Tagged Questions

1
vote
3answers
117 views

How to make a vm scale when demand for resource increases

i am having a server with 16 virtual core and 24G RAM,using Xen virtualization and ubuntu as dom0 Created 4 VMs (in para mode),each with different applications. CPU Load vary on each vm,somtimes ...
1
vote
3answers
1k views

Maximizing TCP connections on HAProxy load balancer

I am currently using HAProxy in order to load balance tcp connections from clients to my Erlang app server. The connection is persistent, which means I'm limited to roughly 64K clients on an optimized ...
4
votes
3answers
175 views

First steps in scaling servers up for a Ruby on Rails application

I'm running a RoR web application on a dual core AMD Athlon 4450e server w/ 8GB RAM and Ubuntu. It's doing alright, getting spikes up to 320 dynamic requests per minute, it's also handling all the ...
6
votes
5answers
1k views

How to identify heavy write to disk?

I have this problem with server running CakePHP application. The server is insanely slow, I first thought that it's application problem, but then I found constant 5-6MB/s write to disk. What is the ...
40
votes
9answers
71k views

What limits the maximum number of connections on a Linux server?

What kernel parameter or other settings control the maximum number of TCP sockets that can be open on a Linux server? What are the tradeoffs of allowing more connections? I noticed while load testing ...
15
votes
4answers
4k views

Which database server scales better: PostgreSQL or MySQL?

I'm working on a website that could eventually have a very large database. The website will be an art community not until deviantART. I'll be running a lot of queries for analyzing how the site is ...