Reputation: 137
MariaDB using all available ram
On an computer with 64G of ram I have a mariadb server that uses all available ram even though it is (i think at least) configured to use much less:
SHOW VARIABLES
aria_block_size 8192
aria_checkpoint_interval 30
aria_checkpoint_log_activity 1048576
aria_encrypt_tables OFF
aria_force_start_after_recovery_failures 0
aria_group_commit none
aria_group_commit_interval 0
aria_log_file_size 1073741824
aria_log_purge_type immediate
aria_max_sort_file_size 9223372036853727232
aria_page_checksum ON
aria_pagecache_age_threshold 300
aria_pagecache_buffer_size 134217728
aria_pagecache_division_limit 100
aria_pagecache_file_hash_size 512
aria_recover NORMAL
aria_repair_threads 1
aria_sort_buffer_size 268434432
aria_stats_method nulls_unequal
aria_sync_log_dir NEWFILE
aria_used_for_temp_tables ON
auto_increment_increment 1
auto_increment_offset 1
autocommit ON
automatic_sp_privileges ON
back_log 152
basedir /usr
big_tables OFF
binlog_annotate_row_events OFF
binlog_cache_size 32768
binlog_checksum NONE
binlog_commit_wait_count 0
binlog_commit_wait_usec 100000
binlog_direct_non_transactional_updates OFF
binlog_format STATEMENT
binlog_optimize_thread_scheduling ON
binlog_row_image FULL
binlog_stmt_cache_size 32768
bulk_insert_buffer_size 8388608
character_set_client utf8mb4
character_set_connection utf8mb4
character_set_database utf8mb4
character_set_filesystem binary
character_set_results utf8mb4
character_set_server utf8mb4
character_set_system utf8
character_sets_dir /usr/share/mysql/charsets/
collation_connection utf8mb4_unicode_ci
collation_database utf8mb4_general_ci
collation_server utf8mb4_general_ci
completion_type NO_CHAIN
concurrent_insert AUTO
connect_timeout 10
core_file OFF
datadir /var/lib/mysql/
date_format %Y-%m-%d
datetime_format %Y-%m-%d %H:%i:%s
deadlock_search_depth_long 15
deadlock_search_depth_short 4
deadlock_timeout_long 50000000
deadlock_timeout_short 10000
debug_no_thread_alarm OFF
default_master_connection
default_regex_flags
default_storage_engine InnoDB
default_tmp_storage_engine
default_week_format 0
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
div_precision_increment 4
encrypt_binlog OFF
encrypt_tmp_disk_tables OFF
encrypt_tmp_files OFF
enforce_storage_engine
error_count 0
event_scheduler OFF
expensive_subquery_limit 100
expire_logs_days 10
explicit_defaults_for_timestamp OFF
external_user
extra_max_connections 1
extra_port 0
flush OFF
flush_time 0
foreign_key_checks ON
ft_boolean_syntax + -><()~*:""&|
ft_max_word_len 84
ft_min_word_len 4
ft_query_expansion_limit 20
ft_stopword_file (built-in)
general_log OFF
general_log_file prod4.log
group_concat_max_len 1024
gtid_binlog_pos
gtid_binlog_state
gtid_current_pos
gtid_domain_id 0
gtid_ignore_duplicates OFF
gtid_seq_no 0
gtid_slave_pos
gtid_strict_mode OFF
have_compress YES
have_crypt YES
have_dynamic_loading YES
have_geometry YES
have_openssl NO
have_profiling YES
have_query_cache YES
have_rtree_keys YES
have_ssl DISABLED
have_symlink YES
histogram_size 0
histogram_type SINGLE_PREC_HB
host_cache_size 628
hostname prod4
identity 0
ignore_builtin_innodb OFF
ignore_db_dirs
in_transaction 0
init_connect
init_file
