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RenderKit / ospray

An Open, Scalable, Portable, Ray Tracing Based Rendering Engine for High-Fidelity Visualization
http://ospray.org
Apache License 2.0
1.01k stars 182 forks source link

Ospray does not build without TBB #41

Closed ghost closed 8 years ago

ghost commented 8 years ago

On develop branch I can't find a way to build the ospray if TBB is not present on the system.

jeffamstutz commented 8 years ago

This is not a bug as TBB is now being used as the main tasking system for OSPRay. It is a very common library, as it can be found packaged with the Intel compiler, in almost every Linux distro's package manager, and on OS X via Homebrew or MacPorts.

It is possible to build OSPRay using OpenMP by specifying the CMake variable OSPRAY_TASKING_SYSTEM=OpenMP. We have not done any tuning with OpenMP and thus it does not perform as well as TBB. Continuing to support OpenMP as an option has not be decided, but it exists for now.

ghost commented 8 years ago

I have set OSPRAY_TASKING_SYSTEM=OpenMP and it still does not build, hence the bug report. The error message is:


CMake Error: The following variables are used in this project,
 but they are set to NOTFOUND.
 Please set them or make sure they are set and tested correctly in
 the CMake files:
 TBB_LIBRARY
     linked by target "ospray" in directory
 /home/pk/pool/ospray/ospray
     linked by target "ospParticleViewer" in directory
 /home/pk/pool/ospray/apps/particleViewer
 TBB_LIBRARY_MALLOC
     linked by target "ospray" in directory
 /home/pk/pool/ospray/ospray
     linked by target "ospParticleViewer" in directory
 /home/pk/pool/ospray/apps/particleViewer
ghost commented 8 years ago

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//Test OpenMP_FLAG_DETECTED
OpenMP_FLAG_DETECTED:INTERNAL=1
//Enables backface culling.
RTCORE_BACKFACE_CULLING:INTERNAL=OFF
//Enables buffer strides.
RTCORE_BUFFER_STRIDE:INTERNAL=ON
//Enables ray stream logger.
RTCORE_ENABLE_RAYSTREAM_LOGGER:INTERNAL=OFF
//Lets Embree library export all symbols.
RTCORE_EXPORT_ALL_SYMBOLS:INTERNAL=ON
//Ignores invalid rays.
RTCORE_IGNORE_INVALID_RAYS:INTERNAL=OFF
//Enables intersection filter callback.
RTCORE_INTERSECTION_FILTER:INTERNAL=ON
//Enables ray mask support.
RTCORE_RAY_MASK:INTERNAL=ON
//Enabled support for ray packets.
RTCORE_RAY_PACKETS:INTERNAL=ON
//Enables statistic counters.
RTCORE_STAT_COUNTERS:INTERNAL=OFF
//STRINGS property for variable: RTCORE_TASKING_SYSTEM
RTCORE_TASKING_SYSTEM-STRINGS:INTERNAL=TBB;INTERNAL
RTCORE_TASKING_SYSTEM:INTERNAL=Internal
//Enable triangle pairs.
RTCORE_TRIANGLE_PAIRS:INTERNAL=OFF
//ADVANCED property for variable: TBB_INCLUDE_DIR_MIC
TBB_INCLUDE_DIR_MIC-ADVANCED:INTERNAL=1
//ADVANCED property for variable: TBB_LIBRARY_MALLOC_MIC
TBB_LIBRARY_MALLOC_MIC-ADVANCED:INTERNAL=1
//ADVANCED property for variable: TBB_LIBRARY_MIC
TBB_LIBRARY_MIC-ADVANCED:INTERNAL=1
//ADVANCED property for variable: USE_IMAGE_MAGICK
USE_IMAGE_MAGICK-ADVANCED:INTERNAL=1
//STRINGS property for variable: XEON_ISA
XEON_ISA-STRINGS:INTERNAL=SSE2;SSE3;SSSE3;SSE4.1;SSE4.2;AVX;AVX-I;AVX2;AVX512
XEON_ISA:INTERNAL=SSE4.2
jeffamstutz commented 8 years ago

Oops, definitely a bug. :)

I should be able to get this fixed today. I'll post here when it's ready....sorry for jumping to the wrong conclusion!

jeffamstutz commented 8 years ago

The fix should now be in both 'release-0.9' and 'devel'. Please let me know if you continue to have issues.

ghost commented 8 years ago

No worries. Anyhow, it is not fixed; look at this commit version of the CMakeLists.txt https://github.com/ospray/OSPRay/blob/3acde31056aa23fade7216733162be2634209287/ospray/CMakeLists.txt

There is OpenMP option working. Now if you look at the recent version of the same file and go to line 313, there are two variables TBB_LIBRARY and TBB_LIBRARY_MALLOC which are not found if the TBB is not set. These two are the culprits.

jeffamstutz commented 8 years ago

The latest changes I did this morning unset the cache values for TBB_LIBRARY and TBB_LIBRARY_MALLOC (and their mic equivalents) if the OpenMP backend is selected. I've successfully used the following steps in an environment which does not have TBB:

  1. configure OSPRay in a blank build directory (fails to find TBB)
  2. change OSPRAY_TASKING_SYSTEM to OpenMP in ccmake
  3. configure OSPRay again (succeeds)

You can also specify -DOSPRAY_TASKING_SYSTEM=OpenMP on the command line during initial configuration if you want to configure OSPRay from scratch all in one go without TBB.

Perhaps you are asking for OSPRay to automatically use OpenMP if TBB is not found? If so, we want users to explicitly choose OpenMP right now because of performance issues (a.k.a. we want to steer users to build with TBB).

ghost commented 8 years ago

Sorry, I forgot to pull your commit. All works now, thank you.