On 30 April 2020 at 18:16, Sébastien Villemot wrote: | Le jeudi 30 avril 2020 à 10:43 -0500, Dirk Eddelbuettel a écrit : | > On the r-sig-debian list (hosted by the R Project for users of R on Debian | > and Ubuntu) someone pointed out that R hangs on simple calls into OpenBLAS | > Pthread, i.e. /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3 | > | > To witness, just launch R and issue the example(solve) which spends two | > lines setting a helper Hilbert function and input data with it and then hangs | > on the actual call to solve() (see below for full example) | > | > Is this a known issue? Do we need to set some OpenMP env vars to limit thread | > use? | | The problem was there in the past but was solved. I don’t know why it | is happening again. See | https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=739331 | | Also note that (in unstable/testing) there are now OpenMP and single- | threaded flavours of OpenBLAS (in packages libopenblas0-openmp and | libopenblas0-serial). As a workaround, you can try to install one of | these two (and adjust the BLAS alternatives accordingly).
Switching to libopenblas0-openmp works but one needs to uninstall libopenblas0-pthread (or else fiddle with the alternatives priority). Dirk -- http://dirk.eddelbuettel.com | @eddelbuettel | [email protected]
