mirror of
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e600f9aebb
This commit updates default memory allocations size used with MEM_ROOT objects to minimize the number of calls to malloc(). Changes: - Updated MEM_ROOT block sizes in sql_const.h - Updated MALLOC_OVERHEAD to also take into account the extra memory allocated by my_malloc() - Updated init_alloc_root() to only take MALLOC_OVERHEAD into account as buffer size, not MALLOC_OVERHEAD + sizeof(USED_MEM). - Reset mem_root->first_block_usage if and only if first block was used. - Increase MEM_ROOT buffers sized used by my_load_defaults, plugin_init, Create_tmp_table, allocate_table_share, TABLE and TABLE_SHARE. This decreases number of malloc calls during queries. - Use a small buffer for THD->main_mem_root in THD::THD. This avoids multiple malloc() call for new connections. I tried the above changes on a complex select query with 12 tables. The following shows the number of extra allocations that where used to increase the size of the MEM_ROOT buffers. Original code: - Connection to MariaDB: 9 allocations - First query run: 146 allocations - Second query run: 24 allocations Max memory allocated for thd when using with heap table: 61,262,408 Max memory allocated for thd when using Aria tmp table: 419,464 After changes: Connection to MariaDB: 0 allocations - First run: 25 allocations - Second run: 7 allocations Max memory allocated for thd when using with heap table: 61,347,424 Max memory allocated for thd when using Aria table: 529,168 The new code uses slightly more memory, but avoids memory fragmentation and is slightly faster thanks to much fewer calls to malloc(). Reviewed-by: Sergei Golubchik <serg@mariadb.org> |
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| .. | ||
| crc32 | ||
| array.c | ||
| base64.c | ||
| ChangeLog | ||
| charset-def.c | ||
| charset.c | ||
| CMakeLists.txt | ||
| crc32ieee.cc | ||
| errors.c | ||
| file_logger.c | ||
| get_password.c | ||
| guess_malloc_library.c | ||
| hash.c | ||
| lf_alloc-pin.c | ||
| lf_dynarray.c | ||
| lf_hash.cc | ||
| list.c | ||
| ma_dyncol.c | ||
| mf_arr_appstr.c | ||
| mf_cache.c | ||
| mf_dirname.c | ||
| mf_fn_ext.c | ||
| mf_format.c | ||
| mf_getdate.c | ||
| mf_iocache.c | ||
| mf_iocache2.c | ||
| mf_keycache.c | ||
| mf_keycaches.c | ||
| mf_loadpath.c | ||
| mf_pack.c | ||
| mf_path.c | ||
| mf_qsort.c | ||
| mf_qsort2.c | ||
| mf_radix.c | ||
| mf_same.c | ||
| mf_sort.c | ||
| mf_soundex.c | ||
| mf_tempdir.c | ||
| mf_tempfile.c | ||
| mf_unixpath.c | ||
| mf_wcomp.c | ||
| mulalloc.c | ||
| my_access.c | ||
| my_addr_resolve.c | ||
| my_alarm.c | ||
| my_alloc.c | ||
| my_atomic_writes.c | ||
| my_basename.c | ||
| my_bit.c | ||
| my_bitmap.c | ||
| my_chmod.c | ||
| my_chsize.c | ||
| my_compare.c | ||
| my_compress.c | ||
| my_conio.c | ||
| my_copy.c | ||
| my_cpu.c | ||
| my_create.c | ||
| my_default.c | ||
| my_delete.c | ||
| my_div.c | ||
| my_dlerror.c | ||
| my_error.c | ||
| my_file.c | ||
| my_fopen.c | ||
| my_fstream.c | ||
| my_getexe.c | ||
| my_gethwaddr.c | ||
| my_getncpus.c | ||
| my_getopt.c | ||
| my_getpagesize.c | ||
| my_getsystime.c | ||
| my_getwd.c | ||
| my_init.c | ||
| my_largepage.c | ||
| my_lib.c | ||
| my_libwrap.c | ||
| my_likely.c | ||
| my_lock.c | ||
| my_lockmem.c | ||
| my_malloc.c | ||
| my_memmem.c | ||
| my_mess.c | ||
| my_minidump.cc | ||
| my_mkdir.c | ||
| my_mmap.c | ||
| my_new.cc | ||
| my_once.c | ||
| my_open.c | ||
| my_port.c | ||
| my_pread.c | ||
| my_pthread.c | ||
| my_quick.c | ||
| my_rdtsc.c | ||
| my_read.c | ||
| my_redel.c | ||
| my_rename.c | ||
| my_rnd.c | ||
| my_safehash.c | ||
| my_safehash.h | ||
| my_seek.c | ||
| my_setuser.c | ||
| my_sleep.c | ||
| my_stack.c | ||
| my_static.c | ||
| my_static.h | ||
| my_symlink.c | ||
| my_symlink2.c | ||
| my_sync.c | ||
| my_thr_init.c | ||
| my_uuid.c | ||
| my_win_popen.cc | ||
| my_wincond.c | ||
| my_winerr.c | ||
| my_winfile.c | ||
| my_winthread.c | ||
| my_wintoken.c | ||
| my_write.c | ||
| mysys_priv.h | ||
| psi_noop.c | ||
| ptr_cmp.c | ||
| queues.c | ||
| safemalloc.c | ||
| stacktrace.c | ||
| string.c | ||
| test_charset.c | ||
| test_dir.c | ||
| test_thr_mutex.c | ||
| test_xml.c | ||
| testhash.c | ||
| thr_alarm.c | ||
| thr_lock.c | ||
| thr_mutex.c | ||
| thr_rwlock.c | ||
| thr_timer.c | ||
| tree.c | ||
| typelib.c | ||
| waiting_threads.c | ||
| wqueue.c | ||