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mdbx: add auto-readahead note/description.

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Change-Id: Ie425416fd1afe9092b73acae4a7e3cdb5c3d8168
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Leonid Yuriev 2019-11-09 00:05:30 +03:00
parent 4dfa97cda9
commit bb2d2877c4
1 changed files with 6 additions and 0 deletions
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mdbx.h
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@ -973,6 +973,12 @@ LIBMDBX_API const char *mdbx_dump_val(const MDBX_val *key, char *const buf,
* may help random read performance when the DB is larger than RAM and system * may help random read performance when the DB is larger than RAM and system
* RAM is full. * RAM is full.
* *
* By default libmdbx dynamically enables/disables readahead depending on the
* actual database size and currently available memory. On the other hand, such
* automation has some limitation, i.e. could be performed only when DB size
* changing but can't tracks and reacts changing a free RAM availability, since
* it changes independently and asynchronously.
*
* NOTE: The mdbx_is_readahead_reasonable() function allows to quickly find out * NOTE: The mdbx_is_readahead_reasonable() function allows to quickly find out
* whether to use readahead or not based on the size of the data and the * whether to use readahead or not based on the size of the data and the
* amount of available memory. * amount of available memory.