# Monitor GC duration/count **URL:** \ **Category:** Elasticsearch\ **Created:** [April 10, 2019, 9:32am UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183 "2019-04-10T09:32:12Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Beuhlet\_Reseau](https://avatars.discourse-cdn.com/v4/letter/b/e95f7d/32.png) [@Beuhlet\_Reseau](https://discuss.elastic.co/u/Beuhlet_Reseau)\ **Post date:** [April 10, 2019, 9:32am UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/1 "2019-04-10T09:32:12Z")
Hello, I want know how many GC are executed in last 5 min how long duration's GC is ? I want use : GET /\_nodes/elasticsearch\_instance1/stats/jvm : Output return : ``` "jvm": { "timestamp": 1554888379405, "uptime_in_millis": 56643256, "mem": { "heap_used_in_bytes": 16247615560, "heap_used_percent": 50, "heap_committed_in_bytes": 32212254720, "heap_max_in_bytes": 32212254720, "non_heap_used_in_bytes": 115543704, "non_heap_committed_in_bytes": 122445824, "pools": { "young": { "used_in_bytes": 14663286784, "max_in_bytes": 0, "peak_used_in_bytes": 18001952768, "peak_max_in_bytes": 0 }, "survivor": { "used_in_bytes": 109051904, "max_in_bytes": 0, "peak_used_in_bytes": 385875968, "peak_max_in_bytes": 0 }, "old": { "used_in_bytes": 1475276872, "max_in_bytes": 32212254720, "peak_used_in_bytes": 1475276872, "peak_max_in_bytes": 32212254720 } } }, "gc": { "collectors": { "young": { "collection_count": 22, "collection_time_in_millis": 1462 }, "old": { "collection_count": 0, "collection_time_in_millis": 0 } } }, indent preformatted text by 4 spaces ``` So, i don't understand return values ? My final aim is to put value is a text file to create graph about it : exemple : ``` date_every_5min ; instances es ; nbre gc ; average duration gc 100419_11_30 ; elasticsearch_instance1; 10 ; 100ms 100419_11_30 ; elasticsearch_instance2; 5 ; 60ms 100419_11_35 ; elasticsearch_instance3; 7 ; 70ms 100419_11_35 ; elasticsearch_instance1; 7 ; 35ms 100419_11_35 ; elasticsearch_instance2; 3 ; 86ms ... ``` Is possible ? ---
**Author:** ![Beuhlet\_Reseau](https://avatars.discourse-cdn.com/v4/letter/b/e95f7d/32.png) [@Beuhlet\_Reseau](https://discuss.elastic.co/u/Beuhlet_Reseau)\ **Post date:** [April 10, 2019, 9:36am UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/2 "2019-04-10T09:36:11Z")
> [@Beuhlet\_Reseau](#): > > "gc": { "collectors": { "young": { "collection\_count": 22, "collection\_time\_in\_millis": 1462 }, "old": { "collection\_count": 0, "collection\_time\_in\_millis": 0 } For example, what represente value in count ? For the current day ? Last XX minutes ? Same on : ```auto "collection_time_in_millis": 1462 ``` This is the duration of GC young, but it is duration for the current day ? (so i must divise this value by the number of hour in the day ?) ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [April 10, 2019, 10:13am UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/3 "2019-04-10T10:13:02Z")
The GC statistics you list are all cumulative, increasing from zero since the node was started. If you want to measure statistics over a time period then you should measure the values at the start and end of the time period and subtract them. ---
**Author:** ![Beuhlet\_Reseau](https://avatars.discourse-cdn.com/v4/letter/b/e95f7d/32.png) [@Beuhlet\_Reseau](https://discuss.elastic.co/u/Beuhlet_Reseau)\ **Post date:** [April 10, 2019, 10:22am UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/4 "2019-04-10T10:22:59Z")
Waw it's not intuitive. My node started 08/04/2019 at 8.00 am. =\> Currently its have 22 count and 1462 ms of duration If i follow you, average day : 11,5 count et 731 ms of duration (so 65 ms by gc) It's possible to use monitor metrics to create this type of visualization on Kibana ? ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [April 10, 2019, 10:36am UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/5 "2019-04-10T10:36:37Z")
> [@Beuhlet\_Reseau](#): > > Waw it's not intuitive. Reporting cumulative statistics like this is pretty common, see e.g. [/proc/diskstats](https://www.infradead.org/~mchehab/kernel_docs/unsorted/iostats.html), [/proc/net/dev](http://man7.org/linux/man-pages/man5/proc.5.html), [Postgres statistics](https://www.postgresql.org/docs/10/monitoring-stats.html) and many more. It would be much less intuitive (and much more computationally expensive) for these numbers to represent events within some arbitrary time window. > [@Beuhlet\_Reseau](#): > > It's possible to use monitor metrics to create this type of visualization on Kibana ? Yes, see [https://www.elastic.co/guide/en/kibana/master/timelion-math.html](https://www.elastic.co/guide/en/kibana/master/timelion-math.html) for an example. ---
**Author:** ![Beuhlet\_Reseau](https://avatars.discourse-cdn.com/v4/letter/b/e95f7d/32.png) [@Beuhlet\_Reseau](https://discuss.elastic.co/u/Beuhlet_Reseau)\ **Post date:** [April 10, 2019, 12:44pm UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/6 "2019-04-10T12:44:20Z")
I use free X-Pack (on 5). In, Nodes, Advanced, i can see 2 graph very interesting : GC Count and GC Duration on nodes. How to reproduce the same with curl API from shell. I want that, because free X-Pack have 7 days of retention. I want store more days, so i must use log file in Linux. ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [April 10, 2019, 12:48pm UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/7 "2019-04-10T12:48:06Z")
> [@Beuhlet\_Reseau](#): > > I want that, because free X-Pack have 7 days of retention. I want store more days, so i must use log file in Linux. 7 days is the default for [`xpack.monitoring.history.duration`](https://www.elastic.co/guide/en/elasticsearch/reference/5.6/monitoring-settings.html#monitoring-collection-settings) but if you want to retain more data then you can increase this setting. The basic X-pack licence doesn't limit the amount of data you can retain as far as I can tell. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [May 8, 2019, 12:48pm UTC](https://discuss.elastic.co/t/monitor-gc-duration-count/176183/8 "2019-05-08T12:48:13Z")
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