Skip to content

Crusher: Fix FLOPS calculation for SQ_INSTS_VALU_MFMA_MOPS_* #973

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Crusher: Fix FLOPS calculation for SQ_INSTS_VALU_MFMA_MOPS_* #973

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
12 changes: 6 additions & 6 deletions systems/crusher_quick_start_guide.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1819,7 +1819,7 @@ Achieved FLOPS/s

We calculate the achieved performance at the desired level (here, double-precision floating point, FP64), by summing each metric count and weighting the FMA metric by 2, since a fused multiply-add is considered 2 floating point operations.
Also note that these ``SQ_INSTS_VALU_<ADD,MUL,TRANS>`` metrics are reported as per-simd, so we mutliply by the wavefront size as well.
The ``SQ_INSTS_VALU_MFMA_MOPS_*`` instructions should be multiplied by the ``Flops/Cycle/CU`` value listed above.
The ``SQ_INSTS_VALU_MFMA_MOPS_*`` instructions should be multiplied by 512.
We use this equation to calculate the number of double-precision FLOPS:

.. math::
Expand All @@ -1828,7 +1828,7 @@ We use this equation to calculate the number of double-precision FLOPS:
&+ SQ\_INSTS\_VALU\_MUL\_F64 \\\\
&+ SQ\_INSTS\_VALU\_TRANS\_F64 \\\\
&+ 2 * SQ\_INSTS\_VALU\_FMA\_F64) \\\\
+ 256 *&(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F64)
+ 512 *&(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F64)


When ``SQ_INSTS_VALU_MFMA_MOPS_*_F64`` instructions are used, then 47.8 TF/s is considered the theoretical maximum FLOPS/s.
Expand Down Expand Up @@ -1857,10 +1857,10 @@ The above formula can be adapted to compute the total FLOPS across all floating-
&+ SQ\_INSTS\_VALU\_MUL\_F64 \\\\
&+ SQ\_INSTS\_VALU\_TRANS\_F64 \\\\
&+ 2 * SQ\_INSTS\_VALU\_FMA\_F64) \\\\
+ 1024 &*(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F16) \\\\
+ 1024 &*(SQ\_INSTS\_VALU\_MFMA\_MOPS\_BF16) \\\\
+ 256 *&(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F32) \\\\
+ 256 *&(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F64) \\\\
+ 512 &*(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F16) \\\\
+ 512 &*(SQ\_INSTS\_VALU\_MFMA\_MOPS\_BF16) \\\\
+ 512 *&(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F32) \\\\
+ 512 *&(SQ\_INSTS\_VALU\_MFMA\_MOPS\_F64) \\\\


Arithmetic Intensity
Expand Down