Hmm,
interesting, one more question, could you pls. check how the profile
data look like when you stop loading the server.
So first you load the server, make sure that DefaultSelectorHandler
consumes its 60%+ of CPU and then stop the load.
Can you pls. also double check that CPU consumption in general is low
after you stop the server. Just want to make sure it's not related to
selector spin problem observed with JDK 6.
Thanks.
WBR,
Alexey.
On 11.06.15 18:10, Broide Uri wrote:
>
> As requested.
>
> As you can see in the screenshot the select method on idle process is idle
>
> *From:*Oleksiy Stashok [mailto:oleksiy.stashok_at_oracle.com]
> *Sent:* Thursday, June 11, 2015 12:21 PM
> *To:* users_at_grizzly.java.net
> *Subject:* Re: CPU Usage Profiling
>
> Hi Uri,
>
> can you pls. profile the server without loading at all to see the diff?
> As I mentioned before, Selector.select(...) usually is reported as a
> hotspot, so I don't think your report is suspicious, but let's double
> check.
>
> Thanks.
>
> WBR,
> Alexey.
>
> On 11.06.15 09:22, Broide Uri wrote:
>
> Hi Alexey,
>
> Any update?
>
> Thanks
>
> Uri
>
> *From:*Meltser Tiran [mailto:Tiran.Meltser_at_comverse.com]
> *Sent:* Tuesday, June 09, 2015 7:56 PM
> *To:* users_at_grizzly.java.net <mailto:users_at_grizzly.java.net>
> *Subject:* RE: CPU Usage Profiling
> *Importance:* High
>
> Hi Alexey,
>
> We don’t think this is the case as (I hope) you can see the graph
> is sorted by *Self Time (CPU)*.
>
> *Tiran Meltser***
> System Architect
> Global Products & Operations
> *Comverse* – /Making Your Network Smarter/
>
> T +972-3-7678381
> M +972-54-5639381
> Tiran.Meltser_at_comverse.com <mailto:Tiran.Meltser_at_comverse.com>
> *www.comverse.com <http://www.comverse.com/> *
>
> *P****Please think of the environment before printing this email***
>
> *From:*Oleksiy Stashok [mailto:oleksiy.stashok_at_oracle.com]
> *Sent:* Tuesday, June 09, 2015 7:21 PM
> *To:* users_at_grizzly.java.net <mailto:users_at_grizzly.java.net>
> *Subject:* Re: CPU Usage Profiling
>
> Hi Uri,
>
> I suspect what you see is the total time spent inside the method,
> but most of the time it's in the idle state waiting for I/O
> events, so it shouldn't consume CPU.
> Please let me know if it's not the case.
>
> WBR,
> Alexey.
>
> On 09.06.15 16:29, Broide Uri wrote:
>
> Hi Alexey,
>
> After stabilizing on 100% Success Rate in heavy load on our
> application we started to perform CPU Usage profiling.
>
> We have noticed (you can see the attached screenshot) that we
> are spending 66% from the CPU time in the
> *org.glassfish.nio.DefaultSelectorHandler.select()* method.
>
> We are running the load with the following environment:
>
> ·Grizzly 2.3.21
>
> ·JDK 1.7.0_72-b14
>
> ·RHEL 5.X
>
> Any advice on how can we improve the high CPU consumption?
>
> cid:image003.jpg_at_01D0A2D6.6204FEE0
>
> Thanks
>
> Uri
>
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