On 6/30/14, 9:57 AM, Anil Saldhana wrote:
On 06/30/2014 09:53 AM, Andrig Miller wrote:
>
>
> ------------------------------------------------------------------------
>
> *From: *"Jozef Hartinger" <jharting(a)redhat.com>
> *To: *"Andrig Miller" <anmiller(a)redhat.com>,
"wildfly-dev"
> <wildfly-dev(a)lists.jboss.org>
> *Sent: *Monday, June 30, 2014 4:03:59 AM
> *Subject: *Re: [wildfly-dev] CDI overhead
>
> I guess that the Weld subsystem is enabled for your deployment
> because the deployment contains session beans. CDI is required to
> be enabled for such deployments since CDI 1.1 (even though CDI may
> not actually be used by your application).
>
> Why is it required, if it will never be used? Is that really what the
> spec says? If so, why in the world would be support that in the
> spec? That simply doesn't make any sense to me. Perhaps I'm missing
> something here.
>
> Andy
Can we not enable some flag at the deployment level to disable CDI scanning?
That's what Stuart's suggestion does:
"You can remove it per-deployment using exclude-subsystem in
jboss-deployment-structure.xml."
> Alternatively to removing the Weld subsystems you can:
>
> 1) Suppress implicit bean archives - only archives with explicit
> beans.xml file will trigger CDI enablement. See
>
http://weld.cdi-spec.org/documentation/#4
>
> 2) Enable CDI contexts for certain URL subset only:
>
http://docs.jboss.org/weld/reference/2.2.2.Final/en-US/html/configure.htm...
>
> Jozef
>
> On 06/27/2014 06:44 PM, Andrig Miller wrote:
>
> I should have posted this some time ago, but just forgot.
>
> In my early testing of Wildfly 8, CDI adds quite a bit of
> overhead (12% reduction in throughput) for even an application
> that only uses servlets. The only way I could get that back
> was to remove the subsystem. In talking with Stuart at the
> time, he was looking at ways to make the overhead less.
>
> Is there anything on the docket for making this overhead go
> away for deployments that don't require CDI? If not, can we
> get something going in that direction. It would be great to
> not have to remove the CDI subsystem, but not have it impact
> performance for deployments that don't use it.
>
> Thanks.
>
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Brian Stansberry
Senior Principal Software Engineer
JBoss by Red Hat