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Pierre-Yves David authored
The performance and memory benefit is much greater if we don't have to copy all the data in memory for each information. So we introduce an option (on by default) to read the data using mmap. This changeset is the last one definition the API for index support nodemap data. (they have to be able to use the mmaping). Differential Revision: https://phab.mercurial-scm.org/D7894
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