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sometimes returns slightly more space than requested. FossilOrigin-Name: 3d5eae1c26353cdee89f31f1293b05c0edb494c775ba0912d9b4fda9ab0ef304
422 lines
13 KiB
Plaintext
422 lines
13 KiB
Plaintext
# 2005 November 30
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# This file contains test cases focused on the two memory-management APIs,
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# sqlite3_soft_heap_limit() and sqlite3_release_memory().
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#
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# Prior to version 3.6.2, calling sqlite3_release_memory() or exceeding
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# the configured soft heap limit could cause sqlite to upgrade database
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# locks and flush dirty pages to the file system. As of 3.6.2, this is
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# no longer the case. In version 3.6.2, sqlite3_release_memory() only
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# reclaims clean pages. This test file has been updated accordingly.
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#
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# $Id: malloc5.test,v 1.22 2009/04/11 19:09:54 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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source $testdir/malloc_common.tcl
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db close
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# Only run these tests if memory debugging is turned on.
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#
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if {!$MEMDEBUG} {
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puts "Skipping malloc5 tests: not compiled with -DSQLITE_MEMDEBUG..."
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finish_test
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return
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}
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# Skip these tests if OMIT_MEMORY_MANAGEMENT was defined at compile time.
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ifcapable !memorymanage {
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finish_test
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return
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}
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# The sizes of memory allocations from system malloc() might vary,
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# depending on the memory allocator algorithms used. The following
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# routine is designed to support answers that fall within a range
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# of values while also supplying easy-to-understand "expected" values
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# when errors occur.
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#
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proc value_in_range {target x args} {
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set v [lindex $args 0]
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if {$v!=""} {
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if {$v<$target*$x} {return $v}
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if {$v>$target/$x} {return $v}
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}
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return "number between [expr {int($target*$x)}] and [expr {int($target/$x)}]"
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}
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set mrange 0.98 ;# plus or minus 2%
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test_set_config_pagecache 0 100
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sqlite3_soft_heap_limit 0
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sqlite3 db test.db
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# db eval {PRAGMA cache_size=1}
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do_test malloc5-1.1 {
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# Simplest possible test. Call sqlite3_release_memory when there is exactly
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# one unused page in a single pager cache. The page cannot be freed, as
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# it is dirty. So sqlite3_release_memory() returns 0.
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#
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execsql {
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PRAGMA auto_vacuum=OFF;
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BEGIN;
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CREATE TABLE abc(a, b, c);
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}
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sqlite3_release_memory
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} {0}
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do_test malloc5-1.2 {
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# Test that the transaction started in the above test is still active.
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# The lock on the database file should not have been upgraded (this was
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# not the case before version 3.6.2).
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#
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sqlite3 db2 test.db
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execsql {PRAGMA cache_size=2; SELECT * FROM sqlite_master } db2
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} {}
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do_test malloc5-1.3 {
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# Call [sqlite3_release_memory] when there is exactly one unused page
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# in the cache belonging to db2.
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#
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set ::pgalloc [sqlite3_release_memory]
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value_in_range 1288 0.75
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} [value_in_range 1288 0.75]
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do_test malloc5-1.4 {
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# Commit the transaction and open a new one. Read 1 page into the cache.
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# Because the page is not dirty, it is eligible for collection even
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# before the transaction is concluded.
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#
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execsql {
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COMMIT;
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BEGIN;
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SELECT * FROM abc;
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}
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value_in_range $::pgalloc $::mrange [sqlite3_release_memory]
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} [value_in_range $::pgalloc $::mrange]
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do_test malloc5-1.5 {
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# Conclude the transaction opened in the previous [do_test] block. This
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# causes another page (page 1) to become eligible for recycling.
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#
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execsql { COMMIT }
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value_in_range $::pgalloc $::mrange [sqlite3_release_memory]
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} [value_in_range $::pgalloc $::mrange]
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do_test malloc5-1.6 {
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# Manipulate the cache so that it contains two unused pages. One requires
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# a journal-sync to free, the other does not.
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db2 close
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execsql {
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BEGIN;
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CREATE TABLE def(d, e, f);
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SELECT * FROM abc;
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}
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value_in_range $::pgalloc $::mrange [sqlite3_release_memory 500]
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} [value_in_range $::pgalloc $::mrange]
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do_test malloc5-1.7 {
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# Database should not be locked this time.
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sqlite3 db2 test.db
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catchsql { SELECT * FROM abc } db2
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} {0 {}}
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do_test malloc5-1.8 {
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# Try to release another block of memory. This will fail as the only
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# pages currently in the cache are dirty (page 3) or pinned (page 1).
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db2 close
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sqlite3_release_memory 500
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} 0
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do_test malloc5-1.8 {
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# Database is still not locked.
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#
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sqlite3 db2 test.db
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catchsql { SELECT * FROM abc } db2
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} {0 {}}
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do_test malloc5-1.9 {
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execsql {
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COMMIT;
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}
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} {}
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do_test malloc5-2.1 {
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# Put some data in tables abc and def. Both tables are still wholly
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# contained within their root pages.