init_slave
innodb_adaptive_flushing ON
innodb_adaptive_flushing_lwm 10.000000
innodb_adaptive_hash_index ON
innodb_adaptive_hash_index_partitions 1
innodb_adaptive_max_sleep_delay 150000
innodb_additional_mem_pool_size 8388608
innodb_api_bk_commit_interval 5
innodb_api_disable_rowlock OFF
innodb_api_enable_binlog OFF
innodb_api_enable_mdl OFF
innodb_api_trx_level 0
innodb_autoextend_increment 64
innodb_autoinc_lock_mode 1
innodb_background_scrub_data_check_interval 3600
innodb_background_scrub_data_compressed OFF
innodb_background_scrub_data_interval 604800
innodb_background_scrub_data_uncompressed OFF
innodb_buf_dump_status_frequency 0
innodb_buffer_pool_dump_at_shutdown OFF
innodb_buffer_pool_dump_now OFF
innodb_buffer_pool_dump_pct 100
innodb_buffer_pool_filename ib_buffer_pool
innodb_buffer_pool_instances 8
innodb_buffer_pool_load_abort OFF
innodb_buffer_pool_load_at_startup OFF
innodb_buffer_pool_load_now OFF
innodb_buffer_pool_populate OFF
innodb_buffer_pool_size 12884901888
innodb_change_buffer_max_size 25
innodb_change_buffering all
innodb_checksum_algorithm INNODB
innodb_checksums ON
innodb_cleaner_lsn_age_factor HIGH_CHECKPOINT
innodb_cmp_per_index_enabled OFF
innodb_commit_concurrency 0
innodb_compression_algorithm zlib
innodb_compression_failure_threshold_pct 5
innodb_compression_level 6
innodb_compression_pad_pct_max 50
innodb_concurrency_tickets 5000
innodb_corrupt_table_action assert
innodb_data_file_path ibdata1:12M:autoextend
innodb_data_home_dir
innodb_default_encryption_key_id 1
innodb_default_row_format compact
innodb_defragment OFF
innodb_defragment_fill_factor 0.900000
innodb_defragment_fill_factor_n_recs 20
innodb_defragment_frequency 40
innodb_defragment_n_pages 7
innodb_defragment_stats_accuracy 0
innodb_disable_sort_file_cache OFF
innodb_disallow_writes OFF
innodb_doublewrite ON
innodb_empty_free_list_algorithm BACKOFF
innodb_encrypt_log OFF
innodb_encrypt_tables OFF
innodb_encryption_rotate_key_age 1
innodb_encryption_rotation_iops 100
innodb_encryption_threads 0
innodb_fake_changes OFF
innodb_fast_shutdown 1
innodb_fatal_semaphore_wait_threshold 600
innodb_file_format Antelope
innodb_file_format_check ON
innodb_file_format_max Antelope
innodb_file_per_table ON
innodb_flush_log_at_timeout 1
innodb_flush_log_at_trx_commit 0
innodb_flush_method O_DIRECT
innodb_flush_neighbors 1
innodb_flushing_avg_loops 30
innodb_force_load_corrupted OFF
innodb_force_primary_key OFF
innodb_force_recovery 0
innodb_foreground_preflush EXPONENTIAL_BACKOFF
innodb_ft_aux_table
innodb_ft_cache_size 8000000
innodb_ft_enable_diag_print OFF
innodb_ft_enable_stopword ON
innodb_ft_max_token_size 84
innodb_ft_min_token_size 3
innodb_ft_num_word_optimize 2000
innodb_ft_result_cache_limit 2000000000
innodb_ft_server_stopword_table
innodb_ft_sort_pll_degree 2
innodb_ft_total_cache_size 640000000
innodb_ft_user_stopword_table
innodb_idle_flush_pct 100
innodb_immediate_scrub_data_uncompressed OFF
innodb_instrument_semaphores OFF
innodb_io_capacity 400
innodb_io_capacity_max 2000
innodb_kill_idle_transaction 0
innodb_large_prefix OFF
innodb_lock_schedule_algorithm fcfs
innodb_lock_wait_timeout 50
innodb_locking_fake_changes ON
innodb_locks_unsafe_for_binlog OFF
