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POApache to slow to responde, but CPU and memory not max out
 

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  1. POApache to slow to responde, but CPU and memory not max out
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    <p><strong>The problem</strong></p> <p>2 <code>apache</code> servers have a long response time, but I do not see CPU or memory max out.</p> <p><strong>Details</strong></p> <p>I have 2 <code>apache</code> server servering static content for client.</p> <ul> <li>This web site has a lot of traffic. </li> <li>At high traffic I have ~10 request per second (html, css, js, images).</li> <li>Each HTML is making 30 other request to the servers for loading js, css, and images.</li> <li>Safari developer tool show that 2MB of that is getting transfer each time I hit a html page</li> <li>These two server are running on <code>Amazon Web Service</code></li> <li>both instances are m1.large (2 CPUS, 7.5 RAM)</li> <li>I'm serving images in the same server</li> <li>server are in US but a lot of traffic comes from Europe</li> </ul> <p><strong>I tried</strong></p> <ul> <li>changing from prefork to worker</li> <li>increasing processses</li> <li>increasing threads</li> <li>increasing time out</li> </ul> <p>I'm running benchmarks with <code>ab</code> (apachebench) and I do not see improvement.</p> <p><strong>My question are:</strong></p> <ul> <li>Is it possible that serving the images and large resorouces like js (400k) might be slowing down the server?</li> <li>Is it possible that 5 request per second per server is just too much traffic and there is no tuning I can do, so only solution is to add more servers?</li> <li>does <code>amazon web services</code> have a problem with bandwidth?</li> </ul> <h2>New Info</h2> <p><strong>My files are being read from a mounted directory on GlusterFS</strong></p> <p>Metrics collected with ab (apache bench) run on a EC2 instance on same network</p> <pre><code>Connections: 500 Concurrency: 200 Server with files on mounted directory (files on glusterfs) Request per second: 25.26 Time per request: 38.954 Transfer rate: 546.02 Server without files on mounted directory (files on local storage) Request per second: 1282.62 Time per request: 0.780 Transfer rate: 27104.40 </code></pre> <h2>New Question</h2> <p><strong>Is it possible that a reading the resources (htmls, js, css, images) from a mounted directory (NFS or GlusterFS) might slow down <em>dramatically</em> the performance of Apache?</strong></p> <p>Thanks</p>
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    1. COproviding the actual benchmarks would probably help... :P
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      1. USjondavidjohn
    2. COMight help to link your site here since folks that are experienced in website performance optimization can probably suggest any number of things right off the bat from looking at your source.
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      1. USMike Brant
    3. COHow do you load balance the work between the two servers? Are you using Elastic Load Balancer? Are you hosting both your servers in the same region? Did you try set up one of them in Europe region?
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      1. USGuy
 

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