tillrohrmann commented on a change in pull request #13316:
URL: https://github.com/apache/flink/pull/13316#discussion_r483452267
##########
File path:
flink-runtime/src/main/java/org/apache/flink/runtime/io/network/buffer/NetworkBufferPool.java
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@@ -271,12 +271,28 @@ public int getTotalNumberOfMemorySegments() {
return totalNumberOfMemorySegments;
}
+ public long getTotalMemory() {
+ return getTotalNumberOfMemorySegments() * memorySegmentSize;
+ }
+
public int getNumberOfAvailableMemorySegments() {
synchronized (availableMemorySegments) {
return availableMemorySegments.size();
}
}
+ public long getAvailableMemory() {
+ return getNumberOfAvailableMemorySegments() * memorySegmentSize;
+ }
+
+ public int getNumberOfUsedMemorySegments() {
+ return getTotalNumberOfMemorySegments() -
getNumberOfAvailableMemorySegments();
+ }
+
+ public long getUsedMemory() {
+ return getNumberOfUsedMemorySegments() * memorySegmentSize;
+ }
Review comment:
What is the semantic of this method? Shall it return the number of
handed out memory segments to a set of `LocalBufferPools` or shall it return
the size of the actually used memory? If it is the latter, then I am afraid
that memory which has been handed out to the `LocalBufferPools` might also be
idling there. Hence this value won't tell us how much memory is currently been
used.
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