Hi Uri,
I saw you were using 1.7, just wanted to double check.
After stopping the load, can you check what is the CPU consumption rate
of the server process?
Thanks.
WBR,
Alexey.
On 11.06.15 19:13, Broide Uri wrote:
>
> Hi Alexey,
>
> As requested, the following is the profile data snapshot after
> stopping the load and waiting till all connections were closed
>
> BTW, we are running with *JDK7* and not 6
>
> Uri
>
> *From:*Oleksiy Stashok [mailto:oleksiy.stashok_at_oracle.com]
> *Sent:* Thursday, June 11, 2015 7:26 PM
> *To:* users_at_grizzly.java.net
> *Cc:* Hasid Ronen; Tsukerman Dana
> *Subject:* Re: CPU Usage Profiling
>
> 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 <mailto: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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