spec.py 19.3 KB
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#!/usr/bin/env python
import os
import platform
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import argparse
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import subprocess
import resource
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import socket
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import sys
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from collections import defaultdict
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from datetime import datetime
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SCRIPT_VERSION="0.1"
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AUTHOR="Andreas Zwinkau <zwinkau@kit.edu>"

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(KERNEL,HOSTNAME,KERNEL_VERSION,VERSION,HOST_ARCH,PROCESSOR) = platform.uname()
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LINUX_NAME, LINUX_VERSION, LINUX_CODENAME = platform.dist()
BITSIZE = {
	"i686": 32,
	"x86_64": 64,
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	"sparc" : 32,
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	"sparc64": 64,
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}.get(HOST_ARCH, "unspecified for "+HOST_ARCH)
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# assert spec dir
for subdir in "benchspec config bin result".split():
	assert os.path.isdir(subdir), "subdir missing: "+subdir
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for filename in "shrc README LICENSE MANIFEST".split():
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	assert os.path.isfile(filename), "file missing: "+filename

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def identify_suite():
	"""Which SPEC suite are we in?"""
	for line in file("README"):
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		possibilities = ["SPEC CPU2000", "SPEC CPU2006", "SPEC CPU2017", "SPEC OMP2001"]
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		for p in possibilities:
			if p in line:
				return p
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	print "Error: Unknown SPEC suite (if at all)"
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	exit(-1)
SPEC_SUITE = identify_suite()

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parser = argparse.ArgumentParser(prog=sys.argv[0], version=SCRIPT_VERSION, usage="Usage: %(prog)s [options] [programs]")
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parser.add_argument("--config-only", action="store_true", default=False,
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		help="Just generate config file, but do not build or run")
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parser.add_argument("--build-only", action="store_true", default=False,
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		help="Just generate config file and build benchmark programs, but do not run")
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parser.add_argument("--no-cpp", action="store_true", default=False,
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		help="Exclude benchmark programs using C++")
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parser.add_argument("--no-fortran", action="store_true", default=False,
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		help="Exclude benchmark programs using Fortran")
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parser.add_argument("--no-floating-point", action="store_true", default=False,
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		help="Exclude CFP subset containing floating point-heavy benchmark programs")
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parser.add_argument("--no-integer", action="store_true", default=False,
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		help="Exclude CINT subset containing integer-heavy benchmark programs")
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parser.add_argument("--no-medium", action="store_true", default=False,
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		help="Exclude OMPM programs")
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parser.add_argument("--no-large", action="store_true", default=False,
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		help="Exclude OMPL programs")
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parser.add_argument("-i", "--iterations", metavar="ITR", default=3,
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		help="Evaluate ITR iterations per program, default=3")
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parser.add_argument("--time-limit", metavar="TIMELIMIT", default=0,
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		help="Set cpu time limit for each program run to TIMELIMIT seconds.")
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parser.add_argument("--submit", metavar="SUBMIT", default=[], action="append",
		help="Start compiled programs with SUBMIT")
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parser.add_argument("--target-architecture", metavar="TARGET_ARCH", default=HOST_ARCH,
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		help="Set target architecture, default=" + HOST_ARCH)
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parser.add_argument("--c-compiler", metavar="CC", default="gcc",
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		help="Use CC to build benchmark programs, default=gcc")
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parser.add_argument("--fortran-compiler", metavar="FC", default="gfortran",
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		help="Use FC to build benchmark programs, default=gfortran")
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parser.add_argument("--cpp-compiler", metavar="CXX", default="g++",
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		help="Use CXX to build benchmark programs, default=g++")

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parser.add_argument("--compiler-args", metavar="FLAGS", default=["-O3"], action="append",
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		help="Append FLAGS to build benchmark programs for all compilers, default=-O3")
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parser.add_argument("--c-compiler-args", metavar="CFLAGS", default=[], action="append",
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		help="Append CFLAGS to build benchmark programs for C compiler, default march=native")
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parser.add_argument("--fortran-compiler-args", metavar="FFLAGS", default=[], action="append",
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		help="Append FFLAGS to build benchmark programs for Fortran compiler, default empty")
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parser.add_argument("--cpp-compiler-args", metavar="CPPFLAGS", default=[], action="append",
		help="Append CPPFLAGS to build benchmark programs for C++ compiler, default march=native")
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parser.add_argument("--force-64", action="store_true", default=False,
		help="Actually produce amd64 code (experimental cparser backend")
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parser.add_argument(dest="benchmarks", metavar="BENCHMARK", nargs="*",
                    help="only run benchmark BENCHMARK")
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class SigKill(Exception):
	def __init__(self, retcode, name):
		self.retcode = retcode
		self.name = name

