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From Deepak Goel <deic...@gmail.com>
Subject Re: Some performance questions....
Date Fri, 16 Mar 2018 13:26:59 GMT
>I think there is no benefit in having multiple Solr instances on a single
>server, unless the heap memory required by the JVM is too big.
****Deepak***
I would try multiple Solr instances rather a single Solr instance (it
definitely will give a performance boost)
****Deepak***
>And remember that this has relatively to do with the index size ( inverted
>index is memory mapped OFF heap and docValues as well).
>On the other hand of course Apache Solr uses plenty of JVM heap memory as
>well ( caches, temporary data structures during indexing, ect ect)

> Deepak:
>
> Well its kinda a given that when running ANYTHING under a VM you have an
> overhead..

>***Deepak***
>You mean you are assuming without any facts (performance benchmark with n
>without VM)
 >***Deepak***
>I think Shawn detailed this quite extensively, I am no sys admin or OS
>expert, but there is no need of benchmarks and I don't even understand your
>doubts.
>In Information technology anytime you add additional layers of software you
>need adapters which means additional instructions executed.
>It is obvious  that having :
>metal -> OS -> APP is cheaper instruction wise then
>metal -> OS -> VM -> APP
>The APP will execute instruction in the VM that will be responsible to
>translate those instructions for the underlining OS.
****Deepak***
I had past experience with VM's. They absolutely do not take any overheads.
Since we have conflicting opinions, it is best to benchmark it yourself
****Deepak***
>Going direct you skip one passage.
>you can think about this when you emulate different OS, is it cheaper to
run
>windows on a machine directly to execute windows applications or run a
>Windows VM on top of another OS to execute windows applications ?









Deepak
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On Thu, Mar 15, 2018 at 9:43 PM, Alessandro Benedetti <a.benedetti@sease.io>
wrote:

> *Single Solr Instance VS Multiple Solr instances on Single Server
> *
>
> I think there is no benefit in having multiple Solr instances on a single
> server, unless the heap memory required by the JVM is too big.
> And remember that this has relatively to do with the index size ( inverted
> index is memory mapped OFF heap and docValues as well).
> On the other hand of course Apache Solr uses plenty of JVM heap memory as
> well ( caches, temporary data structures during indexing, ect ect)
>
> > Deepak:
> >
> > Well its kinda a given that when running ANYTHING under a VM you have an
> > overhead..
>
> ***Deepak***
> You mean you are assuming without any facts (performance benchmark with n
> without VM)
>  ***Deepak***
> I think Shawn detailed this quite extensively, I am no sys admin or OS
> expert, but there is no need of benchmarks and I don't even understand your
> doubts.
> In Information technology anytime you add additional layers of software you
> need adapters which means additional instructions executed.
> It is obvious  that having :
> metal -> OS -> APP is cheaper instruction wise then
> metal -> OS -> VM -> APP
> The APP will execute instruction in the VM that will be responsible to
> translate those instructions for the underlining OS.
> Going direct you skip one passage.
> you can think about this when you emulate different OS, is it cheaper to
> run
> windows on a machine directly to execute windows applications or run a
> Windows VM on top of another OS to execute windows applications ?
>
>
>
> -----
> ---------------
> Alessandro Benedetti
> Search Consultant, R&D Software Engineer, Director
> Sease Ltd. - www.sease.io
> --
> Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
>

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