Re: [Gems-users] Adding a handler in Opal for I/O instructions

[Philip Garcia <pcgarcia@xxxxxxxx>]

I figured out my problem.  I had a list of outstanding I/O  
instructions, and was not updating it to remove the instructions if a  
pipeline flush occurs.  Taking this into account should solve my  
problem.
Phil
On Sep 30, 2008, at 8:27 PM, Philip Garcia wrote:

> Hello,
> I was wondering if anyone is familiar with how to add delays into
> Opals pipeline.  I am trying to add a delay so that certain I/O loads
> and stores get delayed by a set amount.  I have found the relevant
> place in load_inst_t::Execute where Opal checks if a memory operation
> is to an IO instruction, but if it is, I am unsure of how to delay
> it.  I tried adding a simple delay that doesn't set the stage to
> COMPLETE_STAGE until a static number of cycles passes, but this
> appears to cause opal to crash, as instructions in the queue end up
> having no stage associated with them.  However, when I tried adding my
> own stage into Dynamic.h which was DELAY_IO_STAGE, and setting the
> memop instructions stage to this, it doesn't appear to ever go into
> the relevant case statement I added in dynamic_inst_t::Schedule, and
> later crashes for the same reason.  I was wondering if maybe I am
> doing something wrong, or misunderstood the organization of this code.
>
> Any help would be greatly appreciated.
>
> thanks,
> Phil
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