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third_party/sqlite/src/test/malloc5.test

Index: third_party/sqlite/src/test/malloc5.test
diff --git a/third_party/sqlite/src/test/malloc5.test b/third_party/sqlite/src/test/malloc5.test
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+# 2005 November 30
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# This file contains test cases focused on the two memory-management APIs, 
+# sqlite3_soft_heap_limit() and sqlite3_release_memory().
+#
+# Prior to version 3.6.2, calling sqlite3_release_memory() or exceeding
+# the configured soft heap limit could cause sqlite to upgrade database 
+# locks and flush dirty pages to the file system. As of 3.6.2, this is
+# no longer the case. In version 3.6.2, sqlite3_release_memory() only
+# reclaims clean pages. This test file has been updated accordingly.
+#
+# $Id: malloc5.test,v 1.22 2009/04/11 19:09:54 drh Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+source $testdir/malloc_common.tcl
+db close
+
+# Only run these tests if memory debugging is turned on.
+#
+if {!$MEMDEBUG} {
+   puts "Skipping malloc5 tests: not compiled with -DSQLITE_MEMDEBUG..."
+   finish_test
+   return
+}
+
+# Skip these tests if OMIT_MEMORY_MANAGEMENT was defined at compile time.
+ifcapable !memorymanage {
+   finish_test
+   return
+}
+
+sqlite3_soft_heap_limit 0
+sqlite3 db test.db
+
+do_test malloc5-1.1 {
+  # Simplest possible test. Call sqlite3_release_memory when there is exactly
+  # one unused page in a single pager cache. The page cannot be freed, as
+  # it is dirty. So sqlite3_release_memory() returns 0.
+  #
+  execsql {
+    PRAGMA auto_vacuum=OFF;
+    BEGIN;
+    CREATE TABLE abc(a, b, c);
+  }
+  sqlite3_release_memory
+} {0}
+
+do_test malloc5-1.2 {
+  # Test that the transaction started in the above test is still active.
+  # The lock on the database file should not have been upgraded (this was
+  # not the case before version 3.6.2).
+  #
+  sqlite3 db2 test.db
+  execsql { SELECT * FROM sqlite_master } db2
+} {}
+do_test malloc5-1.3 {
+  # Call [sqlite3_release_memory] when there is exactly one unused page 
+  # in the cache belonging to db2.
+  #
+  set ::pgalloc [sqlite3_release_memory]
+  expr $::pgalloc > 0
+} {1}
+
+do_test malloc5-1.4 {
+  # Commit the transaction and open a new one. Read 1 page into the cache.
+  # Because the page is not dirty, it is eligible for collection even
+  # before the transaction is concluded.
+  #
+  execsql {
+    COMMIT;
+    BEGIN;
+    SELECT * FROM abc;
+  }
+  sqlite3_release_memory
+} $::pgalloc
+
+do_test malloc5-1.5 {
+  # Conclude the transaction opened in the previous [do_test] block. This
+  # causes another page (page 1) to become eligible for recycling.
+  #
+  execsql { COMMIT }
+  sqlite3_release_memory
+} $::pgalloc
+
+do_test malloc5-1.6 {
+  # Manipulate the cache so that it contains two unused pages. One requires 
+  # a journal-sync to free, the other does not.
+  db2 close
+  execsql {
+    BEGIN;
+    SELECT * FROM abc;
+    CREATE TABLE def(d, e, f);
+  }
+  sqlite3_release_memory 500
+} $::pgalloc
+
+do_test malloc5-1.7 {
+  # Database should not be locked this time. 
+  sqlite3 db2 test.db
+  catchsql { SELECT * FROM abc } db2
+} {0 {}}
+do_test malloc5-1.8 {
+  # Try to release another block of memory. This will fail as the only
+  # pages currently in the cache are dirty (page 3) or pinned (page 1).
+  db2 close
+  sqlite3_release_memory 500
+} 0
+do_test malloc5-1.8 {
+  # Database is still not locked.
+  #
+  sqlite3 db2 test.db
+  catchsql { SELECT * FROM abc } db2
+} {0 {}}
+do_test malloc5-1.9 {
+  execsql {
+    COMMIT;
+  }
+} {}
+
+do_test malloc5-2.1 {
+  # Put some data in tables abc and def. Both tables are still wholly 
+  # contained within their root pages.
+  execsql {
+    INSERT INTO abc VALUES(1, 2, 3);
+    INSERT INTO abc VALUES(4, 5, 6);
+    INSERT INTO def VALUES(7, 8, 9);
+    INSERT INTO def VALUES(10,11,12);
+  }
+} {}
+do_test malloc5-2.2 {
+  # Load the root-page for table def into the cache. Then query table abc. 
