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Small performance improvement in freeSpace().

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FossilOrigin-Name: 8dc5292ee592f16451441e33ad0800ba10a21ecd63f1f9926d6915a59a1552d3
This commit is contained in:
drh
2023-04-07 13:21:20 +00:00
parent 50dc8d9720
commit b39f037ca5
3 changed files with 14 additions and 17 deletions
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15
manifest
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@@ -1,5 +1,5 @@
C Increase\sthe\ssize\sof\sthe\scache\sof\sfree\sblocks\sinside\sof\spageFreeArray()\sto\nreduce\sthe\snumber\sof\scalls\sto\sfreeSpace(). C Small\sperformance\simprovement\sin\sfreeSpace().
D 2023-04-06T20:14:10.861 D 2023-04-07T13:21:20.818
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -564,7 +564,7 @@ F src/auth.c f4fa91b6a90bbc8e0d0f738aa284551739c9543a367071f55574681e0f24f8cf
F src/backup.c a2891172438e385fdbe97c11c9745676bec54f518d4447090af97189fd8e52d7 F src/backup.c a2891172438e385fdbe97c11c9745676bec54f518d4447090af97189fd8e52d7
F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d
F src/btmutex.c 6ffb0a22c19e2f9110be0964d0731d2ef1c67b5f7fabfbaeb7b9dabc4b7740ca F src/btmutex.c 6ffb0a22c19e2f9110be0964d0731d2ef1c67b5f7fabfbaeb7b9dabc4b7740ca
F src/btree.c 1a5f31d548a68d2bd537919d8afa176540c3ea70787fe10d5873beb00f9db615 F src/btree.c ab147fedb774a7af5a2b665091aaf1b3d379c0215f00958f0d8b62d0c3d8c462
F src/btree.h aa354b9bad4120af71e214666b35132712b8f2ec11869cb2315c52c81fad45cc F src/btree.h aa354b9bad4120af71e214666b35132712b8f2ec11869cb2315c52c81fad45cc
F src/btreeInt.h a3268a60cbc91f578001f44ba40aae9c1b8aecbb0d2c095dd7fc54b0872ea4b8 F src/btreeInt.h a3268a60cbc91f578001f44ba40aae9c1b8aecbb0d2c095dd7fc54b0872ea4b8
F src/build.c 8357d6ca9a8c9afc297c431df28bc2af407b47f3ef2311875276c944b30c4d54 F src/build.c 8357d6ca9a8c9afc297c431df28bc2af407b47f3ef2311875276c944b30c4d54
@@ -2052,11 +2052,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 56ea2c2fe6108d39833ac40957afab59ade01a216639d5bafdeeca53bbf4cd67 P 27c59f1ea789f3ff245f23e79ded5cd71c48e3a51ffbb8c220b51101a4e69fd7
R f4ea0d3a1a9bcf702848933fabd592b4 R d6591cb8459c4b329119f7b1d9a296cf
T *branch * btree-freespace-opt
T *sym-btree-freespace-opt *
T -sym-trunk *
U drh U drh
Z a279ebfc98f243d3f64ca427ad2184cf Z 18a83276bbdc23812267f1b7bee10433
# Remove this line to create a well-formed Fossil manifest. # Remove this line to create a well-formed Fossil manifest.

2
manifest.uuid
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@@ -1 +1 @@
27c59f1ea789f3ff245f23e79ded5cd71c48e3a51ffbb8c220b51101a4e69fd7 8dc5292ee592f16451441e33ad0800ba10a21ecd63f1f9926d6915a59a1552d3

14
src/btree.c
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@@ -1919,6 +1919,11 @@ static int freeSpace(MemPage *pPage, u16 iStart, u16 iSize){
} }
pTmp = &data[hdr+5]; pTmp = &data[hdr+5];
x = get2byte(pTmp); x = get2byte(pTmp);
if( pPage->pBt->btsFlags & BTS_FAST_SECURE ){
/* Overwrite deleted information with zeros when the secure_delete
** option is enabled */
memset(&data[iStart], 0, iSize);
}
if( iStart<=x ){ if( iStart<=x ){
/* The new freeblock is at the beginning of the cell content area, /* The new freeblock is at the beginning of the cell content area,
** so just extend the cell content area rather than create another ** so just extend the cell content area rather than create another
@@ -1930,14 +1935,9 @@ static int freeSpace(MemPage *pPage, u16 iStart, u16 iSize){
}else{ }else{
/* Insert the new freeblock into the freelist */ /* Insert the new freeblock into the freelist */
put2byte(&data[iPtr], iStart); put2byte(&data[iPtr], iStart);
put2byte(&data[iStart], iFreeBlk);
put2byte(&data[iStart+2], iSize);
} }
if( pPage->pBt->btsFlags & BTS_FAST_SECURE ){
/* Overwrite deleted information with zeros when the secure_delete
** option is enabled */
memset(&data[iStart], 0, iSize);
}
put2byte(&data[iStart], iFreeBlk);
put2byte(&data[iStart+2], iSize);
pPage->nFree += iOrigSize; pPage->nFree += iOrigSize;
return SQLITE_OK; return SQLITE_OK;
} }