[wildfly-dev] CDI overhead

[Anil Saldhana]

On 06/30/2014 09:53 AM, Andrig Miller wrote:
>
>
> ------------------------------------------------------------------------
>
>     *From: *"Jozef Hartinger" <jharting at redhat.com>
>     *To: *"Andrig Miller" <anmiller at redhat.com>, "wildfly-dev"
>     <wildfly-dev at 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?

>     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.html#context.mapping
>
>     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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