innodb_log_arch_dir ./
innodb_log_arch_expire_sec 0
innodb_log_archive OFF
innodb_log_block_size 512
innodb_log_buffer_size 8388608
innodb_log_checksum_algorithm INNODB
innodb_log_compressed_pages ON
innodb_log_file_size 1073741824
innodb_log_files_in_group 2
innodb_log_group_home_dir ./
innodb_lru_scan_depth 1024
innodb_max_bitmap_file_size 104857600
innodb_max_changed_pages 1000000
innodb_max_dirty_pages_pct 75.000000
innodb_max_dirty_pages_pct_lwm 0.001000
innodb_max_purge_lag 0
innodb_max_purge_lag_delay 0
innodb_mirrored_log_groups 1
innodb_monitor_disable
innodb_monitor_enable
innodb_monitor_reset
innodb_monitor_reset_all
innodb_mtflush_threads 8
innodb_old_blocks_pct 37
innodb_old_blocks_time 1000
innodb_online_alter_log_max_size 134217728
innodb_open_files 400
innodb_optimize_fulltext_only OFF
innodb_page_size 16384
innodb_prefix_index_cluster_optimization OFF
innodb_print_all_deadlocks OFF
innodb_print_lock_wait_timeout_info OFF
innodb_purge_batch_size 300
innodb_purge_threads 1
innodb_random_read_ahead OFF
innodb_read_ahead_threshold 56
innodb_read_io_threads 64
innodb_read_only OFF
innodb_replication_delay 0
innodb_rollback_on_timeout OFF
innodb_rollback_segments 128
innodb_sched_priority_cleaner 19
innodb_scrub_log OFF
innodb_scrub_log_speed 256
innodb_show_locks_held 10
innodb_show_verbose_locks 0
innodb_simulate_comp_failures 0
innodb_sort_buffer_size 1048576
innodb_spin_wait_delay 6
innodb_stats_auto_recalc ON
innodb_stats_include_delete_marked OFF
innodb_stats_method nulls_equal
innodb_stats_modified_counter 0
innodb_stats_on_metadata OFF
innodb_stats_persistent ON
innodb_stats_persistent_sample_pages 20
innodb_stats_sample_pages 8
innodb_stats_traditional ON
innodb_stats_transient_sample_pages 8
innodb_status_output OFF
innodb_status_output_locks OFF
innodb_strict_mode OFF
innodb_support_xa ON
innodb_sync_array_size 1
innodb_sync_spin_loops 30
innodb_table_locks ON
innodb_thread_concurrency 0
innodb_thread_sleep_delay 10000
innodb_tmpdir
innodb_track_changed_pages OFF
innodb_undo_directory .
innodb_undo_logs 128
innodb_undo_tablespaces 0
innodb_use_atomic_writes OFF
innodb_use_fallocate OFF
innodb_use_global_flush_log_at_trx_commit ON
innodb_use_mtflush OFF
innodb_use_native_aio ON
innodb_use_stacktrace OFF
innodb_use_sys_malloc ON
innodb_use_trim OFF
innodb_version 5.6.42-84.2
innodb_write_io_threads 4
insert_id 0
interactive_timeout 28800
join_buffer_size 262144
join_buffer_space_limit 2097152
join_cache_level 2
keep_files_on_create OFF
key_buffer_size 33554432
key_cache_age_threshold 300
key_cache_block_size 1024
key_cache_division_limit 100
key_cache_file_hash_size 512
key_cache_segments 0
large_files_support ON
large_page_size 0
large_pages OFF
last_gtid
last_insert_id 0
lc_messages en_US
lc_messages_dir /usr/share/mysql
lc_time_names en_US
license GPL
local_infile ON
lock_wait_timeout 31536000
locked_in_memory OFF
log_bin OFF
log_bin_basename
log_bin_index
log_bin_trust_function_creators OFF
log_error /var/log/mysql/error.log
log_output FILE
log_queries_not_using_indexes OFF
log_slave_updates OFF
log_slow_admin_statements OFF
log_slow_filter admin,filesort,filesort_on_disk,full_join,full_sca...
