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Diffstat (limited to 'tools/profiling/microbenchmarks/bm_diff')
| -rw-r--r-- | tools/profiling/microbenchmarks/bm_diff/README.md | 116 | ||||
| -rwxr-xr-x | tools/profiling/microbenchmarks/bm_diff/bm_build.py | 75 | ||||
| -rw-r--r-- | tools/profiling/microbenchmarks/bm_diff/bm_constants.py | 29 | ||||
| -rwxr-xr-x | tools/profiling/microbenchmarks/bm_diff/bm_diff.py | 201 | ||||
| -rwxr-xr-x | tools/profiling/microbenchmarks/bm_diff/bm_main.py | 135 | ||||
| -rwxr-xr-x | tools/profiling/microbenchmarks/bm_diff/bm_run.py | 113 | ||||
| -rwxr-xr-x | tools/profiling/microbenchmarks/bm_diff/bm_speedup.py | 59 |
7 files changed, 728 insertions, 0 deletions
diff --git a/tools/profiling/microbenchmarks/bm_diff/README.md b/tools/profiling/microbenchmarks/bm_diff/README.md new file mode 100644 index 0000000000..caa4770229 --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/README.md @@ -0,0 +1,116 @@ +The bm_diff Family +==== + +This family of python scripts can be incredibly useful for fast iteration over +different performance tweaks. The tools allow you to save performance data from +a baseline commit, then quickly compare data from your working branch to that +baseline data to see if you have made any performance wins. + +The tools operate with three concrete steps, which can be invoked separately, +or all together via the driver script, bm_main.py. This readme will describe +the typical workflow for these scripts, then it will include sections on the +details of every script for advanced usage. + +## Normal Workflow + +Let's say you are working on a performance optimization for grpc_error. You have +made some significant changes and want to see some data. From your branch, run +(ensure everything is committed first): + +`tools/profiling/microbenchmarks/bm_diff/bm_main.py -b bm_error -l 5 -d master` + +This will build the `bm_error` binary on your branch, and then it will checkout +master and build it there too. It will then run these benchmarks 5 times each. +Lastly it will compute the statistically significant performance differences +between the two branches. This should show the nice performance wins your +changes have made. + +If you have already invoked bm_main with `-d master`, you should instead use +`-o` for subsequent runs. This allows the script to skip re-building and +re-running the unchanged master branch. For example: + +`tools/profiling/microbenchmarks/bm_diff/bm_main.py -b bm_error -l 5 -o` + +This will only build and run `bm_error` on your branch. It will then compare +the output to the saved runs from master. + +## Advanced Workflow + +If you have a deeper knowledge of these scripts, you can use them to do more +fine tuned benchmark comparisons. For example, you could build, run, and save +the benchmark output from two different base branches. Then you could diff both +of these baselines against your working branch to see how the different metrics +change. The rest of this doc goes over the details of what each of the +individual modules accomplishes. + +## bm_build.py + +This scrips builds the benchmarks. It takes in a name parameter, and will +store the binaries based on that. Both `opt` and `counter` configurations +will be used. The `opt` is used to get cpu_time and real_time, and the +`counters` build is used to track other metrics like allocs, atomic adds, +etc etc etc. + +For example, if you were to invoke (we assume everything is run from the +root of the repo): + +`tools/profiling/microbenchmarks/bm_diff/bm_build.py -b bm_error -n baseline` + +then the microbenchmark binaries will show up under +`bm_diff_baseline/{opt,counters}/bm_error` + +## bm_run.py + +This script runs the benchmarks. It takes a name parameter that must match the +name that was passed to `bm_build.py`. The script then runs the benchmark +multiple times (default is 20, can be toggled via the loops parameter). The +output is saved as `<benchmark name>.<config>.<name>.