MySQL is running VERY slow on CentOS 6x (not 5x)
I have two servers: a VPS and a laptop. I recently re-built both of them, and MySQL is running about 20 times slower on the laptop.
Both servers used to run CentOS 5.8 and I think MySQL 5.1, and the laptop used to do great so I do not think it is the hardware.
For the VPS, my provider installed CentOS 6.4, and then I installed MySQL 5.1.69 using yum with the CentOS repo.
For the laptop, I installed CentOS 6.4 basic server and then installed MySQL 5.1.69 using yum with the CentOS repo.
my.cnf for both servers are identical, and I have shown below. For both servers, I've also included below the output from SHOW VARIABLES; as well as output from sysbench, file system information, and cpu information. I have tried adding skip-name-resolve, but it didn't help.
The matrix below shows the SHOW VARIABLES output from both servers which is different. Again, MySQL was installed the same way, so I do not know why it is different, but it is and I think this might be why the laptop is executing MySQL so slowly.
Why is the laptop running MySQL slowly, and how do I fix it?
Differences between SHOW VARIABLES on both servers
+---------------------------+-----------------------+-------------------------+
| Variable | Value-VPS | Value-Laptop |
+---------------------------+-----------------------+-------------------------+
| hostname | vps.site1.com | laptop.site2.com |
| max_binlog_cache_size | 4294963200 | 18446744073709500000 |
| max_seeks_for_key | 4294967295 | 18446744073709500000 |
| max_write_lock_count | 4294967295 | 18446744073709500000 |
| myisam_max_sort_file_size | 2146435072 | 9223372036853720000 |
| myisam_mmap_size | 4294967295 | 18446744073709500000 |
| plugin_dir | /usr/lib/mysql/plugin | /usr/lib64/mysql/plugin |
| pseudo_thread_id | 7568 | 2 |
| system_time_zone | EST | PDT |
| thread_stack | 196608 | 262144 |
| timestamp | 1372252112 | 1372252046 |
| version_compile_machine | i386 | x86_64 |
+---------------------------+-----------------------+-------------------------+
my.cnf for both servers
[root@server1 ~]# cat /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
innodb_strict_mode=on
sql_mode=TRADITIONAL
# sql_mode=STRICT_TRANS_TABLES,NO_ZERO_DATE,NO_ZERO_IN_DATE
character-set-server=utf8
collation-server=utf8_general_ci
log=/var/log/mysqld_all.log
[root@server1 ~]#
VPS SHOW VARIABLES Info
Same as Laptop shown below but changes per above matrix (removed to allow me to be under the 30000 characters as required by ServerFault)
Laptop SHOW VARIABLES Info
auto_increment_increment 1
auto_increment_offset 1
autocommit ON
automatic_sp_privileges ON
back_log 50
basedir /usr/
big_tables OFF
binlog_cache_size 32768
binlog_direct_non_transactional_updates OFF
binlog_format STATEMENT
bulk_insert_buffer_size 8388608
character_set_client utf8
character_set_connection utf8
character_set_database latin1
character_set_filesystem binary
character_set_results utf8
character_set_server latin1
character_set_system utf8
character_sets_dir /usr/share/mysql/charsets/
collation_connection utf8_general_ci
collation_database latin1_swedish_ci
collation_server latin1_swedish_ci
completion_type 0
concurrent_insert 1
connect_timeout 10
datadir /var/lib/mysql/
date_format %Y-%m-%d
datetime_format %Y-%m-%d %H:%i:%s
default_week_format 0
delay_key_write ON
delayed_insert_limit 100
