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Thread: Apache not using all slots
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03-31-2011, 12:22 PM #1Junior Guru
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Apache not using all slots
I have a strang problem with apache on my server. Basically this:
Code:Current Time: Thursday, 31-Mar-2011 16:16:00 GMT Restart Time: Thursday, 31-Mar-2011 16:08:15 GMT Parent Server Generation: 0 Server uptime: 7 minutes 45 seconds Total accesses: 50819 - Total Traffic: 1.6 GB CPU Usage: u534.53 s396.66 cu0 cs0 - 200% CPU load 109 requests/sec - 3.4 MB/second - 32.2 kB/request 611 requests currently being processed, 54 idle workers WKKWWWKW_CWWWWWWW__WRKWWWKWWWWWWWWWRW_W_WWK_WC.WWKWWWWWWCWWWRWW_ WWWKWKCRW_WRWCWKWKWKW_KCWWWKCK_KWKWKWWWWWK_KWWK_KWWWRRWWKWKCWK__ W_WKWRWWKKWKWWWWKKRCKKWWWWWWWWKWW_WWRKRWKKWWWWWWWWWWWWWKWWWWWKWW RW_WWWRWKCCWWW__C_KWCWKRRW__WRWWWKWWWWWCWWWWWKKWKW_RKRWWRCCWWWCK WCKWWWWWWWRKWRWWWWWW_WWWKWRWKW__WKWWWWWKWWCRW__KCKRRKWWWRRWWR_WW WW_WWWWWWWCWKWWWWKWCWWCWKWWWWWKWWWWWWWWWKWWWC_KRWWWRWWWWRRKWW_WW WWRWRWC_RWCWWCC_WCK_WRKWKWKWWRW_W_WWWRWKKW__W_KWWW_WCWRWKWWCWKWW WWWWCRKKKKWWKWWWWWWWWWKWK_CWWK_CWWWRCWW_WWWKKKWWW_WWKKWWWCKWWWKW WWWWWWWWWW_WWCWKKCKRWKWWCCWWWWWWKWWWWCWWWWWWWWK_WWWWWWKRWWCKWWWC WKKR_W_RWWWWCWWWWWWKC_WKWKWWKWCKK_KWWWWWW_KWWWKCWWWWWRRWWRW_WWRW WWRWWKWWWWCCK_WWWCCWWKWCRC...................................... ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ..................................
Code:Current Time: Thursday, 31-Mar-2011 16:18:11 GMT Restart Time: Thursday, 31-Mar-2011 16:08:15 GMT Parent Server Generation: 0 Server uptime: 9 minutes 56 seconds Total accesses: 65732 - Total Traffic: 2.1 GB CPU Usage: u687.99 s514.22 cu0 cs0 - 202% CPU load 110 requests/sec - 3.6 MB/second - 33.3 kB/request 515 requests currently being processed, 64 idle workers .KCWK..WWWWW.WKK.._W._C.W_KK.WW_WWWC.WW.WW.WW..W.WWWWWK_W_.WW.WW W.W_R_.WW.WC.WC_W.WKW.C.WWKWCWK.KWWRW.R.WKWW_WK.WWWWW.RCWWWWKW.. C.CWWCWW_.WW_K._W._.RKKKWCWCW_.W_KWW.WWKWRWKWKWWW_WRWW.CWWWRWWKR .WWWWWCW.W.KRWWWWWK.W_CWWW.WWWWWCR.W_.WW.WWWR_WW...W.KRWR_KW_WWC W.CWWKWKKRWK_._._W.RCCW.KWWWWCKKWCWK.WW.WW..W.C.CK.CW_KWWWWKWKKR _W.KWWW.WW.WWKWCW_KRCW.WKWWWCWKRKWW.W.WWCWCWWWKWWK_.WK.WWWW.WWWW _WC_C_KW._KWWW_RW._WW_WW.KCWWW_CK.WWWWWWRKW._.K.WKWWWWWKW.CK.KWW W_WWWWWW.RCW_WWC_RRWKRCW.WKWWWWWW_W.WWW.WCWWW.W_WCK_RRWRWKW_CWWK W_WKWW_W_KKWWWW__R.RRCCRCWRKWWKWWKWWCKKWWCCWWCW_RWCWWKW_C_CWRCWW W_WKKC_K_WKWRWWCW_CWRWWWWWW_WWWKRCWWCWWRKRW__WWKWWCCWRWCWRRWWR_W _CWWWKWKWWW_C_WKWRWWKWRWKW...................................... ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ..................................
