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From Viktor Jevdokimov <Viktor.Jevdoki...@adform.com>
Subject RE: what is more important (RAM vs Cores)
Date Fri, 12 Oct 2012 10:20:29 GMT
IMO, in most cases you'll be limited by the RAM first.
Take into account size of sstables, you will need to keep bloom filters and indexes in RAM
and if it will not fit, 4 cores, or 24 cores doesn't matter, except you're on SSD.

You need to design first, stress test second, conclude last.


Best regards / Pagarbiai

Viktor Jevdokimov
Senior Developer

Email: Viktor.Jevdokimov@adform.com
Phone: +370 5 212 3063
Fax: +370 5 261 0453

J. Jasinskio 16C,
LT-01112 Vilnius,
Lithuania



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and any copies.> -----Original Message-----
> From: Hagos, A.S. [mailto:A.S.Hagos@tue.nl]
> Sent: Friday, October 12, 2012 12:17
> To: user@cassandra.apache.org
> Subject: RE: what is more important (RAM vs Cores)
>
> Hi there,
> My application is uses Cassandra to store abstracted sensor data from a
> sensor network in large building (up to 3000 sensors).
> For now I am starting one node in one floor of the building, for the future it
> will definitely be a cluster. Some of the sensors have up 16HZ sampling rate.
>
> And now I want to make a decision if I have to focus on big RAM or large
> number of cores.
> greetings
> Ambes
> ________________________________________
> From: Romain HARDOUIN [romain.hardouin@urssaf.fr]
> Sent: Friday, October 12, 2012 10:57 AM
> To: user@cassandra.apache.org
> Subject: Re: what is more important (RAM vs Cores)
>
> Hi,
>
> Sure it depends... but IMHO 6 GB is suboptimal for big data because it means
> 1,5 GB or  2 GB for Cassandra.
> Maybe you could elaborate your use case. You really want a one node cluster
> ?
>
> cheers,
> Romain
>
> wang liang <wlahhn@gmail.com> a écrit sur 12/10/2012 10:36:15 :
>
> > Hi, Hagos,
> >
> > I think it depends on your business case. Big RAM reduce latency and
> > improve responsibility, High number of cores increase concurrency of
> > your app. thanks.
>
> > On Fri, Oct 12, 2012 at 4:23 PM, Hagos, A.S. <A.S.Hagos@tue.nl> wrote:
> > Hi All,
> > For of my projects I want to buy a machine to host Casssandra database.
> > The options I am offered are machines with 16GB RAM with Quad-Core
> > processor and 6GB RAM with Hexa-Core processor.
> > Which one do you recommend, big RAM or  high number of cores?
> >
> > greetings
> > Ambes
> >
>
> >
> > --
> > Best wishes,
> > Helping others is to help myself.


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