Compile Linux version for PFGW

[nordi]

@paulunderwood: I worked around the -lgcc_s problem you had. Remove the " -Wl,-no_pie" option from the makefile. It seems "ld" only has "-pie", not "-no_pie".

[nordi]

I have a pretty well-automated version now: To build PFGW with Docker, get and extract the sources of PFGW. In the directory with the sources, create a Dockerfile with this content:

FROM gcc
RUN apt-get update && apt-get install -y libgmp-dev wget unzip

RUN mkdir /usr/src/mprime && \
    cd /usr/src/mprime && \ 
    # openpfgw insists on version 28.6
    wget -O mprime.zip --quiet https://www.mersenne.org/ftp_root/gimps/p95v286.source.zip && \
    # unzip produces some warnings and therefore has exit code 1.
    unzip mprime.zip ; \
    rm mprime.zip
RUN cd /usr/src/mprime/gwnum && \
    make -j -f make64

COPY . /usr/src/openpfgw
WORKDIR /usr/src/openpfgw
RUN cp /usr/lib/x86_64-linux-gnu/libgmp.a packages/gmp/64bit/
RUN cp /usr/src/mprime/gwnum/gwnum.a packages/gwnum/64bit/gwnum.a
RUN sed -i 's/-Wl,-no_pie//g' makefile

RUN make -j

Run "docker build -t pfgw ." (mind the dot at the end) to build a new image. Then "docker run -it pfgw" to start a container with that image. The executable is at /usr/src/openpfgw/pfgw64 and it actually works.

This assumes "#include <ctype.h>" fix to PFGW is already applied.

[paulunderwood]

Thanks for the tips, nordi

Incidentally, I added gwset_num_threads ( &gwdata, 4 ); to every line with gwinit2(&gwdata, sizeof(gwhandle), (char *) GWNUM_VERSION); and got a multi-threaded PFGW working at 300% on my Haswell 4770k. Good for speedy proofs, but not so good for overall number-crunching throughput

[henryzz]

Originally Posted by paulunderwood

Thanks for the tips, nordi

Incidentally, I added gwset_num_threads ( &gwdata, 4 ); to every line with gwinit2(&gwdata, sizeof(gwhandle), (char *) GWNUM_VERSION); and got a multi-threaded PFGW working at 300% on my Haswell 4770k. Good for speedy proofs, but not so good for overall number-crunching throughput

It is more efficient the larger the FFT. There would be people using it if this feature was added to the main source. Please do rouge.
A larger fft can fit in the L3 cache with 1x4threads than 4x1threads