Re: VPS 1 core vs 2 cores

[James Dugger]

This all depends on the load your planning on putting on the web server.
Assuming you are using Apache as your web server, Apache forks a new
process (thread) for every web request.  Drupal uses (my experience)
between 20MB - 70MB per process.  Total capacity (number of processes or
MaxClients) that the web server can handle is (in simple terms) estimated
by the following:

Total num of processes (maxClients)  = *Available RAM divided by AVG size
of process
i.e.  Web Server with 8GB of RAM (Assume 6GB Available RAM) running Drupal
at an AVG process size of 45MB.
6GB / 45MB = 133 - 134 concurrent processes (*Other 2GB used by OS, and
other applications running in background, this is just a guess.)

For this server it doesn't matter if you have 1, 2, or 16 cores the maximum
volume of simultaneous processes that Apache can handle is 133 - 134.

Additional cores allow more than one Apache thread to be processed at the
same time.  Since an Apache process is blocking until it returns a response
the core is unavailable to other processes until the current process has
completed.  Since all Drupal requests given to Apache require a call to the
DB (As you say assuming no caching), this simply lengthens the time that a
process will remain blocked.

The key is how fast are the page request coming in (load on the web
server).  A Drupal request can take 100 to 1000 times longer to return the
request than say a static web page.  While more cores will speed up the
rate of returned processes, they will do so at a diminishing rate of
return.  However additional RAM is fairly linear in expanding the number of
processes Apache can fork.  The best answer is as much of both.  But with
the understanding that you should probably have no less than 2 cores for a
production site, I'd go more RAM first.

My two cents.








On Tue, Sep 8, 2015 at 1:44 PM, Sesso  wrote:

> I would also say at least 2 cores and 4GB RAM. We have many clients that
> try to run 1 core with bare minimum RAM and their VPS does not run well.
> Especially when it's magento or opencart.
>
> Jason
>
> Sent from my iPhone
>
> On Sep 8, 2015, at 1:26 PM, Kevin Fries  wrote:
>
> 1 core, 2 cores, 2GB RAM, 4GB RAM, the question is only relevant if you
> have no expandability.  Select your software, take its recommendation, and
> probably a little more, then make sure you can grow as needed.
>
> Here is an example.
>
> Let's say you go to AWS, get a server that is large enough to handle
> Magento.  Your up, and in business.  Now, business is good.  Get another
> instance and split off your database.  Business continues to grow, and you
> need a bigger Megento instance.  No problem, snapshot your store, build a
> bigger instance, move your elastic IP, and retire your old one.
>
> As long as you have the ability to grow, just worry about getting
> something that gets you in the game.
>
> Kevin
> On Sep 8, 2015 2:06 PM, "Keith Smith"  wrote:
>
>>
>> Hi,
>>
>> I am wondering what your opinion is on cores and RAM when using a VPS.
>>
>> I am thinking about this in the context of Drupal and Magento, both of
>> who are resource hogs.
>>
>> I was told more RAM is much more valuable on a VPS than is the number of
>> cores.
>>
>> I'm assuming 4G of RAM is enough to not go into swap.  I'm thinking this
>> should be fine for a production site with moderate traffic running either
>> Drupal or Magento.
>>
>> As you know more cores means more money when it comes to VPS servers,
>> while RAM is cheap.
>>
>> Of course we know opcode cache, varnish, and memcache(d) can work wonders
>> in speeding up websites. For this discussion lets assume we are using none
>> of them.
>>
>> The question is, will a second core make all that much difference if
>> enough RAM is present to not use swap?  How would I know I need a second
>> core - look at the load?
>>
>> And is there other consideration or things I should be looking at?
>>
>> Thank you very much for all your feedback!!
>>
>> Keith
>>
>>
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-- 
James

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Re: VPS 1 core vs 2 cores

[Sesso]

I would also say at least 2 cores and 4GB RAM. We have many clients that try to 
run 1 core with bare minimum RAM and their VPS does not run well. Especially 
when it's magento or opencart. 

