[Paraview] Confirming that pvserver runs with OSMesa + OpenSWR driver on cpu only compute nodes

[Burlen Loring]

Hi Fabrizio,

in the shell where you launch your pvserver you could set the following 
environment variables:

    export LIBGL_ALWAYS_SOFTWARE=1 GALLIUM_DRIVER=swr

this is bash syntax, your shell may be different. When I do that I see 
"SWR detected AVX" print in that shell when the connection to paraview 
client is made.

Burlen

On 12/21/2017 08:02 AM, Fabrizio Bisetti wrote:
> Hello there:
>
> I've successfully built and installed the following OSMesa rendering stack (from source) for use on CPU only compute nodes of a small cluster
>
> I've then built Paraview 5.4.0 (from source). The pvserver runs on a compute node and we connect to it from a remote Paraview client via forward connection with SSH tunneling.
>
> I am having trouble confirming which driver the pvserver uses for rendering. My understanding is that OSMesa gets compiled with various cpu-based driver options, i.e. soft pipe (classic OSMesa), llvmpipe, and swr.
>
> I would like to ensure that swr (OpenSWR) is being used.
>
> Note that one complicating factor is that the CPU-based compute nodes do not have any X installed and I've compiled only OSMesa (see below). Thus, I cannot compile the GLUT based utility glinfo or gears, which could possibly tell me how the rendering is done.
>
> Finally, while it seems that one can invoke paraview with a switch --mesa-swr-avx2, I am not sure that can be done with pvserver.
>
> Also, even then, how would I confirm this is which driver is being used?
>
> Thank you for any help/pointers.
>
> Fabrizio
>
>
>
>
> **HARDWARE**
>
> Each compute node features two (x2) Intel(R) Xeon(R) CPU E5-2690 v4 @ 2.60GHz for a total of 28 cores. The compute nodes do not have a GPU.
>
> **SOFTWARE STACK**
>
> Everything is compiled with gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC) on a Linux 3.10.0-514.el7.x86_64 (Centos 7).
>
> Here is the cpu-based rendering stack
>
> 1) LLVM 5.0.0
>
> cmake3 -G "Unix Makefiles"  \
>         -DCMAKE_BUILD_TYPE=Release \
>         -DLLVM_TARGETS_TO_BUILD=X86 \
>         -DLLVM_INSTALL_UTILS=TRUE \
>         -DLLVM_ENABLE_RTTI=TRUE \
>         -DBUILD_SHARED_LIBS=TRUE \
>         -DCMAKE_INSTALL_PREFIX=$INSTALLDIR \
>         ../llvm-5.0.0.src
>
> 2) Mesa3D 17.3.0
>
> Note that the compute nodes do not have any X servers (X11) nor any other OpenGL implementation (e.g. repo based from a yum install)
>
> ./configure \
>      --disable-xvmc \
>      --disable-glx \
>      --disable-dri \
>      --with-dri-drivers= \
>      --with-gallium-drivers=swrast,swr \
>      --enable-texture-float \
>      --disable-egl \
>      --disable-gbm \
>      --with-platforms= \
>      --enable-gallium-osmesa \
>      --enable-llvm \
>      --prefix=$INSTALLDIR
>
> 3) GLU 9.0.0
>
> SITE_MESA_LIB=/path/to/mesa/install/above
>
> PKG_CONFIG_PATH="$SITE_MESA_LIB/pkgconfig" \
> OSMESA_LIBS="-L$SITE_MESA_LIB -lOSMesa" \
>      ./configure --prefix=$INSTALLDIR \
>      --enable-osmesa \
>      --enable-shared
>
> 4) ParaView 5.4.0
>
> I've configured the basic ParaView build as recommended.
> I am using OpenMPI 2.1.0 compiled with the system gcc.
>
> The additional OSMesa options are as below:
>
> VTK_USE_X=OFF
> VTK_USE_OFFSCREEN:BOOL=ON
>
> OPENGL_INCLUDE_DIR=/path/to/mesa/install/above/include
> OPENGL_gl_LIBRARY:FILEPATH=/path/to/mesa/install/above/lib/libOSMesa.so
> OPENGL_glu_LIBRARY:FILEPATH=/path/to/glu/install/above/lib/libGLU.so
>
> VTK_OPENGL_HAS_OSMESA:BOOL=ON
> OSMESA_INCLUDE_DIR:PATH=/path/to/mesa/install/above/include
> OSMESA_LIBRARY:FILEPATH=/path/to/mesa/install/above/lib/libOSMesa.so
>
> Note that I've set everything to point to the OSMesa install directory.
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