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Re:Ask HN: LZ4 was not added as an optional compressor in HT... by tandemstrong on Thursday May 07, 2015 @05:47AM (#9503991)
Well, it will use much less than that. The real "memory cost" of decompression will be : + compressed size

and that's it. Decompression doesn't use any memory, only the I/O buffers.

On the compression side, the memory cost is : + buffer for compression (typically == size of data to compress) + 16 KB for tables

And that's it.

We are very very far from the 12 MB mentioned.

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