# Benchmarks (again)
**URL:** https://discuss.elastic.co/t/benchmarks-again/16576
**Category:** Elasticsearch
**Created:** [March 25, 2014, 5:11am UTC](https://discuss.elastic.co/t/benchmarks-again/16576 "2014-03-25T05:11:38Z")
**Posts on this page:** 12
**Page:** 1
### Author:  [@Robin\_Clarke](https://discuss.elastic.co/u/Robin_Clarke)
#### Post date: [March 25, 2014, 5:11am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/1 "2014-03-25T05:11:38Z")
I did some intensive tests last week on a 20-node cluster and had the
following insights - I'd be interested if anyone has similar/dissimilar
experience.
The had 20 nodes had 8 cores each, and 32GB memory each. I set up
Elasticsearch to have 15GB of that memory.
The sample events I was using were Apache logs (common format) without any
additional fields (no geoip, useragent etc. plugins).
When running as a 20-node cluster, I got a maximum igestion rate of 2500k
events/minute (41k/second), _but_ the bottleneck was the logstash CPU
load... so I reduced to a 10 node cluster...
With the 10 nodes I initially had 1600k/minute (27k) and acheived
1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
index\_buffer\_size to 20%
Further reducing to 5 nodes, I had 1100k/minute (18k/second).
This brings me to an interesting comparison: at 10 nodes, I have 3k
events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
the overhead for doubling the number of nodes from 5 to 10 is about 20%.
Is this to be expected? Just how scalable is Elasticsearch - at what point
is the diminishing return on adding nodes not cost effective?
Is the further logical reduction to 375 events/core/second still meaningful?
Cheers,
-Robin-
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [March 25, 2014, 5:17am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/2 "2014-03-25T05:17:10Z")
Can you elaborate what your cluster setup is like?
Node specs (disk, RAM, CPU), how many master/data nodes and what version of
ES and java you're running?
Regards,
Mark Walkom
Infrastructure Engineer
Campaign Monitor
email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
On 25 March 2014 16:11, Robin Clarke [robin13@gmail.com](mailto:robin13@gmail.com) wrote:
> I did some intensive tests last week on a 20-node cluster and had the
> following insights - I'd be interested if anyone has similar/dissimilar
> experience.
> The had 20 nodes had 8 cores each, and 32GB memory each. I set up
> Elasticsearch to have 15GB of that memory.
> The sample events I was using were Apache logs (common format) without any
> additional fields (no geoip, useragent etc. plugins).
> When running as a 20-node cluster, I got a maximum igestion rate of 2500k
> events/minute (41k/second), _but_ the bottleneck was the logstash CPU
> load... so I reduced to a 10 node cluster...
> With the 10 nodes I initially had 1600k/minute (27k) and acheived
> 1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
> index\_buffer\_size to 20%
> Further reducing to 5 nodes, I had 1100k/minute (18k/second).
> This brings me to an interesting comparison: at 10 nodes, I have 3k
> events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
> the overhead for doubling the number of nodes from 5 to 10 is about 20%.
> Is this to be expected? Just how scalable is Elasticsearch - at what
> point is the diminishing return on adding nodes not cost effective?
> Is the further logical reduction to 375 events/core/second still
> meaningful?
>
> Cheers,
> -Robin-
>
> --
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> .
> For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
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### Author:  [@Robin\_Clarke\_2](https://discuss.elastic.co/u/Robin_Clarke_2)
#### Post date: [March 25, 2014, 6:35am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/3 "2014-03-25T06:35:38Z")
Each node had 8 cores (2.4GHz Xeon), 32GB RAM, SSD disks (I never saw
IOWait, but was also focusing on ingestion rate).
I always had 2 master nodes, and in addition tried the configurations 20,
10 and 5 data nodes.
Running Elasticsearch 1.0.1 (but with Logstash 1.3.3)
-Robin-
On 25 March 2014 06:17, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> Can you elaborate what your cluster setup is like?
