dagrt-fusion.py

def get_example_stepper(actx, dims=2, order=3, use_fusion=True,
                        exec_mapper_factory=ExecutionMapper,
                        return_ic=False):
    sym_operator, discr = get_wave_op_with_discr(
            actx, dims=dims, order=3)

    if not use_fusion:
        bound_op = bind(
                discr, sym_operator,
                exec_mapper_factory=exec_mapper_factory)

        stepper = RK4TimeStepper(
                discr, "w", bound_op, 1 + discr.dim,
                get_wave_component,
                exec_mapper_factory=exec_mapper_factory)

    else:
        stepper = FusedRK4TimeStepper(
                discr, "w", sym_operator, 1 + discr.dim,
                get_wave_component,
                exec_mapper_factory=exec_mapper_factory)

    if return_ic:
        ic = flat_obj_array(discr.zeros(actx),
                [discr.zeros(actx) for i in range(discr.dim)])
        return stepper, ic

    return stepper


def latex_table(table_format, header, rows):
    result = []
    _ = result.append
    _(rf"\begin{{tabular}}{{{table_format}}}")
    _(r"\toprule")
    _(" & ".join(rf"\multicolumn{{1}}{{c}}{{{item}}}" for item in header) + r" \\")
    _(r"\midrule")
    for row in rows:
        _(" & ".join(row) + r" \\")
    _(r"\bottomrule")
    _(r"\end{tabular}")
    return "\n".join(result)


def ascii_table(table_format, header, rows):
    from pytools import Table
    table = Table()
    table.add_row(header)

    for input_row in rows:
        row = []
        for item in input_row:
            if item.startswith(r"\num{"):
                # Strip \num{...} formatting
                row.append(item[5:-1])
            else:
                row.append(item)
        table.add_row(row)

    return str(table)


if not PAPER_OUTPUT:
    table = ascii_table
else:
    table = latex_table


def problem_stats(order=3):
    cl_ctx = cl.create_some_context()
    queue = cl.CommandQueue(cl_ctx)
    actx = PyOpenCLArrayContext(queue)

    with open_output_file("grudge-problem-stats.txt") as outf:
        _, dg_discr_2d = get_wave_op_with_discr(
            actx, dims=2, order=order)
        print("Number of 2D elements:", dg_discr_2d.mesh.nelements, file=outf)
        vol_discr_2d = dg_discr_2d.discr_from_dd("vol")
        dofs_2d = {group.nunit_dofs for group in vol_discr_2d.groups}
        from pytools import one
        print("Number of DOFs per 2D element:", one(dofs_2d), file=outf)

        _, dg_discr_3d = get_wave_op_with_discr(
            actx, dims=3, order=order)
        print("Number of 3D elements:", dg_discr_3d.mesh.nelements, file=outf)
        vol_discr_3d = dg_discr_3d.discr_from_dd("vol")
        dofs_3d = {group.nunit_dofs for group in vol_discr_3d.groups}
        from pytools import one
        print("Number of DOFs per 3D element:", one(dofs_3d), file=outf)

    logger.info("Wrote '%s'", outf.name)


def statement_counts_table():
    cl_ctx = cl.create_some_context()
    queue = cl.CommandQueue(cl_ctx)
    actx = PyOpenCLArrayContext(queue)

    fused_stepper = get_example_stepper(actx, use_fusion=True)
    stepper = get_example_stepper(actx, use_fusion=False)

    with open_output_file("statement-counts.tex") as outf:
        if not PAPER_OUTPUT:
            print("==== Statement Counts ====", file=outf)

        print(table(
            "lr",
            ("Operator", "Grudge Node Count"),
            (
                ("Time integration: baseline",
                 r"\num{%d}"
                     % len(stepper.bound_op.eval_code.instructions)),
                ("Right-hand side: baseline",
                 r"\num{%d}"
                     % len(stepper.grudge_bound_op.eval_code.instructions)),
                ("Inlined operator",
                 r"\num{%d}"
                     % len(fused_stepper.bound_op.eval_code.instructions))
            )),
            file=outf)

    logger.info("Wrote '%s'", outf.name)


@memoize(key=lambda queue, dims: dims)
def mem_ops_results(actx, dims):
    fused_stepper = get_example_stepper(
            actx,
            dims=dims,
            use_fusion=True,
            exec_mapper_factory=ExecutionMapperWithMemOpCounting)

    stepper, ic = get_example_stepper(
            actx,
            dims=dims,
            use_fusion=False,
            exec_mapper_factory=ExecutionMapperWithMemOpCounting,
            return_ic=True)

    t_start = 0
    dt = 0.02
    t_end = 0.02

    result = {}

    for (_, _, profile_data) in stepper.run(
            ic, t_start, dt, t_end, return_profile_data=True):
        pass

    result["nonfused_bytes_read"] = profile_data["bytes_read"]
    result["nonfused_bytes_written"] = profile_data["bytes_written"]
    result["nonfused_bytes_total"] = \
            result["nonfused_bytes_read"] \
            + result["nonfused_bytes_written"]

