My setup is:
Intel® Core™ i7-2600 and RAM 16 GB DDR3 RAM
varnish+nginx+php-fpm+apc for a not very heavy WordPress blog with W3 Total Cache and CDN
My problem is that after 55 hits per second according to blitz.io varnish starts giving out timeouts. CPU usage at this time is hardly 1%. Free memory at all time remains 10GB+.
I tried benchmarking php-fpm directly with result of 150hits/s without any timeouts. But after that the CPU usage goes 100% and it stops responding.
Can you help me optimize it to handle more?
As i understand nginx has nothing to do over here so i dont put its config.
php-fpm config
listen = /tmp/php5-fpm.sock
listen.allowed_clients = 127.0.0.1
user = nginx
group = nginx
pm = dynamic
pm.max_children = 150
pm.start_servers = 7
pm.min_spare_servers = 2
pm.max_spare_servers = 15
pm.max_requests = 500
slowlog = /var/log/php-fpm/www-slow.log
php_admin_value[error_log] = /var/log/php-fpm/www-error.log
php_admin_flag[log_errors] = on
apc
extension = apc.so
apc.enabled=1
apc.shm_size=512MB
apc.num_files_hint=0
apc.user_entries_hint=0
apc.ttl=7200
apc.use_request_time=1
apc.user_ttl=7200
apc.gc_ttl=3600
apc.cache_by_default=1
apc.filters
apc.mmap_file_mask=/tmp/apc.XXXXXX
apc.file_update_protection=2
apc.enable_cli=0
apc.max_file_size=1M
apc.stat=1
apc.stat_ctime=0
apc.canonicalize=0
apc.write_lock=1
apc.report_autofilter=0
apc.rfc1867=0
apc.rfc1867_prefix =upload_
apc.rfc1867_name=APC_UPLOAD_PROGRESS
apc.rfc1867_freq=0
apc.rfc1867_ttl=3600
apc.include_once_override=0
apc.lazy_classes=0
apc.lazy_functions=0
apc.coredump_unmap=0
apc.file_md5=0
apc.preload_path
Varnish VCL
backend default {
.host = "127.0.0.1";
.port = "8080";
.connect_timeout = 6s;
.first_byte_timeout = 6s;
.between_bytes_timeout = 60s;
}
acl purgehosts {
"localhost";
"127.0.0.1";
}
# Called after a document has been successfully retrieved from the backend.
sub vcl_fetch {
# Uncomment to make the default cache "time to live" is 5 minutes, handy
# but it may cache stale pages unless purged. (TODO)
# By default Varnish will use the headers sent to it by Apache (the backend server)
# to figure out the correct TTL.
# WP Super Cache sends a TTL of 3 seconds, set in wp-content/cache/.htaccess
set beresp.ttl = 24h;
# Strip cookies for static files and set a long cache expiry time.
if (req.url ~ "\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pdf|txt|tar|wav|bmp|rtf|js|flv|swf|html|htm)$") {
unset beresp.http.set-cookie;
set beresp.ttl = 24h;
}
# If WordPress cookies found then page is not cacheable
if (req.http.Cookie ~"(wp-postpass|wordpress_logged_in|comment_author_)") {
# set beresp.cacheable = false;#versions less than 3
#beresp.ttl>0 is cacheable so 0 will not be cached
set beresp.ttl = 0s;
} else {
#set beresp.cacheable = true;
set beresp.ttl=24h;#cache for 24hrs
}
# Varnish determined the object was not cacheable
#if ttl is not > 0 seconds then it is cachebale
if (!beresp.ttl > 0s) {
# set beresp.http.X-Cacheable = "NO:Not Cacheable";
} else if ( req.http.Cookie ~"(wp-postpass|wordpress_logged_in|comment_author_)" ) {
# You don't wish to cache content for logged in users
set beresp.http.X-Cacheable = "NO:Got Session";
return(hit_for_pass); #previously just pass but changed in v3+
} else if ( beresp.http.Cache-Control ~ "private") {
# You are respecting the Cache-Control=private header from the backend
set beresp.http.X-Cacheable = "NO:Cache-Control=private";
return(hit_for_pass);
} else if ( beresp.ttl < 1s ) {
# You are extending the lifetime of the object artificially
set beresp.ttl = 300s;
set beresp.grace = 300s;
set beresp.http.X-Cacheable = "YES:Forced";
} else {
# Varnish determined the object was cacheable
set beresp.http.X-Cacheable = "YES";
if (beresp.status == 404 || beresp.status >= 500) {
set beresp.ttl = 0s;
}
# Deliver the content
return(deliver);
