Wolfgang, Thank you for the reply, I'm glad to see that the developers are keeping an eye on dependencies and startup time.
In my case, I was actually careful to compile deal.ii ONLY against MPI, so there are only seven direct deps, mostly from my homebrew installation of openmpi. But after figuring out the correct tooling to do this on macos and digging a little more, it seems that openmpi's libhwloc is the culprit. Once it pulls in Foundation.framework and IOKit.framework, we are really off to the races. It appears that my ubuntu build in a docker container starts up in about half the time (also just built against MPI). -Jack On Friday, April 19, 2024 at 2:00:29 PM UTC-7 Wolfgang Bangerth wrote: On 4/18/24 23:29, Jack Coughlin wrote: > > As I say, I don't understand the issue well enough to know if there is > anything I or the deal.ii developers can do about it! In any case, 0.25s is a > very small price to pay for so much functionality and expressiveness. Jack, I appreciate the qualification in the last sentence :-) I don't have a Mac, so can't repeat the experiment and tell you what these ~100 libraries are, but I've looked into this on my Linux laptop. There, libdeal_II.g.so directly references the following 54 libraries: Part of Trilinos: libnox.so.13 libamesos2.so.13 libtacho.so.13 libml.so.13 libifpack.so.13 libamesos.so.13 libaztecoo.so.13 libtrilinosss.so.13 libtpetra.so.13 libtpetraclassicnodeapi.so.13 libepetraext.so.13 libzoltan.so.13 libepetra.so.13 libkokkoskernels.so.13 libteuchoscomm.so.13 libteuchosparameterlist.so.13 libteuchoscore.so.13 libkokkoscore.so.13 libsuperlu_dist.so.5 HDF5: libhdf5.so.103 Part of OpenCASCADE: libTKBool.so.11 libTKBRep.so.11 libTKernel.so.11 libTKG3d.so.11 libTKGeomAlgo.so.11 libTKGeomBase.so.11 libTKMath.so.11 libTKMesh.so.11 libTKShHealing.so.11 libTKTopAlgo.so.11 libTKXSBase.so.11 libTKIGES.so.11 libTKSTEP.so.11 libTKSTL.so.11 PETSc and SLEPc: libslepc.so.3.16 libpetsc.so.3.16 libmetis.so MPI: libmpi_cxx.so.40 libmpi.so.40 SUNDIALS: libsundials_idas.so.4 libsundials_arkode.so.4 libsundials_kinsol.so.5 libsymengine.so.0.8 BLAS and LAPACK: liblapack.so.3 libblas.so.3 p4est: libp4est.so.0 libsc.so.0 System and compiler libraries: libgmp.so.10 libz.so.1 libm.so.6 libstdc++.so.6 libgcc_s.so.1 libc.so.6 ld-linux-x86-64.so.2 These are all libraries from which deal.II directly utilizes functionality. It is so many because some of the packages we rely on (notably Trilinos and OpenCASCADE) split their functionality into many separate libraries for reasons unknown to me. Beyond these 54, every executable then pulls in another 27 libraries. These are libraries that, directly or indirectly, one of the 57 above references. For me, these are: More from Trilinos: libgaleri-epetra.so.13 libHYPRE-2.23.0.so libkokkoscontainers.so.13 libteuchosnumerics.so.13 libteuchosparser.so.13 libteuchosremainder.so.13 libthyracore.so.13 libtriutils.so.13 More from OpenCASCADE: libTKBO.so.11 libTKG2d.so.11 libTKPrim.so.11 libTKSTEP209.so.11 libTKSTEPAttr.so.11 libTKSTEPBase.so.11 More from PETSc: libparmetis.so More from MPI: libmpi_mpifh.so.40 libopen-pal.so.40 libopen-rte.so.40 More compiler libraries: libgfortran.so.5 libgomp.so.1 libhwloc.so.15 libquadmath.so.0 Unclear to me: libevent_core-2.1.so.7 libevent_pthreads-2.1.so.7 libmvec.so.1 libudev.so.1 linux-vdso.so.1 (0x00007ffc27ddc000) The example you show, libAudioStatistics.dylib, would fall into this last category. It would be interesting to see which of the dependencies pulls it in. In general, though, from the example above, nearly everything I see is there for a fairly good reason. I will note that you can very substantially slim down if you trim all of the dependencies. You can build deal.II without reference to Trilinos, PETSc, and a lot of other stuff, and it compiles substantially faster and is substantially smaller. It will of course also have substantially less functionality :-) Best W. -- ------------------------------------------------------------------------ Wolfgang Bangerth email: [email protected] www: http://www.math.colostate.edu/~bangerth/ -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/da5fd530-4055-4593-9c70-6dba1cf72c30n%40googlegroups.com.