<loop idx>.json` + +For example, if you were to run: + +`tools/profiling/microbenchmarks/bm_diff/bm_run.py -b bm_error -b baseline -l 5` + +Then an example output file would be `bm_error.opt.baseline.0.json` + +## bm_diff.py + +This script takes in the output from two benchmark runs, computes the diff +between them, and prints any significant improvements or regressions. It takes +in two name parameters, old and new. These must have previously been built and +run. + +For example, assuming you had already built and run a 'baseline' microbenchmark +from master, and then you also built and ran a 'current' microbenchmark from +the branch you were working on, you could invoke: + +`tools/profiling/microbenchmarks/bm_diff/bm_diff.py -b bm_error -o baseline -n current -l 5` + +This would output the percent difference between your branch and master. + +## bm_main.py + +This is the driver script. It uses the previous three modules and does +everything for you. You pass in the benchmarks to be run, the number of loops, +number of CPUs to use, and the commit to compare to. Then the script will: +* Build the benchmarks at head, then checkout the branch to compare to and + build the benchmarks there +* Run both sets of microbenchmarks +* Run bm_diff.py to compare the two, outputs the difference. + +For example, one might run: + +`tools/profiling/microbenchmarks/bm_diff/bm_main.py -b bm_error -l 5 -d master` + +This would compare the current branch's error benchmarks to master. + +This script is invoked by our infrastructure on every PR to protect against +regressions and demonstrate performance wins. + +However, if you are iterating over different performance tweaks quickly, it is +unnecessary to build and run the baseline commit every time. That is why we +provide a different flag in case you are sure that the baseline benchmark has +already been built and run. In that case use the --old flag to pass in the name +of the baseline. This will only build and run the current branch. For example: + +`tools/profiling/microbenchmarks/bm_diff/bm_main.py -b bm_error -l 5 -o old` + diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_build.py b/tools/profiling/microbenchmarks/bm_diff/bm_build.py new file mode 100755 index 0000000000..650ccdc2b2 --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/bm_build.py @@ -0,0 +1,75 @@ +#!/usr/bin/env python2.7 +# +# Copyright 2017 gRPC authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +""" Python utility to build opt and counters benchmarks """ + +import bm_constants + +import argparse +import subprocess +import multiprocessing +import os +import shutil + + +def _args(): + argp = argparse.ArgumentParser(description='Builds microbenchmarks') + argp.add_argument( + '-b', + '--benchmarks', + nargs='+', + choices=bm_constants._AVAILABLE_BENCHMARK_TESTS, + default=bm_constants._AVAILABLE_BENCHMARK_TESTS, + help='Which benchmarks to build') + argp.add_argument( + '-j', + '--jobs', + type=int, + default=multiprocessing.cpu_count(), + help='How many CPUs to dedicate to this task') + argp.add_argument( + '-n', + '--name', + type=str, + help='Unique name of this build. To be used as a handle to pass to the other bm* scripts' + ) + args = argp.parse_args() + assert args.name + return args + + +def _make_cmd(cfg, benchmarks, jobs): + return ['make'] + benchmarks + ['CONFIG=%s' % cfg, '-j', '%d' % jobs] + + +def build(name, benchmarks, jobs): + shutil.rmtree('bm_diff_%s' % name, ignore_errors=True) + subprocess.check_call(['git', 'submodule', 'update']) + try: + subprocess.check_call(_make_cmd('opt', benchmarks, jobs)) + subprocess.check_call(_make_cmd('counters', benchmarks, jobs)) + except subprocess.CalledProcessError, e: + subprocess.check_call(['make', 'clean']) + subprocess.check_call(_make_cmd('opt', benchmarks, jobs)) + subprocess.check_call(_make_cmd('counters', benchmarks, jobs)) + os.rename( + 'bins', + 'bm_diff_%s' % name,) + + +if __name__ == '__main__': + args = _args() + build(args.name, args.benchmarks, args.jobs) diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_constants.py b/tools/profiling/microbenchmarks/bm_diff/bm_constants.py new file mode 100644 index 0000000000..2bbd987b20 --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/bm_constants.py @@ -0,0 +1,29 @@ +#!