    result["nonfused_bytes_read_by_scalar_assignments"] = \
            profile_data["bytes_read_by_scalar_assignments"]
    result["nonfused_bytes_written_by_scalar_assignments"] = \
            profile_data["bytes_written_by_scalar_assignments"]
    result["nonfused_bytes_total_by_scalar_assignments"] = \
            result["nonfused_bytes_read_by_scalar_assignments"] \
            + result["nonfused_bytes_written_by_scalar_assignments"]

    for (_, _, profile_data) in fused_stepper.run(
            ic, t_start, dt, t_end, return_profile_data=True):
        pass

    result["fused_bytes_read"] = profile_data["bytes_read"]
    result["fused_bytes_written"] = profile_data["bytes_written"]
    result["fused_bytes_total"] = \
            result["fused_bytes_read"] \
            + result["fused_bytes_written"]

    result["fused_bytes_read_by_scalar_assignments"] = \
            profile_data["bytes_read_by_scalar_assignments"]
    result["fused_bytes_written_by_scalar_assignments"] = \
            profile_data["bytes_written_by_scalar_assignments"]
    result["fused_bytes_total_by_scalar_assignments"] = \
            result["fused_bytes_read_by_scalar_assignments"] \
            + result["fused_bytes_written_by_scalar_assignments"]

    return result


def scalar_assignment_percent_of_total_mem_ops_table():
    cl_ctx = cl.create_some_context()
    queue = cl.CommandQueue(cl_ctx)
    actx = PyOpenCLArrayContext(queue)

    result2d = mem_ops_results(actx, 2)
    result3d = mem_ops_results(actx, 3)

    with open_output_file("scalar-assignments-mem-op-percentage.tex") as outf:
        if not PAPER_OUTPUT:
            print("==== Scalar Assigment % of Total Mem Ops ====", file=outf)

        print(
            table(
                "lr",
                ("Operator",
                 r"\parbox{1in}{\centering \% Memory Ops. "
                 r"Due to Scalar Assignments}"),
                (
                    ("2D: Baseline",
                     "%.1f" % (
                         100 * result2d["nonfused_bytes_total_by_scalar_assignments"]
                         / result2d["nonfused_bytes_total"])),
                    ("2D: Inlined",
                     "%.1f" % (
                         100 * result2d["fused_bytes_total_by_scalar_assignments"]
                         / result2d["fused_bytes_total"])),
                    ("3D: Baseline",
                     "%.1f" % (
                         100 * result3d["nonfused_bytes_total_by_scalar_assignments"]
                         / result3d["nonfused_bytes_total"])),
                    ("3D: Inlined",
                     "%.1f" % (
                         100 * result3d["fused_bytes_total_by_scalar_assignments"]
                         / result3d["fused_bytes_total"])),
                )),
            file=outf)

    logger.info("Wrote '%s'", outf.name)


def scalar_assignment_effect_of_fusion_mem_ops_table():
    cl_ctx = cl.create_some_context()
    queue = cl.CommandQueue(cl_ctx)

    result2d = mem_ops_results(queue, 2)
    result3d = mem_ops_results(queue, 3)

    with open_output_file("scalar-assignments-fusion-impact.tex") as outf:
        if not PAPER_OUTPUT:
            print("==== Scalar Assigment Inlining Impact ====", file=outf)

        print(
            table(
                "lrrrr",
                ("Operator",
                 r"Bytes Read",
                 r"Bytes Written",
                 r"Total",
                 r"\% of Baseline"),
                (
                    ("2D: Baseline",
                     r"\num{%d}" % (
                         result2d["nonfused_bytes_read_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result2d["nonfused_bytes_written_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result2d["nonfused_bytes_total_by_scalar_assignments"]),
                     "100"),
                    ("2D: Inlined",
                     r"\num{%d}" % (
                         result2d["fused_bytes_read_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result2d["fused_bytes_written_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result2d["fused_bytes_total_by_scalar_assignments"]),
                     r"%.1f" % (
                         100 * result2d["fused_bytes_total_by_scalar_assignments"]
                         / result2d["nonfused_bytes_total_by_scalar_assignments"])),
                    ("3D: Baseline",
                     r"\num{%d}" % (
                         result3d["nonfused_bytes_read_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result3d["nonfused_bytes_written_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result3d["nonfused_bytes_total_by_scalar_assignments"]),
                     "100"),
                    ("3D: Inlined",
                     r"\num{%d}" % (
                         result3d["fused_bytes_read_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result3d["fused_bytes_written_by_scalar_assignments"]),
                     r"\num{%d}" % (
                         result3d["fused_bytes_total_by_scalar_assignments"]),
                     r"%.1f" % (
                         100 * result3d["fused_bytes_total_by_scalar_assignments"]
                         / result3d["nonfused_bytes_total_by_scalar_assignments"])),
                )),
            file=outf)
    logger.info("Wrote '%s'", outf.name)

# }}}


def main():
    import sys
    if len(sys.argv) > 1:
        exec(sys.argv[1])
    else:
        if not SKIP_TESTS:
            # Run tests.
            from py.test import main
            result = main([__file__])
            assert result == 0

        # Run examples.
        problem_stats()
        statement_counts_table()
        scalar_assignment_percent_of_total_mem_ops_table()
        scalar_assignment_effect_of_fusion_mem_ops_table()


if __name__ == "__main__":
    main()

# vim: foldmethod=marker