+  # Halfway through the query call sqlite3_release_memory(). The goal of this
+  # test is to make sure we don't free pages that are in use (specifically, 
+  # the root of table abc).
+  sqlite3_release_memory
+  set nRelease 0
+  execsql { 
+    BEGIN;
+    SELECT * FROM def;
+  }
+  set data [list]
+  db eval {SELECT * FROM abc} {
+    incr nRelease [sqlite3_release_memory]
+    lappend data $a $b $c
+  }
+  execsql {
+    COMMIT;
+  }
+  list $nRelease $data
+} [list $pgalloc [list 1 2 3 4 5 6]]
+
+do_test malloc5-3.1 {
+  # Simple test to show that if two pagers are opened from within this
+  # thread, memory is freed from both when sqlite3_release_memory() is
+  # called.
+  execsql {
+    BEGIN;
+    SELECT * FROM abc;
+  }
+  execsql {
+    SELECT * FROM sqlite_master;
+    BEGIN;
+    SELECT * FROM def;
+  } db2
+  sqlite3_release_memory
+} [expr $::pgalloc * 2]
+do_test malloc5-3.2 {
+  concat \
+    [execsql {SELECT * FROM abc; COMMIT}] \
+    [execsql {SELECT * FROM def; COMMIT} db2]
+} {1 2 3 4 5 6 7 8 9 10 11 12}
+
+db2 close
+puts "Highwater mark: [sqlite3_memory_highwater]"
+
+# The following two test cases each execute a transaction in which 
+# 10000 rows are inserted into table abc. The first test case is used
+# to ensure that more than 1MB of dynamic memory is used to perform
+# the transaction. 
+#
+# The second test case sets the "soft-heap-limit" to 100,000 bytes (0.1 MB)
+# and tests to see that this limit is not exceeded at any point during 
+# transaction execution.
+#
+# Before executing malloc5-4.* we save the value of the current soft heap 
+# limit in variable ::soft_limit. The original value is restored after 
+# running the tests.
+#
+set ::soft_limit [sqlite3_soft_heap_limit -1]
+execsql {PRAGMA cache_size=2000}
+do_test malloc5-4.1 {
+  execsql {BEGIN;}
+  execsql {DELETE FROM abc;}
+  for {set i 0} {$i < 10000} {incr i} {
+    execsql "INSERT INTO abc VALUES($i, $i, '[string repeat X 100]');"
+  }
+  execsql {COMMIT;}
+  sqlite3_release_memory
+  sqlite3_memory_highwater 1
+  execsql {SELECT * FROM abc}
+  set nMaxBytes [sqlite3_memory_highwater 1]
+  puts -nonewline " (Highwater mark: $nMaxBytes) "
+  expr $nMaxBytes > 1000000
+} {1}
+do_test malloc5-4.2 {
+  sqlite3_release_memory
+  sqlite3_soft_heap_limit 100000
+  sqlite3_memory_highwater 1
+  execsql {SELECT * FROM abc}
+  set nMaxBytes [sqlite3_memory_highwater 1]
+  puts -nonewline " (Highwater mark: $nMaxBytes) "
+  expr $nMaxBytes <= 100000
+} {1}
+do_test malloc5-4.3 {
+  # Check that the content of table abc is at least roughly as expected.
+  execsql {
+    SELECT count(*), sum(a), sum(b) FROM abc;
+  }
+} [list 10000 [expr int(10000.0 * 4999.5)] [expr int(10000.0 * 4999.5)]]
+
+# Restore the soft heap limit.
+sqlite3_soft_heap_limit $::soft_limit
+
+# Test that there are no problems calling sqlite3_release_memory when
+# there are open in-memory databases.
+#
+# At one point these tests would cause a seg-fault.
+#
+do_test malloc5-5.1 {
+  db close
+  sqlite3 db :memory:
+  execsql {
+    BEGIN;
+    CREATE TABLE abc(a, b, c);
+    INSERT INTO abc VALUES('abcdefghi', 1234567890, NULL);
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+    INSERT INTO abc SELECT * FROM abc;
+  }
+  sqlite3_release_memory
+} 0
+do_test malloc5-5.2 {
+  sqlite3_soft_heap_limit 5000
+  execsql {
+    COMMIT;
+    PRAGMA temp_store = memory;
+    SELECT * FROM abc ORDER BY a;
+  }
+  expr 1
+} {1}
+sqlite3_soft_heap_limit $::soft_limit
+
+#-------------------------------------------------------------------------
+# The following test cases (malloc5-6.*) test the new global LRU list
+# used to determine the pages to recycle when sqlite3_release_memory is
+# called and there is more than one pager open.