log_slow_rate_limit 1
log_slow_slave_statements OFF
log_slow_verbosity
log_tc_size 24576
log_warnings 1
long_query_time 10.000000
low_priority_updates OFF
lower_case_file_system OFF
lower_case_table_names 0
master_verify_checksum OFF
max_allowed_packet 16777216
max_binlog_cache_size 18446744073709547520
max_binlog_size 104857600
max_binlog_stmt_cache_size 18446744073709547520
max_connect_errors 100
max_connections 512
max_delayed_threads 20
max_digest_length 1024
max_error_count 64
max_heap_table_size 16777216
max_insert_delayed_threads 20
max_join_size 18446744073709551615
max_length_for_sort_data 1024
max_long_data_size 16777216
max_prepared_stmt_count 16382
max_relay_log_size 104857600
max_seeks_for_key 4294967295
max_session_mem_used 9223372036854775807
max_sort_length 1024
max_sp_recursion_depth 0
max_statement_time 0.000000
max_tmp_tables 32
max_user_connections 0
max_write_lock_count 4294967295
metadata_locks_cache_size 1024
metadata_locks_hash_instances 8
min_examined_row_limit 0
mrr_buffer_size 262144
multi_range_count 256
myisam_block_size 1024
myisam_data_pointer_size 6
myisam_max_sort_file_size 9223372036853727232
myisam_mmap_size 18446744073709551615
myisam_recover_options BACKUP
myisam_repair_threads 1
myisam_sort_buffer_size 134216704
myisam_stats_method NULLS_UNEQUAL
myisam_use_mmap OFF
mysql56_temporal_format ON
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
old OFF
old_alter_table OFF
old_mode
old_passwords OFF
open_files_limit 8551
optimizer_prune_level 1
optimizer_search_depth 62
optimizer_selectivity_sampling_limit 100
optimizer_switch index_merge=on,index_merge_union=on,index_merge_so...
optimizer_use_condition_selectivity 1
performance_schema ON
performance_schema_accounts_size 100
performance_schema_digests_size 10000
performance_schema_events_stages_history_long_size 10000
performance_schema_events_stages_history_size 10
performance_schema_events_statements_history_long_... 10000
performance_schema_events_statements_history_size 10
performance_schema_events_waits_history_long_size 10000
performance_schema_events_waits_history_size 10
performance_schema_hosts_size 100
performance_schema_max_cond_classes 80
performance_schema_max_cond_instances 3348
performance_schema_max_digest_length 1024
performance_schema_max_file_classes 50
performance_schema_max_file_handles 32768
performance_schema_max_file_instances 3077
performance_schema_max_mutex_classes 200
performance_schema_max_mutex_instances 10072
performance_schema_max_rwlock_classes 40
performance_schema_max_rwlock_instances 5024
performance_schema_max_socket_classes 10
performance_schema_max_socket_instances 1044
performance_schema_max_stage_classes 150
performance_schema_max_statement_classes 178
performance_schema_max_table_handles 4000
performance_schema_max_table_instances 12500
performance_schema_max_thread_classes 50
performance_schema_max_thread_instances 1124
performance_schema_session_connect_attrs_size 512
performance_schema_setup_actors_size 100
performance_schema_setup_objects_size 100
performance_schema_users_size 100
pid_file /var/run/mysqld/mysqld.pid
plugin_dir /usr/lib/x86_64-linux-gnu/mariadb18/plugin/
plugin_maturity unknown
port 3306
preload_buffer_size 32768
profiling OFF
profiling_history_size 15
progress_report_time 5
protocol_version 10
proxy_user
pseudo_slave_mode OFF
pseudo_thread_id 16370
query_alloc_block_size 16384
query_cache_limit 16777216
query_cache_min_res_unit 4096
query_cache_size 0
query_cache_strip_comments OFF
query_cache_type OFF
query_cache_wlock_invalidate OFF
query_prealloc_size 24576
rand_seed1 357956615
rand_seed2 975103936
range_alloc_block_size 4096
read_buffer_size 131072
read_only OFF
read_rnd_buffer_size 262144
relay_log
relay_log_basename
relay_log_index
relay_log_info_file relay-log.info
relay_log_purge ON
relay_log_recovery OFF
relay_log_space_limit 0
replicate_annotate_row_events OFF
replicate_do_db
replicate_do_table
replicate_events_marked_for_skip REPLICATE