>
> Node specs (disk, RAM, CPU), how many master/data nodes and what version
> of ES and java you're running?
>
> Regards,
> Mark Walkom
>
> Infrastructure Engineer
> Campaign Monitor
> email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
>
> On 25 March 2014 16:11, Robin Clarke [robin13@gmail.com](mailto:robin13@gmail.com) wrote:
>
> > I did some intensive tests last week on a 20-node cluster and had the
> > following insights - I'd be interested if anyone has similar/dissimilar
> > experience.
> > The had 20 nodes had 8 cores each, and 32GB memory each. I set up
> > Elasticsearch to have 15GB of that memory.
> > The sample events I was using were Apache logs (common format) without
> > any additional fields (no geoip, useragent etc. plugins).
> > When running as a 20-node cluster, I got a maximum igestion rate of 2500k
> > events/minute (41k/second), _but_ the bottleneck was the logstash CPU
> > load... so I reduced to a 10 node cluster...
> > With the 10 nodes I initially had 1600k/minute (27k) and acheived
> > 1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
> > index\_buffer\_size to 20%
> > Further reducing to 5 nodes, I had 1100k/minute (18k/second).
> > This brings me to an interesting comparison: at 10 nodes, I have 3k
> > events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
> > the overhead for doubling the number of nodes from 5 to 10 is about 20%.
> > Is this to be expected? Just how scalable is Elasticsearch - at what
> > point is the diminishing return on adding nodes not cost effective?
> > Is the further logical reduction to 375 events/core/second still
> > meaningful?
> >
> > Cheers,
> > -Robin-
> >
> > --
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> > "elasticsearch" group.
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> >
> > To view this discussion on the web visit
> > [https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm_medium=email&utm_source=footer)
> > .
> > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
>
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> .
>
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--
Best winds,
-Robin-
~:)
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [March 25, 2014, 6:55am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/4 "2014-03-25T06:55:28Z")
Java version? Also what OS?
Just as a general note, it's always good to have an uneven number of
masters to ensure you get a majority quorum.
Regards,
Mark Walkom
Infrastructure Engineer
Campaign Monitor
email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
On 25 March 2014 17:35, Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net) wrote:
> Each node had 8 cores (2.4GHz Xeon), 32GB RAM, SSD disks (I never saw
> IOWait, but was also focusing on ingestion rate).
> I always had 2 master nodes, and in addition tried the configurations 20,
> 10 and 5 data nodes.
> Running Elasticsearch 1.0.1 (but with Logstash 1.3.3)
>
> -Robin-
>
> On 25 March 2014 06:17, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
>
> > Can you elaborate what your cluster setup is like?
> >
> > Node specs (disk, RAM, CPU), how many master/data nodes and what version
> > of ES and java you're running?
> >
> > Regards,
> > Mark Walkom
> >
> > Infrastructure Engineer
> > Campaign Monitor
> > email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> > web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
> >
> > On 25 March 2014 16:11, Robin Clarke [robin13@gmail.com](mailto:robin13@gmail.com) wrote:
> >
> > > I did some intensive tests last week on a 20-node cluster and had the
> > > following insights - I'd be interested if anyone has similar/dissimilar
> > > experience.
> > > The had 20 nodes had 8 cores each, and 32GB memory each. I set up
> > > Elasticsearch to have 15GB of that memory.
> > > The sample events I was using were Apache logs (common format) without
> > > any additional fields (no geoip, useragent etc. plugins).
> > > When running as a 20-node cluster, I got a maximum igestion rate of
> > > 2500k events/minute (41k/second), _but_ the bottleneck was the logstash
> > > CPU load... so I reduced to a 10 node cluster...
> > > With the 10 nodes I initially had 1600k/minute (27k) and acheived
> > > 1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
> > > index\_buffer\_size to 20%
> > > Further reducing to 5 nodes, I had 1100k/minute (18k/second).