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execsql {
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INSERT INTO abc VALUES(1, 2, 3);
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INSERT INTO abc VALUES(4, 5, 6);
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INSERT INTO def VALUES(7, 8, 9);
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INSERT INTO def VALUES(10,11,12);
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}
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} {}
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do_test malloc5-2.2 {
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# Load the root-page for table def into the cache. Then query table abc.
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# Halfway through the query call sqlite3_release_memory(). The goal of this
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# test is to make sure we don't free pages that are in use (specifically,
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# the root of table abc).
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sqlite3_release_memory
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set nRelease 0
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execsql {
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BEGIN;
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SELECT * FROM def;
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}
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set data [list]
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db eval {SELECT * FROM abc} {
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incr nRelease [sqlite3_release_memory]
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lappend data $a $b $c
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}
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execsql {
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COMMIT;
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}
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value_in_range $::pgalloc $::mrange $nRelease
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} [value_in_range $::pgalloc $::mrange]
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do_test malloc5-2.2.1 {
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set data
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} {1 2 3 4 5 6}
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do_test malloc5-3.1 {
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# Simple test to show that if two pagers are opened from within this
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# thread, memory is freed from both when sqlite3_release_memory() is
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# called.
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execsql {
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BEGIN;
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SELECT * FROM abc;
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}
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execsql {
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SELECT * FROM sqlite_master;
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BEGIN;
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SELECT * FROM def;
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} db2
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value_in_range [expr $::pgalloc*2] 0.99 [sqlite3_release_memory]
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} [value_in_range [expr $::pgalloc * 2] 0.99]
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do_test malloc5-3.2 {
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concat \
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[execsql {SELECT * FROM abc; COMMIT}] \
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[execsql {SELECT * FROM def; COMMIT} db2]
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} {1 2 3 4 5 6 7 8 9 10 11 12}
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db2 close
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puts "Highwater mark: [sqlite3_memory_highwater]"
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# The following two test cases each execute a transaction in which
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# 10000 rows are inserted into table abc. The first test case is used
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# to ensure that more than 1MB of dynamic memory is used to perform
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# the transaction.
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#
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# The second test case sets the "soft-heap-limit" to 100,000 bytes (0.1 MB)
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# and tests to see that this limit is not exceeded at any point during
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# transaction execution.
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#
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# Before executing malloc5-4.* we save the value of the current soft heap
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# limit in variable ::soft_limit. The original value is restored after
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# running the tests.
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#
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set ::soft_limit [sqlite3_soft_heap_limit -1]
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execsql {PRAGMA cache_size=2000}
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do_test malloc5-4.1 {
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execsql {BEGIN;}
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execsql {DELETE FROM abc;}
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for {set i 0} {$i < 10000} {incr i} {
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execsql "INSERT INTO abc VALUES($i, $i, '[string repeat X 100]');"
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}
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execsql {COMMIT;}
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db cache flush
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sqlite3_release_memory
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sqlite3_memory_highwater 1
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execsql {SELECT * FROM abc}
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set nMaxBytes [sqlite3_memory_highwater 1]
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puts -nonewline " (Highwater mark: $nMaxBytes) "
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expr $nMaxBytes > 1000000
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} {1}
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do_test malloc5-4.2 {
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db eval {PRAGMA cache_size=1}
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db cache flush
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sqlite3_release_memory
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sqlite3_soft_heap_limit 200000
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sqlite3_memory_highwater 1
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execsql {SELECT * FROM abc}
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set nMaxBytes [sqlite3_memory_highwater 1]
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puts -nonewline " (Highwater mark: $nMaxBytes) "
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expr $nMaxBytes <= 210000
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} {1}
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do_test malloc5-4.3 {
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# Check that the content of table abc is at least roughly as expected.
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execsql {
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SELECT count(*), sum(a), sum(b) FROM abc;
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}
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} [list 10000 [expr int(10000.0 * 4999.5)] [expr int(10000.0 * 4999.5)]]
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# Restore the soft heap limit.
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sqlite3_soft_heap_limit $::soft_limit
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# Test that there are no problems calling sqlite3_release_memory when
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# there are open in-memory databases.
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#
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# At one point these tests would cause a seg-fault.
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#
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do_test malloc5-5.1 {
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db close
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sqlite3 db :memory:
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execsql {
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BEGIN;
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CREATE TABLE abc(a, b, c);
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INSERT INTO abc VALUES('abcdefghi', 1234567890, NULL);
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INSERT INTO abc SELECT * FROM abc;
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INSERT INTO abc SELECT * FROM abc;
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INSERT INTO abc SELECT * FROM abc;
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INSERT INTO abc SELECT * FROM abc;
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INSERT INTO abc SELECT * FROM abc;
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INSERT INTO abc SELECT * FROM abc;
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INSERT INTO abc SELECT * FROM abc;
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}
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sqlite3_release_memory
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} 0
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do_test malloc5-5.2 {
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sqlite3_soft_heap_limit 5000
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execsql {
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COMMIT;
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PRAGMA temp_store = memory;
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SELECT * FROM abc ORDER BY a;
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}
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expr 1
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} {1}
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sqlite3_soft_heap_limit $::soft_limit
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#-------------------------------------------------------------------------
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# The following test cases (malloc5-6.*) test the new global LRU list
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# used to determine the pages to recycle when sqlite3_release_memory is
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# called and there is more than one pager open.
