEAD_32 = 120;
public final static int HASHMAP_OVERHEAD_64 = 219;
public final static int HASHMAP_OVERHEAD_OOPS = 128;
// 21 - OBJECT_OVERHEAD - HASHMAP_OVERHEAD
// 32b: 21 is 152
// 64b: 21 is max(280,...,287) on Linux/Solaris 1.5/1.6
// Oops: 21 is 176
public final static int HASHMAP_ENTRY_OVERHEAD_32 = 24;
public final static int HASHMAP_ENTRY_OVERHEAD_64 = 52;
public final static int HASHMAP_ENTRY_OVERHEAD_OOPS = 32;
// 22
public final static int HASHSET_OVERHEAD_32 = 136;
public final static int HASHSET_OVERHEAD_64 = 240;
public final static int HASHSET_OVERHEAD_OOPS = 144;
// 23 - OBJECT_OVERHEAD - HASHSET_OVERHEAD
// 32b: 23 is 168
// 64b: 23 is max(304,...,311) on Linux/Solaris
// Oops: 23 is 192
public final static int HASHSET_ENTRY_OVERHEAD_32 = 24;
public final static int HASHSET_ENTRY_OVERHEAD_64 = 55;
public final static int HASHSET_ENTRY_OVERHEAD_OOPS = 32;
// 34
public final static int TREEMAP_OVERHEAD_32 = 48;
public final static int TREEMAP_OVERHEAD_64 = 80;
public final static int TREEMAP_OVERHEAD_OOPS = 48;
// 35 - OBJECT_OVERHEAD - TREEMAP_OVERHEAD
// 32b: 35 is 88
// 64b: 35 is 160
// Oops: 35 is 104
public final static int TREEMAP_ENTRY_OVERHEAD_32 = 32;
public final static int TREEMAP_ENTRY_OVERHEAD_64 = 64;
public final static int TREEMAP_ENTRY_OVERHEAD_OOPS = 40;
// 27 minus zero length Object array
public final static int EMPTY_OBJ_ARRAY = objectArraySize(0);
public final static int ARRAYLIST_OVERHEAD_32 = 40 - EMPTY_OBJ_ARRAY;
public final static int ARRAYLIST_OVERHEAD_64 = 64 - EMPTY_OBJ_ARRAY;
public final static int ARRAYLIST_OVERHEAD_OOPS = 40 - EMPTY_OBJ_ARRAY;
public final static int OBJECT_REF_OVERHEAD;
public final static int OBJECT_OVERHEAD;
public final static int ARRAY_OVERHEAD;
public final static int ARRAY_SIZE_INCLUDED;
public final static int HASHMAP_OVERHEAD;
public final static int HASHMAP_ENTRY_OVERHEAD;
public final static int HASHSET_OVERHEAD;
public final static int HASHSET_ENTRY_OVERHEAD;
public final static int TREEMAP_OVERHEAD;
public final static int TREEMAP_ENTRY_OVERHEAD;
public final static int ARRAYLIST_OVERHEAD;
/* Primitive long array item size is the same on all platforms. */
public final static int PRIMITIVE_LONG_ARRAY_ITEM_OVERHEAD = 8;
private final static String JVM_ARCH_PROPERTY = "sun.arch.data.model";
private final static String FORCE_JVM_ARCH = "je.forceJVMArch";
private static boolean COMPRESSED_OOPS_REQUESTED = false;
private static boolean COMPRESSED_OOPS_KNOWN = false;
private static boolean COMPRESSED_OOPS_KNOWN_ON = false;
static {
boolean is64 = false;
String overrideArch = System.getProperty(FORCE_JVM_ARCH);
try {
if (overrideArch == null) {
String arch = System.getProperty(JVM_ARCH_PROPERTY);
if (arch != null) {
is64 = Integer.parseInt(arch) == 64;
}
} else {
is64 = Integer.parseInt(overrideArch) == 64;
}
} catch (NumberFormatException NFE) {
NFE.printStackTrace(System.err);
}
final Boolean checkCompressedOops = true;
//CompressedOopsDetector.isEnabled(); TODO
if (checkCompressedOops != null) {
COMPRESSED_OOPS_KNOWN = true;
COMPRESSED_OOPS_KNOWN_ON = checkCompressedOops;
}
List args =
ManagementFactory.getRuntimeMXBean().getInputArguments();
for (String arg : args) {
if ("-XX:+UseCompressedOops".equals(arg)) {
COMPRESSED_OOPS_REQUESTED = true;
break;
}
}
final boolean useCompressedOops = (COMPRESSED_OOPS_KNOWN ?
