What is the correct way to run compile and benchmarks from benchmark folder?
Norbert X
My CPU is Intel i7-3537u.
I'm using Ubuntu 20.04 LTS, it ships OpenBLAS 0.3.8 < https://packages.ubuntu.com/source/focal/openblas >.
To compare performance of pthread, openmp and serial variants I want to run benchmarks from benchmark folder.
I can't find any documentation about this moment.
As I'm using Ubuntu - I started with packages from Ubuntu's repositories:
sudo apt-get build-dep openblas
cd ~/Downloads
apt-get source --build openblas
This build succeeds, deb-packages are produced. So I think that build-environment is configured correctly.
Then I try to compile benchmarks:
cd openblas-0.3.8+ds/benchmarks
make
and make command fails with the following message:
$ make cc -O2 -DMAX_STACK_ALLOC=2048 -Wall -m64 -DF_INTERFACE_GFORT -fPIC -DSMP_SERVER -DNO_WARMUP -DMAX_CPU_NUMBER=4 -DMAX_PARALLEL_NUMBER=1 -DVERSION=\"0.3.8\" -DASMNAME=sgemm -DASMFNAME=sgemm_ -DNAME=sgemm_ -DCNAME=sgemm -DCHAR_NAME=\"sgemm_\" -DCHAR_CNAME=\"sgemm\" -DNO_AFFINITY -I.. -c -UCOMPLEX -UDOUBLE -o sgemm.o gemm.c
make: *** No rule to make target '../libopenblas_sandybridgep-r0.3.8.a', needed by 'sgemm.goto'. Stop.
Instead of apt-get source --build openblas
I tried also
DEB_CFLAGS_SET="-march=native -mtune=native" dpkg-buildpackage -uc -us -j8
without success.
What am I doing wrong?
Where can I find the mentioned libopenblas_sandybridgep-r0.3.8.a file? Why do I not have it compiled?
What is correct way to launch benchmarks from benchmark folder?
Prentice Bisbal
The benchmarks are part of the source code, so they're expecting
ALL of OpenBLAS to be built and installed according to the
configuration specified in the Makefiles. Since you're only trying
to build the benchmarks, the rest of OpenBLAS hasn't been built
and the resulting libraries aren't where the benchmarks' Makefile
are expecting them to be.
Specifically, the Makefile specifies that the object file that
it's trying to build, sgemm.o, depends on the library libopenblas_sandybridgep-r0.3.8.a,
which it expects to exist in the parent directory of benchmarks.
In short, the benchmarks aren't really meant to be built
and used this way. If you go to the parent directory and do a
'make' there, it will build the library that's missing, but then
the benchmarks will be testing the version of OpenBLAS you just
built, and not the version installed by Ubuntu as a .deb package
You could fix this if you know how to read and edit
Makefiles, which I'm assuming you don't know how to do. Instead,
I would see if Ubuntu provides the benchmarks as a separate .deb
package.
Prentice
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