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mdbx: add MDBX_opt_loose_limit runtime option.

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More for https://github.com/erthink/libmdbx/issues/128

Change-Id: I298bf1eef24575df72615ee07e93f5073405e8e0
This commit is contained in:
Leonid Yuriev
2021-01-22 23:52:03 +03:00
parent dc34041600
commit 4ae2a107bf
3 changed files with 39 additions and 9 deletions
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25
mdbx.h
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@@ -1852,18 +1852,31 @@ enum MDBX_option_t {
* process. Default is 262144, it is usually enough for most cases. */
MDBX_opt_rp_augment_limit,
/** \brief Controls the in-process limit to grow a list of
* pre-allocated/reserved dirty pages.
/** \brief Controls the in-process limit to grow a cache of dirty
* pages for reuse in the current transaction.
*
* \details A 'dirty page' refers to a page that has been updated in memory
* only, the changes to a dirty page are not yet stored on disk.
* To reduce overhead, it is reasonable to release not all such pages
* immediately, but to leave some ones in cache for reuse in the current
* transaction.
*
* The `MDBX_opt_loose_limit` allows you to set a limit for such cache inside
* the current process. Should be in the range 0..255, default is 64. */
MDBX_opt_loose_limit,
/** \brief Controls the in-process limit of a pre-allocated memory items
* for dirty pages.
*
* \details A 'dirty page' refers to a page that has been updated in memory
* only, the changes to a dirty page are not yet stored on disk.
* Without \ref MDBX_WRITEMAP dirty pages are allocated from memory and
* released when a transaction is committed. To reduce overhead, it is
* reasonable to release not all pages, but to leave some ones in reserve for
* reuse in the next transaction.
* reasonable to release not all ones, but to leave some allocations in
* reserve for reuse in the next transaction(s).
*
* The `MDBX_opt_dp_reserve_limit` allows you to set a limit for such a
* reserve inside the current process. Default is 1024. */
* The `MDBX_opt_dp_reserve_limit` allows you to set a limit for such reserve
* inside the current process. Default is 1024. */
MDBX_opt_dp_reserve_limit,
/** \brief Controls the in-process limit of dirty pages