> > > This brings me to an interesting comparison: at 10 nodes, I have 3k
> > > events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
> > > the overhead for doubling the number of nodes from 5 to 10 is about 20%.
> > > Is this to be expected? Just how scalable is Elasticsearch - at what
> > > point is the diminishing return on adding nodes not cost effective?
> > > Is the further logical reduction to 375 events/core/second still
> > > meaningful?
> > >
> > > Cheers,
> > > -Robin-
> > >
> > > --
> > > You received this message because you are subscribed to the Google
> > > Groups "elasticsearch" group.
> > > To unsubscribe from this group and stop receiving emails from it, send
> > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com).
> > >
> > > To view this discussion on the web visit
> > > [https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm_medium=email&utm_source=footer)
> > > .
> > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
> >
> > --
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> > .
> >
> > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
>
> --
> Best winds,
> -Robin-
> ~:)
>
> --
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> .
> For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
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### Author:  [@Robin\_Clarke\_2](https://discuss.elastic.co/u/Robin_Clarke_2)
#### Post date: [March 25, 2014, 7:20am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/5 "2014-03-25T07:20:24Z")
Thanks for the tip with the number of masters!
java version "1.6.0\_45" on Debian 3.2.54-2
On 25 March 2014 07:55, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> Java version? Also what OS?
>
> Just as a general note, it's always good to have an uneven number of
> masters to ensure you get a majority quorum.
>
> Regards,
> Mark Walkom
>
> Infrastructure Engineer
> Campaign Monitor
> email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
>
> On 25 March 2014 17:35, Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net) wrote:
>
> > Each node had 8 cores (2.4GHz Xeon), 32GB RAM, SSD disks (I never saw
> > IOWait, but was also focusing on ingestion rate).
> > I always had 2 master nodes, and in addition tried the configurations 20,
> > 10 and 5 data nodes.
> > Running Elasticsearch 1.0.1 (but with Logstash 1.3.3)
> >
> > -Robin-
> >
> > On 25 March 2014 06:17, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> >
> > > Can you elaborate what your cluster setup is like?
> > >
> > > Node specs (disk, RAM, CPU), how many master/data nodes and what version
> > > of ES and java you're running?
> > >
> > > Regards,
> > > Mark Walkom
> > >
> > > Infrastructure Engineer
> > > Campaign Monitor
> > > email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> > > web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
> > >
> > > On 25 March 2014 16:11, Robin Clarke [robin13@gmail.com](mailto:robin13@gmail.com) wrote:
> > >
> > > > I did some intensive tests last week on a 20-node cluster and had the
> > > > following insights - I'd be interested if anyone has similar/dissimilar
> > > > experience.
> > > > The had 20 nodes had 8 cores each, and 32GB memory each. I set up
> > > > Elasticsearch to have 15GB of that memory.
> > > > The sample events I was using were Apache logs (common format) without
> > > > any additional fields (no geoip, useragent etc. plugins).
> > > > When running as a 20-node cluster, I got a maximum igestion rate of
> > > > 2500k events/minute (41k/second), _but_ the bottleneck was the
> > > > logstash CPU load... so I reduced to a 10 node cluster...
> > > > With the 10 nodes I initially had 1600k/minute (27k) and acheived
> > > > 1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
> > > > index\_buffer\_size to 20%
> > > > Further reducing to 5 nodes, I had 1100k/minute (18k/second).
> > > > This brings me to an interesting comparison: at 10 nodes, I have 3k
> > > > events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
> > > > the overhead for doubling the number of nodes from 5 to 10 is about 20%.
> > > > Is this to be expected? Just how scalable is Elasticsearch - at what
> > > > point is the diminishing return on adding nodes not cost effective?
> > > > Is the further logical reduction to 375 events/core/second still
> > > > meaningful?
> > > >
> > > > Cheers,
> > > > -Robin-
> > > >
> > > > --
> > > > You received this message because you are subscribed to the Google
> > > > Groups "elasticsearch" group.
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> > > > an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com).
