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Overview
Comment: | Reorder fields in the PgHdr object for a performance increase. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
326e63d71e0e164c5bcd1f74772cb407 |
User & Date: | drh 2017-05-31 03:20:39.040 |
Context
2017-05-31
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11:24 | Very small performance increase in sqlite3VdbeSetNumCols(). (check-in: 8885b44610 user: drh tags: trunk) | |
03:20 | Reorder fields in the PgHdr object for a performance increase. (check-in: 326e63d71e user: drh tags: trunk) | |
02:58 | Avoid unnecessary memory zeroing during expression list allocation. (check-in: de28e6514a user: drh tags: trunk) | |
Changes
Changes to src/pcache.h.
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22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | ** Every page in the cache is controlled by an instance of the following ** structure. */ struct PgHdr { sqlite3_pcache_page *pPage; /* Pcache object page handle */ void *pData; /* Page data */ void *pExtra; /* Extra content */ PgHdr *pDirty; /* Transient list of dirty sorted by pgno */ Pager *pPager; /* The pager this page is part of */ Pgno pgno; /* Page number for this page */ #ifdef SQLITE_CHECK_PAGES u32 pageHash; /* Hash of page content */ #endif u16 flags; /* PGHDR flags defined below */ /********************************************************************** | > | | > < < | 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | ** Every page in the cache is controlled by an instance of the following ** structure. */ struct PgHdr { sqlite3_pcache_page *pPage; /* Pcache object page handle */ void *pData; /* Page data */ void *pExtra; /* Extra content */ PCache *pCache; /* PRIVATE: Cache that owns this page */ PgHdr *pDirty; /* Transient list of dirty sorted by pgno */ Pager *pPager; /* The pager this page is part of */ Pgno pgno; /* Page number for this page */ #ifdef SQLITE_CHECK_PAGES u32 pageHash; /* Hash of page content */ #endif u16 flags; /* PGHDR flags defined below */ /********************************************************************** ** Elements above, except pCache, are public. All that follow are ** private to pcache.c and should not be accessed by other modules. ** pCache is grouped with the public elements for efficiency. */ i16 nRef; /* Number of users of this page */ PgHdr *pDirtyNext; /* Next element in list of dirty pages */ PgHdr *pDirtyPrev; /* Previous element in list of dirty pages */ }; /* Bit values for PgHdr.flags */ #define PGHDR_CLEAN 0x001 /* Page not on the PCache.pDirty list */ #define PGHDR_DIRTY 0x002 /* Page is on the PCache.pDirty list */ |
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