Not an issue. a Xen domU (guest) sees its dedicated memory the same as s dedicated installation of Linux. When you do file intensive operations writes are buffered in memory so when you read the file you read from the memory instead of having to do disk operations. When you do a copy of a file, it is much slower on a system with low memory as on a system with more memory the copy is complete after it is buffered into memory. In the background it is still writing to disk, If you try to read the new file you still read it fine as it is reading from that buffered/cached memory. It works out great. There is no problem at all with the buffering and caching.

Compare these results with Varnish and Apache 2.4.1.

mustafa - But what will the MaxClients be set to? max-spare is useless when talking about max memory usage.

3. add php-fpm on apache but still with 1 pool only (fastcgi finalty for setting with more than 1 pool) -- waiting for Apache 2.4.x and than change mod_fastcgi to mod_proxy_fcgi

mustafaramadhan wrote on Sat, 18 February 2012 01:37

3. add php-fpm on apache but still with 1 pool only (fastcgi finalty for setting with more than 1 pool) -- waiting for Apache 2.4.x and than change mod_fastcgi to mod_proxy_fcgi

I would use the official FastCGI module for Apache 2 (mod_fcgid) instead

mod_fastcgi has plenty of stability issues, while the current release of mod_fcgid is stable.

I must say, on low spec vps i cant see any diff between apache and nginx proxy in any given configuration....

In my opinion, it's better use php-fpm with mod_proxy_fcgi (coming with Apache 2.4.x) instead mod_fastcgi or mod_fcgid.

/etc/httpd/conf.d/~lxcenter.conf

<IfModule prefork.c>
	StartServers 2
	MinSpareServers 5
	MaxSpareServers 10
	ServerLimit 10
	MaxClients 10
	MaxRequestsPerChild 2000
	MaxMemFree 5
	SendBufferSize 65536
	ReceiveBufferSize 65536
</IfModule>

did everything all right? when the memory full, my webpage displayed 500 error frequently.

Hi salam,

Just to share some information after a few days looking for the problem which refer to my previous problem. Hope this will helping other who had same issue as mine. I did everything including adjusting httpd.conf and all, but seem the problem was not solve. Then I found the real problem was originally from xcache. Disabling xcache in php did solve the memory issue. Now even I got high traffic. Ram still below 400 mb. I did change some configuration to fully optimize web suited with the normal traffic.

hope this information could help other. I just had 1 other problem unsolved, I did click on my awstats on kloxo domain, then my browser downloading awstats.pl, it not showing the stat. what is the problem? is that because of enabling nginx? thanks