Re: Instance becomes unresponsive after 12 hours
Re: Instance becomes unresponsive after 12 hours
- Subject: Re: Instance becomes unresponsive after 12 hours
- From: Bogdan Zlatanov <email@hidden>
- Date: Sun, 24 Jan 2016 21:01:37 +0100
Hi again,
Try redirecting all the GC output in it's own file with the
-Xloggc: /path/to/gc/log option.
Cheers,
Bogdan
On 24/01/2016 20:19, Maik Musall 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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