Maybe it's just opening the socket to memcached for the first time after being idle? One of the Java clients (maybe both) has a socket connection pool, and I could see this being the case.<br><br><div><span class="gmail_quote">
On 10/26/07, <b class="gmail_sendername">K J</b> <<a href="mailto:sanbat@gmail.com">sanbat@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<div>Depending on the language and runtime, you could almost count on it while libraries load and initialize and jits optimize.</div>
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<div>Testers usually include some ramp-up time where things sort of warm-up before you actually start capturing metrics.</div></div></blockquote></div></div>
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<div>So it's normal to have Memcache's response time be 1 second, if the system is relatively idle? This happens when I'm basically the only user on the system, logging in, checking pages, etc.</div><div><span class="e" id="q_115dfb764f7a8e6a_2">
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<div><span class="gmail_quote">On 10/27/07, <b class="gmail_sendername">Dustin Sallings</b> <<a href="mailto:dustin@spy.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">dustin@spy.net</a>> wrote:
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<div> Depending on the language and runtime, you could almost count on it while libraries load and initialize and jits optimize.</div>
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<div> Testers usually include some ramp-up time where things sort of warm-up before you actually start capturing metrics.<br><br>--
<div><span>Dustin Sallings (mobile)</span></div></div>
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<div><br>On Oct 26, 2007, at 20:24, "K J" <<a href="mailto:sanbat@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">sanbat@gmail.com</a>> wrote:<br><br> </div>
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<div>Ok I tested this, and found that the very first memcache get request always takes up 1 second. All subsequent gets in the same page are fast. Does anyone know what could cause the first memcache get request to slow down like this?
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<div><span class="gmail_quote">On 10/25/07, <b class="gmail_sendername">John Kramlich</b> <<a href="mailto:john.kramlich@gigoit.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)"></a><a href="mailto:john.kramlich@gigoit.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
john.kramlich@gigoit.org</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">J A wrote:<br>> In my application I've noticed something weird. When testing it with
<br>> one user, the memcached page loads in like 1 second, but when I use a
<br>> load testing software and put 20 simultaneous users on it, the page<br>> load goes to 0.01 second, even though the server load has gone up.<br>><br>> I'm puzzled by this. Anyone have similar experiences?
<br>><br><br>What load testing software are you using and what happens if you<br>configure that load testing software to emulate only a single user? If<br>you are running something like siege locally on your server then network
<br>latency would be much lower than if you were running the same program on<br>a remote machine. That may be what makes the page load more slowly.<br><br>You may also want to profile you code and see how long returning results
<br>from memcache takes. If using PHP you can get a benchmarking class from<br>PEAR and set start and stop markers before and after you memcache<br>related code. Then you can output the number of milliseconds it takes<br>
to execute that code. You can do this for other parts of your code as<br>well. It certainly helps when figuring out where to spend time optimizing.<br><br>- John Kramlich<br>------------------------------<br><a href="http://www.gigoit.org/" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
</a><a href="http://www.gigoit.org/" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://www.gigoit.org</a> - Give and get free items within your community<br></blockquote></div><br> </div></blockquote>
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