replicate_ignore_db
replicate_ignore_table
replicate_wild_do_table
replicate_wild_ignore_table
report_host
report_password
report_port 3306
report_user
rowid_merge_buff_size 8388608
secure_auth ON
secure_file_priv
server_id 0
skip_external_locking ON
skip_name_resolve OFF
skip_networking OFF
skip_parallel_replication OFF
skip_replication OFF
skip_show_database OFF
slave_compressed_protocol OFF
slave_ddl_exec_mode IDEMPOTENT
slave_domain_parallel_threads 0
slave_exec_mode STRICT
slave_load_tmpdir /tmp
slave_max_allowed_packet 1073741824
slave_net_timeout 3600
slave_parallel_max_queued 131072
slave_parallel_mode conservative
slave_parallel_threads 0
slave_run_triggers_for_rbr NO
slave_skip_errors OFF
slave_sql_verify_checksum ON
slave_transaction_retries 10
slave_type_conversions
slow_launch_time 2
slow_query_log OFF
slow_query_log_file prod4-slow.log
socket /var/run/mysqld/mysqld.sock
sort_buffer_size 2097152
sql_auto_is_null OFF
sql_big_selects ON
sql_buffer_result OFF
sql_log_bin ON
sql_log_off OFF
sql_mode NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
sql_notes ON
sql_quote_show_create ON
sql_safe_updates OFF
sql_select_limit 18446744073709551615
sql_slave_skip_counter 0
sql_warnings OFF
ssl_ca
ssl_capath
ssl_cert
ssl_cipher
ssl_crl
ssl_crlpath
ssl_key
storage_engine InnoDB
stored_program_cache 256
strict_password_validation ON
sync_binlog 0
sync_frm ON
sync_master_info 10000
sync_relay_log 10000
sync_relay_log_info 10000
system_time_zone UTC
table_definition_cache 400
table_open_cache 4000
thread_cache_size 8
thread_concurrency 10
thread_handling one-thread-per-connection
thread_pool_idle_timeout 60
thread_pool_max_threads 1000
thread_pool_oversubscribe 3
thread_pool_size 8
thread_pool_stall_limit 500
thread_stack 196608
time_format %H:%i:%s
time_zone SYSTEM
timed_mutexes OFF
timestamp 1561288673.757972
tmp_table_size 16777216
tmpdir /tmp
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
tx_isolation REPEATABLE-READ
tx_read_only OFF
unique_checks ON
updatable_views_with_limit YES
use_stat_tables NEVER
userstat OFF
version 10.1.38-MariaDB-0ubuntu0.18.10.2
version_comment Ubuntu 18.10
version_compile_machine x86_64
version_compile_os debian-linux-gnu
version_malloc_library system jemalloc
version_ssl_library YaSSL 2.4.4
wait_timeout 28800
warning_count 0
wsrep_osu_method TOI
wsrep_auto_increment_control ON
wsrep_causal_reads OFF
wsrep_certification_rules strict
wsrep_certify_nonpk ON
wsrep_cluster_address
wsrep_cluster_name my_wsrep_cluster
wsrep_convert_lock_to_trx OFF
wsrep_data_home_dir /var/lib/mysql/
wsrep_dbug_option
wsrep_debug OFF
wsrep_desync OFF
wsrep_dirty_reads OFF
wsrep_drupal_282555_workaround OFF
wsrep_forced_binlog_format NONE
wsrep_gtid_domain_id 0
wsrep_gtid_mode OFF
wsrep_load_data_splitting ON
wsrep_log_conflicts OFF
wsrep_max_ws_rows 0
wsrep_max_ws_size 2147483647
wsrep_mysql_replication_bundle 0
wsrep_node_address
wsrep_node_incoming_address AUTO
wsrep_node_name prod4
wsrep_notify_cmd
wsrep_on OFF
wsrep_patch_version wsrep_25.24
wsrep_provider none
wsrep_provider_options
wsrep_recover OFF
wsrep_reject_queries NONE
wsrep_replicate_myisam OFF
wsrep_restart_slave OFF
wsrep_retry_autocommit 1
wsrep_slave_fk_checks ON
wsrep_slave_uk_checks OFF
wsrep_slave_threads 1
wsrep_sst_auth
wsrep_sst_donor
wsrep_sst_donor_rejects_queries OFF
wsrep_sst_method rsync
wsrep_sst_receive_address AUTO
wsrep_start_position 00000000-0000-0000-0000-000000000000:-1
wsrep_sync_wait 0
Output of tuning-primer also seems fine:
INNODB STATUS
Current InnoDB index space = 42.05 G
Current InnoDB data space = 48.17 G
Current InnoDB buffer pool free = 40 %
Current innodb_buffer_pool_size = 12.00 G
Depending on how much space your innodb indexes take up it may be safe
to increase this value to up to 2 / 3 of total system memory
MEMORY USAGE
Max Memory Ever Allocated : 12.16 G
Configured Max Per-thread Buffers : 1.40 G
Configured Max Global Buffers : 12.04 G
Configured Max Memory Limit : 13.45 G