_EXIT_CODES = {
	-2: "keyboard interrupt",
	-3: "keyboard quit",
	-4: "illegal instruction",
	-6: "aborted",
	-8: "floating point exception",
	-9: "kill",
	-11: "segfault",
	-13: "broken pipe",
	-14: "timeout",
	-15: "termination",
}

def execute(cmd, env=None, timeout=0):
	"""Execute a command and return stderr and/or stdout data"""
	preexec_fn = None
	if timeout > 0.0:
		def set_timeout():
			 resource.setrlimit(resource.RLIMIT_CPU, (timeout, timeout))
		preexec_fn = set_timeout
	cmd = filter(lambda x: x, cmd.split(' '))
	proc = subprocess.Popen(cmd,
							stdout=subprocess.PIPE,
							stderr=subprocess.STDOUT,
							preexec_fn = preexec_fn,
							env=env)
	out, err = proc.communicate()
	try:
		for line in out.splitlines():
			yield line
	except Exception, e:
		print "'%s' -> %s" % (c, e)
	if proc.returncode in _EXIT_CODES:
		raise SigKill(proc.returncode, _EXIT_CODES[proc.returncode])
	elif proc.returncode < 0: # program aborted
		raise Exception(proc.returncode, cmd)

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def path_to_filesystem(path):
	for line in execute("stat -f ."):
		if "Type:" in line:
			i = line.index("Type:")
			return line[i+6:].strip()

def _get_proc_info(path):
	"""Extract data from proc files"""
	data = dict()
	for line in file(path):
		try:
			key, value = line.split(":")
		except ValueError:
			continue
		data[key.strip()] = value.strip()
	return data

def get_mem_info():
	"""Return data about Memory as dict"""
	return _get_proc_info("/proc/meminfo")

def get_cpu_info(): # TODO ignores multiple cpus
	"""Return data about CPU as dict"""
	return _get_proc_info("/proc/cpuinfo")

def get_compiler_version(compiler):
	"""Get the version from a compiler executable"""
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	try:
		d = execute(compiler+" --version")
		for line in d:
			return line
	except OSError:
		return "No compiler '%s' found." % compiler
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# Target architecture-dependent flags
TARGET_ARCH_FLAGS = dict()

i686_flags = dict()
i686_flags["186.crafty"] = "-DLINUX_i386"
i686_flags["253.perlbmk"] = "-DSPEC_CPU2000_LINUX_I386"
i686_flags["400.perlbench"] = "-DSPEC_CPU_LINUX_IA32"
TARGET_ARCH_FLAGS["i686"] = i686_flags

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x86_64_flags = defaultdict(str)
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x86_64_flags["176.gcc"] = "-DSPEC_CPU2000_LP64"
x86_64_flags["186.crafty"] = "-DSPEC_CPU2000_LP64 -DHAS_LONGLONG -DLITTLE_ENDIAN_ARCH -DUNIX -DLINUX"
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x86_64_flags["253.perlbmk"] = "-DSPEC_CPU2000_LP64 -DHAS_LONG_LONG -DSPEC_CPU2000_LINUX_IA64" # LINUX_IA64 should work also for x86_64
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x86_64_flags["254.gap"] = "-DSPEC_CPU2000_LP64"
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x86_64_flags["255.vortex"] = "-DSPEC_CPU2000_LP64"
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x86_64_flags["400.perlbench"] = "-DSPEC_CPU_LINUX_X64"
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for bench in ["400.perlbench", "403.gcc", "436.cactusADM", "453.povray",
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              "481.wrf"]:
    x86_64_flags[bench] += " -DSPEC_CPU_LP64"
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TARGET_ARCH_FLAGS["x86_64"] = x86_64_flags

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sparc_flags = dict()
sparc_flags["176.gcc"] = "-DHOST_WORDS_BIG_ENDIAN"
sparc_flags["186.crafty"] = "-DLINUX_SPARC"
sparc_flags["253.perlbmk"] = "-DSPEC_CPU2000_LINUX_SPARC"
TARGET_ARCH_FLAGS["sparc"] = sparc_flags