delayed_insert_timeout 300
delayed_queue_size 1000
div_precision_increment 4
engine_condition_pushdown ON
error_count 0
event_scheduler OFF
expire_logs_days 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 /var/run/mysqld/mysqld.log
group_concat_max_len 1024
have_community_features YES
have_compress YES
have_crypt YES
have_csv YES
have_dynamic_loading YES
have_geometry YES
have_innodb YES
have_ndbcluster NO
have_openssl DISABLED
have_partitioning YES
have_query_cache YES
have_rtree_keys YES
have_ssl DISABLED
have_symlink DISABLED
hostname server1.site2.com
identity 0
ignore_builtin_innodb OFF
init_connect
init_file
init_slave
innodb_adaptive_hash_index ON
innodb_additional_mem_pool_size 1048576
innodb_autoextend_increment 8
innodb_autoinc_lock_mode 1
innodb_buffer_pool_size 8388608
innodb_checksums ON
innodb_commit_concurrency 0
innodb_concurrency_tickets 500
innodb_data_file_path ibdata1:10M:autoextend
innodb_data_home_dir
innodb_doublewrite ON
innodb_fast_shutdown 1
innodb_file_io_threads 4
innodb_file_per_table OFF
innodb_flush_log_at_trx_commit 1
innodb_flush_method
innodb_force_recovery 0
innodb_lock_wait_timeout 50
innodb_locks_unsafe_for_binlog OFF
innodb_log_buffer_size 1048576
innodb_log_file_size 5242880
innodb_log_files_in_group 2
innodb_log_group_home_dir ./
innodb_max_dirty_pages_pct 90
innodb_max_purge_lag 0
innodb_mirrored_log_groups 1
innodb_open_files 300
innodb_rollback_on_timeout OFF
innodb_stats_method nulls_equal
innodb_stats_on_metadata ON
innodb_support_xa ON
innodb_sync_spin_loops 20
innodb_table_locks ON
innodb_thread_concurrency 8
innodb_thread_sleep_delay 10000
innodb_use_legacy_cardinality_algorithm ON
insert_id 0
interactive_timeout 28800
join_buffer_size 131072
keep_files_on_create OFF
key_buffer_size 8384512
key_cache_age_threshold 300
key_cache_block_size 1024
key_cache_division_limit 100
language /usr/share/mysql/english/
large_files_support ON
large_page_size 0
large_pages OFF
last_insert_id 0
lc_time_names en_US
license GPL
local_infile ON
locked_in_memory OFF
log OFF
log_bin OFF
log_bin_trust_function_creators OFF
log_bin_trust_routine_creators OFF
log_error /var/log/mysqld.log
log_output FILE
log_queries_not_using_indexes OFF
log_slave_updates OFF
log_slow_queries OFF
log_warnings 1
long_query_time 10.000000
low_priority_updates OFF
lower_case_file_system OFF
lower_case_table_names 0
max_allowed_packet 1048576
max_binlog_cache_size 18446744073709547520
max_binlog_size 1073741824
max_connect_errors 10
max_connections 151
max_delayed_threads 20
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 1048576
max_prepared_stmt_count 16382
max_relay_log_size 0
max_seeks_for_key 18446744073709551615
max_sort_length 1024
max_sp_recursion_depth 0
max_tmp_tables 32
max_user_connections 0
max_write_lock_count 18446744073709551615
min_examined_row_limit 0
multi_range_count 256
myisam_data_pointer_size 6
myisam_max_sort_file_size 9223372036853727232
myisam_mmap_size 18446744073709551615
myisam_recover_options OFF
myisam_repair_threads 1
myisam_sort_buffer_size 8388608
myisam_stats_method nulls_unequal
myisam_use_mmap OFF
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
new OFF
old OFF
old_alter_table OFF
old_passwords OFF
open_files_limit 1024
optimizer_prune_level 1
optimizer_search_depth 62
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on