/usr/bin/env python2.7 +# +# Copyright 2017 gRPC authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +""" Configurable constants for the bm_*.py family """ + +_AVAILABLE_BENCHMARK_TESTS = [ + 'bm_fullstack_unary_ping_pong', 'bm_fullstack_streaming_ping_pong', + 'bm_fullstack_streaming_pump', 'bm_closure', 'bm_cq', 'bm_call_create', + 'bm_error', 'bm_chttp2_hpack', 'bm_chttp2_transport', 'bm_pollset', + 'bm_metadata', 'bm_fullstack_trickle' +] + +_INTERESTING = ('cpu_time', 'real_time', 'locks_per_iteration', + 'allocs_per_iteration', 'writes_per_iteration', + 'atm_cas_per_iteration', 'atm_add_per_iteration', + 'nows_per_iteration',) diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_diff.py b/tools/profiling/microbenchmarks/bm_diff/bm_diff.py new file mode 100755 index 0000000000..881e157ccd --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/bm_diff.py @@ -0,0 +1,201 @@ +#!/usr/bin/env python2.7 +# +# Copyright 2017 gRPC authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +""" Computes the diff between two bm runs and outputs significant results """ + +import bm_constants +import bm_speedup + +import sys +import os + +sys.path.append(os.path.join(os.path.dirname(sys.argv[0]), '..')) +import bm_json + +import json +import tabulate +import argparse +import collections +import subprocess + +verbose = False + + +def _median(ary): + assert (len(ary)) + ary = sorted(ary) + n = len(ary) + if n % 2 == 0: + return (ary[(n - 1) / 2] + ary[(n - 1) / 2 + 1]) / 2.0 + else: + return ary[n / 2] + + +def _args(): + argp = argparse.ArgumentParser( + description='Perform diff on microbenchmarks') + argp.add_argument( + '-t', + '--track', + choices=sorted(bm_constants._INTERESTING), + nargs='+', + default=sorted(bm_constants._INTERESTING), + help='Which metrics to track') + argp.add_argument( + '-b', + '--benchmarks', + nargs='+', + choices=bm_constants._AVAILABLE_BENCHMARK_TESTS, + default=bm_constants._AVAILABLE_BENCHMARK_TESTS, + help='Which benchmarks to run') + argp.add_argument( + '-l', + '--loops', + type=int, + default=20, + help='Number of times to loops the benchmarks. Must match what was passed to bm_run.py' + ) + argp.add_argument('-n', '--new', type=str, help='New benchmark name') + argp.add_argument('-o', '--old', type=str, help='Old benchmark name') + argp.add_argument( + '-v', '--verbose', type=bool, help='Print details of before/after') + args = argp.parse_args() + global verbose + if args.verbose: verbose = True + assert args.new + assert args.old + return args + + +def _maybe_print(str): + if verbose: print str + + +class Benchmark: + + def __init__(self): + self.samples = { + True: collections.defaultdict(list), + False: collections.defaultdict(list) + } + self.final = {} + + def add_sample(self, track, data, new): + for f in track: + if f in data: + self.samples[new][f].append(float(data[f])) + + def process(self, track, new_name, old_name): + for f in sorted(track): + new = self.samples[True][f] + old = self.samples[False][f] + if not new or not old: continue + mdn_diff = abs(_median(new) - _median(old)) + _maybe_print('%s: %s=%r %s=%r mdn_diff=%r' % + (f, new_name, new, old_name, old, mdn_diff)) + s = bm_speedup.speedup(new, old) + if abs(s) > 3 and mdn_diff > 0.5: + self.final[f] = '%+d%%' % s + return self.final.keys() + + def skip(self): + return not self.final + + def row(self, flds): + return [self.final[f] if f in self.final else '' for f in flds] + + +def _read_json(filename, badjson_files, nonexistant_files): + stripped = ".".join(filename.split(".")[:-2]) + try: + with open(filename) as f: + return json.loads(f.read()) + except IOError, e: + if stripped in nonexistant_files: + nonexistant_files[stripped] += 1 + else: + nonexistant_files[stripped] = 1 + return None + except ValueError, e: + if stripped in badjson_files: + badjson_files[stripped] += 1 + else: + badjson_files[stripped] = 1 + return None + + +def diff(bms, loops, track, old, new): + benchmarks = collections.defaultdict(Benchmark) + + badjson_files = {} + nonexistant_files = {} + for bm in bms: + for loop in range(0, loops): + for line in subprocess.check_output( + ['bm_diff_%s/opt/%s' % (old, bm), + '--benchmark_list_tests']).splitlines(): + stripped_line = line.strip().replace("/", "_").replace( + "<", "_").replace(">", "_").replace(", ", "_") + js_new_ctr = _read_json('%s.%s.counters.%s.%d.json' % + (bm, stripped_line, new, loop), + badjson_files, nonexistant_files) + js_new_opt = _read_json('%s.%s.opt.%s.%d.json' % + (bm, stripped_line, new, loop), + badjson_files, nonexistant_files) + js_old_ctr = _read_json('%s.%s.counters.%s.%d.json' % + (bm, stripped_line, old, loop), + badjson_files, nonexistant_files) + js_old_opt = _read_json('%s.%s.opt.%s.