# Compiler-dependent flags
COMPILER_FLAGS = dict()
cparser_flags = dict()
cparser_flags["176.gcc"] = "-std=gnu89"
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cparser_flags["403.gcc"] = "-std=gnu89"
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COMPILER_FLAGS["cparser"] = cparser_flags

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clang_flags = dict()
clang_flags["254.gap"] = "-fwrapv"
clang_flags["300.twolf"] = "-Wno-return-type"
COMPILER_FLAGS["clang"] = clang_flags

gcc_flags = dict()
gcc_flags["254.gap"] = "-fwrapv"
COMPILER_FLAGS["gcc"] = gcc_flags

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# Compatibility/SPEC-specific flags, always needed
compat_flags = dict()
compat_flags["176.gcc"] = "-fno-strict-aliasing"
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compat_flags["186.crafty"] = "-DSPEC_CPU2000"
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compat_flags["252.eon"] = "-DHAS_ERRLIST"
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compat_flags["253.perlbmk"] = "-DSPEC_CPU2000_NEED_BOOL -DSPEC_CPU2000_LINUX -DHASATTRIBUTE"
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compat_flags["254.gap"] = "-DSYS_HAS_SIGNAL_PROTO -DSYS_HAS_MALLOC_PROTO -DSYS_HAS_CALLOC_PROTO -DSYS_IS_USG -DSYS_HAS_IOCTL_PROTO -DSYS_HAS_TIME_PROTO"
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compat_flags["400.perlbench"] = "-DPERL_CORE -DSPEC_CPU"
compat_flags["403.gcc"] = "-DSPEC_CPU -DSPEC_CPU_HAVE_BOOL"
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compat_flags["462.libquantum"] = "-DSPEC_CPU_LINUX"
compat_flags["481.wrf"] = "-DSPEC_CPU_CASE_FLAG -DSPEC_CPU_LINUX"
compat_flags["483.xalancbmk"] = "-DSPEC_CPU_LINUX"
# Fortran stuff
compat_flags["187.facerec"] = "-I../src"
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compat_flags["310.wupwise_m"] = "-ffixed-form"
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compat_flags["312.swim_m"] = "-ffixed-form"
compat_flags["314.mgrid_m"] = "-ffixed-form"
compat_flags["316.applu_m"] = "-ffixed-form"
compat_flags["318.galgel_m"] = "-ffixed-form -ffixed-line-length-80"
compat_flags["324.apsi_m"] = "-ffixed-form"
compat_flags["326.gafort_m"] = "-qsuffix=f=f90"
compat_flags["328.fma3d_m"] = "-qsuffix=f=f90"
COMPATIBILITY_FLAGS = compat_flags
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BENCHMARK_PROPERTIES = [
	("SPEC CPU2000", "CINT", "164.gzip", "c"),
	("SPEC CPU2000", "CINT", "175.vpr", "c"),
	("SPEC CPU2000", "CINT", "176.gcc", "c"),
	("SPEC CPU2000", "CINT", "181.mcf", "c"),
	("SPEC CPU2000", "CINT", "186.crafty", "c"),
	("SPEC CPU2000", "CINT", "197.parser", "c"),
	("SPEC CPU2000", "CINT", "252.eon", "cpp"),
	("SPEC CPU2000", "CINT", "253.perlbmk", "c"),
	("SPEC CPU2000", "CINT", "254.gap", "c"),
	("SPEC CPU2000", "CINT", "255.vortex", "c"),
	("SPEC CPU2000", "CINT", "256.bzip2", "c"),
	("SPEC CPU2000", "CINT", "300.twolf", "c"),
	("SPEC CPU2000", "CFP", "168.wupwise", "fortran77"),