}
sub vcl_hash {
# Each cached page has to be identified by a key that unlocks it.
# Add the browser cookie only if a WordPress cookie found.
if ( req.http.Cookie ~"(wp-postpass|wordpress_logged_in|comment_author_)" ) {
#set req.hash += req.http.Cookie;
hash_data(req.http.Cookie);
}
}
# vcl_recv is called whenever a request is received
sub vcl_recv {
# remove ?ver=xxxxx strings from urls so css and js files are cached.
# Watch out when upgrading WordPress, need to restart Varnish or flush cache.
set req.url = regsub(req.url, "\?ver=.*$", "");
# Remove "replytocom" from requests to make caching better.
set req.url = regsub(req.url, "\?replytocom=.*$", "");
remove req.http.X-Forwarded-For;
set req.http.X-Forwarded-For = client.ip;
# Exclude this site because it breaks if cached
if ( req.http.host == "sr.ituts.gr" ) {
return( pass );
}
# Serve objects up to 2 minutes past their expiry if the backend is slow to respond.
set req.grace = 120s;
# Strip cookies for static files:
if (req.url ~ "\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pdf|txt|tar|wav|bmp|rtf|js|flv|swf|html|htm)$") {
unset req.http.Cookie;
return(lookup);
}
# Remove has_js and Google Analytics __* cookies.
set req.http.Cookie = regsuball(req.http.Cookie, "(^|;\s*)(__[a-z]+|has_js)=[^;]*", "");
# Remove a ";" prefix, if present.
set req.http.Cookie = regsub(req.http.Cookie, "^;\s*", "");
# Remove empty cookies.
if (req.http.Cookie ~ "^\s*$") {
unset req.http.Cookie;
}
if (req.request == "PURGE") {
if (!client.ip ~ purgehosts) {
error 405 "Not allowed.";
}
#previous version ban() was purge()
ban("req.url ~ " + req.url + " && req.http.host == " + req.http.host);
error 200 "Purged.";
}
# Pass anything other than GET and HEAD directly.
if (req.request != "GET" && req.request != "HEAD") {
return( pass );
} /* We only deal with GET and HEAD by default */
# remove cookies for comments cookie to make caching better.
set req.http.cookie = regsub(req.http.cookie, "1231111111111111122222222333333=[^;]+(; )?", "");
# never cache the admin pages, or the server-status page, or your feed? you may want to..i don't
if (req.request == "GET" && (req.url ~ "(wp-admin|bb-admin|server-status|feed)")) {
return(pipe);
}
# don't cache authenticated sessions
if (req.http.Cookie && req.http.Cookie ~ "(wordpress_|PHPSESSID)") {
return(lookup);
}
# don't cache ajax requests
if(req.http.X-Requested-With == "XMLHttpRequest" || req.url ~ "nocache" || req.url ~
"(control.php|wp-comments-post.php|wp-login.php|bb-login.php|bb-reset-password.php|register.php)") {
return (pass);
}
return( lookup );
}
Varnish Daemon options
DAEMON_OPTS="-a :80 \
-T 127.0.0.1:6082 \
-f /etc/varnish/ituts.vcl \
-u varnish -g varnish \
-S /etc/varnish/secret \
-p thread_pool_add_delay=2 \
-p thread_pools=8 \
-p thread_pool_min=100 \
-p thread_pool_max=1000 \
-p session_linger=50 \
-p session_max=150000 \
-p sess_workspace=262144 \
-s malloc,5G"
Im not sure where to start, should i for start optimize php-fpm and then go to varnish or php-fpm is at its max right now so i should start looking for the problem in varnish?
