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Posted to user@cassandra.apache.org by "Hagos, A.S." <A....@tue.nl> on 2012/10/12 10:23:03 UTC
what is more important (RAM vs Cores)
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
Re: what is more important (RAM vs Cores)
Posted by "B. Todd Burruss" <bt...@gmail.com>.
i would not worry as much about the single machine specs. find the
sweet spot on price for CPU and RAM and by that, then scale horizontal
to meet your demand.
but .. if i was pressed for a general statement -choose RAM over CPU
On Fri, Oct 12, 2012 at 4:34 AM, Serge Fonville
<se...@gmail.com> wrote:
> It seems you RAM/core ratio is different between your options.
>
> So if those two are your only options I'd suggest the 16GB option.
>
> Still, the other things
> * Concurrency
> * Fit in ram
> * IO
>
> Are very relevant.
>
> HTH
>
> Kind regards/met vriendelijke groet,
>
> Serge Fonville
>
> http://www.sergefonville.nl
>
> Convince Microsoft!
> They need to add TRUNCATE PARTITION in SQL Server
> https://connect.microsoft.com/SQLServer/feedback/details/417926/truncate-partition-of-partitioned-table
>
>
>
> 2012/10/12 Romain HARDOUIN <ro...@urssaf.fr>
>>
>>
>> Also, take into account i/o since they are often a limiting factor.
>
>
Re: what is more important (RAM vs Cores)
Posted by Serge Fonville <se...@gmail.com>.
It seems you RAM/core ratio is different between your options.
So if those two are your only options I'd suggest the 16GB option.
Still, the other things
* Concurrency
* Fit in ram
* IO
Are very relevant.
HTH
Kind regards/met vriendelijke groet,
Serge Fonville
http://www.sergefonville.nl
Convince Microsoft!
They need to add TRUNCATE PARTITION in SQL Server
https://connect.microsoft.com/SQLServer/feedback/details/417926/truncate-partition-of-partitioned-table
2012/10/12 Romain HARDOUIN <ro...@urssaf.fr>
>
> Also, take into account i/o since they are often a limiting factor.
RE: what is more important (RAM vs Cores)
Posted by Romain HARDOUIN <ro...@urssaf.fr>.
Also, take into account i/o since they are often a limiting factor.
RE: what is more important (RAM vs Cores)
Posted by Tim Wintle <ti...@gmail.com>.
On Fri, 2012-10-12 at 10:20 +0000, Viktor Jevdokimov wrote:
> IMO, in most cases you'll be limited by the RAM first.
+1 - I've seen our 8-core boxes limited by RAM and inter-rack
networking, but not by CPU (yet).
Tim
RE: what is more important (RAM vs Cores)
Posted by Viktor Jevdokimov <Vi...@adform.com>.
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
Disclaimer: The information contained in this message and attachments is intended solely for the attention and use of the named addressee and may be confidential. If you are not the intended recipient, you are reminded that the information remains the property of the sender. You must not use, disclose, distribute, copy, print or rely on this e-mail. If you have received this message in error, please contact the sender immediately and irrevocably delete this message 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 <wl...@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....@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.
RE: what is more important (RAM vs Cores)
Posted by "Hagos, A.S." <A....@tue.nl>.
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 <wl...@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....@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.
Re: what is more important (RAM vs Cores)
Posted by Romain HARDOUIN <ro...@urssaf.fr>.
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 <wl...@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....@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.
Re: what is more important (RAM vs Cores)
Posted by wang liang <wl...@gmail.com>.
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....@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.