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Bill Christenson
Bill Christenson

Reputation: 819

Azure Cache (Preview) OutputCache - High CPU - Slow

I have an MVC 4 (Razor) website and I've enabled Azure Cache (Preview) (Co-Located) for both the session and the outputCache providers. Since I enabled it, each web request causes a massive CPU spike and results in 3-5 second page response times while debugging.

I have narrowed the problem down to the outputCache provider. If I disable it in the web.config, the site runs great. No CPU spikes. I am not using page output caching yet... so no reads/writes should be occurring. The session provider runs fine via Azure Cache (Preview). Below is my outputCache config. If I disable it, the site runs without CPU spikes. Any thoughts?

<caching>
  <outputCache defaultProvider="DistributedCache">
    <providers>
      <add name="DistributedCache" type="Microsoft.Web.DistributedCache.DistributedCacheOutputCacheProvider, Microsoft.Web.DistributedCache" cacheName="default" dataCacheClientName="default" />
    </providers>
  </outputCache>
</caching>

Upvotes: 4

Views: 1491

Answers (1)

Bill Christenson
Bill Christenson

Reputation: 819

It appears the issue is due to the Web Optimization Framework. It does not have server caching enabled for non-default cache providers (e.g. Azure Cache Preview). So each time a request is made, the web server has to rebundle which is causing the CPU spikes. A future version of Microsoft.AspNet.Web.Optimization should enable server caching again.

Here's the issue on on CodePlex.

Upvotes: 4

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