https://github.com/rrze-hpc/thebandwidthbenchmark-f90
Fortran version of the ultimate teaching bandwidth benchmark.
https://github.com/rrze-hpc/thebandwidthbenchmark-f90
benchmark fortran
Last synced: 17 days ago
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Fortran version of the ultimate teaching bandwidth benchmark.
- Host: GitHub
- URL: https://github.com/rrze-hpc/thebandwidthbenchmark-f90
- Owner: RRZE-HPC
- License: mit
- Created: 2019-03-11T11:20:51.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2019-03-11T14:57:19.000Z (about 6 years ago)
- Last Synced: 2025-04-24T00:13:27.101Z (17 days ago)
- Topics: benchmark, fortran
- Language: Fortran
- Homepage:
- Size: 10.7 KB
- Stars: 2
- Watchers: 10
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# The Bandwidth Benchmark (Fortran version)
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 contains the following streaming kernels with corresponding data access pattern (Notation: S - store, L - load, WA - write allocate):
* 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.
* 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`.
## Build
1. Configure the toolchain to use in the `Makefile`:
```
TAG = GFORTRAN # Supported GFORTRAN, IFORT
```
2. Review the flags for toolchain in the corresponding included file, e.g. `include_GFORTRAN.mk`. OpenMP is disabled per default, you can enable it by uncommenting the OpenMP flag:
```
OPENMP = -fopenmp
```
3. Build with:
```
make
```
You can build multiple toolchains in the same directory, but notice that the Makefile is only acting on the one currently set.
Intermediate build results are located in the `` directory.
4. Clean up with:
```
make clean
```
to clean intermediate build results.
```
make distclean
```
to clean intermediate build results and binary.
5. (Optional) Generate assembler:
```
make asm
```
The assembler files will also be located in the `` directory.
## Usage
To run the benchmark call:
```
./bwBench-
```
The benchmark will output the results similar to the stream benchmark. Results are validated.
For threaded execution it is recommended to control thread affinity.
We recommend to use likwid-pin for benchmarking:
```
likwid-pin -c 0-3 ./bwbench-GFORTRAN
```
Example output for threaded execution:
```
[pthread wrapper]
[pthread wrapper] MAIN -> 0
[pthread wrapper] PIN_MASK: 0->1 1->2 2->3
[pthread wrapper] SKIP MASK: 0x0
threadid 140210970978048 -> core 1 - OK
threadid 140210962585344 -> core 2 - OK
threadid 140210954192640 -> core 3 - OK
----------------------------------------------
Number of Threads = 4
----------------------------------------------
-------------------------------------------------------------
Function Rate (MB/s) Avg time Min time Max time
Init: 15068.23 0.0123 0.0106 0.0112
Sum: 21384.63 0.0088 0.0075 0.0082
Copy: 18854.08 0.0190 0.0170 0.0174
Update: 28157.37 0.0129 0.0114 0.0114
Triad: 19215.55 0.0281 0.0250 0.0263
Daxpy: 26606.76 0.0203 0.0180 0.0182
STriad: 21279.46 0.0339 0.0301 0.0309
SDaxpy: 26629.39 0.0271 0.0240 0.0240
-------------------------------------------------------------
```