# Logstash throughput with metrics plugin

**URL:** https://discuss.elastic.co/t/logstash-throughput-with-metrics-plugin/41265
**Category:** Logstash
**Created:** [February 9, 2016, 10:40am UTC](https://discuss.elastic.co/t/logstash-throughput-with-metrics-plugin/41265 "2016-02-09T10:40:35Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Jordi\_Piriz](https://avatars.discourse-cdn.com/v4/letter/j/d26b3c/32.png) [@Jordi\_Piriz](https://discuss.elastic.co/u/Jordi_Piriz)
#### Post date: [February 9, 2016, 10:40am UTC](https://discuss.elastic.co/t/logstash-throughput-with-metrics-plugin/41265/1 "2016-02-09T10:40:35Z")

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Hi everybody,

I am trying to measure the logstash's throughput with the metrics plugin and I don't understand the results I obtained, can anyone help me?

My configuration:

forwarders (~6000 events/min) -\> Logstash/REDIS(Node02) -\> Logstash/Indexer(Node04) -\> ElasticSearch(Node06)

In the Logstash node that adds metrics to Redis I added a metrics output to see the input rate. In the indexer I did the same to see the output rate of the agent. I'm sending  
the metrics to graphite and I am observing that although when the input rate it's the same that output rate, the redis queue grows. When the queue Grows, the output rate is limited to 50 events/sec in the indexer.  
Could anyone explain what is happening or what I am doing wrong?

Thanks in advance

 ![](https://us1.discourse-cdn.com/elastic/original/2X/2/2e76c7270956158d019d9769e248f69d6c4bf982.png)

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<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 5:12am UTC](https://discuss.elastic.co/t/logstash-throughput-with-metrics-plugin/41265/2 "2017-07-06T05:12:31Z")

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