On Sun, Feb 28, 2010 at 5:24 PM, Alvise Nicoletti <lists@xxxxxxxxxxxxxxxxxxx> wrote: > Hi. > I searched help from several months ago with no success. > So I'll repeat again my problem hoping that this time someone will answer. > > I often (3 times in a month) control of my virtual server, so I have to call > the provider to soft-reset it. > The problem is that apache takes all the memory and the cpu usage of the > server, and sometimes after that I have also kernel panic errors. > > Even with the server working, I have the apache2 daemons big from 30 to 50 > megabytes each one (now I use 9). > > > In the logs I found stuff like this: > Feb 28 12:54:09 utopia kernel: [408986.594006] apache2 invoked oom-killer: > gfp_mask=0x1201d2, order=0, oomkilladj=0 > Feb 28 12:54:09 utopia kernel: [408986.594022] Pid: 6817, comm: apache2 Not > tainted 2.6.28-18-server #59-Ubuntu > Feb 28 12:54:09 utopia kernel: [408986.594026] Call Trace: > Feb 28 12:54:09 utopia kernel: [408986.594080] [<ffffffff802b3825>] > oom_kill_process+0x95/0x240 > Feb 28 12:54:09 utopia kernel: [408986.594087] [<ffffffff802b3fdf>] ? > select_bad_process+0xef/0x130 > Feb 28 12:54:09 utopia kernel: [408986.594091] [<ffffffff802b40d4>] > out_of_memory+0xb4/0x150 > Feb 28 12:54:09 utopia kernel: [408986.594095] [<ffffffff802b6c49>] > __alloc_pages_internal+0x4a9/0x4f0 > Feb 28 12:54:09 utopia kernel: [408986.594101] [<ffffffff802b9a7a>] > __do_page_cache_readahead+0xda/0x210 > Feb 28 12:54:09 utopia kernel: [408986.594105] [<ffffffff802b9c0e>] > do_page_cache_readahead+0x5e/0x90 > Feb 28 12:54:09 utopia kernel: [408986.594108] [<ffffffff802b201a>] > filemap_fault+0x34a/0x430 > Feb 28 12:54:09 utopia kernel: [408986.594113] [<ffffffff802c6010>] > __do_fault+0x50/0x520 > Feb 28 12:54:09 utopia kernel: [408986.594117] [<ffffffff802c7199>] > handle_mm_fault+0x1e9/0x470 > Feb 28 12:54:09 utopia kernel: [408986.594134] [<ffffffff802f3a1f>] ? > path_walk+0xbf/0xd0 > Feb 28 12:54:09 utopia kernel: [408986.594158] [<ffffffff8022f669>] ? > default_spin_lock_flags+0x9/0x10 > Feb 28 12:54:09 utopia kernel: [408986.594177] [<ffffffff8069e0d7>] > do_page_fault+0x307/0x780 > Feb 28 12:54:09 utopia kernel: [408986.594183] [<ffffffff802eb9f3>] ? > cp_new_stat+0xe3/0xf0 > Feb 28 12:54:09 utopia kernel: [408986.594186] [<ffffffff802ebee6>] ? > sys_newstat+0x36/0x50 > Feb 28 12:54:09 utopia kernel: [408986.594198] [<ffffffff8069b6ba>] > error_exit+0x0/0x70 > Feb 28 12:54:09 utopia kernel: [408986.594202] Mem-Info: > Feb 28 12:54:09 utopia kernel: [408986.594205] DMA per-cpu: > Feb 28 12:54:09 utopia kernel: [408986.594207] CPU 0: hi: 0, btch: 1 > usd: 0 > Feb 28 12:54:09 utopia kernel: [408986.594210] CPU 1: hi: 0, btch: 1 > usd: 0 > Feb 28 12:54:09 utopia kernel: [408986.594212] DMA32 per-cpu: > Feb 28 12:54:09 utopia kernel: [408986.594214] CPU 0: hi: 186, btch: 31 > usd: 183 > Feb 28 12:54:09 utopia kernel: [408986.594216] CPU 1: hi: 186, btch: 31 > usd: 172 > Feb 28 12:54:09 utopia kernel: [408986.594226] Active_anon:363780 > active_file:19 inactive_anon:121250 > Feb 28 12:54:09 utopia kernel: [408986.594228] inactive_file:91 > unevictable:0 dirty:0 writeback:0 unstable:0 > Feb 28 12:54:09 utopia kernel: [408986.594229] free:3066 slab:4774 mapped:1 > pagetables:7473 bounce:0 > Feb 28 12:54:09 utopia kernel: [408986.594234] DMA free:6644kB min:12kB > low:12kB high:16kB active_anon:0kB