Re: Instance becomes unresponsive after 12 hours
Re: Instance becomes unresponsive after 12 hours
- Subject: Re: Instance becomes unresponsive after 12 hours
- From: Andrus Adamchik <email@hidden>
- Date: Mon, 25 Jan 2016 11:35:34 +0300
Here is my favorite:
jstat -gc <pid> 10000 3000
Attaches to a local Java process and prints all minor and major GC's. Usually more detailed than VisualVM.
Andrus
---------------
Andrus Adamchik
@andrus_a | @ApacheCayenne
> On Jan 24, 2016, at 10:19 PM, Maik Musall <email@hidden> wrote:
>
> Hi,
>
> yes, I tried, but the documented log output would never appear anywhere in my logs. These are the options I'm using:
>
> -verbose:gc
> -XX:+PrintGCDetails
> -XX:+PrintGCDateStamps
>
> Despite these settings, I can't see ANYTHING in the logs about GC. I don't know what I'm doing wrong there?
>
> Maik
>
>> Am 24.01.2016 um 13:27 schrieb Bogdan Zlatanov <email@hidden>:
>>
>> Hi,
>>
>> Have you tried tracing the garbage collection -> https://docs.oracle.com/cd/E19159-01/819-3681/abeig/index.html?
>>
>> Cheers,
>> Bogdan
>>
>>> On 24/01/2016 13:01, Musall Maik wrote:
>>> Hi,
>>>
>>> I have an application that often becomes laggy and shows slow responses almost every day around 5 pm. The instance has daily scheduled restarts at 5 am, so it occurs after 12 hours of use. When I restart it preemptively at 3 pm, the problem does not occur. When I don't, users suffer bad response times on many requests, but not all.
>>>
>>> Users are computing heavy statistics in this application, instance size (mostly snapshot cache) at that time is usually about 50 GByte, while Xmx is 84 GByte, and XX:MaxPermSize is 1024m. The biggest instance size I've seen so far in production is 61 GByte, so 50 seems not like a limit where something weird happens.
>>>
>>> CPU, memory, filesystem, database and network all show nothing special before and after 5 pm. I monitored the instance with jvisualvm to no avail. I've been searching for the reason for quite some time now, so I'd appreciate any suggestion you might have what else to check.
>>>
>>> Thanks
>>> Maik
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