Configuring High-Density Memory Store
To use the High-Density memory storage, the native memory usage must be enabled using the programmatic or declarative configuration. Also, you can configure its size, memory allocator type, minimum block size, page size and metadata space percentage.
- size: Size of the total native memory to allocate. Default value is 512 MB.
allocator type: Type of the memory allocator. Available values are:
- STANDARD: allocate/free memory using default OS memory manager.
- POOLED: manage memory blocks in thread local pools.
Default value is POOLED.
- minimum block size: Minimum size of the blocks in bytes to split and fragment a page block to assign to an allocation request. It is used only by the POOLED memory allocator. Default value is 16.
- page size: Size of the page in bytes to allocate memory as a block. It is used only by the POOLED memory allocator. Default value is
1 << 22= 4194304 Bytes, about 4 MB. - metadata space percentage: Defines the percentage of the allocated native memory that is used for the metadata such as indexes, offsets, etc. It is used only by the POOLED memory allocator. Default value is 12.5.
The following is the programmatic configuration example.
MemorySize memorySize = new MemorySize(512, MemoryUnit.MEGABYTES);
NativeMemoryConfig nativeMemoryConfig =
new NativeMemoryConfig()
.setAllocatorType(NativeMemoryConfig.MemoryAllocatorType.POOLED)
.setSize(memorySize)
.setEnabled(true)
.setMinBlockSize(16)
.setPageSize(1 << 20);
The following is the declarative configuration example.
<native-memory enabled="true" allocator-type="POOLED">
<size value="512" unit="MEGABYTES"/>
</native-memory>