pid_file /var/run/mysqld/mysqld.pid
plugin_dir /usr/lib64/mysql/plugin
port 3306
preload_buffer_size 32768
profiling OFF
profiling_history_size 15
protocol_version 10
pseudo_thread_id 3
query_alloc_block_size 8192
query_cache_limit 1048576
query_cache_min_res_unit 4096
query_cache_size 0
query_cache_type ON
query_cache_wlock_invalidate OFF
query_prealloc_size 8192
rand_seed1
rand_seed2
range_alloc_block_size 4096
read_buffer_size 131072
read_only OFF
read_rnd_buffer_size 262144
relay_log
relay_log_index
relay_log_info_file relay-log.info
relay_log_purge ON
relay_log_space_limit 0
report_host
report_password
report_port 3306
report_user
rpl_recovery_rank 0
secure_auth OFF
secure_file_priv
server_id 0
skip_external_locking ON
skip_name_resolve OFF
skip_networking OFF
skip_show_database OFF
slave_compressed_protocol OFF
slave_exec_mode STRICT
slave_load_tmpdir /tmp
slave_max_allowed_packet 1073741824
slave_net_timeout 3600
slave_skip_errors OFF
slave_transaction_retries 10
slow_launch_time 2
slow_query_log OFF
slow_query_log_file /var/run/mysqld/mysqld-slow.log
socket /var/lib/mysql/mysql.sock
sort_buffer_size 2097144
sql_auto_is_null ON
sql_big_selects ON
sql_big_tables OFF
sql_buffer_result OFF
sql_log_bin ON
sql_log_off OFF
sql_log_update ON
sql_low_priority_updates OFF
sql_max_join_size 18446744073709551615
sql_mode
sql_notes ON
sql_quote_show_create ON
sql_safe_updates OFF
sql_select_limit 18446744073709551615
sql_slave_skip_counter
sql_warnings OFF
ssl_ca
ssl_capath
ssl_cert
ssl_cipher
ssl_key
storage_engine MyISAM
sync_binlog 0
sync_frm ON
system_time_zone PDT
table_definition_cache 256
table_lock_wait_timeout 50
table_open_cache 64
table_type MyISAM
thread_cache_size 0
thread_handling one-thread-per-connection
thread_stack 262144
time_format %H:%i:%s
time_zone SYSTEM
timed_mutexes OFF
timestamp 1372254399
tmp_table_size 16777216
tmpdir /tmp
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
tx_isolation REPEATABLE-READ
unique_checks ON
updatable_views_with_limit YES
version 5.1.69
version_comment Source distribution
version_compile_machine x86_64
version_compile_os redhat-linux-gnu
wait_timeout 28800
warning_count 0
VPS Sysbench Info
Deleted to stay under 30000 characters.
Laptop Sysbench Info
[root@server1 ~]# cat sysbench.txt
sysbench 0.4.12: multi-threaded system evaluation benchmark
Running the test with following options:
Number of threads: 8
Doing OLTP test.
Running mixed OLTP test
Doing read-only test
Using Special distribution (12 iterations, 1 pct of values are returned in 75 pct cases)
Using "BEGIN" for starting transactions
Using auto_inc on the id column
Threads started!
Time limit exceeded, exiting...
(last message repeated 7 times)
Done.
OLTP test statistics:
queries performed:
read: 634718
write: 0
other: 90674
total: 725392
transactions: 45337 (755.56 per sec.)
deadlocks: 0 (0.00 per sec.)
read/write requests: 634718 (10577.78 per sec.)
other operations: 90674 (1511.11 per sec.)
Test execution summary:
total time: 60.0048s
total number of events: 45337
total time taken by event execution: 479.4912
per-request statistics:
min: 2.04ms
avg: 10.58ms
max: 85.56ms
approx. 95 percentile: 19.70ms
Threads fairness:
events (avg/stddev): 5667.1250/42.18
execution time (avg/stddev): 59.9364/0.00
[root@server1 ~]#
VPS File Info
[root@vps ~]# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/simfs simfs 20971520 16187440 4784080 78% /
