README.md

ALBUS

A Method for efficiently processing SpMV using SIMD and load balancing

our paper:

H. Bian, J. Huang, L. Liu, D. Huang, X. Wang, ALBUS: A method for efficiently processing SpMV using SIMD and Load balancing, Future Generation Computer Systems, Volume 116, 2021, pp. 371-392.

Performance

Unit：GFlops

Equipment：Intel(R) Xeon(R) Gold 6242 CPU (double socket)(16cores * 2)

NOTE:

CSR5(ICS'15)

Merge(SC'16)

CVR(CGO'18)

MKL(Intel oneAPI 2021)

Sparse Matrix	ALBUS	CSR5	CVR	Merge	MKL
rma10	94.52	42.05	65.84
cant	65.38	52.66	68.66
mac_econ_fwd500	68.56	25.33	40.79
mc2depi	75.26	45.10	31.78
shipsec1	33.03	31.14	31.85
scircuit	43.32	20.25	34.35
dc2	65.32	24.59	39.28
amazon-2008	17.82	15.55	13.17
consph	53.14	43.74	51.07
cop20k_A	41.26	36.06	32.16
crankseg_2	24.93	23.22	24.07
ins2	23.06	18.92	34.16
circuit5M	13.02	12.61	11.10
FullChip	13.32	12.63	11.18
mip1	26.21	25.80	26.10
pdb1HYS	65.44	57.03	68.23
pwtk	25.53	24.54	24.18
LP	19.89	19.23	19.54
in-2004	18.36	17.55	15.50
eu-2005	19.98	18.76	16.37
road_usa	6.71	6.56	6.27
roadNet-CA	14.60	12.23	10.86
soc-LiveJournal1	9.31	7.95	8.39
webbase-1M	34.14	21.92	22.13
web-Google	11.23	10.40	8.09
web-Stanford	26.62	18.28	13.42
Stanford	19.65	15.93	11.24
wiki-topcats	15.24	13.62	12.56

Manual:

(1) Enter the make command to compile the Makefile.
$ ls
ALBUS(OpenMP) ALBUS(OpenMP+AVX2) LICENSE README.md
$ cd ALBUS'('OpenMP')'
$ ls
Albus_spmv.h main.cpp Makefile Storage_format.h
$ make
icpc -xCORE-AVX2 -qopt-prefetch=3 -fopenmp -O3 -o spmv_albus main.cpp
$ ls
Albus_spmv.h main.cpp Makefile spmv_albus Storage_format.h

(2) Run "spmv_albus" , Input:
./spmv_albus <matrix name> <iterations times>
$ ls
Albus_spmv.h main.cpp Makefile spmv_albus Storage_format.h dense.mtx
$ ./spmv_albus dense.mtx 4096
------------------------------------------------------------------
FileName : dense.mtx
Iterations : 4096
--------------Matrix Information and Performance Data-------------
(row_num : 2048) , (col_num : 2048) , (nzz_num : 4194304)
( Matrix Kind : real ) , ( Data type : general )
NZZ_NUM : 4194304 (Note: If the matrix is a symmetric, NZZ_NUM <= 2 * nzz_num)
ALBUS parallel time >>>>>> 0.110031 ms
ALBUS parallel SPMV Gflops >>>>>> 76.238752 GFlops
-------------------------ALBUS TEST ANSWER------------------------
i = 0 , mtx_ans = 125136.773347
i = 1 , mtx_ans = 157020.769696
i = 2 , mtx_ans = 190806.910217
i = 3 , mtx_ans = 190497.024711
i = 4 , mtx_ans = 124703.888516
i = 5 , mtx_ans = 659168.485721
i = 6 , mtx_ans = 163069.766193
i = 7 , mtx_ans = 332258.152177
i = 8 , mtx_ans = 161110.817741
i = 9 , mtx_ans = 187378.056863
- - -
- - -
i = 2047 , mtx_ans = 125099.232999
-----------------------Serial CSR TEST ANSWER---------------------
i = 0 , mtx_ans = 125136.773347
i = 1 , mtx_ans = 157020.769696
i = 2 , mtx_ans = 190806.910217
i = 3 , mtx_ans = 190497.024711
i = 4 , mtx_ans = 124703.888516
i = 5 , mtx_ans = 659168.485721
i = 6 , mtx_ans = 163069.766193
i = 7 , mtx_ans = 332258.152177
i = 8 , mtx_ans = 161110.817741
i = 9 , mtx_ans = 187378.056863
- - -
- - -
i = 2047 , mtx_ans = 125099.232999
--------------------------Check Answer----------------------------
right.....PASS!
------------------------------------------------------------------

Note:

(1) The experimental data comes from formerly the University of Florida Sparse Matrix Collection.

(2) This program supports g++ and icc compilation. The Makefile file in this program is initially set to be compiled by the icc compiler. You can also comment the icc compiled code and use the g++ compiler in the file to compile. For comparison experiments, please choose The same compilation environment.

(3) This experiment was tested on two CPU platforms: Dual Socket Intel(R) Xeon(R) CPU E5-2670 v3 and Dual Socket Intel(R) Xeon(R) Silver 4110 CPU .

Cite This:

@article{BIAN2021371,
  title = {ALBUS: A method for efficiently processing SpMV using SIMD and Load balancing},
  journal = {Future Generation Computer Systems},
  volume = {116},
  pages = {371-392},
  year = {2021},
  issn = {0167-739X},
  doi = {https://doi.org/10.1016/j.future.2020.10.036},
  url = {https://www.sciencedirect.com/science/article/pii/S0167739X2033020X},
  author = {Haodong Bian and Jianqiang Huang and Lingbin Liu and Dongqiang Huang and Xiaoying Wang},
  keywords = {SpMV, ALBUS, CSR5, MKL, SIMD, Load balancing},
  abstract = {SpMV (Sparse matrix–vector multiplication) is widely used in many fields. Improving the performance of SpMV has been the pursuit of many researchers. Parallel SpMV using multi-core processors has been a standard parallel method used by researchers. In reality, the number of non-zero elements in many sparse matrices is not evenly distributed, so parallelism without preprocessing will cause a large amount of performance loss due to uneven load. In this paper, we propose ALBUS (Absolute Load Balancing Using SIMD (Single Instruction Multiple Data)), a method for efficiently processing SpMV using load balancing and SIMD vectorization. On the one hand, ALBUS can achieve multi-core balanced load processing; on the other hand, it gives full play to the ability of SIMD vectorization parallelism under the CPU. We selected 20 sets of regular matrices and 20 sets of irregular matrices to form the Benchmark suite. We performed SpMV performance comparison tests on ALBUS, CSR5 (Compressed Sparse Row 5), Merge(Merge-based SpMV), and MKL (Math Kernel Library) under the same conditions. On the E5-2670 v3 CPU platform, For 20 sets of regular matrices, ALBUS can achieve an average speedup of 1.59x, 1.32x, 1.48x (up to 2.53x, 2.22x, 2.31x) compared to CSR5, Merge, MKL, respectively. For 20 sets of irregular matrices, ALBUS can achieve an average speedup of 1.38x, 1.42x, 2.44x (up to 2.33x, 2.24x, 5.37x) compared to CSR5, Merge, MKL, respectively.}
}