dataset size: 1000000 rows. 5 int cols. 7 char cols
I run mysqlslap for 99 concurrent clients ( out of 100 max)
Container memory is limited to 5.268G
Query cache configuration is default, i didn't try to change it
Why MyISAM engine is more suitable in resource constrained env? What's the cons of using it?

Below is my "my.cnf":
# MariaDB database server configuration file.
#
# You can copy this file to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0

[mysqld]
skip-host-cache
skip-name-resolve
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc_messages_dir  = /usr/share/mysql
lc_messages = en_US
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address = 127.0.0.1
#
# * Fine Tuning
#
max_connections  = 100
connect_timeout  = 5
wait_timeout = 600
max_allowed_packet  = 16M
thread_cache_size       = 128
sort_buffer_size  = 4M
bulk_insert_buffer_size
= 16M
tmp_table_size = 32M
max_heap_table_size  = 32M
#
# * MyISAM
#
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched. On error, make copy and try a repair.
myisam_recover_options = BACKUP
key_buffer_size  = 128M
#open-files-limit  = 2000
table_open_cache  = 400
myisam_sort_buffer_size
= 512M
concurrent_insert  = 2
read_buffer_size  = 2M
read_rnd_buffer_size  = 1M
#
# * Query Cache Configuration
#
# Cache only tiny result sets, so we can fit more in the query cache.
query_cache_limit  = 128K
query_cache_size  = 64M
# for more write intensive setups, set to DEMAND or OFF
#query_cache_type  = DEMAND
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file        = /var/log/mysql/mysql.log
#general_log             = 1
#
# Error logging goes to syslog due to /etc/mysql/conf.d/mysqld_safe_syslog.cnf.
#
# we do want to know about network errors and such
#log_warnings = 2
#
# Enable the slow query log to see queries with especially long duration
#slow_query_log[={0|1}]
slow_query_log_file  = /var/log/mysql/mariadb-slow.log
long_query_time = 10
#log_slow_rate_limit  = 1000
#log_slow_verbosity  = query_plan

#log-queries-not-using-indexes
#log_slow_admin_statements
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
#       other settings you may need to change.
#server-id = 1
#report_host = master1
#auto_increment_increment = 2
#auto_increment_offset  = 1
#log_bin = /var/log/mysql/mariadb-bin
#log_bin_index = /var/log/mysql/mariadb-bin.index
# not fab for performance, but safer
#sync_binlog = 1
expire_logs_days  = 10
max_binlog_size         = 100M
# slaves
#relay_log = /var/log/mysql/relay-bin
#relay_log_index  = /var/log/mysql/relay-bin.index
#relay_log_info_file  = /var/log/mysql/relay-bin.info
#log_slave_updates
#read_only
#
# If applications support it, this stricter sql_mode prevents some
# mistakes like inserting invalid dates etc.
#sql_mode = NO_ENGINE_SUBSTITUTION,TRADITIONAL
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
default_storage_engine  = InnoDB
# you can't just change log file size, requires special procedure
#innodb_log_file_size  = 50M
innodb_buffer_pool_size
= 256M
innodb_log_buffer_size  = 8M
innodb_file_per_table  = 1
innodb_open_files  = 400
innodb_io_capacity  = 400
innodb_flush_method  = O_DIRECT
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem

#
# * Galera-related settings
#
[galera]
# Mandatory settings
#wsrep_on=ON
#wsrep_provider=
#wsrep_cluster_address=
#binlog_format=row
#default_storage_engine=InnoDB
#innodb_autoinc_lock_mode=2
#
# Allow server to accept connections on all interfaces.
#
#bind-address=0.0.0.0
#
# Optional setting
#wsrep_slave_threads=1
#innodb_flush_log_at_trx_commit=0

[mysqldump]
quick
quote-names
max_allowed_packet  = 16M

[mysql]
#no-auto-rehash  # faster start of mysql but no tab completion

[isamchk]
key_buffer = 16M

#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/



On Wed, Jan 4, 2017 at 6:31 PM, Reindl Harald <h.reindl@thelounge.net> wrote:
the stuff below only shows innodb settings which is not all

how large is your *dataset*
how many connections do you have at peak times
how much memory does your system have for the workload
how is query cache configured
why don't you just use MyISAM if you don't have suiteable ressources
what is the content of your "my.cnf"

if your container is oom killed you likely don't have enough physical ressources for your dataset and should fix that properly instead cripple down services - we are at 2017 and not in the 1990's where 64 MB was common


