MAGMA Forum

by **albertotrj** » Fri Feb 24, 2012 6:26 pm

Hi,

I am trying to use MAGMA to calculate the inverse of a matrix (not to solve a linear system), but I had problems when my test matrix had N=3052.

As I am running on a GeForce GTX590, the sizes in testing_zgetri_gpu.cpp don't fit in my GPU's memory, so I modified the sizes array to run from N=3000 to N=3100 with steps of 10. The results of the tests are:

Code: Select all: device 0: GeForce GTX 590, 1215.0 MHz clock, 1535.7 MB memory, capability 2.0 device 1: GeForce GTX 590, 1215.0 MHz clock, 1535.6 MB memory, capability 2.0 N CPU GFlop/s GPU GFlop/s ||R||_F / ||A||_F ======================================================== 3000 48.24 64.50 2.261154e-14 3010 46.93 62.68 1.157349e-14 3020 42.52 63.02 1.005624e-14 3030 46.84 63.34 6.146287e-14 3040 48.14 63.73 2.019102e-14 3050 47.88 63.39 2.696969e-14 3060 48.41 64.51 1.315522e-14 3070 48.05 65.07 2.235858e-14 3080 47.61 62.90 3.577268e-14 3090 47.62 63.16 1.497066e-14 3100 47.95 63.68 1.115748e-13

Everything OK here!
However, if I run the tests for each N separately, I get (for easier visualization I pasted them together):

Code: Select all: N CPU GFlop/s GPU GFlop/s ||R||_F / ||A||_F ======================================================== 3000 41.54 64.58 2.261154e-14 3010 37.99 62.62 3.026024e-14 3020 47.02 63.07 1.873797e-14 3030 47.34 99.49 5.027260e-02 <-- 3040 44.50 100.47 4.631249e-02 <-- 3050 46.11 101.64 1.768814e-01 <-- 3060 47.76 102.28 1.211222e-01 <-- 3070 46.76 103.46 6.297906e-02 <-- 3080 44.51 62.93 1.146775e-14 3090 43.01 63.17 1.491277e-14 3100 46.33 63.74 1.978944e-14

Does anyone have a hint on whats happening?

Thanks,
Alberto

by **albertotrj** » Mon Feb 27, 2012 11:38 am

Hi people,

I have run more tests and the problem happens for 3025 <= N <= 3072.
By the way, magma_zgetrf_gpu runs fine for the same N.

Alberto.

by **albertotrj** » Wed Feb 29, 2012 2:20 pm

Hi again,

I have run more tests, on a Tesla M2050 this time, and it seems there is a bug (I guess) in the *getri_gpu routines:

Code: Select all: ./testing_sgetri_gpu -N 3050 device 0: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 device 1: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 N CPU GFlop/s GPU GFlop/s ||R||_F / ||A||_F ======================================================== 3050 55.43 180.61 1.537267e-05

Code: Select all: ./testing_dgetri_gpu -N 3050 device 0: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 device 1: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 N CPU GFlop/s GPU GFlop/s ||R||_F / ||A||_F ======================================================== can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture can not bind to texture 3050 28.21 100.51 2.070095e-01

Code: Select all: ./testing_cgetri_gpu -N 3050 device 0: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 device 1: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 N CPU GFlop/s GPU GFlop/s ||R||_F / ||A||_F ======================================================== 3050 68.57 409.81 1.756635e-01

Code: Select all: ./testing_zgetri_gpu -N 3050 device 0: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 device 1: Tesla M2050, 1147.0 MHz clock, 2687.4 MB memory, capability 2.0 N CPU GFlop/s GPU GFlop/s ||R||_F / ||A||_F ======================================================== 3050 36.30 113.79 1.768814e-01

Here is may make.inc:

Code: Select all: GPU_TARGET = 1 CC = icc NVCC = nvcc FORT = ifort ARCH = ar ARCHFLAGS = cr RANLIB = ranlib OPTS = -O3 -DADD_ -xHost FOPTS = -O3 -DADD_ -cpp -xHost NVOPTS = --compiler-options -fno-strict-aliasing -DUNIX -O3 -DADD_ LDOPTS = -fPIC -nofor_main -Xlinker -zmuldefs LIB = -lmkl_intel_lp64 -lmkl_intel_thread -lmkl_core -liomp5 -lpthread -lcublas -lcudart -lm CUDADIR = /usr/local/cuda LIBDIR = -L$(MKLROOT)/lib/intel64 \ -L$(CUDADIR)/lib64 INC = -I$(CUDADIR)/include #LIBMAGMA = $(MAGMA_DIR)/lib/magma.a #LIBMAGMABLAS = $(MAGMA_DIR)/lib/magmablas.a

I am using the Intel Compiler Version 12.0.0

Alberto.

by **mgates3** » Thu Mar 01, 2012 3:17 pm

We will look into it.
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