+#
+proc nPage {db} {
+  set bt [btree_from_db $db]
+  array set stats [btree_pager_stats $bt]
+  set stats(page)
+}
+db close
+file delete -force test.db test.db-journal test2.db test2.db-journal
+
+# This block of test-cases (malloc5-6.1.*) prepares two database files
+# for the subsequent tests.
+do_test malloc5-6.1.1 {
+  sqlite3 db test.db
+  execsql {
+    PRAGMA page_size=1024;
+    PRAGMA default_cache_size=10;
+  }
+  execsql {
+    PRAGMA temp_store = memory;
+    BEGIN;
+    CREATE TABLE abc(a PRIMARY KEY, b, c);
+    INSERT INTO abc VALUES(randstr(50,50), randstr(75,75), randstr(100,100));
+    INSERT INTO abc 
+        SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
+    INSERT INTO abc 
+        SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
+    INSERT INTO abc 
+        SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
+    INSERT INTO abc 
+        SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
+    INSERT INTO abc 
+        SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
+    INSERT INTO abc 
+        SELECT randstr(50,50), randstr(75,75), randstr(100,100) FROM abc;
+    COMMIT;
+  } 
+  copy_file test.db test2.db
+  sqlite3 db2 test2.db
+  list \
+    [expr ([file size test.db]/1024)>20] [expr ([file size test2.db]/1024)>20]
+} {1 1}
+do_test malloc5-6.1.2 {
+  list [execsql {PRAGMA cache_size}] [execsql {PRAGMA cache_size} db2]
+} {10 10}
+
+do_test malloc5-6.2.1 {
+  execsql {SELECT * FROM abc} db2
+  execsql {SELECT * FROM abc} db
+  expr [nPage db] + [nPage db2]
+} {20}
+
+do_test malloc5-6.2.2 {
+  # If we now try to reclaim some memory, it should come from the db2 cache.
+  sqlite3_release_memory 3000
+  expr [nPage db] + [nPage db2]
+} {17}
+do_test malloc5-6.2.3 {
+  # Access the db2 cache again, so that all the db2 pages have been used
+  # more recently than all the db pages. Then try to reclaim 3000 bytes.
+  # This time, 3 pages should be pulled from the db cache.
+  execsql { SELECT * FROM abc } db2
+  sqlite3_release_memory 3000
+  expr [nPage db] + [nPage db2]
+} {17}
+
+do_test malloc5-6.3.1 {
+  # Now open a transaction and update 2 pages in the db2 cache. Then
+  # do a SELECT on the db cache so that all the db pages are more recently
+  # used than the db2 pages. When we try to free memory, SQLite should
+  # free the non-dirty db2 pages, then the db pages, then finally use
+  # sync() to free up the dirty db2 pages. The only page that cannot be
+  # freed is page1 of db2. Because there is an open transaction, the
+  # btree layer holds a reference to page 1 in the db2 cache.
+  execsql {
+    BEGIN;
+    UPDATE abc SET c = randstr(100,100) 
+    WHERE rowid = 1 OR rowid = (SELECT max(rowid) FROM abc);
+  } db2
+  execsql { SELECT * FROM abc } db
+  expr [nPage db] + [nPage db2]
+} {20}
+do_test malloc5-6.3.2 {
+  # Try to release 7700 bytes. This should release all the 
+  # non-dirty pages held by db2.
+  sqlite3_release_memory [expr 7*1100]
+  list [nPage db] [nPage db2]
+} {10 3}
+do_test malloc5-6.3.3 {
+  # Try to release another 1000 bytes. This should come fromt the db
+  # cache, since all three pages held by db2 are either in-use or diry.
+  sqlite3_release_memory 1000
+  list [nPage db] [nPage db2]
+} {9 3}
+do_test malloc5-6.3.4 {
+  # Now release 9900 more (about 9 pages worth). This should expunge
+  # the rest of the db cache. But the db2 cache remains intact, because
+  # SQLite tries to avoid calling sync().
+  if {$::tcl_platform(wordSize)==8} {
+    sqlite3_release_memory 10177
+  } else {
+    sqlite3_release_memory 9900
+  }
+  list [nPage db] [nPage db2]
+} {0 3}
+do_test malloc5-6.3.5 {
+  # But if we are really insistent, SQLite will consent to call sync()
+  # if there is no other option. UPDATE: As of 3.6.2, SQLite will not
+  # call sync() in this scenario. So no further memory can be reclaimed.
+  sqlite3_release_memory 1000
+  list [nPage db] [nPage db2]
+} {0 3}
+do_test malloc5-6.3.6 {
+  # The referenced page (page 1 of the db2 cache) will not be freed no
+  # matter how much memory we ask for:
+  sqlite3_release_memory 31459
+  list [nPage db] [nPage db2]
+} {0 3}
+
+db2 close
+
+sqlite3_soft_heap_limit $::soft_limit
+finish_test
+catch {db close}