> On Jan 3, 2020, at 3:07 PM, Matthew Knepley <knep...@gmail.com> wrote:
>
> On Fri, Jan 3, 2020 at 3:52 PM Smith, Barry F. <bsm...@mcs.anl.gov> wrote:
>
> A long time ago Oana suggested a tool that allowed switching between PETSc
> configurations after pulls etc that didn't require waiting to recompile code
> or rerun configure. Based on her ideas I finally got something that has been
> behaving reasonably satisfactory for me. Note that it is only useful if you
> work with PETSc in a way that you have multiple branches and PETSc arches you
> are dealing with. If you are essentially always in one branch it offers no
> advantages. (Unfortunately since Fortran stubs are stored in the source for
> branch changes that
> change the stubs the will require recompiles). This is my first public
> release so may have glitches. It saves me tons of time.
>
> Barry, I had the same problem, but it went away when I started using ccache
> in front of the compiler for every arch. Does
> this not work for you?
I don't know, never tried it. Still it must "compile" the code (that is
generate all the .o) and rebuild the libraries which takes some time?
Barry
>
> Thanks,
>
> Matt
>
> Put this in your .bashrc file and run source ~/.bashrc Docs are at the
> bottom.
>
> #
> # Utility function used by gitcheckout bash function
> # uses the basename of the branch to build the PETSC_ARCH
> #
> function branchtoarch () {
> basename `echo $1 | sed s?/maint?-maint?g` | sed -e s?/?-?g -e s?^?arch-?g
> }
>
> #
> # Used by the git alias provided below; not used directly
> #
> # Implements a git checkout, but preserves any previously compiled (.o) code
> so it won't unneccessariy get recompiled
> #
> # Sets PETSC_ARCH automatically based on the branch name
> #
> # How it works:
> # 1) before changing from the current PETSC_ARCH branch combination it
> deletes all out-dated .o files for that PETSC_ARCH (using make --dry-run to
> find these)
> # 2) after checking into the new PETSC_ARCH branch combination it updates
> the time-stamps of all remaing .o files for the new PETSC_ARCH so they are
> # more recent than any timestamps on the source files that git may have
> changed (it can do this because it knows from 1) that any out-of-date
> # .o files have already been deleted)
> #
> # Does not change the timestamps or touch in any way the source code, only
> .o files
> #
> function gitcheckout {
> new_branch=$1
> current_branch=`command git rev-parse --abbrev-ref HEAD`
>
> if [ -f ${new_branch} ]; then
> command git checkout ${new_branch}
> return 0
> fi
>
> if [ "${new_branch}" == "-b" ]; then
> command git rev-parse --verify $2 > /dev/null 2>&1
> if [ "$?" == "0" ]; then
> echo "Branch you are trying to create $2 already exists, aborting"
> return 9
> else
> # create the new branch, do not yet check it out
> new_branch=$2
> command git branch ${new_branch}
> fi
> else
> if [ "${current_branch}" == "${new_branch}" ]; then
> echo "Already in branch ${new_branch}"
> return 0
> fi
> changes=`command git status --untracked-files=no --porcelain`
> if [ "${changes}" != "" ]; then
> echo "You have modified or new files; not changing branches"
> echo ${changes}
> return 5
> fi
> fi
>
> current_arch=`branchtoarch ${current_branch}`
> new_arch=`branchtoarch ${new_branch}`
>
> isbranch=0
> command git rev-parse --verify ${new_branch} > /dev/null 2>&1
> if [ "$?" == "0" ]; then
> isbranch=1
> else
> command git rev-parse --verify origin/${new_branch} > /dev/null 2>&1
> if [ "$?" == "0" ]; then
> isbranch=1
> fi
> fi
> if [ "${isbranch}" == "0" ]; then
> echo "Branch ${new_branch} does not exist"
> return 3
> fi
>
> echo "Checking out branch ${new_branch} and PETSC_ARCH ${new_arch}"
>
> if [ "${PETSC_ARCH}" != "${current_arch}" ]; then
> echo "Current PETSC_ARCH ${PETSC_ARCH} not equal to expected value
> ${current_arch} unable to removed out-dated object files"
> else
> # delete all out-dated .o files
> if [[ -f ${PETSC_DIR}/${PETSC_ARCH}/lib/petsc/conf/petscvariables && -d
> ${PETSC_DIR}/${PETSC_ARCH}/obj ]]; then
> pushd ${PETSC_DIR}
> make --dry-run -f gmakefile | sed -n
> 's?[[:print:][:cntrl:]]*-o[[:blank:]]\([-[:alpha:]/]*\.o\)[[:print:][:cntrl:]]*?\1?gp'
> | xargs rm -f
> popd
> fi
> fi
>
> command git checkout ${new_branch}
> if [ "$?" != "0" ]; then
> echo "Unable to checkout branch ${new_branch}"
> return 4
> fi
>
> export PETSC_ARCH=${new_arch}
> # update the timestamps of all .o that remain for this PETSC_ARCH and
> the library
> if [[ -f ${PETSC_DIR}/${PETSC_ARCH}/lib/petsc/conf/petscvariables && -d
> ${PETSC_DIR}/${PETSC_ARCH}/obj ]]; then
> find ${PETSC_DIR}/${PETSC_ARCH}/obj -type f -name *.o -exec touch -m {}
> +
> touch -m ${PETSC_DIR}/${PETSC_ARCH}/lib/libpetsc*
> # /usr/bin/dsymutil libpetsc.3.011.3.dylib
> fi
> }
>
> #
> # An alias for git checkout that manages resetting the PETSC_ARCH to the
> branch name and preserving compiled code associated with the branch checked
> out
> #
> # Oana suggested the idea to save waiting for code to recompile after
> changing branches and the use of touch to force code to not get recompiled
> unnecessarily
> #
> # Usage:
> # git checkout branchname
> #
> # Examples:
> # $ git checkout next
> # Checking out branch next and PETSC_ARCH arch-none
> # Switched to branch 'next'
> # ~/Src/petsc (next<) arch-next
> #
> # $ git checkout master
> # Checking out branch master and PETSC_ARCH arch-master
> # Switched to branch 'master'
> # ~/Src/petsc (master=) arch-master
> #
> # $ git checkout -b barry/mynewbranch
> # Switched to branch 'barry/mynewbranch'
> # ~/Src/petsc (barry/mynewbranch=) arch-mynewbranch
> #
> # Uses the bash function gitcheckout
> #
> function git {
> groot=`command git rev-parse --absolute-git-dir 2> /dev/null`
> if [[ "$1" == "checkout" && "$@" != *"--help"* && "${PETSC_DIR}" != "" &&
> "${PETSC_DIR}/.git" == "${groot}" ]]; then
> shift 1
> if [ "$1" == "git" ]; then
> shift 2
> fi
> gitcheckout "$@"
> else
> command git "$@"
> fi
> }
>
>
>
>
> --
> What most experimenters take for granted before they begin their experiments
> is infinitely more interesting than any results to which their experiments
> lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