> > > >
> > > > To view this discussion on the web visit
> > > > [https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm_medium=email&utm_source=footer)
> > > > .
> > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
> > >
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> > > .
> > >
> > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
> >
> > --
> > Best winds,
> > -Robin-
> > ~:)
> >
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-Robin-
~:)
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [March 25, 2014, 7:41am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/6 "2014-03-25T07:41:55Z")
Ouch, why such an old version of java? (And is is Open or Oracle?)
v7 is the minimum for ES and LS.
Regards,
Mark Walkom
Infrastructure Engineer
Campaign Monitor
email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
On 25 March 2014 18:20, Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net) wrote:
> Thanks for the tip with the number of masters!
>
> java version "1.6.0\_45" on Debian 3.2.54-2
>
> On 25 March 2014 07:55, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
>
> > Java version? Also what OS?
> >
> > Just as a general note, it's always good to have an uneven number of
> > masters to ensure you get a majority quorum.
> >
> > Regards,
> > Mark Walkom
> >
> > Infrastructure Engineer
> > Campaign Monitor
> > email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> > web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
> >
> > On 25 March 2014 17:35, Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net) wrote:
> >
> > > Each node had 8 cores (2.4GHz Xeon), 32GB RAM, SSD disks (I never saw
> > > IOWait, but was also focusing on ingestion rate).
> > > I always had 2 master nodes, and in addition tried the configurations
> > > 20, 10 and 5 data nodes.
> > > Running Elasticsearch 1.0.1 (but with Logstash 1.3.3)
> > >
> > > -Robin-
> > >
> > > On 25 March 2014 06:17, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> > >
> > > > Can you elaborate what your cluster setup is like?
> > > >
> > > > Node specs (disk, RAM, CPU), how many master/data nodes and what
> > > > version of ES and java you're running?
> > > >
> > > > Regards,
> > > > Mark Walkom
> > > >
> > > > Infrastructure Engineer
> > > > Campaign Monitor
> > > > email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> > > > web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
> > > >
> > > > On 25 March 2014 16:11, Robin Clarke [robin13@gmail.com](mailto:robin13@gmail.com) wrote:
> > > >
> > > > > I did some intensive tests last week on a 20-node cluster and had
> > > > > the following insights - I'd be interested if anyone has similar/dissimilar
> > > > > experience.
> > > > > The had 20 nodes had 8 cores each, and 32GB memory each. I set up
> > > > > Elasticsearch to have 15GB of that memory.
> > > > > The sample events I was using were Apache logs (common format) without
> > > > > any additional fields (no geoip, useragent etc. plugins).
> > > > > When running as a 20-node cluster, I got a maximum igestion rate of
> > > > > 2500k events/minute (41k/second), _but_ the bottleneck was the
> > > > > logstash CPU load... so I reduced to a 10 node cluster...
> > > > > With the 10 nodes I initially had 1600k/minute (27k) and acheived
> > > > > 1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
> > > > > index\_buffer\_size to 20%
> > > > > Further reducing to 5 nodes, I had 1100k/minute (18k/second).
> > > > > This brings me to an interesting comparison: at 10 nodes, I have 3k
> > > > > events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
> > > > > the overhead for doubling the number of nodes from 5 to 10 is about 20%.
> > > > > Is this to be expected? Just how scalable is Elasticsearch - at what
> > > > > point is the diminishing return on adding nodes not cost effective?
> > > > > Is the further logical reduction to 375 events/core/second still
> > > > > meaningful?
> > > > >
> > > > > Cheers,
> > > > > -Robin-
> > > > >
> > > > > --
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> > > > > .
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> > > > .
> > > >
> > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
> > >
> > > --
> > > Best winds,
> > > -Robin-
> > > ~:)
> > >
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> > .
