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simple 16x striping for namescache

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Maxim.Mossienko
2013-07-01 19:36:11 +02:00
parent 8c164a83b2
commit c895fdf4a3
1 changed files with 14 additions and 5 deletions
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platform/platform-impl/src/com/intellij/openapi/vfs/newvfs/impl/FileNameCache.java
+14 -5
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@@ -33,7 +33,14 @@ import org.jetbrains.annotations.Nullable;
public class FileNameCache {
private static final PersistentStringEnumerator ourNames = FSRecords.getNames();
@NonNls private static final String EMPTY = "";
private static final IntSLRUCache<IntObjectLinkedMap.MapEntry<Object>> ourNameCache = new IntSLRUCache<IntObjectLinkedMap.MapEntry<Object>>(40000, 20000);
@SuppressWarnings("unchecked") private static final IntSLRUCache<IntObjectLinkedMap.MapEntry<Object>>[] ourNameCache = new IntSLRUCache[16];
static {
final int protectedSize = 40000 / ourNameCache.length;
final int probationalSize = 20000 / ourNameCache.length;
for(int i = 0; i < ourNameCache.length; ++i) {
ourNameCache[i] = new IntSLRUCache<IntObjectLinkedMap.MapEntry<Object>>(protectedSize, probationalSize);
}
}
public static int storeName(@NotNull String name) {
final int idx = FSRecords.getNameId(name);
@@ -50,8 +57,9 @@ public class FileNameCache {
Object rawName = convertToBytesIfAsciiString(name);
IntObjectLinkedMap.MapEntry<Object> entry = new IntObjectLinkedMap.MapEntry<Object>(id, rawName);
synchronized (ourNameCache) {
return ourNameCache.cacheEntry(entry);
final int stripe = id % ourNameCache.length;
synchronized (ourNameCache[stripe]) {
return ourNameCache[stripe].cacheEntry(entry);
}
}
@@ -72,8 +80,9 @@ public class FileNameCache {
@NotNull
private static IntObjectLinkedMap.MapEntry<Object> getEntry(int id) {
synchronized (ourNameCache) {
IntObjectLinkedMap.MapEntry<Object> entry = ourNameCache.getCachedEntry(id);
final int stripe = id % ourNameCache.length;
synchronized (ourNameCache[stripe]) {
IntObjectLinkedMap.MapEntry<Object> entry = ourNameCache[stripe].getCachedEntry(id);
if (entry != null) {
return entry;
}