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[Tonko Ljubicic <tonko AT bnl.gov>]

Hi Zhenyu,

it is some effort so I don;t plan to do much unless this becomes
a critical issue. Certainly not casually. Let's see how things evolve
first.

         -- Tonko



On Wed, Dec 22, 2021 at 4:05 PM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
>
> Hi Tonko and Gerard
>
> Thanks for the effort to reduce the dead time.
>
> As you have heard from the trigger board meeting, there is an interest to 
> including forward trackers in mid-rapidity program.
> From what Tonko wrote, there seems to be large room for improvement on FST 
> rate to go up from 4600 to 6500 Hz. If we could do that, it will provide an 
> possibility to include FST in such triggers. I don’t know how much effort 
> on your side is needed to do the code optimization and I would strongly 
> encourage you to do that.
>
> Thanks and Best,
> Zhenyu
>
> > On Dec 22, 2021, at 4:04 AM, Tonko Ljubicic <tonko AT bnl.gov> wrote:
> >
> > Hello Gerard, all,
> >
> > I played a bit with the intrinsic deadtime and:
> >
> > 1) 290 still crashes
> > 2) 300 is OK -- I will set it to 300
> >
> > Running full blast I get 100% dead at:
> >
> > 1) 4600 Hz
> > 2) 140 MB/s per fiber
> > 3) 94% CPU usage
> >
> > Which means that at this point the CPU is the limiting factor.
> > We'll see how it will go in reality, with actual required rates, etc
> > but if we still have a problem I can mess with the code
> > and likely optimize the CPU code more to reach the final
> > limiter which is 200 MB/s per fiber, at ~6500 Hz.
> >
> >        -- Tonko
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