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> --
> Best winds,
> -Robin-
> ~:)
>
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### Author:  [@Robin\_Clarke\_2](https://discuss.elastic.co/u/Robin_Clarke_2)
#### Post date: [March 25, 2014, 8:05am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/7 "2014-03-25T08:05:54Z")
Sorry, correction, we were running ES and LS with java version "1.7.0\_51",
I just looked up the default on that system, which (someone says) is
required for some other applications... but yes, we were using the correct
Java version! 🙂
-Robin-
On 25 March 2014 08:41, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> Ouch, why such an old version of java? (And is is Open or Oracle?)
> v7 is the minimum for ES and LS.
>
> Regards,
> Mark Walkom
>
> Infrastructure Engineer
> Campaign Monitor
> email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
>
> On 25 March 2014 18:20, Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net) wrote:
>
> > Thanks for the tip with the number of masters!
> >
> > java version "1.6.0\_45" on Debian 3.2.54-2
> >
> > On 25 March 2014 07:55, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> >
> > > Java version? Also what OS?
> > >
> > > Just as a general note, it's always good to have an uneven number of
> > > masters to ensure you get a majority quorum.
> > >
> > > Regards,
> > > Mark Walkom
> > >
> > > Infrastructure Engineer
> > > Campaign Monitor
> > > email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> > > web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
> > >
> > > On 25 March 2014 17:35, Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net) wrote:
> > >
> > > > Each node had 8 cores (2.4GHz Xeon), 32GB RAM, SSD disks (I never saw
> > > > IOWait, but was also focusing on ingestion rate).
> > > > I always had 2 master nodes, and in addition tried the configurations
> > > > 20, 10 and 5 data nodes.
> > > > Running Elasticsearch 1.0.1 (but with Logstash 1.3.3)
> > > >
> > > > -Robin-
> > > >
> > > > On 25 March 2014 06:17, Mark Walkom [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) wrote:
> > > >
> > > > > Can you elaborate what your cluster setup is like?
> > > > >
> > > > > Node specs (disk, RAM, CPU), how many master/data nodes and what
> > > > > version of ES and java you're running?
> > > > >
> > > > > Regards,
> > > > > Mark Walkom
> > > > >
> > > > > Infrastructure Engineer
> > > > > Campaign Monitor
> > > > > email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com)
> > > > > web: [www.campaignmonitor.com](http://www.campaignmonitor.com)
> > > > >
> > > > > On 25 March 2014 16:11, Robin Clarke [robin13@gmail.com](mailto:robin13@gmail.com) wrote:
> > > > >
> > > > > > I did some intensive tests last week on a 20-node cluster and had
> > > > > > the following insights - I'd be interested if anyone has similar/dissimilar
> > > > > > experience.
> > > > > > The had 20 nodes had 8 cores each, and 32GB memory each. I set up
> > > > > > Elasticsearch to have 15GB of that memory.
> > > > > > The sample events I was using were Apache logs (common format)
> > > > > > without any additional fields (no geoip, useragent etc. plugins).
> > > > > > When running as a 20-node cluster, I got a maximum igestion rate of
> > > > > > 2500k events/minute (41k/second), _but_ the bottleneck was the
> > > > > > logstash CPU load... so I reduced to a 10 node cluster...
> > > > > > With the 10 nodes I initially had 1600k/minute (27k) and acheived
> > > > > > 1800k/minute (30k/second) by increasing index\_refresh\_interval to 30s and
> > > > > > index\_buffer\_size to 20%
> > > > > > Further reducing to 5 nodes, I had 1100k/minute (18k/second).
> > > > > > This brings me to an interesting comparison: at 10 nodes, I have 3k
> > > > > > events/second/node, and with 5 nodes I have 3.66k events/second/node. i.e.
> > > > > > the overhead for doubling the number of nodes from 5 to 10 is about 20%.
> > > > > > Is this to be expected? Just how scalable is Elasticsearch - at what
> > > > > > point is the diminishing return on adding nodes not cost effective?
> > > > > > Is the further logical reduction to 375 events/core/second still
> > > > > > meaningful?
