lamp performance Post: 302246765

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Top Forums Web Development lamp performance Post 302246765 by manifesto on Tuesday 14th of October 2008 10:50:00 AM

10-14-2008

Registered User

Thanks for you answers.

My apache version is : Apache/2.0.52 with 4x2.8 mhz xeon with 3gb RAM and 2gb swap.
On dev I got VM machine with 2x1.86Mhz xeon and 2.5gb RAM and 2Gb swap (I do all tests there).

99% of the traffic is when users starts their browser around 9h.
A lot of connections (may be 1000 users).

I do my tests on dev with curl and ab but did not experience any swap pb (i did not start more than 100 thread each time).

I use eaccelerator for cache because of my boss choice, I tried mmcache and got slightly better results.

1a : I will try APC.

1b : as typo3 is php script and home page is index.php I wonder how squid will help. I thought that squid is not easy to setup, is it worth to try ??

2a : I agree with you better having 503 than swapping.
I understand vm.swappiness, but it's not clear on what you say about tunning swap, is it trying different values on swappiness ? It looks tricky :-)

2b : Some parameters are not clear for me especially ServerLimit/maxclient. I am a little bit reluctant to change that as I am not sure of what I am doing. I'l take deeper look in documentation.
keepalive is on and I will try to play with the value.
But most of my connections are 1 time connection, user start browser ask home page and that's all.
For 1 connection like that I was gessing that I do not need a high keepalive as I got only 1 http request, I am right ?
Is there any relation between tcp keepalive and apache keepalive ?

Finally as I tried to emphasize, I got 99% request on the same page which is dynamic page BUT do not change 99% of the time.
Can I cache that kind of things in any proxy or cache to avoid going thru all the layers (browser httpd mysql httpd ...).

And as otheus said I rather like to have 503 but quick response than having server crashing.
Maybe the swap tuning is my best help in this case ???

My disk are internal HD that I can't change.

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squid

squid(8)						      System Manager's Manual							  squid(8)

NAME

       squid - proxy caching server

SYNOPSIS

       squid [ -dhsvzCDFNRVYX ] [ -f config-file ] [ -[ au ] port ] [ -k  signal ]

DESCRIPTION

       squid  is  a  high-performance  proxy  caching  server  for web clients, supporting FTP, gopher, and HTTP data objects.	Unlike traditional
       caching software, squid handles all requests in a single, non-blocking, I/O-driven process.

       squid keeps meta data and especially hot objects cached in RAM, caches DNS lookups, supports non-blocking DNS lookups, and implements nega-
       tive caching of failed requests.

       squid  supports	SSL,  extensive access controls, and full request logging.  By using the lightweight Internet Cache Protocol, squid caches
       can be arranged in a hierarchy or mesh for additional bandwidth savings.

       squid consists of a main server program squid, a Domain Name System lookup program dnsserver, some optional programs for rewriting requests
       and  performing	authentication,  and some management and client tools.	When squid starts up, it spawns a configurable number of dnsserver
       processes, each of which can perform a single, blocking Domain Name System (DNS) lookup.  This reduces the amount of time the  cache  waits
       for DNS lookups.

       squid is derived from the ARPA-funded Harvest Project http://harvest.cs.colorado.edu/

       This  manual page only lists the command line arguments.  For details on how to configure squid see the file /etc/squid/squid.conf, the FAQ
       included with the distribution and the documentation at the squid home page http://www.squid-cache.org

OPTIONS

       -a port
	      Specify HTTP port number (default: 3128).

       -d level
	      Write debugging to stderr also.

       -f file
	      Use the given config-file instead of /etc/squid/squid.conf

       -h     Print help message.

       -k reconfigure | rotate | shutdown | interrupt | kill | debug | check | parse
	      Parse configuration file, then send signal to running copy (except -k parse) and exit.

       -s     Enable logging to syslog.

       -u port
	      Specify ICP port number (default: 3130), disable with 0.

       -v     Print version.

       -z     Create swap directories

       -C     Do not catch fatal signals.

       -D     Disable initial DNS tests.

       -F     Don't serve any requests until store is rebuilt.

       -N     No daemon mode.

       -R     Do not set REUSEADDR on port.

       -V     Virtual host httpd-accelerator.

       -X     Force full debugging.

       -Y     Only return UDP_HIT or UDP_MISS_NOFETCH during fast reload.

FILES

       /etc/squid/squid.conf
	      The main configuration file.  You must initially make changes to this file for squid to work.  For example, the  default	configura-
	      tion does not allow access from any browser.

								 squid version 2.0							  squid(8)