none tmpfs 6224432 4 6224428 1% /dev
none tmpfs 6224432 0 6224432 0% /dev/shm
[root@vps ~]#
Laptop File Info
[root@server1 ~]# df -T
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg_server1-lv_root
ext4 72383800 4243964 64462860 7% /
tmpfs tmpfs 956352 0 956352 0% /dev/shm
/dev/sdb1 ext4 495844 60948 409296 13% /boot
[root@server1 ~]#
VPS CPU Info
Removed to stay under the 30000 character limit required by ServerFault
Laptop CPU Info
[root@server1 ~]# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz
stepping : 13
cpu MHz : 800.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida dts tpr_shadow vnmi flexpriority
bogomips : 3591.39
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7100 @ 1.80GHz
stepping : 13
cpu MHz : 800.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida dts tpr_shadow vnmi flexpriority
bogomips : 3591.39
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
[root@server1 ~]#
EDIT New Info requested by shakalandy
[root@localhost ~]# cat /proc/meminfo
MemTotal: 2044804 kB
MemFree: 761464 kB
Buffers: 68868 kB
Cached: 369708 kB
SwapCached: 0 kB
Active: 881080 kB
Inactive: 246016 kB
Active(anon): 688312 kB
Inactive(anon): 4416 kB
Active(file): 192768 kB
Inactive(file): 241600 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 4095992 kB
SwapFree: 4095992 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 688428 kB
Mapped: 65156 kB
Shmem: 4216 kB
Slab: 92428 kB
SReclaimable: 31260 kB
SUnreclaim: 61168 kB
KernelStack: 2392 kB
PageTables: 28356 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 5118392 kB
Committed_AS: 1530212 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 343604 kB
VmallocChunk: 34359372920 kB
HardwareCorrupted: 0 kB
AnonHugePages: 520192 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 8556 kB
DirectMap2M: 2078720 kB
[root@localhost ~]# ps aux | grep mysql
root 2227 0.0 0.0 108332 1504 ? S 07:36 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/localhost.badobe.com.pid
mysql 2319 0.1 24.5 1470068 501360 ? Sl 07:36 0:57 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/localhost.badobe.com.err --pid-file=/var/lib/mysql/localhost.badobe.com.pid
root 3579 0.0 0.1 201840 3028 pts/0 S+ 07:40 0:00 mysql -u root -p
root 13887 0.0 0.1 201840 3036 pts/3 S+ 18:08 0:00 mysql -uroot -px xxxxxxxxxx
root 14449 0.0 0.0 103248 840 pts/2 S+ 18:16 0:00 grep mysql
[root@localhost ~]# ps aux | grep mysql
root 2227 0.0 0.0 108332 1504 ? S 07:36 0:00 /bin/sh /usr/bin/mysqld_safe --datadir=/var/lib/mysql --pid-file=/var/lib/mysql/localhost.badobe.com.pid
mysql 2319 0.1 24.5 1470068 501356 ? Sl 07:36 0:57 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib64/mysql/plugin --user=mysql --log-error=/var/lib/mysql/localhost.badobe.com.err --pid-file=/var/lib/mysql/localhost.badobe.com.pid
root 3579 0.0 0.1 201840 3028 pts/0 S+ 07:40 0:00 mysql -u root -p
root 13887 0.0 0.1 201840 3048 pts/3 S+ 18:08 0:00 mysql -uroot -px xxxxxxxxxx
root 14470 0.0 0.0 103248 840 pts/2 S+ 18:16 0:00 grep mysql
[root@localhost ~]# vmstat 1
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 0 0 742172 76376 371064 0 0 6 6 78 202 2 1 97 1 0
0 0 0 742164 76380 371060 0 0 0 16 191 467 2 1 93 5 0
0 0 0 742164 76380 371064 0 0 0 0 148 388 2 1 98 0 0
0 0 0 742164 76380 371064 0 0 0 0 159 418 2 1 98 0 0
0 0 0 742164 76380 371064 0 0 0 0 145 380 2 1 98 0 0