Am 04.01.2017 um 22:21 schrieb l vic:
I didn't suggest it as "solution", just wondering if huge default value
can cause problems.
The real problem is that memory consumption of mysqld is growing in time
until the container oom and is killed;
What would be my "read config": list of system variables?
+---------------------------------------------+------------------------+
| Variable_name                               | Value                  |
+---------------------------------------------+------------------------+
| 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                    | 2                      |
| 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                     | 2147483648             |
| 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                | none                   |
| 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_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              | 1                      |
| 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_wait_timeout                    | 50                     |
| innodb_locking_fake_changes                 | ON                     |
| innodb_locks_unsafe_for_binlog              | ON                     |
| 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                 | OFF                    |
| innodb_log_file_size                        | 50331648               |
| 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_purge_batch_size                     | 300                    |
| innodb_purge_threads                        | 1                      |
| innodb_random_read_ahead                    | OFF                    |
| innodb_read_ahead_threshold                 | 56                     |
| innodb_read_io_threads                      | 4                      |
| 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_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_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                              | 5.6.28-76.1            |
| innodb_write_io_threads                     | 4                      |


On Tue, Jan 3, 2017 at 2:39 PM, Reindl Harald <h.reindl@thelounge.net
<mailto:h.reindl@thelounge.net>> wrote:

    don't come with random solutions instead describe your problem
    properly and show your real config - the subject of this thread is
    nonsense and the options below are *not* your problem in real life

    Am 03.01.2017 um 20:13 schrieb l vic:

        How's about |max_binlog_cache_size or max_binlog_stmt_cache_size ?
        ||
        ||max_binlog_cache_size defaults to 18446744073709547520
        |
        |Can it be more than available RAM ?
        |

        On Fri, Dec 30, 2016 at 9:55 AM, Reindl Harald
        <h.reindl@thelounge.net <mailto:h.reindl@thelounge.net>
        <mailto:h.reindl@thelounge.net <mailto:h.reindl@thelounge.net>>>
        wrote:



            Am 30.12.2016 um 14:20 schrieb l vic:

                and what should happen after reach it?
                a hard stop?
                Should use virt. memory/swap
                why don't you just configure your server to match your
        needs?
                I don't have control over the cluster and MariaDB
        instances share
                hardware with other services


            jesus christ fix your mail-client

            using virtual memory / swap is not the job of the
        application, it's
            the job of the underlying operating system to swap out
        unused pages
            by LRU algorithms - in most cases when your OS starts heavily
            swapping the game is over and so you have to adjust the
        ressource
            consumation of your services or just add physical memory

            "I don't have control over the cluster and MariaDB instances
        share"
            - when you have no control at all you can't change anything,
        as long
            as you have control of your "my.cnf" adjust caches and
        buffers as i
            told you that we have mariadb instances which are consuming
        between
            35 MB and many GB RAM - depending on the size of the dataset,
            buffer-pool settings and so on



                On Wed, Dec 28, 2016 at 6:42 PM, Reindl Harald
                <h.reindl@thelounge.net <mailto:h.reindl@thelounge.net>
        <mailto:h.reindl@thelounge.net <mailto:h.reindl@thelounge.net>>
                <mailto:h.reindl@thelounge.net
        <mailto:h.reindl@thelounge.net> <mailto:h.reindl@thelounge.net
        <mailto:h.reindl@thelounge.net>>>>
                wrote:

                    Am 28.12.2016 um 19:47 schrieb l vic:

                        Is there some way to set hard limit for use of
        RAM by
                mariaDB
                        server?


                    and what should happen after reach it?
                    a hard stop?

                    why don't you just configure your server to match
        your needs?

                    we have MariaDB instances between 35 MB and 10 GB RAM
                depending on
                    the usecase - small instances with a small dataset don't
                need much
                    caches and buffers, machine srunning dbmail need really
                large buffers

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