Jason

Sent from my iPhone

> On Sep 8, 2015, at 1:26 PM, Kevin Fries  wrote:
> 
> 1 core, 2 cores, 2GB RAM, 4GB RAM, the question is only relevant if you have 
> no expandability.  Select your software, take its recommendation, and 
> probably a little more, then make sure you can grow as needed.
> 
> Here is an example.
> 
> Let's say you go to AWS, get a server that is large enough to handle Magento. 
>  Your up, and in business.  Now, business is good.  Get another instance and 
> split off your database.  Business continues to grow, and you need a bigger 
> Megento instance.  No problem, snapshot your store, build a bigger instance, 
> move your elastic IP, and retire your old one.
> 
> As long as you have the ability to grow, just worry about getting something 
> that gets you in the game.
> 
> Kevin
> 
>> On Sep 8, 2015 2:06 PM, "Keith Smith"  wrote:
>> 
>> Hi,
>> 
>> I am wondering what your opinion is on cores and RAM when using a VPS.
>> 
>> I am thinking about this in the context of Drupal and Magento, both of who 
>> are resource hogs.
>> 
>> I was told more RAM is much more valuable on a VPS than is the number of 
>> cores.
>> 
>> I'm assuming 4G of RAM is enough to not go into swap.  I'm thinking this 
>> should be fine for a production site with moderate traffic running either 
>> Drupal or Magento.
>> 
>> As you know more cores means more money when it comes to VPS servers, while 
>> RAM is cheap.
>> 
>> Of course we know opcode cache, varnish, and memcache(d) can work wonders in 
>> speeding up websites. For this discussion lets assume we are using none of 
>> them.
>> 
>> The question is, will a second core make all that much difference if enough 
>> RAM is present to not use swap?  How would I know I need a second core - 
>> look at the load?
>> 
>> And is there other consideration or things I should be looking at?
>> 
>> Thank you very much for all your feedback!!
>> 
>> Keith
>> 
>> 
>> ---
>> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org
>> To subscribe, unsubscribe, or to change your mail settings:
>> http://lists.phxlinux.org/mailman/listinfo/plug-discuss
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Re: VPS 1 core vs 2 cores

[Kevin Fries]

1 core, 2 cores, 2GB RAM, 4GB RAM, the question is only relevant if you
have no expandability.  Select your software, take its recommendation, and
probably a little more, then make sure you can grow as needed.

Here is an example.

Let's say you go to AWS, get a server that is large enough to handle
Magento.  Your up, and in business.  Now, business is good.  Get another
instance and split off your database.  Business continues to grow, and you
need a bigger Megento instance.  No problem, snapshot your store, build a
bigger instance, move your elastic IP, and retire your old one.

As long as you have the ability to grow, just worry about getting something
that gets you in the game.

Kevin
On Sep 8, 2015 2:06 PM, "Keith Smith"  wrote:

>
> Hi,
>
> I am wondering what your opinion is on cores and RAM when using a VPS.
>
> I am thinking about this in the context of Drupal and Magento, both of who
> are resource hogs.
>
> I was told more RAM is much more valuable on a VPS than is the number of
> cores.
>
> I'm assuming 4G of RAM is enough to not go into swap.  I'm thinking this
> should be fine for a production site with moderate traffic running either
> Drupal or Magento.
>
> As you know more cores means more money when it comes to VPS servers,
> while RAM is cheap.
>
> Of course we know opcode cache, varnish, and memcache(d) can work wonders
> in speeding up websites. For this discussion lets assume we are using none
> of them.
>
> The question is, will a second core make all that much difference if
> enough RAM is present to not use swap?  How would I know I need a second
> core - look at the load?
>
> And is there other consideration or things I should be looking at?
>
> Thank you very much for all your feedback!!
>
> Keith
>
>
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> To subscribe, unsubscribe, or to change your mail settings:
> http://lists.phxlinux.org/mailman/listinfo/plug-discuss
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Re: VPS 1 core vs 2 cores

[Stephen Partington]

I almost always create 2 cores for most minimum configurations when
available in any virtual environment. but in the case of a VPS it really
matters how well your stack handles multi-threading and if you expect to
have enough load to saturate a core.