Physical Memory : 62.79 G
Max memory limit seem to be within acceptable norms
After a few hours the output of top look like this:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
26350 mysql 20 0 64.3g 55.3g 19300 S 29.9 88.0 354:20.10 /usr/sbin/mysqld
shortly after this oom_reaper would kill mysql:
[3308788.693609] Out of memory: Kill process 30421 (mysqld) score 915 or sacrifice child
[3308788.693727] Killed process 30421 (mysqld) total-vm:78894468kB, anon-rss:64508740kB, file-rss:0kB, shmem-rss:0kB
[3308790.493095] oom_reaper: reaped process 30421 (mysqld), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Im using 10.1.38-MariaDB-0ubuntu0.18.10.2 on ubuntu 18.10
Pretty much all of the table are innodb, result from show global status is here: https://pastebin.com/7ayJBpgC
New settings, after changing some settings as Rick James suggested: https://pastebin.com/N55AzWFw
Upvotes: 0
Views: 4155
Answers (3)
Reputation: 2343
Rate Per Second=RPS - Suggestions to consider for your my.cnf [mysqld] section
thread_cache_size=256 # from 50 per 10.n.nn MaridDB refman minimum
innodb_io_capacity=1900 # from 400 to enable higher SSD IOPS
innodb_lru_scan_depth=100 # from 1024 to conserve 90% of CPU cycles used for function
innodb_buffer_pool_size=24G # from 12G to reduce innodb_buffer_pool_reads RPS of 14
innodb_flushing_avg_loops=5 # from 30 to reduce innodb_buffer_pool_pages_dirty of 61,297
Disclaimer: I am the content author of website mentioned on my profile, Network profile where we have free Utility Scripts to improve performance and additional suggestions.
Upvotes: 1
Reputation: 137
After Rick James suggesting that some default settings are weird I decided to upgrade to official (1:10.2.25+maria~cosmic) instead of ubuntu distributed packages and the memory problem seems to have gone away without any changes to config.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2736 mysql 20 0 27.4g 15.0g 22624 S 141.7 23.9 384:24.58 /usr/sbin/mysqld
current variables: https://pastebin.com/7C96E6J4
current status: https://pastebin.com/G55ydpJy
Additional data as requested by Wilson Hauck:
we are using 2x Samsung SSD 850 EVO 500GB in raid 1 on on an i7-6700K
iostat -xm 5 3:
Linux 4.18.0-20-generic (prod4) 07/04/2019 _x86_64_ (8 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
7.10 0.08 1.43 1.53 0.00 89.86
Device r/s w/s rMB/s wMB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
sdb 6.35 205.97 0.41 4.21 1.79 63.35 21.94 23.52 0.33 1.85 0.67 66.31 20.92 1.19 25.22
sda 14.63 205.95 0.70 4.17 2.58 62.76 14.98 23.36 0.19 1.43 0.58 48.67 20.73 1.06 23.46
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.47 489.75 0.00 0.00
md2 19.86 232.03 0.84 4.23 0.00 0.00 0.00 0.00 0.00 0.00 0.00 43.43 18.65 0.00 0.00
md1 1.33 2.51 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.00 4.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
9.38 0.00 1.61 2.18 0.00 86.83
Device r/s w/s rMB/s wMB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
sdb 0.00 352.80 0.00 6.88 0.00 57.60 0.00 14.04 0.00 0.26 0.40 0.00 19.97 0.88 31.12
sda 0.00 353.00 0.00 6.88 0.00 57.40 0.00 13.99 0.00 0.26 0.39 0.00 19.96 0.86 30.48
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md2 0.00 370.80 0.00 6.87 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 18.98 0.00 0.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
8.00 0.00 1.69 2.16 0.00 88.14
Device r/s w/s rMB/s wMB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util
sdb 0.00 387.60 0.00 7.49 0.00 76.20 0.00 16.43 0.00 0.24 0.42 0.00 19.78 0.83 32.16
sda 0.00 387.60 0.00 7.49 0.00 76.20 0.00 16.43 0.00 0.31 0.42 0.00 19.78 0.82 31.60
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md2 0.00 422.20 0.00 7.48 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 18.15 0.00 0.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Upvotes: 1
Reputation: 142518
Analysis of GLOBAL STATUS and VARIABLES. Alas, nothing clearly points to why you are having that Memory problem.
