224 lines
6.5 KiB
Plaintext
224 lines
6.5 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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# $Id: malloc5.test,v 1.7 2006/01/19 08:43:32 danielk1977 Exp $
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#---------------------------------------------------------------------------
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# NOTES ON EXPECTED BEHAVIOUR
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#
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#---------------------------------------------------------------------------
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set testdir [file dirname $argv0]
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source $testdir/tester.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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if {[info command sqlite_malloc_stat]==""} {
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puts "Skipping malloc 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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sqlite3 db test.db
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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. This test case set's the
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# value of the ::pgalloc variable, which is used in subsequent tests.
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#
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# Note: Even though executing this statement on an empty database
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# modifies 2 pages (the root of sqlite_master and the new root page),
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# the sqlite_master root (page 1) is never freed because the btree layer
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# retains a reference to it for the entire transaction.
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execsql {
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BEGIN;
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CREATE TABLE abc(a, b, c);
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}
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set ::pgalloc [sqlite3_release_memory]
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expr $::pgalloc > 0
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} {1}
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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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# Because the page freed had been written to, freeing it required a
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# journal sync and exclusive lock on the database file. Test the file
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# appears to be locked.
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sqlite3 db2 test.db
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catchsql {
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SELECT * FROM abc;
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} db2
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} {1 {database is locked}}
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do_test malloc5-1.3 {
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# Again call [sqlite3_release_memory] when there is exactly one unused page
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# in the cache. The same amount of memory is required, but no journal-sync
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# or exclusive lock should be established.
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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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sqlite3_release_memory
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} $::pgalloc
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do_test malloc5-1.4 {
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# Database should not be locked this time.
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catchsql {
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SELECT * FROM abc;
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} db2
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} {0 {}}
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do_test malloc5-1.5 {
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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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execsql {
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SELECT * FROM abc;
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CREATE TABLE def(d, e, f);
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}
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sqlite3_release_memory 500
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} $::pgalloc
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do_test malloc5-1.6 {
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# Database should not be locked this time. The above test case only
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# requested 500 bytes of memory, which can be obtained by freeing the page
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# that does not require an fsync().
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catchsql {
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SELECT * FROM abc;
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} db2
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} {0 {}}
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do_test malloc5-1.7 {
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# Release another 500 bytes of memory. This time we require a sync(),
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# so the database file will be locked afterwards.
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sqlite3_release_memory 500
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} $::pgalloc
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do_test malloc5-1.8 {
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catchsql {
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SELECT * FROM abc;
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} db2
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} {1 {database is locked}}
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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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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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list $nRelease $data
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} [list $pgalloc [list 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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sqlite3_release_memory
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} [expr $::pgalloc * 2]
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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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sqlite_malloc_outstanding -clearmaxbytes
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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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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, $i, '[string repeat X 100]');"
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}
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execsql {COMMIT;}
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set ::nMaxBytes [sqlite_malloc_outstanding -maxbytes]
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if {$::nMaxBytes==""} {set ::nMaxBytes 1000001}
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expr $::nMaxBytes > 1000000
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} {1}
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do_test malloc5-4.2 {
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sqlite3_release_memory
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sqlite_malloc_outstanding -clearmaxbytes
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sqlite3_soft_heap_limit 100000
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execsql {BEGIN;}
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for {set i 0} {$i < 10000} {incr i} {
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execsql "INSERT INTO abc VALUES($i, $i, '[string repeat X 100]');"
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}
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execsql {COMMIT;}
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set ::nMaxBytes [sqlite_malloc_outstanding -maxbytes]
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if {$::nMaxBytes==""} {set ::nMaxBytes 0}
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expr $::nMaxBytes <= 100000
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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 20000 [expr int(20000.0 * 4999.5)] [expr int(20000.0 * 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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finish_test
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catch {db close}
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