sqlite/test/memsubsys1.test

# 2008 June 18
#
# 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 tests of the memory allocation subsystem
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
sqlite3_reset_auto_extension

# This test assumes that no page-cache or scratch buffers are installed
# by default when a new database connection is opened. As a result, it
# will not work with the "memsubsys1" permutation.
#
if {[permutation] == "memsubsys1"} {
  finish_test
  return
}

test_set_config_pagecache 0 0

# This procedure constructs a new database in test.db.  It fills
# this database with many small records (enough to force multiple
# rebalance operations in the btree-layer and to require a large
# page cache), verifies correct results, then returns.
#
proc build_test_db {testname pragmas} {
  catch {db close}
  forcedelete test.db test.db-journal
  sqlite3 db test.db
  sqlite3_db_config_lookaside db 0 0 0
  db eval $pragmas
  db eval {
    CREATE TABLE t1(x, y);
    CREATE TABLE t2(a, b);
    CREATE INDEX i1 ON t1(x,y);
    INSERT INTO t1 VALUES(1, 100);
    INSERT INTO t1 VALUES(2, 200);
  }
  for {set i 2} {$i<5000} {incr i $i} {
    db eval {INSERT INTO t2 SELECT * FROM t1}
    db eval {INSERT INTO t1 SELECT a+$i, a+b*100 FROM t2}
    db eval {DELETE FROM t2}
  }
  do_test $testname.1 {
    db eval {SELECT count(*) FROM t1}
  } 8192
  integrity_check $testname.2
}

# Reset all of the highwater marks.
#
proc reset_highwater_marks {} {
  sqlite3_status SQLITE_STATUS_MEMORY_USED 1
  sqlite3_status SQLITE_STATUS_MALLOC_SIZE 1
  sqlite3_status SQLITE_STATUS_PAGECACHE_USED 1
  sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 1
  sqlite3_status SQLITE_STATUS_PAGECACHE_SIZE 1
  sqlite3_status SQLITE_STATUS_SCRATCH_USED 1
  sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 1
  sqlite3_status SQLITE_STATUS_SCRATCH_SIZE 1
  sqlite3_status SQLITE_STATUS_PARSER_STACK 1
}

set xtra_size 290

# Test 1:  Both PAGECACHE and SCRATCH are shut down.
#
db close
sqlite3_shutdown
sqlite3_config_lookaside 0 0
sqlite3_config_pagecache 0 0
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-1 {PRAGMA page_size=1024}
do_test memsubsys1-1.3 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
} 0
do_test memsubsys1-1.4 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 0
set max_pagecache [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 0] 2]
#show_memstats

# Test 2:  Activate PAGECACHE with 20 pages
#
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 1024+$xtra_size] 20
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-2 {PRAGMA page_size=1024; PRAGMA mmap_size=0}
#show_memstats
set MEMORY_MANAGEMENT $sqlite_options(memorymanage)
ifcapable pagecache_overflow_stats {
  ifcapable !malloc_usable_size {
    do_test memsubsys1-2.3 {
      set pg_ovfl [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 0] 2]
    } [expr ($TEMP_STORE>1 || $MEMORY_MANAGEMENT==0)*1024]
  }
}
do_test memsubsys1-2.4 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
} 20
do_test memsubsys1-2.5 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 0

# Test 3:  Activate PAGECACHE with 20 pages but use the wrong page size
# so that PAGECACHE is not used.
#
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 512+$xtra_size] 20
sqlite3_config singlethread
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-3.1 {PRAGMA page_size=1024}
do_test memsubsys1-3.1.3 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
} 0
do_test memsubsys1-3.1.4 {
  set overflow [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 0] 2]
  # Note:  The measured PAGECACHE_OVERFLOW is amount malloc() returns, not what
  # was requested.  System malloc() implementations might (arbitrarily) return
  # slightly different oversize buffers, which can result in slightly different
  # PAGECACHE_OVERFLOW sizes between consecutive runs.  So we cannot do an
  # exact comparison.  Simply verify that the amount is within 5%.
  expr {$overflow>=$max_pagecache*0.95 && $overflow<=$max_pagecache*1.05}
} 1
do_test memsubsys1-3.1.5 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 0
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 2048+$xtra_size] 20
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-3.2 {PRAGMA page_size=2048}
#show_memstats
do_test memsubsys1-3.2.3 {
  db eval {PRAGMA page_size}
} 2048
do_test memsubsys1-3.2.4 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
} 20
do_test memsubsys1-3.2.5 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 0

# Test 4:  Activate both PAGECACHE and SCRATCH.
#
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 1024+$xtra_size] 50
sqlite3_config_scratch 6000 2
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-4 {PRAGMA page_size=1024}
#show_memstats
do_test memsubsys1-4.3 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
  expr {$pg_used>=45 && $pg_used<=50}
} 1
do_test memsubsys1-4.4 {
  set pg_ovfl [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 0] 2]
} 0
do_test memsubsys1-4.5 {
  set maxreq [lindex [sqlite3_status SQLITE_STATUS_MALLOC_SIZE 0] 2]
  expr {$maxreq<7000}
} 1
do_test memsubsys1-4.6 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 1