%d.json' % + (bm, stripped_line, old, loop), + badjson_files, nonexistant_files) + + if js_new_ctr: + for row in bm_json.expand_json(js_new_ctr, js_new_opt): + name = row['cpp_name'] + if name.endswith('_mean') or name.endswith('_stddev'): + continue + benchmarks[name].add_sample(track, row, True) + if js_old_ctr: + for row in bm_json.expand_json(js_old_ctr, js_old_opt): + name = row['cpp_name'] + if name.endswith('_mean') or name.endswith('_stddev'): + continue + benchmarks[name].add_sample(track, row, False) + + really_interesting = set() + for name, bm in benchmarks.items(): + _maybe_print(name) + really_interesting.update(bm.process(track, new, old)) + fields = [f for f in track if f in really_interesting] + + headers = ['Benchmark'] + fields + rows = [] + for name in sorted(benchmarks.keys()): + if benchmarks[name].skip(): continue + rows.append([name] + benchmarks[name].row(fields)) + note = 'Corrupt JSON data (indicates timeout or crash) = %s' % str( + badjson_files) + note += '\n\nMissing files (new benchmark) = %s' % str(nonexistant_files) + if rows: + return tabulate.tabulate(rows, headers=headers, floatfmt='+.2f'), note + else: + return None, note + + +if __name__ == '__main__': + args = _args() + diff, note = diff(args.benchmarks, args.loops, args.track, args.old, + args.new) + print('%s\n%s' % (note, diff if diff else "No performance differences")) diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_main.py b/tools/profiling/microbenchmarks/bm_diff/bm_main.py new file mode 100755 index 0000000000..0136c6aa57 --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/bm_main.py @@ -0,0 +1,135 @@ +#!/usr/bin/env python2.7 +# +# Copyright 2017 gRPC authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +""" Runs the entire bm_*.py pipeline, and possible comments on the PR """ + +import bm_constants +import bm_build +import bm_run +import bm_diff + +import sys +import os +import argparse +import multiprocessing +import subprocess + +sys.path.append( + os.path.join( + os.path.dirname(sys.argv[0]), '..', '..', 'run_tests', 'python_utils')) +import comment_on_pr + + +def _args(): + argp = argparse.ArgumentParser( + description='Perform diff on microbenchmarks') + argp.add_argument( + '-t', + '--track', + choices=sorted(bm_constants._INTERESTING), + nargs='+', + default=sorted(bm_constants._INTERESTING), + help='Which metrics to track') + argp.add_argument( + '-b', + '--benchmarks', + nargs='+', + choices=bm_constants._AVAILABLE_BENCHMARK_TESTS, + default=bm_constants._AVAILABLE_BENCHMARK_TESTS, + help='Which benchmarks to run') + argp.add_argument( + '-d', + '--diff_base', + type=str, + help='Commit or branch to compare the current one to') + argp.add_argument( + '-o', + '--old', + default='old', + type=str, + help='Name of baseline run to compare to. Ususally just called "old"') + argp.add_argument( + '-r', + '--repetitions', + type=int, + default=1, + help='Number of repetitions to pass to the benchmarks') + argp.add_argument( + '-l', + '--loops', + type=int, + default=20, + help='Number of times to loops the benchmarks. More loops cuts down on noise' + ) + argp.add_argument( + '-j', + '--jobs', + type=int, + default=multiprocessing.cpu_count(), + help='Number of CPUs to use') + args = argp.parse_args() + assert args.diff_base or args.old, "One of diff_base or old must be set!" + if args.loops < 3: + print "WARNING: This run will likely be noisy. Increase loops." + return args + + +def eintr_be_gone(fn): + """Run fn until it doesn't stop because of EINTR""" + + def inner(*args): + while True: + try: + return fn(*args) + except IOError, e: + if e.errno != errno.EINTR: + raise + + return inner + + +def main(args): + + bm_build.build('new', args.benchmarks, args.jobs) + + old = args.old + if args.diff_base: + old = 'old' + where_am_i = subprocess.check_output( + ['git', 'rev-parse', '--abbrev-ref', 'HEAD']).strip() + subprocess.check_call(['git', 'checkout', args.diff_base]) + try: + bm_build.build('old', args.benchmarks, args.jobs) + finally: + subprocess.check_call(['git', 'checkout', where_am_i]) + subprocess.check_call(['git', 'submodule', 'update']) + + bm_run.run('new', args.benchmarks, args.jobs, args.loops, args.repetitions) + bm_run.run(old, args.benchmarks, args.jobs, args.loops, args.repetitions) + + diff, note = bm_diff.diff(args.benchmarks, args.loops, args.track, old, + 'new') + if diff: + text = 'Performance differences noted:\n' + diff + else: + text = 'No significant performance differences' + print('%s\n%s' % (note, text)) + comment_on_pr.comment_on_pr('```\n%s\n\n%s\n```' % (note, text)) + + +if __name__ == '__main__': + args = _args() + main(args) diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_run.py b/tools/profiling/microbenchmarks/bm_diff/bm_run.py new file mode 100755 index 0000000000..3457af916b --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/bm_run.py @@ -0,0 +1,113 @@ +#!