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#
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proc nPage {db} {
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set bt [btree_from_db $db]
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array set stats [btree_pager_stats $bt]
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set stats(page)
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}
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db close
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forcedelete test.db test.db-journal test2.db test2.db-journal
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# This block of test-cases (malloc5-6.1.*) prepares two database files
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# for the subsequent tests.
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do_test malloc5-6.1.1 {
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sqlite3 db test.db
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execsql {
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PRAGMA page_size=1024;
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PRAGMA default_cache_size=2;
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}
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execsql {
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PRAGMA temp_store = memory;
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BEGIN;
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CREATE TABLE abc(a PRIMARY KEY, b, c);
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INSERT INTO abc VALUES(randstr(50,50), randstr(75,75), randstr(100,100));
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INSERT INTO abc
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SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
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INSERT INTO abc
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SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
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INSERT INTO abc
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SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
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INSERT INTO abc
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SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
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INSERT INTO abc
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SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
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INSERT INTO abc
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SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
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COMMIT;
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}
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forcecopy test.db test2.db
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sqlite3 db2 test2.db
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db2 eval {PRAGMA cache_size=2}
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list \
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[expr ([file size test.db]/1024)>20] [expr ([file size test2.db]/1024)>20]
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} {1 1}
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do_test malloc5-6.1.2 {
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list [execsql {PRAGMA cache_size}] [execsql {PRAGMA cache_size} db2]
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} {2 2}
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do_test malloc5-6.2.1 {
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execsql {SELECT * FROM abc} db2
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execsql {SELECT * FROM abc} db
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expr [nPage db] + [nPage db2]
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} {4}
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do_test malloc5-6.2.2 {
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# If we now try to reclaim some memory, it should come from the db2 cache.
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sqlite3_release_memory 3000
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expr [nPage db] + [nPage db2]
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} {1}
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do_test malloc5-6.2.3 {
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# Access the db2 cache again, so that all the db2 pages have been used
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# more recently than all the db pages. Then try to reclaim 3000 bytes.
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# This time, 3 pages should be pulled from the db cache.
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execsql { SELECT * FROM abc } db2
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sqlite3_release_memory 3000
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expr [nPage db] + [nPage db2]
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} {0}
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do_test malloc5-6.3.1 {
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# Now open a transaction and update 2 pages in the db2 cache. Then
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# do a SELECT on the db cache so that all the db pages are more recently
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# used than the db2 pages. When we try to free memory, SQLite should
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# free the non-dirty db2 pages, then the db pages, then finally use
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# sync() to free up the dirty db2 pages. The only page that cannot be
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# freed is page1 of db2. Because there is an open transaction, the
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# btree layer holds a reference to page 1 in the db2 cache.
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#
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# UPDATE: No longer. As release_memory() does not cause a sync()
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execsql {
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BEGIN;
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UPDATE abc SET c = randstr(100,100)
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WHERE rowid = 1 OR rowid = (SELECT max(rowid) FROM abc);
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} db2
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execsql { SELECT * FROM abc } db
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expr [nPage db] + [nPage db2]
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} {4}
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do_test malloc5-6.3.2 {
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# Try to release 7700 bytes. This should release all the
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# non-dirty pages held by db2.
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sqlite3_release_memory [expr 7*1132]
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list [nPage db] [nPage db2]
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} {0 3}
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do_test malloc5-6.3.3 {
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# Try to release another 1000 bytes. This should come fromt the db
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# cache, since all three pages held by db2 are either in-use or diry.
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sqlite3_release_memory 1000
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list [nPage db] [nPage db2]
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} {0 3}
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do_test malloc5-6.3.4 {
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# Now release 9900 more (about 9 pages worth). This should expunge
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# the rest of the db cache. But the db2 cache remains intact, because
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# SQLite tries to avoid calling sync().
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if {$::tcl_platform(wordSize)==8} {
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sqlite3_release_memory 10500
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} else {
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sqlite3_release_memory 9900
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}
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list [nPage db] [nPage db2]
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} {0 3}
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do_test malloc5-6.3.5 {
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# But if we are really insistent, SQLite will consent to call sync()
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# if there is no other option. UPDATE: As of 3.6.2, SQLite will not
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# call sync() in this scenario. So no further memory can be reclaimed.
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sqlite3_release_memory 1000
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list [nPage db] [nPage db2]
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} {0 3}
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do_test malloc5-6.3.6 {
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# The referenced page (page 1 of the db2 cache) will not be freed no
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# matter how much memory we ask for:
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sqlite3_release_memory 31459
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list [nPage db] [nPage db2]
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} {0 3}
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db2 close
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sqlite3_soft_heap_limit $::soft_limit
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test_restore_config_pagecache
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finish_test
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catch {db close}
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