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I'm running a 512MB and i have lot of ram issues. I think is due to my configuration.

root@s1:~# free -m total used free shared buffers cached Mem: 1024 1022 1 0 0 0 -/+ buffers/cache: 1022 1 Swap: 0 0 0 root@s1:~# ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.0 0.1 23760 1756 ? Ss 15:33 0:00 init root 1086 0.0 0.0 21304 1016 ? Ss 15:33 0:00 /sbin/udevd --daemon root 1153 0.0 0.2 49988 2908 ? Ss 15:33 0:00 /usr/sbin/sshd -D root 1199 0.0 0.1 14924 1104 ? Ss 15:33 0:00 /usr/sbin/xinetd -dontfork -pidfile /var/run/xinetd.pid -stayalive -inetd_com root 1201 0.0 0.0 19068 1020 ? Ss 15:33 0:00 cron syslog 1235 0.0 0.0 12704 816 ? Ss 15:33 0:00 /sbin/syslogd -u syslog root 1276 0.0 0.0 4352 748 ? S 15:33 0:00 /bin/sh /usr/bin/mysqld_safe mysql 1345 0.0 4.0 512600 42444 ? Sl 15:33 0:00 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/li root 1435 0.0 0.1 76844 1404 ? Ss 15:33 0:00 nginx: master process /usr/sbin/nginx www-data 1436 0.0 0.1 77164 1928 ? S 15:33 0:00 nginx: worker process www-data 1437 0.0 0.1 77164 1960 ? S 15:33 0:00 nginx: worker process www-data 1440 0.0 0.1 77164 1960 ? S 15:33 0:00 nginx: worker process www-data 1443 0.0 0.1 77164 1940 ? S 15:33 0:00 nginx: worker process root 1466 0.0 0.5 337844 6232 ? Ss 15:33 0:00 php-fpm: master process (/etc/php5/fpm/php-fpm.conf) www-data 1468 0.0 0.5 337844 5316 ? S 15:33 0:00 php-fpm: pool www www-data 1471 0.0 0.5 337844 5316 ? S 15:33 0:00 php-fpm: pool www www-data 1472 0.0 0.5 337844 5316 ? S 15:33 0:00 php-fpm: pool www www-data 1473 0.0 0.5 337844 5316 ? S 15:33 0:00 php-fpm: pool www www-data 1474 0.0 0.5 337844 5316 ? S 15:33 0:00 php-fpm: pool www www-data 1475 0.0 0.5 337844 5316 ? S 15:33 0:00 php-fpm: pool www www-data 1476 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1477 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1478 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1479 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1483 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1484 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1486 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1488 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www www-data 1490 0.0 0.5 337844 5320 ? S 15:33 0:00 php-fpm: pool www root 1592 0.0 0.1 117216 1436 ? Ss 15:33 0:00 /usr/sbin/varnishd -P /var/run/varnishd.pid -a :80 -T localhost:6082 -f /etc/ www-data 1593 0.0 0.2 593584 2672 ? Sl 15:33 0:00 /usr/sbin/varnishd -P /var/run/varnishd.pid -a :80 -T localhost:6082 -f /etc/ root 1690 0.0 0.2 89132 2248 ? Ss 15:33 0:00 sendmail: MTA: accepting connections root 1751 0.0 0.3 73384 3672 ? Rs 15:35 0:00 sshd: root@pts/1 root 1767 0.0 0.2 20920 2132 pts/1 Ss 15:35 0:00 -bash root 1833 0.0 0.1 18112 1248 pts/1 R+ 15:51 0:00 ps aux

And my configuration was:

/etc/nginx/nginx.conf

user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; multi_accept on; use epoll; } http { # Let NGINX get the real client IP for its access logs set_real_ip_from 127.0.0.1; real_ip_header X-Forwarded-For; # Basic Settings sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 20; client_max_body_size 15m; client_body_timeout 60; client_header_timeout 60; client_body_buffer_size 1K; client_header_buffer_size 1k; large_client_header_buffers 4 8k; send_timeout 60; reset_timedout_connection on; types_hash_max_size 2048; server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/nginx/mime.types; default_type application/octet-stream; # Logging Settings # access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; # Log Format log_format main '$remote_addr - $remote_user [$time_local] ' '"$request" $status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; # Gzip Settings gzip on; gzip_static on; gzip_disable "msie6"; gzip_vary on; gzip_proxied any; gzip_comp_level 6; gzip_min_length 512; gzip_buffers 16 8k; gzip_http_version 1.1; gzip_types text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml application/rss+xml font/truetype application/x-font-ttf font/opentype application/vnd.ms-fontobject image/svg+xml; # Virtual Host Configs include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; }