/usr/bin/env python2.7 +# +# Copyright 2017 gRPC authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +""" Python utility to run opt and counters benchmarks and save json output """ + +import bm_constants + +import argparse +import subprocess +import multiprocessing +import random +import itertools +import sys +import os + +sys.path.append( + os.path.join( + os.path.dirname(sys.argv[0]), '..', '..', '..', 'run_tests', + 'python_utils')) +import jobset + + +def _args(): + argp = argparse.ArgumentParser(description='Runs microbenchmarks') + argp.add_argument( + '-b', + '--benchmarks', + nargs='+', + choices=bm_constants._AVAILABLE_BENCHMARK_TESTS, + default=bm_constants._AVAILABLE_BENCHMARK_TESTS, + help='Benchmarks to run') + argp.add_argument( + '-j', + '--jobs', + type=int, + default=multiprocessing.cpu_count(), + help='Number of CPUs to use') + argp.add_argument( + '-n', + '--name', + type=str, + help='Unique name of the build to run. Needs to match the handle passed to bm_build.py' + ) + argp.add_argument( + '-r', + '--repetitions', + type=int, + default=1, + help='Number of repetitions to pass to the benchmarks') + argp.add_argument( + '-l', + '--loops', + type=int, + default=20, + help='Number of times to loops the benchmarks. More loops cuts down on noise' + ) + args = argp.parse_args() + assert args.name + if args.loops < 3: + print "WARNING: This run will likely be noisy. Increase loops to at least 3." + return args + + +def _collect_bm_data(bm, cfg, name, reps, idx, loops): + jobs_list = [] + for line in subprocess.check_output( + ['bm_diff_%s/%s/%s' % (name, cfg, bm), + '--benchmark_list_tests']).splitlines(): + stripped_line = line.strip().replace("/", "_").replace( + "<", "_").replace(">", "_").replace(", ", "_") + cmd = [ + 'bm_diff_%s/%s/%s' % (name, cfg, bm), '--benchmark_filter=^%s$' % + line, '--benchmark_out=%s.%s.%s.%s.%d.json' % + (bm, stripped_line, cfg, name, idx), '--benchmark_out_format=json', + '--benchmark_repetitions=%d' % (reps) + ] + jobs_list.append( + jobset.JobSpec( + cmd, + shortname='%s %s %s %s %d/%d' % (bm, line, cfg, name, idx + 1, + loops), + verbose_success=True, + timeout_seconds=60 * 2)) + return jobs_list + + +def run(name, benchmarks, jobs, loops, reps): + jobs_list = [] + for loop in range(0, loops): + for bm in benchmarks: + jobs_list += _collect_bm_data(bm, 'opt', name, reps, loop, loops) + jobs_list += _collect_bm_data(bm, 'counters', name, reps, loop, + loops) + random.shuffle(jobs_list, random.SystemRandom().random) + jobset.run(jobs_list, maxjobs=jobs) + + +if __name__ == '__main__': + args = _args() + run(args.name, args.benchmarks, args.jobs, args.loops, args.repetitions) diff --git a/tools/profiling/microbenchmarks/bm_diff/bm_speedup.py b/tools/profiling/microbenchmarks/bm_diff/bm_speedup.py new file mode 100755 index 0000000000..3d126efa62 --- /dev/null +++ b/tools/profiling/microbenchmarks/bm_diff/bm_speedup.py @@ -0,0 +1,59 @@ +#!/usr/bin/env python2.7 +# +# Copyright 2017 gRPC authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +from scipy import stats +import math + +_THRESHOLD = 1e-10 + + +def scale(a, mul): + return [x * mul for x in a] + + +def cmp(a, b): + return stats.ttest_ind(a, b) + + +def speedup(new, old): + if (len(set(new))) == 1 and new == old: return 0 + s0, p0 = cmp(new, old) + if math.isnan(p0): return 0 + if s0 == 0: return 0 + if p0 > _THRESHOLD: return 0 + if s0 < 0: + pct = 1 + while pct < 101: + sp, pp = cmp(new, scale(old, 1 - pct / 100.0)) + if sp > 0: break + if pp > _THRESHOLD: break + pct += 1 + return -(pct - 1) + else: + pct = 1 + while pct < 100000: + sp, pp = cmp(new, scale(old, 1 + pct / 100.0)) + if sp < 0: break + if pp > _THRESHOLD: break + pct += 1 + return pct - 1 + + +if __name__ == "__main__": + new = [1.0, 1.0, 1.0, 1.0] + old = [2.0, 2.0, 2.0, 2.0] + print speedup(new, old) + print speedup(old, new) |