Memory Allocation Objects in Java

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VBoost provides two versions of a fixed-size memory manager The base model, FixedSizeMemoryManager, does not free memory until the object itself is released You can recycle memory during the memory manager's lifetime, but there is no way to get this memory back to the system The second memory manager, CompactibleFixedSizeMemoryManager, allocates and frees memory somewhat slower than its noncompactible sibling, but you don't have to destroy the memory object to return resources to the system heap There is one function on VBoostRoot, CreateFixedSizeMemoryManager, that creates both types of objects
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CreateFixedSizeMemoryManager CreateFixedSizeMemoryManager takes three parameters and returns a FixedSizeMemoryManager object If you specify compactible memory, you can assign the returned object to a CompactibleFixedSizeMemoryManager variable to get the additional methods and properties needed for compaction First, let's look at the three parameters used to create the object ElementSize (Long) specifies the amount of memory (in bytes) required by
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each allocation For performance reasons, this value is adjusted up to a four-byte boundary, so the value you read from the ElementSize property may be larger than the value you specify here ElementsPerBlock (Long) is the number of elements for which you want to
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reserve space in a single allocation Memory is allocated from the heap ElementSize * ElementsPerBlock bytes at a time fCompactible (Boolean) indicates whether you want to support compaction
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The default for this value is False If the value is True, the returned object supports both the FixedSizeMemoryManager and the CompactibleFixedSizeMemoryManager interfaces The following methods and properties are supported by both memory manager interfaces Alloc takes no parameters and returns a pointer to memory In a heap alloca-
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tion, the alloc function takes a size parameter, but that isn't needed here because each of these objects provides memory blocks with a uniform size If all previously allocated memory is in use, Alloc goes to the heap to get enough memory for another ElementsPerBlock objects Alloc can raise an out-ofmemory error Free takes a pointer returned by Alloc as a parameter and makes it available
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for a subsequent call to Alloc Free does not validate the incoming pointer and does not return an error, so make sure you give it a valid pointer to avoid a crash ElementSize is a read-only property that returns the size of an allocation
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returned by Alloc This may be the same as the ElementSize parameter passed to CreateFixedSizeMemoryManager, but is always adjusted up to a four-byte
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boundary For example, a request for 10 bytes actually gives you an ElementSize of 12 Maintaining four-byte alignment makes life a lot easier on your processor and is worth the extra padding memory ElementsPerBlock is a read-only property that returns the number of items
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created per heap allocation The remaining properties apply only to the compactible object CompactOnFree is a read-write property that indicates whether you want to
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give memory back to the heap during a call to Free or if you want the object to wait for an explicit Compact call CompactOnFree defaults to False BufferBlocks is a read-write property that indicates how many empty blocks
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you want to keep when Compact is called If you alternate Alloc and Free calls, you may end up on the boundary of a block When this happens, a Free call frees a block of memory, and the next Alloc call requires more memory and reallocates a block of the same size that it just freed Clearly, this happens only if CompactOnFree is True To prevent thrashing memory in this fashion, you can specify that the allocator should not give the last BufferBlocks blocks back to the heap during a compaction Changing BufferBlocks does not automatically trigger a compact; you must explicitly call Compact to actually free any empty blocks BufferBlocks defaults to 1 Compact is called when you want to give memory back to the heap The amount
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of memory actually freed depends on the BufferBlocks setting If CompactOnFree is True and you haven't recently reduced the value of BufferBlocks, you don't need to call Compact explicitly BufferBlocks = 0 followed by Compact releases all blocks of memory which are no longer in use by any allocated object
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