Observations:
- Version: 10.1.38-MariaDB-0ubuntu0.18.10.2
- 64 GB of RAM
- Uptime = 10:28:11; some GLOBAL STATUS values may not be meaningful yet.
- You are not running on Windows.
- Running 64-bit version
- You appear to be running entirely (or mostly) InnoDB.
The More Important Issues:
thread_cache_size -- Increase to 50.
long_query_time = 1 and turn on the slowlog. More discussion: http://mysql.rjweb.org/doc.php/mysql_analysis#slow_queries_and_slowlog There are multiple signs of queries that may need improving -- perhaps better indexing, perhaps better formulation. The slowlog will help us locate which ones to focus on.
Is this server part of a Galera cluster? I may have further questions or comments depending on the answer.
Max_used_connections reached 199. This is rather high. Hopefully tackling the slow queries will bring this down.
Details and other observations:
( (key_buffer_size / 0.20 + innodb_buffer_pool_size / 0.70) / _ram ) = (32M / 0.20 + 12288M / 0.70) / 65536M = 27.0% -- Most of available ram should be made available for caching.
-- http://mysql.rjweb.org/doc.php/memory
( table_open_cache ) = 4,000 -- Number of table descriptors to cache
-- 700 might be good in your case. (Open_tables = 535)
( innodb_lru_scan_depth ) = 1,024
-- "InnoDB: page_cleaner: 1000ms intended loop took ..." may be fixed by lowering lru_scan_depth
( Innodb_os_log_written ) = 8,213,856,256 / 37691 = 217926 /sec -- This is an indicator of how busy InnoDB is.
-- Very busy InnoDB.
( Innodb_rows_deleted / Innodb_rows_inserted ) = 1,085,550 / 1658210 = 0.655 -- Churn
-- "Don't queue it, just do it." (If MySQL is being used as a queue.)
( Innodb_row_lock_waits ) = 9,462 / 37691 = 0.25 /sec -- How often there is a delay in getting a row lock.
-- May be caused by complex queries that could be optimized.
( innodb_flush_neighbors ) = 1 -- A minor optimization when writing blocks to disk.
-- Use 0 for SSD drives; 1 for HDD.
( sync_binlog ) = 0 -- Use 1 for added security, at some cost of I/O =1 may lead to lots of "query end"; =0 may lead to "binlog at impossible position" and lose transactions in a crash, but is faster.
( innodb_thread_concurrency ) = 0 -- 0 = Let InnoDB decide the best for concurrency_tickets.
-- Set to 0 or 64. This may cut back on CPU.
( innodb_print_all_deadlocks ) = innodb_print_all_deadlocks = OFF -- Whether to log all Deadlocks.
-- If you are plagued with Deadlocks, turn this on. Caution: If you have lots of deadlocks, this may write a lot to disk.
( local_infile ) = local_infile = ON
-- local_infile = ON is a potential security issue
( Created_tmp_disk_tables ) = 100,172 / 37691 = 2.7 /sec -- Frequency of creating disk "temp" tables as part of complex SELECTs
-- increase tmp_table_size and max_heap_table_size.
Check the rules for temp tables on when MEMORY is used instead of MyISAM. Perhaps minor schema or query changes can avoid MyISAM.
Better indexes and reformulation of queries are more likely to help.
( Select_full_join ) = 228,142 / 37691 = 6.1 /sec -- joins without index
-- Add suitable index(es) to tables used in JOINs.