	("SPEC CPU2000", "CFP", "171.swim", "fortran77"),
	("SPEC CPU2000", "CFP", "172.mgrid", "fortran77"),
	("SPEC CPU2000", "CFP", "173.applu", "fortran77"),
	("SPEC CPU2000", "CFP", "177.mesa", "c"),
	("SPEC CPU2000", "CFP", "178.galgel", "fortran90"),
	("SPEC CPU2000", "CFP", "179.art", "c"),
	("SPEC CPU2000", "CFP", "183.equake", "c"),
	("SPEC CPU2000", "CFP", "187.facerec", "fortran90"),
	("SPEC CPU2000", "CFP", "188.ammp", "c"),
	("SPEC CPU2000", "CFP", "189.lucas", "fortran90"),
	("SPEC CPU2000", "CFP", "191.fma3d", "fortran90"),
	("SPEC CPU2000", "CFP", "200.sixtrack", "fortran77"),
	("SPEC CPU2000", "CFP", "301.apsi", "fortran77"),
	("SPEC OMP2001", "?", "310.wupwise_m", "?"),
	("SPEC OMP2001", "?", "311.wupwise_l", "?"),
	("SPEC OMP2001", "?", "312.swim_m", "?"),
	("SPEC OMP2001", "?", "313.swim_l", "?"),
	("SPEC OMP2001", "?", "314.mgrid_m", "?"),
	("SPEC OMP2001", "?", "315.mgrid_l", "?"),
	("SPEC OMP2001", "?", "316.applu_m", "?"),
	("SPEC OMP2001", "?", "317.applu_l", "?"),
	("SPEC OMP2001", "?", "318.galgel_m", "?"),
	("SPEC OMP2001", "?", "330.art_m", "?"),
	("SPEC OMP2001", "?", "331.art_l", "?"),
	("SPEC OMP2001", "?", "320.equake_m", "?"),
	("SPEC OMP2001", "?", "321.equake_l", "?"),
	("SPEC OMP2001", "?", "332.ammp_m", "?"),
	("SPEC OMP2001", "?", "328.fma3d_m", "?"),
	("SPEC OMP2001", "?", "329.fma3d_l", "?"),
	("SPEC OMP2001", "?", "324.apsi_m", "?"),
	("SPEC OMP2001", "?", "325.apsi_l", "?"),
	("SPEC OMP2001", "?", "326.gafort_m", "?"),
	("SPEC OMP2001", "?", "327.gafort_l", "?"),
	("SPEC CPU2006", "CINT", "400.perlbench", "c"),
	("SPEC CPU2006", "CINT", "401.bzip2", "c"),
	("SPEC CPU2006", "CINT", "403.gcc", "c"),
	("SPEC CPU2006", "CINT", "429.mcf", "c"),
	("SPEC CPU2006", "CINT", "445.gobmk", "c"),
	("SPEC CPU2006", "CINT", "456.hmmer", "c"),
	("SPEC CPU2006", "CINT", "458.sjeng", "c"),
	("SPEC CPU2006", "CINT", "462.libquantum", "c"),
	("SPEC CPU2006", "CINT", "464.h264ref", "c"),
	("SPEC CPU2006", "CINT", "471.omnetpp", "cpp"),
	("SPEC CPU2006", "CINT", "473.astar", "cpp"),
	("SPEC CPU2006", "CINT", "483.xalancbmk", "cpp"),
	("SPEC CPU2006", "CFP", "410.bwaves", "fortran"),
	("SPEC CPU2006", "CFP", "416.gamess", "fortran"),
	("SPEC CPU2006", "CFP", "433.milc", "c"),
	("SPEC CPU2006", "CFP", "434.zeusmp", "fortran"),
	("SPEC CPU2006", "CFP", "435.gromacs", "c,fortran"),
	("SPEC CPU2006", "CFP", "436.cactusADM", "c,fortran"),
	("SPEC CPU2006", "CFP", "437.leslie3d", "fortran"),
	("SPEC CPU2006", "CFP", "444.namd", "cpp"),
	("SPEC CPU2006", "CFP", "447.dealII", "cpp"),
	("SPEC CPU2006", "CFP", "450.soplex", "cpp"),
	("SPEC CPU2006", "CFP", "453.povray", "cpp"),
	("SPEC CPU2006", "CFP", "454.calculix", "c,fortran"),
	("SPEC CPU2006", "CFP", "459.GemsFDTD", "fortran"),
	("SPEC CPU2006", "CFP", "465.tonto", "fortran"),
	("SPEC CPU2006", "CFP", "470.lbm", "c"),
	("SPEC CPU2006", "CFP", "481.wrf", "c,fortran"),
	("SPEC CPU2006", "CFP", "482.sphinx3", "c"),
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]

