# Optimize slow aggregation

**URL:** <https://discuss.elastic.co/t/optimize-slow-aggregation/78042>\
**Category:** Elasticsearch\
**Created:** [March 9, 2017, 7:24pm UTC](https://discuss.elastic.co/t/optimize-slow-aggregation/78042 "2017-03-09T19:24:42Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ebuildy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ebuildy/32/6070_2.png) [@ebuildy](https://discuss.elastic.co/u/ebuildy)\
**Post date:** [March 9, 2017, 7:24pm UTC](https://discuss.elastic.co/t/optimize-slow-aggregation/78042/1 "2017-03-09T19:24:42Z")

</div>

I am running an index with 800.000 documents, 500Mo total, with 30 fields, small strings.

Running some aggregations takes 150ms on my Docker4Mac machine (4Go, 4 CPU i7), but more than 400ms on server (8 Go, 2 CPU Xeon E5v3 but virtualized).

I tried different elasticsearch version, tried to mount data in tmpfs etc... but dont find the bottleneck 😕

Here my template:

```
PUT /_template/template_etl
{
   "template": "etl-*",
   "settings": {
      "index.mapping.ignore_malformed": true,
      "index.translog.flush_threshold_size": "1g",
      "index.translog.durability": "async",
      "number_of_replicas": "0",
      "number_of_shards": "3",
      "refresh_interval": "30s"
   },
   "mappings": {
      "_default_": {
         "dynamic_templates": [
            {
               "all_numeric": {
                  "match_mapping_type": "long",
                  "unmatch": "*_long",
                  "mapping": {
                     "type": "integer"
                  }
               }
            },
            {
               "all_string": {
                  "match": "*",
                  "match_mapping_type": "string",
                  "mapping": {
                     "type": "string",
                     "index": "not_analyzed",
                     "norms": {
                        "enabled": false
                     }
                  }
               }
            }
         ]
      }
   }
}

```

I try to understand a such difference, and what can I do to improve it (more CPU ? What tuning since I have only 500Mo, it should fit in page cache isnit?)

Here hot threads dump: [https://gist.github.com/ebuildy/b758341b89bcf50eff454d6fc8179e76](https://gist.github.com/ebuildy/b758341b89bcf50eff454d6fc8179e76)

Thanks you for some clues

---

<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:** [April 6, 2017, 7:24pm UTC](https://discuss.elastic.co/t/optimize-slow-aggregation/78042/2 "2017-04-06T19:24:46Z")

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