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Explain that mempool memory is added to -dbcache #13676
referenced this pull request
Aug 29, 2018
That's not just the case during IBD.
At any point in time, the total memory is limited by the headers in memory, network buffers, validation caches, UTXO set cache, mempool, plus some overhead.
When the mempool limit is not reached, the UTXO set cache is allowed to grow and use the mempool space as well, but this shouldn't affect users' expectations of memory usage. It'd also independent of IBD or not.