0 0 0 742164 76380 371064 0 0 0 0 166 429 2 1 97 0 0
1 0 0 742164 76380 371064 0 0 0 0 148 373 2 1 98 0 0
0 0 0 742164 76380 371064 0 0 0 0 149 382 2 1 98 0 0
0 0 0 742164 76380 371064 0 0 0 0 168 408 2 0 97 0 0
0 0 0 742164 76380 371064 0 0 0 0 165 394 2 1 98 0 0
0 0 0 742164 76380 371064 0 0 0 0 159 354 2 1 98 0 0
0 0 0 742164 76388 371060 0 0 0 16 180 447 2 0 91 6 0
0 0 0 742164 76388 371064 0 0 0 0 143 344 2 1 98 0 0
0 1 0 742784 76416 370044 0 0 28 580 360 678 3 1 74 23 0
1 0 0 744768 76496 367772 0 0 40 1036 437 865 3 1 53 43 0
0 1 0 747248 76596 365412 0 0 48 1224 561 923 3 2 53 43 0
0 1 0 749232 76696 363092 0 0 32 1132 512 883 3 2 52 44 0
0 1 0 751340 76772 361020 0 0 32 1008 472 872 2 1 52 45 0
0 1 0 753448 76840 358540 0 0 36 1088 512 860 2 1 51 46 0
0 1 0 755060 76936 357636 0 0 28 1012 481 922 2 2 52 45 0
0 1 0 755060 77064 357988 0 0 12 896 444 902 2 1 53 45 0
0 1 0 754688 77148 358448 0 0 16 1096 506 1007 1 1 56 42 0
0 2 0 754192 77268 358932 0 0 12 1060 481 957 1 2 53 44 0
0 1 0 753696 77380 359392 0 0 12 1052 512 1025 2 1 55 42 0
0 1 0 751028 77480 359828 0 0 8 984 423 909 2 2 52 45 0
0 1 0 750524 77620 360200 0 0 8 788 367 869 1 2 54 44 0
0 1 0 749904 77700 360664 0 0 8 928 439 924 2 2 55 43 0
0 1 0 749408 77796 361084 0 0 12 976 468 967 1 1 56 43 0
0 1 0 748788 77896 361464 0 0 12 992 453 944 1 2 54 43 0
1 1 0 748416 77992 361996 0 0 12 784 392 868 2 1 52 46 0
0 1 0 747920 78092 362336 0 0 4 896 382 874 1 1 52 46 0
0 1 0 745252 78172 362780 0 0 12 1040 444 923 1 1 56 42 0
0 1 0 744764 78288 363220 0 0 8 1024 448 934 2 1 55 43 0
0 1 0 744144 78408 363668 0 0 8 1000 461 982 2 1 53 44 0
0 1 0 743648 78488 364148 0 0 8 872 443 888 2 1 54 43 0
0 1 0 743152 78548 364468 0 0 16 1020 511 995 2 1 55 43 0
0 1 0 742656 78632 365024 0 0 12 928 431 913 1 2 53 44 0
0 1 0 742160 78728 365468 0 0 12 996 470 955 2 2 54 44 0
1 1 0 739492 78840 365896 0 0 8 988 447 939 1 2 52 46 0
0 1 0 738872 78996 366352 0 0 12 972 442 928 1 1 55 44 0
1 1 0 738244 79148 366812 0 0 8 948 549 1126 2 2 54 43 0
0 1 0 737624 79312 367188 0 0 12 996 456 953 2 2 54 43 0
0 1 0 736880 79456 367660 0 0 12 960 444 918 1 1 53 46 0
0 1 0 736260 79584 368124 0 0 8 884 414 921 1 1 54 44 0
0 1 0 735648 79716 368488 0 0 12 976 450 955 2 1 56 41 0
0 1 0 733104 79840 368988 0 0 12 932 453 918 1 2 55 43 0
0 1 0 732608 79996 369356 0 0 16 916 444 889 1 2 54 43 0
1 1 0 731476 80128 369800 0 0 16 852 514 978 2 2 54 43 0
0 1 0 731244 80252 370200 0 0 8 904 398 870 2 1 55 43 0
1 1 0 730624 80384 370612 0 0 12 1032 447 977 1 2 57 41 0
0 1 0 730004 80524 371096 0 0 12 984 469 941 2 2 52 45 0
0 1 0 729508 80636 371544 0 0 12 928 438 922 2 1 52 46 0
0 1 0 728888 80756 371948 0 0 16 972 439 943 2 1 55 43 0
0 1 0 726468 80900 372272 0 0 8 960 545 1024 2 1 54 43 0
1 1 0 726344 81024 372272 0 0 8 464 490 1057 1 2 53 44 0
0 1 0 726096 81148 372276 0 0 4 328 441 1063 2 1 53 45 0
1 1 0 726096 81256 372292 0 0 0 296 387 975 1 1 53 45 0
0 1 0 725848 81380 372284 0 0 4 332 425 1034 2 1 54 44 0
1 1 0 725848 81496 372300 0 0 4 308 386 992 2 1 54 43 0
0 1 0 725600 81616 372296 0 0 4 328 404 1060 1 1 54 44 0
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
0 1 0 725600 81732 372296 0 0 4 328 439 1011 1 1 53 44 0
0 1 0 725476 81848 372308 0 0 0 316 441 1023 2 2 52 46 0
1 1 0 725352 81972 372300 0 0 4 344 451 1021 1 1 55 43 0
