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Size reduction and performance increase in defragementPage() of btree.c.

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FossilOrigin-Name: 1b03f197b5572084177012a58990f8dba7ff10382ff5657fda62867a4d0b1af9
This commit is contained in:
drh
2022-07-07 21:04:03 +00:00
parent ebaa9477d7
commit f15b77b7cf
3 changed files with 35 additions and 37 deletions
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12
manifest
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@@ -1,5 +1,5 @@
C Size\sreduction\sand\sperformance\sincrease\sin\sthe\spageFindSlot()\sroutine\sof\nbtree.c.
D 2022-07-07T20:29:49.982
C Size\sreduction\sand\sperformance\sincrease\sin\sdefragementPage()\sof\sbtree.c.
D 2022-07-07T21:04:03.223
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -510,7 +510,7 @@ F src/auth.c f4fa91b6a90bbc8e0d0f738aa284551739c9543a367071f55574681e0f24f8cf
F src/backup.c a2891172438e385fdbe97c11c9745676bec54f518d4447090af97189fd8e52d7
F src/bitvec.c 7c849aac407230278445cb069bebc5f89bf2ddd87c5ed9459b070a9175707b3d
F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
F src/btree.c 6599d972b674cbbcb76e9a9db0e206d3bf9b60186464c08ef82ab6fda0622d44
F src/btree.c 85e73fcdad6ca71caf083427d7a84ee31bce23a844f0ca3dd41f176f905090c9
F src/btree.h 74d64b8f28cfa4a894d14d4ed64fa432cd697b98b61708d4351482ae15913e22
F src/btreeInt.h 8ce1332edd89dfd2461d561ac10a0ab5601c8e06200cb5230596c3caaf54482e
F src/build.c 23f874642825d7eaaeeb7a3281b2b1a75e1d4c4dd9ae4dceddcd908266634214
@@ -1979,8 +1979,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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P 7d7aed053f600659c63d8bac6d5da77879936c3fc57bfd058a4943b3bc530575
R 573750a14fc9838f7267df2add226c79
P 5d247e38560b97975568e8a48324acaca1002ec2ef7fa3efc9c8aa7d83412aad
R a83c6075a9fd94646d9131a381899d86
U drh
Z 6e9989a326ed7411def6db942d22ad53
Z fd00ac09a5e7246ba9e920ca18028a40
# Remove this line to create a well-formed Fossil manifest.

2
manifest.uuid
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@@ -1 +1 @@
5d247e38560b97975568e8a48324acaca1002ec2ef7fa3efc9c8aa7d83412aad
1b03f197b5572084177012a58990f8dba7ff10382ff5657fda62867a4d0b1af9

12
src/btree.c
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@@ -1513,7 +1513,6 @@ static int defragmentPage(MemPage *pPage, int nMaxFrag){
assert( pPage->pBt->usableSize <= SQLITE_MAX_PAGE_SIZE );
assert( pPage->nOverflow==0 );
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
temp = 0;
src = data = pPage->aData;
hdr = pPage->hdrOffset;
cellOffset = pPage->cellOffset;
@@ -1568,6 +1567,10 @@ static int defragmentPage(MemPage *pPage, int nMaxFrag){
cbrk = usableSize;
iCellLast = usableSize - 4;
iCellStart = get2byte(&data[hdr+5]);
if( nCell>0 ){
temp = sqlite3PagerTempSpace(pPage->pBt->pPager);
memcpy(&temp[iCellStart], &data[iCellStart], usableSize - iCellStart);
src = temp;
for(i=0; i<nCell; i++){
u8 *pAddr; /* The i-th cell pointer */
pAddr = &data[cellOffset + i*2];
@@ -1590,14 +1593,9 @@ static int defragmentPage(MemPage *pPage, int nMaxFrag){
testcase( cbrk+size==usableSize );
testcase( pc+size==usableSize );
put2byte(pAddr, cbrk);
if( temp==0 ){
if( cbrk==pc ) continue;
temp = sqlite3PagerTempSpace(pPage->pBt->pPager);
memcpy(&temp[iCellStart], &data[iCellStart], usableSize - iCellStart);
src = temp;
}
memcpy(&data[cbrk], &src[pc], size);
}
}
data[hdr+7] = 0;
defragment_out: