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Change the way overflow pages are allocated from the free-list to increase the chance that they are a contiguous block. Much more can still be done. (CVS 4023)

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FossilOrigin-Name: b7391892041eb72b0ebcbb7a9a6721ae3482dd80
This commit is contained in:
danielk1977
2007-05-17 18:28:11 +00:00
parent 6338c762a5
commit b39f70b04a
4 changed files with 37 additions and 12 deletions
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18
test/speed3.test
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@ -12,7 +12,7 @@
# focus of this script is testing that the overflow-page related
# enhancements added after version 3.3.17 speed things up.
#
# $Id: speed3.test,v 1.1 2007/05/17 14:45:13 danielk1977 Exp $
# $Id: speed3.test,v 1.2 2007/05/17 18:28:11 danielk1977 Exp $
#
#---------------------------------------------------------------------
@ -97,6 +97,18 @@ proc io_log {db} {
puts "Normal : Read $stats2(read), wrote $stats2(write)"
}
proc overflow_report {db} {
set bt [btree_from_db db]
set csr [btree_cursor $bt 3 0]
for {btree_first $csr} {![btree_eof $csr]} {btree_next $csr} {
puts "[btree_ovfl_info $bt $csr]"
}
btree_close_cursor $csr
}
proc reset_db {} {
db close
sqlite3 db test.db
@ -146,6 +158,7 @@ do_test speed3-0.4 {
# Delete all content in a table, one row at a time.
#
#io_log db
#overflow_report db
reset_db
speed_trial speed3-1.incrvacuum $::NROW row {DELETE FROM main.t1 WHERE 1}
speed_trial speed3-1.normal $::NROW row {DELETE FROM aux.t1 WHERE 1}
@ -154,8 +167,9 @@ io_log db
# Select the "C" column (located at the far end of the overflow
# chain) from each table row.
#
db eval {PRAGMA incremental_vacuum(500000)}
#db eval {PRAGMA incremental_vacuum(500000)}
populate_t1 db
#overflow_report db
reset_db
speed_trial speed3-2.incrvacuum $::NROW row {SELECT c FROM main.t1}
speed_trial speed3-2.normal $::NROW row {SELECT c FROM aux.t1}