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Is it time to add a server

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http://serverfault.com – This question is about figuring out is horizontal scaling by adding servers is the next step or not. Here is the context: About 1400 concurrent users at peak time (between 11:00am-4:00pm) in Google Analytics Real-time stats. And it also show spikes of up to 75 pages per second and average per minute of about 1000. New Relic logs show average 25ms for each request (11ms in DB for 6 requests per page, 14ms in PHP). To me, that means each page will take 25ms and so, the server can sustain 400 pages per second of sustained traffic. Practically all long queries that could be cached in memory ar (HowTos)

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Submitted by taskli on 02/23/2013 – Made popular on 02/23/2013

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On average, my PHP page generation time is 10ms. So i should be able to execute 100 requests one after the other one (using a single core on the server, since that php is not multithreaded).

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Possible Duplicate: How do you do Load Testing and Capacity Planning for Databases

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CentOS Web Server is very slow 35 weeks 3 days ago

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example:

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This should automatically sho