inactive_anon:0kB acti$ > Feb 28 12:54:09 utopia kernel: [408986.594237] lowmem_reserve[]: 0 2004 2004 > 2004 > Feb 28 12:54:09 utopia kernel: [408986.594244] DMA32 free:5620kB min:5720kB > low:7148kB high:8580kB active_anon:1455120kB inactive$ > Feb 28 12:54:09 utopia kernel: [408986.594247] lowmem_reserve[]: 0 0 0 0 > Feb 28 12:54:09 utopia kernel: [408986.594259] DMA: 3*4kB 3*8kB 3*16kB > 3*32kB 3*64kB 1*128kB 2*256kB 1*512kB 1*1024kB 0*2048kB 1*$ > Feb 28 12:54:09 utopia kernel: [408986.594272] DMA32: 155*4kB 1*8kB 0*16kB > 0*32kB 0*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048k$ > Feb 28 12:54:09 utopia kernel: [408986.594284] 828 total pagecache pages > Feb 28 12:54:09 utopia kernel: [408986.594286] 0 pages in swap cache > Feb 28 12:54:09 utopia kernel: [408986.594288] Swap cache stats: add 4551, > delete 4551, find 160864/160937 > Feb 28 12:54:09 utopia kernel: [408986.594297] Free swap = 0kB > Feb 28 12:54:09 utopia kernel: [408986.594299] Total swap = 0kB > Feb 28 12:54:09 utopia kernel: [408986.608274] 524272 pages RAM > Feb 28 12:54:09 utopia kernel: [408986.608283] 15596 pages reserved > Feb 28 12:54:09 utopia kernel: [408986.608284] 63040 pages shared > Feb 28 12:54:09 utopia kernel: [408986.608286] 500299 pages non-shared > Feb 28 12:54:09 utopia kernel: [408986.608292] Out of memory: kill process > 6817 (apache2) score 63892 or a child > Feb 28 12:54:09 utopia kernel: [408986.609426] Killed process 6817 (apache2) > Feb 28 12:54:17 utopia kernel: [409094.110911] pickup invoked oom-killer: > gfp_mask=0x1201d2, order=0, oomkilladj=0 > Feb 28 12:54:17 utopia kernel: [409094.110925] Pid: 5668, comm: pickup Not > tainted 2.6.28-18-server #59-Ubuntu > Feb 28 12:54:17 utopia kernel: [409094.110929] Call Trace: > (and so on) > > This is my configuration: > Linux utopia 2.6.28-18-server #59-Ubuntu SMP Thu Jan 28 02:25:03 UTC 2010 > x86_64 GNU/Linux > Server version: Apache/2.2.11 (Ubuntu) > Server built: Nov 13 2009 22:06:57 > Server's Module Magic Number: 20051115:21 > Server loaded: APR 1.2.12, APR-Util 1.2.12 > Compiled using: APR 1.2.12, APR-Util 1.2.12 > 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 SINGLE_LISTEN_UNSERIALIZED_ACCEPT > -D APR_HAS_OTHER_CHILD > -D AP_HAVE_RELIABLE_PIPED_LOGS > -D DYNAMIC_MODULE_LIMIT=128 > -D HTTPD_ROOT="" > -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="/etc/apache2/mime.types" > -D SERVER_CONFIG_FILE="/etc/apache2/apache2.conf" > > This is the main configuration of apache2: > <IfModule mpm_prefork_module> > StartServers 5 > MinSpareServers 5 > MaxSpareServers 9 > MaxClients 80 > MaxRequestsPerChild 400 > MaxMemFree 200000 > </IfModule> > > KeepAliveTimeout 3 > MaxKeepAliveRequests 50 > KeepAlive On > Timeout 200 > Add more memory/reduce number of clients/disable KeepAlive. 30-50 MB per child sounds large, unless you are using PHP, in which case it sounds about right. You also seem to allow a very large number of children - MaxClients 80. If you are running out of memory, and can't add any more, don't configure apache so that it can use 2.4 GB - 4 GB of RAM. KeepAlive is good for clients, less good for pre-fork webservers consuming lots of resources. Each client you KeepAlive adds one more unusable child, another 30-50MB of memory used. Cheers Tom --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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