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def filter_progs(options,args):
	if args:
		programs = list()
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		for progt in BENCHMARK_PROPERTIES:
			suite, subset, prog, langs = progt
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			if prog in args:
				programs.append(progt)
	else:
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		programs = BENCHMARK_PROPERTIES
	for suite, subset, prog, langs in programs:
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		if suite != SPEC_SUITE:
			continue
		if options.no_cpp and "cpp" in langs:
			continue
		if options.no_fortran and "fortran" in langs:
			continue
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		if options.no_floating_point and subset == "CFP":
			continue
		if options.no_integer and subset == "CINT":
			continue
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		if options.no_medium and prog.endswith("_m"):
			continue
		if options.no_large and prog.endswith("_l"):
			continue
		yield prog

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# http://www.spec.org/cpu2006/Docs/config.html
_CONFIG_HEAD = """\
#### Automatically generated by spec.py script ####

output_format = csv,html,raw,screen,config
ignore_errors = yes
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setprocgroup = yes
ignore_sigint = no
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test_sponsor = IPD Snelting
"""
def get_portability(options, prog, lang):
	if lang == "c":
		port = "CPORTABILITY"
		compiler = os.path.basename(options.c_compiler)
	elif lang == "cpp":
		port = "CXXPORTABILITY"
		compiler = os.path.basename(options.cpp_compiler)
	# Currently no real handling of multi-language benchmarks
	elif "fortran" in lang:
		port = "FPORTABILITY"
		compiler = os.path.basename(options.fortran_compiler)
	else:
		print "Unknown benchmark language: ", lang
		exit(1)

	target_arch = options.target_architecture

	compat_flags = COMPATIBILITY_FLAGS.get(prog, "")

	if not TARGET_ARCH_FLAGS.has_key(target_arch):
		print "No architecture-dependent flags defined for architecture '%s'" % target_arch
		exit(1)
	target_flags = TARGET_ARCH_FLAGS[target_arch].get(prog, "")

	compiler_flags = ""
	for comp in COMPILER_FLAGS:
		if comp in compiler: # Also allow stuff like sparc-leon-linux-gnu-gcc or cparser-test
			compiler_flags = COMPILER_FLAGS[comp].get(prog, "")
			break
	flags = ' '.join(filter(None, [compat_flags, target_flags, compiler_flags]))
	if flags == '':
		return None
	return "%s = %s" % (port, flags)

