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Madgraph5 GPU development - !! ATTENTION THURSDAY !!
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Virtual (Zoom)
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Madgraph5 GPU development
- Zoom Meeting ID
- 63368133283
- Host
- Stefan Roiser
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Stefan Roiser
# Dev meeting 30.06.22
Present: AV, SR, TC, NN, CV, OM, WH
## Rehearsal of ICHEP talk
OM: conclusions confucing
- do not repeat the numbers here. just say that we are faster because of SIMD
(do not mention helicity recycling here)
(single vs double remove as well?)
TC not sw engineers, we can run on GPUs,
and give an x5-x8 on high ened CPUs
- PFs in red
Dropping slides?
- OM: slides 3 and 4 too detailed, put them in backup (maybe have a less detailed one)
- NN: maybe avoid outline for a short talk! (AV: maybe keep the three areas of development)
Three points?
AV maybe remove slide 5? put it in backup
OM otherwise just remove the previous three
Do keep the DOI however
References?
AV do I need to keep Taylor's references?
TC: no not important
Slides on lockstep and MC dice?
TC: keep the roulette, a physics understands that, remove the SIMD/SIMT
Slide on epochs: OM go to backup slides
Motivation: lighter
MG and madgraph4gpu: merge as a single slides
OM: On the results table, remove fortran?
Or redo it with
Slide madevent: too dense
WH: tables is difficult, should use a bar plot instead...
TC: point out amdahl, we sped up the ME as much as we can
OM: same table (or plot) format for cudacpp and for madevent
Agreed!
- table, not bar plot
- BUT only the factors in the table
- and for madevent, put BOTH the ME factor and the overall factro
Some discussion on AVX512 or not - just give CERN table
AV: mention we reach theoretical limits
AV: and mention we reach theoretical limit somewhere
OM: people dont know what AVX512 is... AV say 512 bits?
Slide on Portability Framework?
TC: move it to backup, just introduce them in a light way
OM: just a motivation slide with three logos of PFs and three logos of vendors
AV: mini title slides?
Results slides on PFs?
TC: you gave maybe a bit too little details compared to others?
TC: for first slide was ok, mention filling GPU and
NN: for sycl being hgogher thatshamay be related to clang?
AV: how about we remove the eemumu plots? maybe it includes memory copies...
TC: we should check, I remember that initially we were handling diferemtly the data copies
AV: yes exactly
AV: note that sycl is better than cuda in v100 for ggttgg! so that I would leav in
NN: would prefer to leave it in
agreed: keep eemumu in first slide (mention overheads), remove it in the second
(overheads of launchking kernels etc too)
slide on cpu and pfs
AV: keep it or leave it?
TC: keep it, and mention doing apples to apples
PFs code runs out of the box with reasonable performance also on CPUs
The cudacpp implementation handles both vectorization and threading at a much lower level
WH/OM: slide 11 to backup?
TC/NN: ok, but add one sentence on previous slide "PFs also run out of the box on CPUs"
(performance under investigation)
Slide on outlook in MEs?
Agree to skip it and move it to backup
AV: Maybe extract two-three main outlook points frfom both here and madevent
Slide on outlook in madevent?
OM: more interesting, at leas t top part, maybe in conclusions?
Slide on madevent reengineering
OM: remove bullet two?
In the ened we agree to keep it
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