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Merge branch 'master' of github.com:RRZE-HPC/TheBandwidthBenchmark

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Jan Eitzinger
2019-03-13 15:27:44 +01:00
parent bd9c83d34b 101efd0a3b
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README.md
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# The Bandwidth Benchmark
This is a collection of simple streaming kernels for teaching purposes.
It is heavily inspired by John McCalpin's https://www.cs.virginia.edu/stream/.
It is heavily inspired by John McCalpin's https://www.cs.virginia.edu/stream/ benchmark.
It contains the following streaming kernels with corresponding data access pattern (Notation: S - store, L - load, WA - write allocate):
It contains the following streaming kernels with corresponding data access pattern (Notation: S - store, L - load, WA - write allocate). All variables are vectors, s is a scalar:
* init (S1, WA): Initilize an array. Store only.
* sum (L1): Vector reduction. Load only.
* copy (L1, S1, WA): Classic memcopy.
* update (L1, S1): Update a vector. Also load + store but without write allocate.
* init (S1, WA): Initilize an array: `a = s`. Store only.
* sum (L1): Vector reduction: `s += a`. Load only.
* copy (L1, S1, WA): Classic memcopy: `a = b`.
* update (L1, S1): Update vector: `a = a * scalar`. Also load + store but without write allocate.
* triad (L2, S1, WA): Stream triad - `a = b + b * scalar`.
* daxpy (L2, S1): Daxpy - `a = a + b * scalar`.
* striad (L3, S1, WA): Schoenauer triad - `a = b + c * d`.
* sdaxpy (L3, S1): Schoenauer triad without write allocate - `a = a + b * c`.
As added benefit the code is a blueprint for a minimal benchmarking application with a generic makefile and modules for aligned array allocation, accurate timing and affinity settings. Those components can be used standalone in your own project.
## Build
@@ -27,7 +28,19 @@ TAG = GCC # Supported GCC, CLANG, ICC
OPENMP = -fopenmp
```
3. Build with:
3. Adjust options set in config.mk:
```
OPTIONS = -DSIZE=40000000ull
OPTIONS += -DNTIMES=10
OPTIONS += -DARRAY_ALIGNMENT=64
#OPTIONS += -DVERBOSE_AFFINITY
#OPTIONS += -DVERBOSE_DATASIZE
#OPTIONS += -DVERBOSE_TIMER
```
The verbosity options enable detailed output about affinity settings, allocation sizes and timer resolution.
4. Build with:
```
make
```
@@ -39,7 +52,7 @@ To output the executed commands use:
make Q=
```
4. Clean up with:
5. Clean up with:
```
make clean
```
@@ -50,7 +63,7 @@ make distclean
```
to clean intermediate build results and binary.
5. (Optional) Generate assembler:
6. (Optional) Generate assembler:
```
make asm
```