anyone know best practices for running redis as a virtual machine

[Jak Sprats]

My questions are
1.) best operating system for Virtual Machine - guessing stripped down
debian
2.) best host operating system - guessing linux
3.) best hypervisor (e.g. Vmware, KVM, Parallels, Xen, etc...)
4.) any tricks to up performance

redis is I/O bound, so I imagine the best combo of 1,2,3 in terms of
network performance is the sweet spot.

Anyone have any data on this?

[Jeremy Zawodny]

Just reasoning through it, as opposed to actually trying it (I'm not a big VM fan), most Redis ops are so fast, that any overhead introduced by running it in a VM will likely be a measurable performance decrease.  Compare this with something like ImageMagick running in a VM as a web service for resizing images that users upload.

Having said that, are you trying to optimize for speed?  Throughput?  Size/capacity?

Jeremy

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[Jak Sprats]

HI Jeremy,

>> Im not a big VM fan
I am mixed VM fan, I used to work at a company riding the VM wave and
after I finished there I wrote: http://www.allinram.info/Virtualisation.html
(a 5 pager that noo ne has ever completely read:) The conclusion was
basically, hard disk's do not virtualise due to disk seek contention
between VMs, so running an app 100% in the cloud will work as long as
you dont need a hard disk (which is a killer for databases) or your
cloud provider supports SSDs (may exist now).

That said, redis w/ virtual-memory turned off runs in a VM like a
champ (because it avoids hard disk seeks)

I am trying to optimise for speed and thruput, (lots of req/s and low
concurrency) and ultimately having 2 redis VMs running on the same
physical host would have each running at close to 50% max req/s, 4
instance -> each runs at 25% max req/s, etc....

ImageMagick as a webserver is analagous, but ImageMagick ops use up
lots of CPU and are minimum several K in terms of request/response,
but the idea of reading up on similar applications performance in VMs
is a good starting point. It is hard to find an application w/ similar
resource usage patterns to redis.
The problem w/ stats on databases running in VMs is disk plays a
dominant role so the stats are useless for non-virtual-memory redis
instances. Maybe some of the in-memory-databases have written up their
findings.

I was just hoping somebody had experimented w/ redis as a VM, there
are a lot of variables to take into account to find the perfect VM
fit.

- Jak

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