> > > > > >
> > > > > > Cheers,
> > > > > > -Robin-
> > > > > >
> > > > > > --
> > > > > > You received this message because you are subscribed to the Google
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> > > > > > send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com).
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> > > > > > [https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/3353dab5-6241-4b41-8845-6c5f8553d488%40googlegroups.com?utm_medium=email&utm_source=footer)
> > > > > > .
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> > > > >
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> > > > > .
> > > > >
> > > > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout).
> > > >
> > > > --
> > > > Best winds,
> > > > -Robin-
> > > > ~:)
> > > >
> > > > --
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> > > .
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> > -Robin-
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### Author:  [@Steinar\_Bang](https://discuss.elastic.co/u/Steinar_Bang)
#### Post date: [March 26, 2014, 11:17am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/8 "2014-03-26T11:17:52Z")
> > > > > Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net):
> Thanks for the tip with the number of masters!
> java version "1.6.0\_45" on Debian 3.2.54-2
Debian 3.2? Are you sure...?
[Debian GNU/Linux 3.0 “woody” Release Information](http://www.debian.org/releases/woody/)
[Debian -- Debian “sarge” Release Information](http://www.debian.org/releases/sarge/)
AFAIK there is no 3.2. Debian went from 3.1 "woody" to 4.0 "etch".
(I have a computer still running, that was installed as debian potato in
2001, taken to debian testing, and went to woody as the first stable
release in 2002. Both woody or sarge were fine releases in their time,
but I wouldn't pick either for a new high performance cluster...🙂 )
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### Author:  [@Robin\_Clarke\_2](https://discuss.elastic.co/u/Robin_Clarke_2)
#### Post date: [March 26, 2014, 11:25am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/9 "2014-03-26T11:25:31Z")
I just pasted output from uname there - that's kernel 3.2.54-2 you're
reading there.
I think the Debian release is Wheezy (7.0)
-Robin-
On 26 March 2014 12:17, Steinar Bang [sb@dod.no](mailto:sb@dod.no) wrote:
> > > > > > Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net):
>
> > Thanks for the tip with the number of masters!
> > java version "1.6.0\_45" on Debian 3.2.54-2
>
> Debian 3.2? Are you sure...?
> [Debian GNU/Linux 3.0 “woody” Release Information](http://www.debian.org/releases/woody/)
> [Debian -- Debian “sarge” Release Information](http://www.debian.org/releases/sarge/)
>
> AFAIK there is no 3.2. Debian went from 3.1 "woody" to 4.0 "etch".
>
> (I have a computer still running, that was installed as debian potato in
> 2001, taken to debian testing, and went to woody as the first stable
> release in 2002. Both woody or sarge were fine releases in their time,
> but I wouldn't pick either for a new high performance cluster...🙂 )
>
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### Author:  [@Steinar\_Bang](https://discuss.elastic.co/u/Steinar_Bang)
#### Post date: [March 26, 2014, 11:43am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/10 "2014-03-26T11:43:59Z")
> > > > > Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net):
> I just pasted output from uname there - that's kernel 3.2.54-2 you're
> reading there.
> I think the Debian release is Wheezy (7.0)
OK. The OS version can be found in the /etc/debian\_version file.
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### Author:  [@Robin\_Clarke\_2](https://discuss.elastic.co/u/Robin_Clarke_2)
#### Post date: [March 26, 2014, 11:51am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/11 "2014-03-26T11:51:42Z")
In that case, _7.4_
-Robin-
On 26 March 2014 12:43, Steinar Bang [sb@dod.no](mailto:sb@dod.no) wrote:
> > > > > > Robin Clarke [robin@robinclarke.net](mailto:robin@robinclarke.net):
>
> > I just pasted output from uname there - that's kernel 3.2.54-2 you're
> > reading there.
> > I think the Debian release is Wheezy (7.0)
>
> OK. The OS version can be found in the /etc/debian\_version file.
>
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:40am UTC](https://discuss.elastic.co/t/benchmarks-again/16576/12 "2017-07-06T01:40:39Z")