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From Joan Touzet <woh...@apache.org>
Subject Re: Respawning server died, can't figure out why
Date Tue, 20 Aug 2013 16:41:39 GMT
On Tue, Aug 20, 2013 at 09:48:59AM -0500, Nathan Vander Wilt wrote:
> Thanks for these suggestions, Joan. Unfortunately it seems the server is under quite
the opposite situation though: this is an m1.medium instance 

Smoking gun. AWS instances are notorious for bad disk throughput.
Ultimately, CouchDB is heavily driven by disk performance.

If your instance is EBS-backed, You're going to observe a ton of
latency and worse; it's a bit of an open secret that Amazon's
internal networking is oversubscribed, especially in us-east.

You can prove it to yourself by swapping out this instance temporarily
with a physical machine with approximately the same configuration.
m1.medium is 1 CPU, 4GB of RAM, so your average laptop - try booting
Linux from a thumb drive and running off of a dedicated HDD, even over
USB. You'll find it performs significantly faster.

If this works well, you can try running AWS instances from ephemeral
storage instead of EBS for a bit of a boost, but you'll still be running
into other unknowns on the backend. You may want to consider VMs from
other companies in nearby data centers if you have your infrastructure
in us-east-1, such as SoftLayer's Washington DC data center, NAC in NJ
or Rackspace in Chicago.

Good luck,
Joan

-- 
Joan Touzet | joant@atypical.net | wohali everywhere else

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