Thank you for your prompt reply! Yes and no.
The blue line has a strong correlation to Garbage Collections but as you
can see that represents only a partial amount of CPU used and doesn't occur
for every spike. Every 3rd or 4th event has no garbage collection
associated. All of the garbage collection over the past hour or so has
occurred within the greater high CPU consumption.
Since there are 10 second long periods of high CPU usage with no garbage
collection, what could be causing those? The garbage collection was
something I also noticed but it looks like new threads keep getting
launched every 20 seconds when no one has requested that. If the thousands
of threads not been created I also presume there would be no need for
garbage collection now.
Have you looked at the "CPU Time" in the image? There is nothing that gets
attributed for causing the CPU to run (to my untrained eye) -- is this
indicative of a rogue process that just regularly calls `wait(10)`?
Thank you again; I'm happy to try and run or execute anything that might
give us more of an idea of what is launching these consumptive threads.
After reading the Etiquette file, I realized I should output the version
info:
E:\dspace\bin>dspace version
Using DSpace installation in: E:\dspace
DSpace version: 5.4-SNAPSHOT
SCM revision: ${buildNumber}
SCM branch: UNKNOWN_BRANCH
OS: Windows Server 2012 R2(amd64) version 6.3
Applications:
Discovery: enabled.
JRE: Oracle Corporation version 1.8.0_65
Ant version: Apache Ant(TM) version 1.9.4 compiled on April 29 2014
Maven version: 3.3.1
DSpace home: E:/dspace
On Tuesday, December 8, 2015 at 10:31:02 AM UTC-5, helix84 wrote:
>
> YourKit will also tell you when garbage collection occurred. Do the
> CPU activity times correspond to GC events? If they do, it's normal
> behaviour. GC in Java can be tuned to a high extent (but GC events
> will always occur).
>
>
> Regards,
> ~~helix84
>
> Compulsory reading: DSpace Mailing List Etiquette
> https://wiki.duraspace.org/display/DSPACE/Mailing+List+Etiquette
>
--
You received this message because you are subscribed to the Google Groups
"DSpace Technical Support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/dspace-tech.
For more options, visit https://groups.google.com/d/optout.
