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Zdravím, poprosil by som poradiť s následujúcim problémom.

Raz mesačne sťahujem z externého zdroja veľké množstvo dát a ukladám ich do mysql, myisam tabuliek pomocou perl a cli_php scriptov, tieto tabuky sa nepoužívajú na select, aktualizáciu prevádzam až po stiahnutí všetkých dát. Mám tam Linux version 2.6.32-5-amd64 (Debian 2.6.32-48squeeze6), a mysql 5.1.73-1, Apache/2.4.10 (Debian) na stroji beží aj web. Software Raid 1 HDDs. Po spustení scriptov cítiť trocha zaťaženie, ale web beží v norme.

Teraz máme nový stroj Linux version 3.16.0-4-amd64, (gcc version 4.8.4 (Debian 4.8.4-1), #1 SMP Debian 3.16.7-ckt11-1+deb8u3 (2015-08-04), mysql 5.5.44-0+deb8u1 a Apache/2.4.10 (Debian). Software Raid 1 HDDs. Po spustení spomínaných scriptov dôjde k silnému preťaženiu a web je skoro úplne nedostupný. Mám dojem, že sťahovanie je oveľa rýchlejšie, ale na úkor funkčnosti webu. Scripty som púšťal aj pomocou nice 19, ale evidentne to nepomáha.

Neviete mi prosím poradiť, ako vyladiť server, aby počas sťahovania dát fungoval aj web? Toto sú parametre nového servra.

Mám podozrenie, či to nemá spojitosť so SWAPom, ale neviem sa pohnúť ďalej.

Tento dotaz som už zverejnil do databázovej poradni, ale keďže sa pravdepodobne jedná o celkové nastavenie systému, je vhodnejšie, aby bol tento dotaz v linuxovej poradni, za čo sa ospravedlňujem.

Toto sú výpisy z nového servra, kde je problém:

# cat /proc/sys/vm/overcommit_memory
0

# lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 60
Model name:            Intel(R) Xeon(R) CPU E3-1246 v3 @ 3.50GHz
Stepping:              3
CPU MHz:               3791.621
CPU max MHz:           3900.0000
CPU min MHz:           800.0000
BogoMIPS:              7000.23
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7

# apachectl -V
Server version: Apache/2.4.10 (Debian)
Server built:   Aug  1 2015 20:53:57
Server's Module Magic Number: 20120211:37
Server loaded:  APR 1.5.1, APR-UTIL 1.5.4
Compiled using: APR 1.5.1, APR-UTIL 1.5.4
Architecture:   64-bit
Server MPM:     prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=256
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

# cat /etc/mysql/my.cnf   | egrep -v "(^#.*|^$)"
[client]
port		= 3306
socket		= /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket		= /var/run/mysqld/mysqld.sock
nice		= 0
[mysqld]
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
skip-external-locking
bind-address		= 127.0.0.1
key_buffer		= 16M
max_allowed_packet	= 16M
thread_stack		= 192K
thread_cache_size       = 8
myisam-recover         = BACKUP
max_connections        = 250
low_priority_updates	= 1
query_cache_limit	= 1M
query_cache_size        = 16M
log_error = /var/log/mysql/error.log
expire_logs_days	= 10
max_binlog_size         = 100M
[mysqldump]
quick
quote-names
max_allowed_packet	= 16M
[mysql]
[isamchk]
key_buffer		= 16M
!includedir /etc/mysql/conf.d/

# cat /etc/apache2/apache2.conf  | egrep -v "(^#.*|^$)"

Mutex file:${APACHE_LOCK_DIR} default
PidFile ${APACHE_PID_FILE}
Timeout 45
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 5
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
HostnameLookups Off
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
IncludeOptional mods-enabled/*.load
IncludeOptional mods-enabled/*.conf
Include ports.conf
AccessFileName .htaccess
<FilesMatch "^\.ht">
	Require all denied
</FilesMatch>
LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
IncludeOptional conf-enabled/*.conf
IncludeOptional sites-enabled/*.conf

A toto sú výpisy zo starého, kde to funguje relatívne dobre:

# cat /proc/sys/vm/overcommit_memory
0

#lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
CPU(s):                8
Thread(s) per core:    2
Core(s) per socket:    4
CPU socket(s):         1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 58
Stepping:              9
CPU MHz:               3399.943
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K

# apachectl -V
Server version: Apache/2.2.16 (Debian)
Server built:   Feb  1 2014 21:22:42
Server's Module Magic Number: 20051115:24
Server loaded:  APR 1.4.2, APR-Util 1.3.9
Compiled using: APR 1.4.2, APR-Util 1.3.9
Architecture:   64-bit
Server MPM:     Prefork
  threaded:     no
    forked:     yes (variable process count)
Server compiled with....
 -D APACHE_MPM_DIR="server/mpm/prefork"
 -D APR_HAS_SENDFILE
 -D APR_HAS_MMAP
 -D APR_HAVE_IPV6 (IPv4-mapped addresses enabled)
 -D APR_USE_SYSVSEM_SERIALIZE
 -D APR_USE_PTHREAD_SERIALIZE
 -D APR_HAS_OTHER_CHILD
 -D AP_HAVE_RELIABLE_PIPED_LOGS
 -D DYNAMIC_MODULE_LIMIT=128
 -D HTTPD_ROOT="/etc/apache2"
 -D SUEXEC_BIN="/usr/lib/apache2/suexec"
 -D DEFAULT_PIDLOG="/var/run/apache2.pid"
 -D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
 -D DEFAULT_LOCKFILE="/var/run/apache2/accept.lock"
 -D DEFAULT_ERRORLOG="logs/error_log"
 -D AP_TYPES_CONFIG_FILE="mime.types"
 -D SERVER_CONFIG_FILE="apache2.conf"

# cat /etc/mysql/my.cnf   | egrep -v "(^#.*|^$)"
[client]
port		= 3306
socket		= /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket		= /var/run/mysqld/mysqld.sock
nice		= 0
[mysqld]
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
language	= /usr/share/mysql/english
skip-external-locking
bind-address		= 127.0.0.1
key_buffer		= 16M
max_allowed_packet	= 16M
thread_stack		= 192K
thread_cache_size       = 8
myisam-recover         = BACKUP
low_priority_updates	= 1
query_cache_limit	= 1M
query_cache_size        = 16M
expire_logs_days	= 10
max_binlog_size         = 100M
[mysqldump]
quick
quote-names
max_allowed_packet	= 16M
[mysql]
[isamchk]
key_buffer		= 16M
!includedir /etc/mysql/conf.d/

# cat /etc/apache2/apache2.conf  | egrep -v "(^#.*|^$)"

LockFile ${APACHE_LOCK_DIR}/accept.lock
PidFile ${APACHE_PID_FILE}
Timeout 45
KeepAlive Off
MaxKeepAliveRequests 100
KeepAliveTimeout 15
<IfModule mpm_prefork_module>
    StartServers            2
    MinSpareServers         5
    MaxSpareServers        10
    MaxClients             30
    MaxRequestsPerChild  2000
</IfModule>
<IfModule mpm_worker_module>
    StartServers          2
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadLimit          64
    ThreadsPerChild      25
    MaxClients          150
    MaxRequestsPerChild   2000
</IfModule>
<IfModule mpm_event_module>
    StartServers          2
    MaxClients          150
    MinSpareThreads      25
    MaxSpareThreads      75 
    ThreadLimit          64
    ThreadsPerChild      25
    MaxRequestsPerChild   0
</IfModule>
User ${APACHE_RUN_USER}
Group ${APACHE_RUN_GROUP}
AccessFileName .htaccess
<Files ~ "^\.ht">
    Order allow,deny
    Deny from all
    Satisfy all
</Files>
DefaultType text/plain
HostnameLookups Off
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
Include mods-enabled/*.load
Include mods-enabled/*.conf
Include httpd.conf
Include ports.conf
LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined
LogFormat "%h %l %u %t \"%r\" %>s %O" common
LogFormat "%{Referer}i -> %U" referer
LogFormat "%{User-agent}i" agent
Include conf.d/
Include sites-enabled/