# Test 5:  Activate both PAGECACHE and SCRATCH.  But make the page size is
# such that the SCRATCH allocations are too small.
#
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 4096+$xtra_size] 24
sqlite3_config_scratch 4000 2
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-5 {PRAGMA page_size=4096}
#show_memstats
do_test memsubsys1-5.3 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
} {/^2[34]$/}
do_test memsubsys1-5.4 {
  set maxreq [lindex [sqlite3_status SQLITE_STATUS_MALLOC_SIZE 0] 2]
  expr {$maxreq>4096}
} 1
do_test memsubsys1-5.5 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 0
do_test memsubsys1-5.6 {
  set s_ovfl [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 0] 2]
  expr {$s_ovfl>6000}
} 1

# Test 6:  Activate both PAGECACHE and SCRATCH with a 4k page size.
# Make it so that SCRATCH is large enough
#
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 4096+$xtra_size] 24
sqlite3_config_scratch 25300 1
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-6 {PRAGMA page_size=4096}
#show_memstats
do_test memsubsys1-6.3 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
} {/^2[34]$/}
#do_test memsubsys1-6.4 {
#  set maxreq [lindex [sqlite3_status SQLITE_STATUS_MALLOC_SIZE 0] 2]
#  expr {$maxreq>4096 && $maxreq<=(4096+$xtra_size)}
#} 1
do_test memsubsys1-6.5 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 1
do_test memsubsys1-6.6 {
  set s_ovfl [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 0] 2]
} 0

# Test 7:  Activate both PAGECACHE and SCRATCH with a 4k page size.
# Set cache_size small so that no PAGECACHE overflow occurs.  Verify
# that maximum allocation size is small.
#
db close
sqlite3_shutdown
sqlite3_config_pagecache [expr 4096+$xtra_size] 24
sqlite3_config_scratch 25300 1
sqlite3_initialize
reset_highwater_marks
build_test_db memsubsys1-7 {
  PRAGMA page_size=4096;
  PRAGMA cache_size=10;
  PRAGMA temp_store=memory;
}
#show_memstats
do_test memsubsys1-7.3 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_USED 0] 2]
  expr {$pg_used<24}
} 1
do_test memsubsys1-7.4 {
  set pg_ovfl [lindex [sqlite3_status SQLITE_STATUS_PAGECACHE_OVERFLOW 0] 2]
} 0
do_test memsubsys1-7.5 {
  set maxreq [lindex [sqlite3_status SQLITE_STATUS_MALLOC_SIZE 0] 2]
  expr {$maxreq<4100 + 4200*[nonzero_reserved_bytes]}
} 1
do_test memsubsys1-7.6 {
  set s_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 1
do_test memsubsys1-7.7 {
  set s_ovfl [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 0] 2]
} 0

# Test 8:  Disable PAGECACHE.  Make available SCRATCH zero.  Verify that
# the SCRATCH overflow logic works.
#
db close
sqlite3_shutdown
sqlite3_config_pagecache 0 0
sqlite3_config_scratch 25000 0
sqlite3_initialize
reset_highwater_marks
do_test memsubsys1-8.1 {
  set pg_used [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_USED 0] 2]
} 0
do_test memsubsys1-8.2 {
  set s_ovfl [lindex [sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 0] 2]
} 0
do_test memsubsys1-8.3 {
  sqlite3 db :memory:
  db eval {
    CREATE TABLE t1(x);
    INSERT INTO t1 VALUES(zeroblob(400));
    INSERT INTO t1 VALUES(zeroblob(400));
    INSERT INTO t1 SELECT * FROM t1;
    INSERT INTO t1 SELECT * FROM t1;
    INSERT INTO t1 SELECT * FROM t1;
  }
  expr {[lindex [sqlite3_status SQLITE_STATUS_SCRATCH_OVERFLOW 0] 2]>0}
} 1
db close
sqlite3_shutdown
sqlite3_config_memstatus 0
sqlite3_initialize
do_test memsubsys1-8.4 {
  sqlite3 db :memory:
  db eval {
    CREATE TABLE t1(x);
    INSERT INTO t1 VALUES(zeroblob(400));
    INSERT INTO t1 VALUES(zeroblob(400));
    INSERT INTO t1 SELECT * FROM t1;
    INSERT INTO t1 SELECT * FROM t1;
    INSERT INTO t1 SELECT * FROM t1;
    SELECT rowid FROM t1;
  }
} {1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16}


db close
sqlite3_shutdown
sqlite3_config_memstatus 1
sqlite3_config_scratch 0 0
sqlite3_config_lookaside 100 500
sqlite3_config serialized
sqlite3_initialize
autoinstall_test_functions

test_restore_config_pagecache
finish_test