To clarify, I mean the number of Solr cores per JVM instance. How many Solr
cores on one node is too many?
As mentioned, it would be nice to get the numbers for a Solr instance
running in standalone mode (aka non-SolrCloud), but if not, would also be
interested to know about people's experience with SolrCloud in this regard.

Thanks,
Rahul


On Fri, Nov 12, 2021 at 2:29 PM Tulsi Das <tulsi.das1...@gmail.com> wrote:

> Hi Rahul ,
> Are you asking about the cores (number of replica's per node) or the cpu
> cores?
>
> On Sat, Nov 13, 2021, 12:50 AM Walter Underwood <wun...@wunderwood.org>
> wrote:
>
> > We’ve run on AWS instances with 72 CPUs. They all get used. Throughput is
> > linear with the number of CPUs. You need enough free RAM to cache all of
> > the index files in OS file buffers.
> >
> > The entire point of avoiding locking in the Lucene index is so that
> > multiple threads can read it without contention. We made the same
> decision
> > in the Ultraseek index design 25 years ago.
> >
> > We don’t do any special JVM tuning. We use the config that Shawn Heisey
> > recommended five years ago. We reacently increased the heap from 8 GB to
> 16
> > GB.
> >
> > GC_TUNE=" \
> > -XX:+UseG1GC \
> > -XX:+ParallelRefProcEnabled \
> > -XX:G1HeapRegionSize=8m \
> > -XX:MaxGCPauseMillis=200 \
> > -XX:+UseLargePages \
> > -XX:+AggressiveOpts \
> > "
> >
> > wunder
> > Walter Underwood
> > wun...@wunderwood.org
> > http://observer.wunderwood.org/  (my blog)
> >
> > > On Nov 12, 2021, at 7:41 AM, Deepak Goel <deic...@gmail.com> wrote:
> > >
> > > My guess is (please note it is not a benchmark): you would need a lot
> of
> > > tuning to make Solr use 32 cpu cores per node. After 4 cpu cores, you
> > would
> > > have to start tuning Solr, JVM, your app (requirement), IOP'S.
> > >
> > > Deepak
> > > "The greatness of a nation can be judged by the way its animals are
> > treated
> > > - Mahatma Gandhi"
> > >
> > > +91 73500 12833
> > > deic...@gmail.com
> > >
> > > Facebook: https://www.facebook.com/deicool
> > > LinkedIn: www.linkedin.com/in/deicool
> > >
> > > "Plant a Tree, Go Green"
> > >
> > > Make In India : http://www.makeinindia.com/home
> > >
> > >
> > > On Fri, Nov 12, 2021 at 8:33 PM Rahul Goswami <rahul196...@gmail.com>
> > wrote:
> > >
> > >> Hi,
> > >> Does anyone have benchmarks on performance as the number of cores on a
> > Solr
> > >> node goes up? I am trying to get an idea about how many cores per node
> > is
> > >> too much. Assume 31 GB heap size, SSD disk and 32 CPU cores.
> > >> Preferably non-SolrCloud (aka standalone), but even if you have
> insights
> > >> from SolrCloud that would be a good start.
> > >> I am using Solr 7.7.2.
> > >>
> > >> Thanks,
> > >> Rahul
> > >>
> >
> >
>

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