2 1 0 725228 82088 372320 0 0 0 328 427 1058 1 1 54 44 0
1 1 0 724980 82220 372300 0 0 4 336 419 999 2 1 54 44 0
1 1 0 724980 82328 372320 0 0 4 320 430 1019 1 1 54 44 0
1 1 0 724732 82436 372328 0 0 0 388 363 942 2 1 54 44 0
1 1 0 724608 82560 372312 0 0 4 308 419 993 1 2 54 44 0
1 0 0 724360 82684 372320 0 0 0 304 421 1028 2 1 55 42 0
1 0 0 724360 82684 372388 0 0 0 0 158 416 2 1 98 0 0
1 1 0 724236 82720 372360 0 0 0 6464 243 855 3 2 84 12 0
1 0 0 724112 82748 372360 0 0 0 5356 266 895 3 1 84 12 0
2 1 0 724112 82764 372380 0 0 0 3052 221 511 2 2 93 4 0
1 0 0 724112 82796 372372 0 0 0 4548 325 1067 2 2 81 16 0
1 0 0 724112 82816 372368 0 0 0 3240 259 829 3 1 90 6 0
1 0 0 724112 82836 372380 0 0 0 3260 309 822 3 2 88 8 0
1 1 0 724112 82876 372364 0 0 0 4680 326 978 3 1 77 19 0
1 0 0 724112 82884 372380 0 0 0 512 207 508 2 1 95 2 0
1 0 0 724112 82884 372388 0 0 0 0 138 361 2 1 98 0 0
1 0 0 724112 82884 372388 0 0 0 0 158 397 2 1 98 0 0
1 0 0 724112 82884 372388 0 0 0 0 146 395 2 1 98 0 0
2 0 0 724112 82884 372388 0 0 0 0 160 395 2 1 98 0 0
1 0 0 724112 82884 372388 0 0 0 0 163 382 1 1 98 0 0
1 0 0 724112 82884 372388 0 0 0 0 176 422 2 1 98 0 0
1 0 0 724112 82884 372388 0 0 0 0 134 351 2 1 98 0 0
0 0 0 724112 82884 372388 0 0 0 0 190 429 2 1 97 0 0
0 0 0 724104 82884 372392 0 0 0 0 139 358 2 1 98 0 0
0 0 0 724848 82884 372392 0 0 0 4 211 432 2 1 97 0 0
1 0 0 724980 82884 372392 0 0 0 0 166 370 2 1 98 0 0
0 0 0 724980 82884 372392 0 0 0 0 164 397 2 1 98 0 0
^C
[root@localhost ~]#
Database size
mysql> SELECT table_schema "Data Base Name", sum( data_length + index_length ) / 1024 / 1024 "Data Base Size in MB", sum( data_free )/ 1024 / 1024 "Free Space in MB" FROM information_schema.TABLES GROUP BY table_schema;
+--------------------+----------------------+------------------+
| Data Base Name | Data Base Size in MB | Free Space in MB |
+--------------------+----------------------+------------------+
| bidjunction | 4.68750000 | 0.00000000 |
| information_schema | 0.00976563 | 0.00000000 |
| mysql | 0.63899899 | 0.00105286 |
+--------------------+----------------------+------------------+
3 rows in set (0.01 sec)
mysql>
Before Query
mysql> SHOW SESSION STATUS like '%Tmp%';
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 6 |
| Created_tmp_tables | 0 |
+-------------------------+-------+
3 rows in set (0.00 sec)
mysql>
After Query
mysql> SHOW SESSION STATUS like '%Tmp%';
+-------------------------+-------+
| Variable_name | Value |
+-------------------------+-------+
| Created_tmp_disk_tables | 0 |
| Created_tmp_files | 6 |
| Created_tmp_tables | 2 |
+-------------------------+-------+
3 rows in set (0.00 sec)
mysql>
Solution 1:
CentOS 6.x uses ext4. If your datadir is on ext4 set the barrier=0 option.
See here.
Cheers
Solution 2:
You "fix" it by getting a newer laptop.
First, your laptop is using a six year old CPU (and is in power saving!) which isn't even really designed for server workloads.
Second... no, that really is the root of the "problem."
Solution 3:
although you posted your configuration, a lot other information is missing.
- How much memory do you have?
- How much memory is MySQL consuming on your laptop? (ps aux)
- How big is the database your testing with?
- Is your database using MyIsam or InnoDB table engine?
- Can you put some workload on it and log the output of vmstat 1 for some minutes?