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Performance optimization in accessPayload().

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FossilOrigin-Name: ebb1fd98d4e448aa6d8f1e5be7ddc5bedb3db95b
This commit is contained in:
drh 2017-01-27 01:13:49 +00:00
parent 42e28f12a3
commit cdf360a0d5
3 changed files with 17 additions and 17 deletions
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12
manifest
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@ -1,5 +1,5 @@
C Simplify\sthe\saccessPayload()\sroutine\sso\sthat\sit\salways\spopulates\sthe\soverflow\npage\scache.\s\sIn\sthe\sone\scase\swhere\spopulating\sthe\spage\scache\scan\slead\sto\s\nproblems,\ssimply\sinvalidate\sthe\scache\sas\ssoon\sas\saccessPayload()\sreturns.\s\s\nThis\ssimplification\sreduces\scode\ssize\sand\shelps\saccessPayload()\sto\srun\sa\s\nlittle\sfaster.\s\sThis\sbacks\sout\sthe\seOp==2\smode\sof\saccessPayload()\sadded\sby\s\ncheck-in\s[da59198505].
D 2017-01-27T00:31:59.289
C Performance\soptimization\sin\saccessPayload().
D 2017-01-27T01:13:49.702
F Makefile.in 5f415e7867296d678fed2e6779aea10c1318b4bc
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@ -333,7 +333,7 @@ F src/auth.c 930b376a9c56998557367e6f7f8aaeac82a2a792
F src/backup.c faf17e60b43233c214aae6a8179d24503a61e83b
F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
F src/btmutex.c 0e9ce2d56159b89b9bc8e197e023ee11e39ff8ca
F src/btree.c d42f290214e6615020b61866fe0747f02614964e
F src/btree.c 1329274c46bc554daf7acde825f72f76f66647ec
F src/btree.h e6d352808956ec163a17f832193a3e198b3fb0ac
F src/btreeInt.h 10c4b77c2fb399580babbcc7cf652ac10dba796e
F src/build.c 9e799f1edd910dfa8a0bc29bd390d35d310596af
@ -1547,7 +1547,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P 293bf3ed7e40745349c83b202b27ed1b48517e1a
R ec063431f8eb3294f488a586b69214cb
P 68e7a8c6765649195ef1ad9407d87d44a307b462
R cab1deb289447016960f1fadc0c9e121
U drh
Z 81eb07f579988e3e7128daaaea36d064
Z 955f6c694c099beee31ec142603efb52

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manifest.uuid
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68e7a8c6765649195ef1ad9407d87d44a307b462
ebb1fd98d4e448aa6d8f1e5be7ddc5bedb3db95b

20
src/btree.c
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@ -4525,16 +4525,16 @@ static int accessPayload(
}
memset(pCur->aOverflow, 0, nOvfl*sizeof(Pgno));
pCur->curFlags |= BTCF_ValidOvfl;
}
/* If the overflow page-list cache has been allocated and the
** entry for the first required overflow page is valid, skip
** directly to it.
*/
if( pCur->aOverflow[offset/ovflSize] ){
iIdx = (offset/ovflSize);
nextPage = pCur->aOverflow[iIdx];
offset = (offset%ovflSize);
}else{
/* If the overflow page-list cache has been allocated and the
** entry for the first required overflow page is valid, skip
** directly to it.
*/
if( pCur->aOverflow[offset/ovflSize] ){
iIdx = (offset/ovflSize);
nextPage = pCur->aOverflow[iIdx];
offset = (offset%ovflSize);
}
}
assert( rc==SQLITE_OK && amt>0 );