Created
March 29, 2017 19:56
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import os | |
import io | |
from gzip import GzipFile | |
from urllib.parse import urlparse | |
import requests | |
import boto3 | |
# ~18.4MB compressed | |
URL_BIG = ( | |
"https://s3-us-west-2.amazonaws.com/" | |
"org.mozilla.crash-stats.symbols-public" | |
"/v1/xul.pdb/C017F3ED83534FCE9CAA2057D8BCEE322/xul.sym" | |
) | |
# ~1.2MB compressed | |
URL_SMALL = ( | |
"https://s3-us-west-2.amazonaws.com/" | |
"org.mozilla.crash-stats.symbols-public" | |
"/v1/wntdll.pdb/D74F79EB1F8D4A45ABCD2F476CCABACC2/wntdll.sym" | |
) | |
s3 = boto3.resource('s3', 'us-west-2') | |
def f1(url): | |
r = requests.get(url) | |
return len(r.content) | |
def f2(url): | |
r = requests.get(url, stream=True) | |
buffer = io.BytesIO() | |
for chunk in r.iter_content(chunk_size=512): | |
if chunk: | |
buffer.write(chunk) | |
return len(buffer.getvalue()) | |
def f3(url): # same as f2 but bigger chunk size | |
r = requests.get(url, stream=True) | |
buffer = io.BytesIO() | |
for chunk in r.iter_content(chunk_size=1024): | |
if chunk: | |
buffer.write(chunk) | |
return len(buffer.getvalue()) | |
def f4(url): | |
_, bucket_name, key = urlparse(url).path.split('/', 2) | |
obj = s3.Object( | |
bucket_name=bucket_name, | |
key=key | |
) | |
buffer = io.BytesIO(obj.get()["Body"].read()) | |
try: | |
got_text = GzipFile(None, 'rb', fileobj=buffer).read() | |
except OSError: | |
buffer.seek(0) | |
got_text = buffer.read() | |
return len(got_text) | |
def _stats(r): | |
# returns the median, average and standard deviation of a sequence | |
tot = sum(r) | |
avg = tot/len(r) | |
sdsq = sum([(i-avg)**2 for i in r]) | |
s = list(r) | |
s.sort() | |
return s[len(s)//2], avg, (sdsq/(len(r)-1 or 1))**.5 | |
if __name__ == '__main__': | |
# assert f1(URL_BIG) == 87794590 | |
# assert f1(URL_SMALL) == 1244266 | |
# assert f2(URL_BIG) == 87794590 | |
# assert f2(URL_SMALL) == 1244266 | |
# assert f3(URL_BIG) == 87794590 | |
# assert f3(URL_SMALL) == 1244266 | |
# assert f4(URL_BIG) == 87794590 | |
# assert f4(URL_SMALL) == 1244266 | |
import random | |
import time | |
functions = [f1, f2, f3, f4] | |
results = {} | |
for i in range(3): | |
random.shuffle(functions) | |
for url in URL_BIG, URL_SMALL: | |
for f in functions: | |
key = (f.__name__, os.path.basename(url)) | |
if key not in results: | |
results[key] = [] | |
t0 = time.time() | |
res = f(url) | |
t1 = time.time() | |
# print(key, res, t1 - t0) | |
results[key].append((t1 - t0, res)) | |
for f in sorted(results): | |
times = [x[0] for x in results[f]] | |
med, avg, std = _stats(times) | |
print(f[0], '\t', f[1], '\t', round(med, 3), '\t', round(std, 3)) |
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