From: Meltser Tiran <Tiran.Meltser_at_comverse.com>
Date: Thu, 18 Jun 2015 18:07:25 +0000

Hi Alexey (working with Efrat and Uri) :),

First we don’t keep the connections open as this is an IMAP server (or proxy).

Second, I agree that SSL channel should have some performance price but what we experience is far beyond a reasonable price, after making another check we see we have response times slower 600 times than plain communication…

Third, we are running on a 16 cores machine in which SSL should hardly be noticed.

Forth, we have just compared the SSL experience to our previous server written in C++ some more than 10 years ago and operated on machines with about ¼ CPU power (or even less), and load results show response time was doubled at max (not 600 times worse).

Can you have a look on the hot method the profiler is showing and see if something can be done there (or maybe give us some guideline)?

Tiran Meltser
System Architect
Global Products & Operations
Comverse – Making Your Network Smarter

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From: Oleksiy Stashok [mailto:oleksiy.stashok_at_oracle.com]
Sent: Thursday, June 18, 2015 8:16 PM
To: users_at_grizzly.java.net
Subject: Re: High CPU Usage on SSL utils

Hi Efrat,

do you keep connections alive?
In general SSL is not for free and it's expected to be slower than plain communication.

WBR,
Alexey.

On 18.06.15 18:14, Ben-Yosef Efrat wrote:
Also, we see higher response times then before (around 50 times longer)

From: Ben-Yosef Efrat [mailto:Efrat.Ben-Yosef_at_comverse.com]
Sent: Thursday, June 18, 2015 6:54 PM
To: users_at_grizzly.java.net<mailto:users_at_grizzly.java.net>
Cc: Broide Uri; Meltser Tiran
Subject: High CPU Usage on SSL utils

Hi Alexey,

Continuing Uri’s query about the CPU, we moved to java8 profiler and as you said, indeed not the select() was the issue.
Now, we added the SSL to the picture (utilizing Grizzly’s SSLfilter) and as you can see in the attached screenshot, the executeDelegatedTask() method consumes a lot of CPU (we sort by self-tile CPU).

Please advise,
Thanks,
Efrat


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