# Documentation about monitor.jvm.gc.overhead.\*

**URL:** <https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248>\
**Category:** Elasticsearch\
**Created:** [July 7, 2017, 9:55am UTC](https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248 "2017-07-07T09:55:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![gdrouet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/gdrouet/32/19849_2.png) [@gdrouet](https://discuss.elastic.co/u/gdrouet)\
**Post date:** [July 7, 2017, 9:55am UTC](https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248/1 "2017-07-07T09:55:11Z")

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Hi,

I did not find documentation about monitor.jvm.gc.overhead.\* settings.  
An integer is expected as value, but what is the time unit ?  
Moreover, it seems that monitor.jvm.gc.overhead has replaced both monitor.jvm.gc.old and monitor.jvm.gc.young settings but I did not also find confirmation about that.

Can you answer?

Thanks

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<div class="post-metadata">

**Author:** ![jimczi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jimczi/32/47985_2.png) [@jimczi](https://discuss.elastic.co/u/jimczi)\
**Post date:** [July 7, 2017, 12:50pm UTC](https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248/2 "2017-07-07T12:50:31Z")

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Hi,  
The time unit is in milliseconds and nothing has changed regarding `monitor.jvm.gc.old` and `monitor.jvm.gc.new` so you can still define them in your settings.

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<div class="post-metadata">

**Author:** ![gdrouet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/gdrouet/32/19849_2.png) [@gdrouet](https://discuss.elastic.co/u/gdrouet)\
**Post date:** [July 7, 2017, 12:54pm UTC](https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248/3 "2017-07-07T12:54:05Z")

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Thanks for the time unit.

However, other settings than overhead are rejected:  
java.lang.IllegalArgumentException: unknown setting [monitor.jvm.gc.old.debug] did you mean [monitor.jvm.gc.overhead.debug]?

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<div class="post-metadata">

**Author:** ![jimczi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jimczi/32/47985_2.png) [@jimczi](https://discuss.elastic.co/u/jimczi)\
**Post date:** [July 7, 2017, 1:04pm UTC](https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248/4 "2017-07-07T13:04:05Z")

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Yep sorry that's what I meant

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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:** [August 4, 2017, 1:04pm UTC](https://discuss.elastic.co/t/documentation-about-monitor-jvm-gc-overhead/92248/5 "2017-08-04T13:04:06Z")

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