Code:Current Time: Thursday, 31-Mar-2011 16:18:29 GMT Restart Time: Thursday, 31-Mar-2011 16:08:15 GMT Parent Server Generation: 0 Server uptime: 10 minutes 14 seconds Total accesses: 67824 - Total Traffic: 2.2 GB CPU Usage: u702.31 s527.03 cu0 cs0 - 200% CPU load 110 requests/sec - 3.6 MB/second - 33.7 kB/request 545 requests currently being processed, 19 idle workers WWWWCWW_WRKKKWCWKKWWWRRRKRWKWWW_WWR..C_.WW.KW..W.W_WWKWWWW.W_.WK W.W.WW..W.KW.WK.R.WK..W.WWWRKWR.KRW.W.W.WCWKR...WWRWW.WRCWWCWK.. W.WWWWWKW._W.W..W.W.WRWCWWRKWW.WWWCK._WKKKKCW.WKWWWW_W.CWWKWWWKC .WWCWWKW.W.WWWWWWWR.CC.WWW.KWKWC._.RC.WW.WRWWKWK...K.KWWCWWRWWR. W.CWWWW.C.http://WWW.R.KW.WCCW.WWWKWWWWRKCR.WW....CWWWWKWWKWWKW WK.WWWW.WW.W.CWKWWWCRW.WR.WWRW.WCWW.W.CWWRWRW.WWWWK.WW.WWWW.CKWW KWW_KWKW.__WCWKWW.RWWWWW.WWWWKWWK.WW_CWKWWW.W.W.WWW_WWWW..WK.KWW KWWK_KWW.RWWKCWWKW.WWWCW.WWRRWWWKWW.WWW.WWWWW.WCWWKKWWWRWWKR_WWW WWWWWRWW.KWWWWWKKW.WCCWWCWRWWWWWW_WWWWKWKWWWWWKRWWWWWR.WWWWWWWWW WWWKRWWKWWWKWKWCRKKKRWRWRWWWKWCWKRWWWWWRK_WWWWWWWRCWWWWW_WWWWKKK RWCWRWWWWWWKWWWWWWWWWCCWKW...................................... ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ..................................
I have set my maxclients as follows:
<IfModule mpm_prefork_module>
ServerLimit 1250
MaxClients 1250
StartServers 200
MinSpareServers 40
MaxSpareServers 200
MaxRequestsPerChild 100
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 3
</IfModule>
Apache config is:
My server config is as follows:
Server version: Apache/2.2.15 (Unix)
Server built: Jul 16 2010 14:25:41
Cpanel::Easy::Apache v3.2.0 rev5152
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: 32-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 SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-D APR_HAS_OTHER_CHILD
-D AP_HAVE_RELIABLE_PIPED_LOGS
-D DYNAMIC_MODULE_LIMIT=128
-D HTTPD_ROOT="/usr/local/apache"
-D SUEXEC_BIN="/usr/local/apache/bin/suexec"
-D DEFAULT_PIDLOG="logs/httpd.pid"
-D DEFAULT_SCOREBOARD="logs/apache_runtime_status"
-D DEFAULT_LOCKFILE="logs/accept.lock"
-D DEFAULT_ERRORLOG="logs/error_log"
-D AP_TYPES_CONFIG_FILE="conf/mime.types"
-D SERVER_CONFIG_FILE="conf/httpd.conf"
Does anyone have any idea what could be causing this?
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03-31-2011, 12:32 PM #2Aspiring Evangelist
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Yes, you have MinSpareServers set to 40, as such Apache will always try to keep between 40 and 200 workers free for new requests.
I don't see what you think is bad about this... if you *didn't* have any free workers that would be a cause for concern.
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03-31-2011, 02:26 PM #3Junior Guru
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Thanks for the reply.
Apache is keeping about half my 1250 slots free though, so would the spareservers settings cause over 600 slots to not be used?
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03-31-2011, 03:04 PM #4WHT Addict
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Spareservers is simply a setting that keeps a minimum or maximum amount of slots available, eg if one person connects you have one less slot available for other clients.
If that one less slot means the number of spare servers is then below the minimum then more spare servers are added/started to keep the number of available slots between the min and max.
So at any point in time you may have up to 200 spare slots not used but are available for use. If you are not using your total 1250 slots then you simply do not have that much traffic or resources available to hit your 1250 limit, it could be that apache is efficient enough in processing data fast enough that you are only hitting 50% of your max clients. (you do not want to hit maxclients)
I do not see what is wrong here...
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04-01-2011, 01:57 AM #5Aspiring Evangelist
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Maybe he's ignoring the fact that even Apache is saying he has between 19 and 64 idle workers (which is quite reasonable), I concur with Kevin.
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04-01-2011, 03:58 AM #6Junior Guru
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04-01-2011, 04:16 AM #7Web Hosting Master
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The apache tries to generate the MinSpareServers number of servers when the server starts up and will increase the spare server amount to MaxSpareServers when it reach close to the MaxClients value requests. Why apache is doing this is because, at less number of hits, it anticipates less future requests. In case of large number of requests, it anticipates more number of future requests, so more spare servers are needed. But there is a limit, and that is MaxSpareServers.
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04-01-2011, 01:05 PM #8WHT Addict
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I would not jump the gun and simply blame apache because connections are not showing up as you would expect.
Are you seeing any reached max clients in your error log or similar? If not then tune apache, & sysctl further. Do you have any graphing setup to monitor your Req/Sec vs Current Apache Connections ? I would suggest you do that...
Also make sure their are no kernel logs (dmesg or messages or system pending your flavor of linux) regarding syn flood detected, sending cookies or etc.
Do you actually have monitors setup to test connectivity to port 80? If so then when alerts happen do your number of TCP sessions spike and if so what state are they in? What is your CPU/MEM/IOwait ?
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