def check_options(options):
	# Convenience: always compile to 32-bit x86 code with cparser
	target_x86 = options.target_architecture == "i686" or options.target_architecture == "x86_64"
	is_cparser = "cparser" in options.c_compiler
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	if HOST_ARCH == "x86_64" and is_cparser and target_x86 and \
	  not ("-m32" in options.c_compiler_args) and not options.force_64:
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		options.target_architecture = "i686"
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	if options.c_compiler_args == []:
		options.c_compiler_args = ["-march=native"]
	if options.cpp_compiler_args == []:
		options.cpp_compiler_args = ["-march=native"]
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def generate_spec_config(options, progs):
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	"""Generate a config file for SPEC"""
	contents = [_CONFIG_HEAD]
	cpuinfo = get_cpu_info()
	meminfo = get_mem_info()
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	notes = 0
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	if SPEC_SUITE != "SPEC CPU2017":
		contents.append("tester_name = IPD Snelting")
		contents.append("company_name = Karlsruhe Institute of Technology KIT")
	contents.append("prepared_by = spec.py script")
	contents.append("")
	contents.append("## just assuming:")
	if SPEC_SUITE != "SPEC CPU2017":
		contents.append("hw_fpu = Integrated")
	contents.append("sw_state = Multi-user")
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	if options.build_only:
		contents.append("action = build")
	else:
		contents.append("action = validate") # includes run
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	contents.append("runlist = %s" % (" ".join(progs)))
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	contents.append("iterations = %d" % int(options.iterations))
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	if SPEC_SUITE != "SPEC CPU2006":
		contents.append("test_date = %s" % datetime.now())
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	contents.append("")
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	contents.append("sw_os = %s %s %s" % (LINUX_NAME, LINUX_VERSION, LINUX_CODENAME))
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	contents.append("sw_compiler1 = %s" % get_compiler_version(options.c_compiler))
	contents.append("sw_compiler2 = %s" % get_compiler_version(options.cpp_compiler))
	contents.append("sw_compiler3 = %s" % get_compiler_version(options.fortran_compiler))
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	contents.append("sw_file = %s" % path_to_filesystem("."))
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	assert int(BITSIZE), "bitsize is "+BITSIZE
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	contents.append("sw_base_ptrsize = %d-bit" % BITSIZE)
	contents.append("sw_peak_ptrsize = %d-bit" % BITSIZE)
	contents.append("")
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	chips = (1+int(cpuinfo.get("processor", 0)))
	cores_per_chip = int(cpuinfo.get("cpu cores", cpuinfo.get("cpu cores", 1)))
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	cores = cores_per_chip * chips
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	if SPEC_SUITE == "SPEC CPU2006":
		contents.append("hw_cpu_name = %s" % cpuinfo["model name"])
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		contents.append("hw_ncores = %d" % cores)
	elif SPEC_SUITE == "SPEC CPU2000":
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		contents.append("hw_model = %s" % cpuinfo["model name"])
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		contents.append("hw_ncpu = %d" % cores)
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	if SPEC_SUITE != "SPEC CPU2017":
		contents.append("hw_cpu_mhz = %s" % cpuinfo.get("cpu MHz", "?"))
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	contents.append("hw_nchips = %d" % chips)
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	if SPEC_SUITE != "SPEC CPU2017":
		contents.append("hw_ncoresperchip = %d" % cores_per_chip)
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	contents.append("hw_vendor = %s" % cpuinfo.get("vendor_id", "?"))
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	contents.append("hw_memory = %s" % meminfo["MemTotal"])
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	contents.append("hw_pcache = %s" % cpuinfo.get("cache size", "?"))
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	contents.append("")
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	submit = ""
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	time_limit = int(options.time_limit)
	if time_limit != 0:
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		submit = "ulimit -t %d ; " % (time_limit,)
	if options.submit != []:
		submit += " ".join(options.submit) + " "
	if submit != "":
		submit += "$command"
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		contents.append("use_submit_for_speed = 1")
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		contents.append("submit = %s" % submit)
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		contents.append("")
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	contents.append("CC = %s" % options.c_compiler)
	contents.append("CXX = %s" % options.cpp_compiler)
	contents.append("FC = %s" % options.fortran_compiler)
	contents.append("")
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	contents.append("notes%03d = machine: %s" % (notes, socket.getfqdn()))
	notes += 1
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	contents.append("OPTIMIZE = %s" % " ".join(options.compiler_args))
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	contents.append("notes%03d = OPTIMIZE = %s" % (notes, " ".join(options.compiler_args)))
	notes += 1
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	contents.append("COPTIMIZE = %s" % " ".join(options.c_compiler_args))
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	contents.append("notes%03d = COPTIMIZE = %s" % (notes, " ".join(options.c_compiler_args)))
	notes += 1
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	contents.append("CXXOPTIMIZE = %s" % " ".join(options.cpp_compiler_args))
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	contents.append("notes%03d = CXXOPTIMIZE = %s" % (notes, " ".join(options.cpp_compiler_args)))
	notes += 1
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	contents.append("FOPTIMIZE = %s" % " ".join(options.fortran_compiler_args))
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	contents.append("notes%03d = FOPTIMIZE = %s" % (notes, " ".join(options.fortran_compiler_args)))
	notes += 1
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	if HOST_ARCH == "x86_64" and options.target_architecture == "i686":
		contents.append("EXTRA_CFLAGS = -m32")
		contents.append("EXTRA_LDFLAGS = -m32")

	# Enforce big-endian for SPARC
	if options.target_architecture == "sparc":
		contents.append("\nendian = 4321")

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	contents.append("\n\n#### Portability flags ####")
	for (suite, subset, prog, lang) in BENCHMARK_PROPERTIES:
		if prog in progs:
			port = get_portability(options, prog, lang)
			if port is not None:
				contents.append(prog + "=default=default=default:")
				contents.append(port)
				contents.append("notes%03d = %s: %s" % (notes, prog, port))
				notes = notes + 1

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	return "\n".join(contents)

if __name__ == "__main__":
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	options = parser.parse_args()
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	check_options(options)
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	progs = [prog for prog in filter_progs(options, options.benchmarks)]
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	conf = generate_spec_config(options, progs)
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	if options.config_only:
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		sys.stdout.write(conf)
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		exit(0)
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	else:
		fh = open("config/generated.cfg", 'w')
		fh.write(conf)
		fh.close()
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	strprogs = " ".join(progs)
	cmd = "env bash -l -c 'source shrc && runspec %s -c generated'" % strprogs
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	exit(os.system(cmd))