( Select_scan ) = 451,720 / 37691 = 12 /sec -- full table scans
-- Add indexes / optimize queries (unless they are tiny tables)
( Select_scan / Com_select ) = 451,720 / 4944883 = 9.1% -- % of selects doing full table scan. (May be fooled by Stored Routines.)
-- Add indexes / optimize queries
( Sort_merge_passes ) = 7,711 / 37691 = 0.2 /sec -- Heafty sorts
-- Increase sort_buffer_size and/or optimize complex queries.
( Com_insert + Com_delete + Com_delete_multi + Com_replace + Com_update + Com_update_multi ) = (2323860 + 36898 + 0 + 0 + 2307510 + 3) / 37691 = 123 /sec -- writes/sec
-- 50 writes/sec + log flushes will probably max out I/O write capacity of normal drives
( binlog_format ) = binlog_format = STATEMENT -- STATEMENT/ROW/MIXED. ROW is preferred; it may become the default.
( wsrep_on ) = wsrep_on = OFF -- Galera: Turn on Replication
-- Why is it OFF?
( innodb_autoinc_lock_mode ) = 1 -- Galera: desires 2 -- 2 = "interleaved"; 1 = "consecutive" is typical; 0 = "traditional".
( wsrep_log_conflicts ) = wsrep_log_conflicts = OFF -- If you get deadlock conflicts during COMMIT, this flag can be helpful.
( slow_query_log ) = slow_query_log = OFF -- Whether to log slow queries. (5.1.12)
( long_query_time ) = 10 -- Cutoff (Seconds) for defining a "slow" query.
-- Suggest 2
( Connections ) = 619,511 / 37691 = 16 /sec -- Connections
-- Increase wait_timeout; use pooling?
( Threads_created / Connections ) = 17,071 / 619511 = 2.8% -- Rapidity of process creation
( thread_cache_size / max_connections ) = 8 / 512 = 1.6%
-- Increase thread_cache_size (non-Windows)
Abnormally small:
Acl_database_grants = 3
Acl_users = 5
Aria_pagecache_blocks_unused = 13,617
Innodb_background_log_sync = 36,995
Innodb_log_writes / Innodb_log_write_requests = 0.20%
Innodb_master_thread_idle_loops = 512
Memory_used = 179.5MB
Abnormally large:
Aria_pagecache_write_requests = 682 /sec
Aria_pagecache_writes = 270 /sec
Aria_transaction_log_syncs = 1,238
Com_show_binlogs = 12 /HR
Com_show_engine_status = 83 /HR
Com_show_plugins = 83 /HR
Feature_locale = 3.1 /HR
Handler_delete = 74 /sec
Handler_discover = 5 /HR
Handler_icp_attempts = 60233 /sec
Handler_icp_match = 59945 /sec
Handler_tmp_update = 5583 /sec
Handler_tmp_write = 11043 /sec
Innodb_buffer_pool_bytes_data = 296959 /sec
Innodb_buffer_pool_pages_dirty = 61,297
Innodb_buffer_pool_write_requests = 5262 /sec
Innodb_ibuf_merged_deletes = 0.32 /sec
Innodb_rows_updated = 358 /sec
Rows_tmp_read = 7844 /sec
Select_range = 59 /sec
Select_range / Com_select = 44.7%
Sort_rows = 9375 /sec
Tc_log_page_size = 4,096
Update_scan = 123,123
innodb_read_io_threads = 64
max_relay_log_size = 100MB
Abnormal strings:
innodb_default_row_format = compact
innodb_fast_shutdown = 1
myisam_stats_method = NULLS_UNEQUAL
Changes made by OP
innodb_flush_neighbors 1 | innodb_flush_neighbors 0
long_query_time 10.000000 | long_query_time 1.000000
open_files_limit 8551 | open_files_limit 2565
pseudo_thread_id 16370 | pseudo_thread_id 32010
rand_seed1 357956615 | rand_seed1 386239716
rand_seed2 975103936 | rand_seed2 465882405
slow_query_log OFF | slow_query_log ON
slow_query_log_file prod4-slo | slow_query_log_file /var/
table_open_cache 4000 | table_open_cache 700
thread_cache_size 8 | thread_cache_size 50
timestamp 1561288673.757972 | timestamp 1561333380.04
Upvotes: 1
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