On Tue, Sep 8, 2015 at 1:01 PM, Keith Smith 
wrote:

>
> Hi,
>
> I am wondering what your opinion is on cores and RAM when using a VPS.
>
> I am thinking about this in the context of Drupal and Magento, both of who
> are resource hogs.
>
> I was told more RAM is much more valuable on a VPS than is the number of
> cores.
>
> I'm assuming 4G of RAM is enough to not go into swap.  I'm thinking this
> should be fine for a production site with moderate traffic running either
> Drupal or Magento.
>
> As you know more cores means more money when it comes to VPS servers,
> while RAM is cheap.
>
> Of course we know opcode cache, varnish, and memcache(d) can work wonders
> in speeding up websites. For this discussion lets assume we are using none
> of them.
>
> The question is, will a second core make all that much difference if
> enough RAM is present to not use swap?  How would I know I need a second
> core - look at the load?
>
> And is there other consideration or things I should be looking at?
>
> Thank you very much for all your feedback!!
>
> Keith
>
>
> ---
> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org
> To subscribe, unsubscribe, or to change your mail settings:
> http://lists.phxlinux.org/mailman/listinfo/plug-discuss
>



-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen
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Re: VPS 1 core vs 2 cores

[Nathan England]

I don't know that I would want to run a production site with Magento and 
Drupal with less than 4gb of ram. The cores = more visitors concurrently 
to your website. Unless very well designed, mysql/mariadb threads will 
only use a single core per query, so one user on the site could 
potentially stall the site with a huge query. Having multiple cores 
means multiple queries.


Naturally it is more complicated than that, but I figure with the 
generalities you are asking about, that about fits the bill.




On 2015-09-08 13:01, Keith Smith wrote:

Hi,

I am wondering what your opinion is on cores and RAM when using a VPS.

I am thinking about this in the context of Drupal and Magento, both of
who are resource hogs.

I was told more RAM is much more valuable on a VPS than is the number 
of cores.


I'm assuming 4G of RAM is enough to not go into swap.  I'm thinking
this should be fine for a production site with moderate traffic
running either Drupal or Magento.

As you know more cores means more money when it comes to VPS servers,
while RAM is cheap.

Of course we know opcode cache, varnish, and memcache(d) can work
wonders in speeding up websites. For this discussion lets assume we
are using none of them.

The question is, will a second core make all that much difference if
enough RAM is present to not use swap?  How would I know I need a
second core - look at the load?

And is there other consideration or things I should be looking at?

Thank you very much for all your feedback!!

Keith


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--
Nathan England (480) 559 - 9681
nengl...@nmecs.com
http://www.nmecs.com/
Web Developer, PHP Programmer, Lamp Administration, and
Information Security Specialist



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VPS 1 core vs 2 cores

[Keith Smith]

Hi,

I am wondering what your opinion is on cores and RAM when using a VPS.

I am thinking about this in the context of Drupal and Magento, both of 
who are resource hogs.


I was told more RAM is much more valuable on a VPS than is the number of 
cores.


I'm assuming 4G of RAM is enough to not go into swap.  I'm thinking this 
should be fine for a production site with moderate traffic running 
either Drupal or Magento.


As you know more cores means more money when it comes to VPS servers, 
while RAM is cheap.


Of course we know opcode cache, varnish, and memcache(d) can work 
wonders in speeding up websites. For this discussion lets assume we are 
using none of them.


The question is, will a second core make all that much difference if 
enough RAM is present to not use swap?  How would I know I need a second 
core - look at the load?


And is there other consideration or things I should be looking at?

Thank you very much for all your feedback!!

Keith


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