Bandwidth fix

[sofiemartins]

The GPU bandwidth was overestimated, because a write was counted as a read/write, which is right for CPUs but not for streaming devices such as GPUs.

Note: This was manually accounted for in the proceedings.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.73%. Comparing base (aedc195) to head (693aa2a).
Report is 90 commits behind head on HiRep-CUDA.

Additional details and impacted files

@@              Coverage Diff               @@
##           HiRep-CUDA     #124      +/-   ##
==============================================
+ Coverage       49.02%   49.73%   +0.70%     
==============================================
  Files             193      383     +190     
  Lines           30047    58989   +28942     
  Branches         6176    11388    +5212     
==============================================
+ Hits            14731    29337   +14606     
- Misses          13789    26801   +13012     
- Partials         1527     2851    +1324     

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