php.ini

short_open_tag = Off ignore_user_abort = Off post_max_size = 15M upload_max_filesize = 15M default_charset = "UTF-8" allow_url_fopen = Off default_socket_timeout = 30 mysql.allow_persistent = Off [apc] apc.stat = "0" apc.max_file_size = "1M" apc.localcache = "1" apc.localcache.size = "64" apc.shm_segments = "1" apc.ttl = "3600" apc.user_ttl = "7200" apc.gc_ttl = "3600" apc.cache_by_default = "1" apc.filters = "" apc.write_lock = "1" apc.num_files_hint= "512" apc.user_entries_hint="4096" apc.shm_size = "64M" apc.mmap_file_mask=/tmp/apc.XXXXXX apc.include_once_override = "0" apc.file_update_protection="2" apc.canonicalize = "1" apc.report_autofilter="0" apc.stat_ctime="0" ;This should be used when you are finished with PHP file changes. ;As you must clear the APC cache to recompile already cached files. ;If you are still developing, set this to 1. apc.stat="0"

/etc/php5/fpm/pool.d/www.conf

user = www-data group = www-data listen = /var/run/php-fpm.socket listen.owner = www-data listen.group = www-data listen.mode = 0666 listen.allowed_clients = 127.0.0.1 pm = dynamic pm.max_children = 50 pm.start_servers = 15 pm.min_spare_servers = 5 pm.max_spare_servers = 25 pm.process_idle_timeout = 60s request_terminate_timeout = 30 security.limit_extensions = .php php_flag[display_errors] = off php_admin_value[error_reporting] = 0 php_admin_value[error_log] = /var/log/php5-fpm.log php_admin_flag[log_errors] = on php_admin_value[memory_limit] = 128M

/etc/default/varnish

DAEMON_OPTS="-a :80 \ -T localhost:6082 \ -f /etc/varnish/default.vcl \ -u www-data -g www-data \ -S /etc/varnish/secret \ -p thread_pools=2 \ -p thread_pool_min=25 \ -p thread_pool_max=250 \ -p thread_pool_add_delay=2 \ -p session_linger=50 \ -p sess_workspace=262144 \ -p cli_timeout=40 \ -s malloc,256m"
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  • You seem to have 1 GB RAM, not 512 MB. Commented May 15, 2013 at 15:13
  • I have burst memory = 1024 MB. But my vps should work with 512 mb only. Commented May 15, 2013 at 15:18

3 Answers 3

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Even after the changes suggested by @etagenklo, you have up to ten servers using 128 MB of PHP RAM apiece, plus another 64 MB of RAM for APC… that's more than 1G, right there, before you take into account any other sort of either overhead or per-process RAM usage.

At a guess, you need to trim down the memory usage of your PHP application; a memory limit of 128 MB is a limit, not a hard allocation, so you're actually using a large amount per process. A tool like XHProf or TraceView could help you identify where all that RAM is going. Otherwise, setting pm.max_children = 4 should keep you below 512 MB, even in the pathological case.

Of course, another solution to this is simply to get a bigger server. How many hours have you spent or will you spend debugging this? How much is your time worth? How much does a bit more memory cost?

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1

The values in your fpm-pool.conf seem way too high. Try something more like this:

pm.max_children = 10 pm.start_servers = 2 pm.min_spare_servers = 2 pm.max_spare_servers = 2
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  • root@s1:~# free -m total used free shared buffers cached Mem: 1024 1021 2 0 0 0 -/+ buffers/cache: 1021 2 Swap: 0 0 0 Commented May 15, 2013 at 15:15
  • Is this after editing you config? Did you restart php-fpm? What does the processlist look like afterwards? Commented May 15, 2013 at 15:21
  • the process list decreased but still using to much ram.. Commented May 15, 2013 at 15:38
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use php-fpm 

pm = ondemand pm.max_requests = 10000

and create some kind of swap

https://www.varnish-software.com/static/book/Tuning.html#storage-backends

these days there is no problem to get a bigger server/vps.

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