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PODotNetZip performance issue, but only on one specific server
 

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    <p>I'm having a wierd performance problem with the DotNetZip library.</p> <p>In the application (which runs under asp.net) i'm reading a set of files from the database and packs them on-the-fly into a zip file for the user to download.</p> <p>Everything works fine on my development laptop. A zip file being about 10MB with default compression rate takes something around 5 seconds to finish. However, on the dev server at the customer, the same set of files takes around 1-2 minutes to compress. I've even experienced even longer times, up to several minutes. The CPU utilization is 100% when the zipping is running, but otherwise it stays around 0%, so it's not due to overload.</p> <p>What's even more interesting is that on the production server, it takes something about 20 seconds to finish.</p> <p>Where should I start looking?</p> <p>Some hardware specs:</p> <p><strong>My Laptop</strong></p> <p>Development environment running on a virtualbox with 2 cores and 4GB RAM dedicated.</p> <ul> <li>Core i5 M540 2,5GHz</li> <li>8 GB RAM</li> <li>Win7</li> </ul> <p><strong>Dev Server</strong></p> <p>According to properties dialog on My Computer (probably virtualized)</p> <ul> <li>Intel Xeon 5160 3GHz</li> <li>540MB RAM</li> <li>Windows 2003 Server</li> </ul> <p>Task Manager Reports Single Core</p> <p><strong>Production Server</strong></p> <p>According to properties dialog on My Computer (probably virtualized)</p> <ul> <li>Xenon 5160 3GHz</li> <li>512MB RAM</li> <li>Windows 2003 Server</li> </ul> <p>Task Manager Reports Dual Core</p> <p><strong>Update</strong> The servers are running on a VMWare host. Found the VMWare icon hiding in the taskbar.</p>
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    1. USJeff
    1. USAnttu
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    1. COvirus scanner?....
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    2. COboth servers are running virus scanners, which also my laptop does.
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    3. CO**different** virus scaner? :-) Other options: non-local files on server (the files aren't really on the server, they are *accessible* from the server and they are in the LAN)
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      1. USxanatos
 

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