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Dobrica Pavlinušić's random unstructured stuff
titan performance: Revision 4
Before performance tuningMemory
titan:~# free
total used free shared buffers cached
Mem: 903920 884360 19560 0 6728 167636
-/+ buffers/cache: 709996 193924
Swap: 995988 367732 628256
Koristi relativno mnogo swap-a, dmesg ima poruke o OOM-u, dakle treba mu više swap-a (ideja: smanjiti broj apache childova, jer je apache-ssl zapravo jako velik). Mašina zapravo brutalno swap-a, pa nije ni čudo da se vuče kao crknuta krava: titan:~# vmstat 3 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 6 37 430500 7692 3728 105088 8 2 14 3 2 11 18 12 69 0 3 45 432800 6512 3632 103128 2524 1596 4019 1931 1370 1613 11 28 61 0 2 47 442860 7460 3608 102216 649 2553 857 2664 489 381 3 32 65 0 5 56 444028 4760 3620 102328 497 1840 556 1869 464 282 3 37 60 0 16 44 472132 6788 3684 102392 4467 10889 5239 11409 3297 2770 5 34 61 0 11 36 474232 5868 3784 103212 1589 1212 2047 1435 681 812 13 28 59 0 3 38 488996 5232 3708 102672 1952 5435 2985 5885 1704 1675 7 30 63 0 1 18 493556 6976 3808 104396 491 855 1291 1105 866 643 8 31 61 0 0 24 497508 6024 3736 104160 203 1576 1008 1768 551 592 6 36 59 0 2 20 499324 5900 3800 105964 509 375 1549 533 517 727 8 30 62 0 6 23 501608 5928 3844 106700 300 1528 804 1647 505 466 5 35 60 0 2 26 500752 7804 3872 106388 629 583 1281 795 508 588 6 29 64 0 4 26 500240 8068 3872 107264 533 300 1311 439 465 580 9 28 63 0 Disk nema uključen dma: titan:~# hdparm /dev/hda /dev/hda: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 0 (off) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 9729/255/63, sectors = 156299375, start = 0 titan:~# hdparm -d 1 -c 3 -a 16 -m 16 /dev/hda Instalirao sam: atop, hdparm, vim, sysstat Vratio sam direktive za broj apache child-ova: titan:~# diff -urw /etc/apache-ssl/httpd.conf.before_dpavlin /etc/apache-ssl/httpd.conf *** /etc/apache-ssl/httpd.conf.before_dpavlin 2007-02-07 19:29:54.000000000 +0100 *** /etc/apache-ssl/httpd.conf 2007-02-07 19:34:07.000000000 +0100 @@ -139,10 +139,15 @@ # a new spare. If there are more than MaxSpareServers, some of the # spares die off. The default values are probably OK for most sites. # +MinSpareServers 10 +MaxSpareServers 20 + # # Number of servers to start initially --- should be a reasonable ballpark # figure. # +StartServers 50 + # # Limit on total number of servers running, i.e., limit on the number # of clients who can simultaneously connect --- if this limit is ever @@ -150,6 +155,8 @@ # It is intended mainly as a brake to keep a runaway server from taking # the system with it as it spirals down... # +MaxClients 512 +#MaxClients 2048 # # MaxRequestsPerChild: the number of requests each child process is Brojevi su namjerno konzervativno mali, cilj je prestati koristiti swap. Pokušao sam smanjiti broj konekacija iz php-a na mysql: titan:~# diff -urw /etc/php4/apache/php.ini.before_dpavlin /etc/php4/apache/php.ini *** /etc/php4/apache/php.ini.before_dpavlin 2007-01-31 22:19:05.000000000 +0100 *** /etc/php4/apache/php.ini 2007-02-07 19:45:40.000000000 +0100 @@ -530,7 +530,7 @@ mysql.max_persistent = 16 ; Maximum number of links (persistent + non-persistent). -1 means no limit. -mysql.max_links = 256 +mysql.max_links = 32 mysql.connect_timeout = 30 ; Default port number for mysql_connect(). If unset, mysql_connect() will use sve u svemu, ne naročito uspješno:
titan:~# ps ax | egrep '(apache-ssl|mysqld)' | awk '{ print $5 }' | sort | uniq -c
98 /usr/sbin/apache-ssl
57 /usr/sbin/mysqld
titan:~# free
total used free shared buffers cached
Mem: 903920 855524 48396 0 8560 177080
-/+ buffers/cache: 669884 234036
Swap: 995988 236548 759440
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