COMPRESSED_OOPS_KNOWN_ON :
COMPRESSED_OOPS_REQUESTED);
if (useCompressedOops) {
OBJECT_REF_OVERHEAD = OBJECT_REF_OVERHEAD_OOPS;
OBJECT_OVERHEAD = OBJECT_OVERHEAD_OOPS;
ARRAY_OVERHEAD = ARRAY_OVERHEAD_OOPS;
ARRAY_SIZE_INCLUDED = ARRAY_SIZE_INCLUDED_OOPS;
HASHMAP_OVERHEAD = HASHMAP_OVERHEAD_OOPS;
HASHMAP_ENTRY_OVERHEAD = HASHMAP_ENTRY_OVERHEAD_OOPS;
HASHSET_OVERHEAD = HASHSET_OVERHEAD_OOPS;
HASHSET_ENTRY_OVERHEAD = HASHSET_ENTRY_OVERHEAD_OOPS;
TREEMAP_OVERHEAD = TREEMAP_OVERHEAD_OOPS;
TREEMAP_ENTRY_OVERHEAD = TREEMAP_ENTRY_OVERHEAD_OOPS;
ARRAYLIST_OVERHEAD = ARRAYLIST_OVERHEAD_OOPS;
} else if (is64) {
OBJECT_REF_OVERHEAD = OBJECT_REF_OVERHEAD_64;
OBJECT_OVERHEAD = OBJECT_OVERHEAD_64;
ARRAY_OVERHEAD = ARRAY_OVERHEAD_64;
ARRAY_SIZE_INCLUDED = ARRAY_SIZE_INCLUDED_64;
HASHMAP_OVERHEAD = HASHMAP_OVERHEAD_64;
HASHMAP_ENTRY_OVERHEAD = HASHMAP_ENTRY_OVERHEAD_64;
HASHSET_OVERHEAD = HASHSET_OVERHEAD_64;
HASHSET_ENTRY_OVERHEAD = HASHSET_ENTRY_OVERHEAD_64;
TREEMAP_OVERHEAD = TREEMAP_OVERHEAD_64;
TREEMAP_ENTRY_OVERHEAD = TREEMAP_ENTRY_OVERHEAD_64;
ARRAYLIST_OVERHEAD = ARRAYLIST_OVERHEAD_64;
} else {
OBJECT_REF_OVERHEAD = OBJECT_REF_OVERHEAD_32;
OBJECT_OVERHEAD = OBJECT_OVERHEAD_32;
ARRAY_OVERHEAD = ARRAY_OVERHEAD_32;
ARRAY_SIZE_INCLUDED = ARRAY_SIZE_INCLUDED_32;
HASHMAP_OVERHEAD = HASHMAP_OVERHEAD_32;
HASHMAP_ENTRY_OVERHEAD = HASHMAP_ENTRY_OVERHEAD_32;
HASHSET_OVERHEAD = HASHSET_OVERHEAD_32;
HASHSET_ENTRY_OVERHEAD = HASHSET_ENTRY_OVERHEAD_32;
TREEMAP_OVERHEAD = TREEMAP_OVERHEAD_32;
TREEMAP_ENTRY_OVERHEAD = TREEMAP_ENTRY_OVERHEAD_32;
ARRAYLIST_OVERHEAD = ARRAYLIST_OVERHEAD_32;
}
}
/**
* Returns the memory size occupied by a byte array of a given length. All
* arrays (regardless of element type) have the same overhead for a zero
* length array. On 32b Java, there are 4 bytes included in that fixed
* overhead that can be used for the first N elements -- however many fit
* in 4 bytes. On 64b Java, there is no extra space included. In all
* cases, space is allocated in 8 byte chunks.
*/
public static int byteArraySize(int arrayLen) {
/*
* ARRAY_OVERHEAD accounts for N bytes of data, which is 4 bytes on 32b
* Java and 0 bytes on 64b Java. Data larger than N bytes is allocated
* in 8 byte increments.
*/
int size = ARRAY_OVERHEAD;
if (arrayLen > ARRAY_SIZE_INCLUDED) {
size += ((arrayLen - ARRAY_SIZE_INCLUDED + 7) / 8) * 8;
}
return size;
}
public static int shortArraySize(int arrayLen) {
return byteArraySize(arrayLen * 2);
}
public static int intArraySize(int arrayLen) {
return byteArraySize(arrayLen * 4);
}
public static int longArraySize(int arrayLen) {
return byteArraySize(arrayLen * 8);
}
public static int objectArraySize(int arrayLen) {
return byteArraySize(arrayLen * OBJECT_REF_OVERHEAD);
}
public static int stringSize(String str) {
return (OBJECT_OVERHEAD +
OBJECT_REF_OVERHEAD +
byteArraySize(2 * str.length()));
}
}
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