[SOLVED] We'd like your help - LQ is choosing a CDN

XavierP · 06-29-2009, 02:58 PM

http://images.linuxquestions.org/cdntest/cf.html was fastest for me

win32sux · 06-29-2009, 03:13 PM

Code:

cdnlayer.com (Test 1): 17 files, 34K in 0.3s (134 KB/s)
cdnlayer.com (Test 2): 17 files, 34K in 0.5s (68.2 KB/s)
cdnlayer.com (Test 3): 17 files, 34K in 0.4s (81.6 KB/s)
cdnlayer.com (Test 4): 17 files, 34K in 0.5s (69.8 KB/s)
cdnlayer.com (Test 5): 17 files, 34K in 0.4s (78.6 KB/s)
cdnlayer.com (Average): 0.42s (86.44 KB/s)

cachefly.net (Test 1): 17 files, 34K in 0.3s (109 KB/s)
cachefly.net (Test 2): 17 files, 34K in 0.3s (105 KB/s)
cachefly.net (Test 3): 17 files, 34K in 0.4s (95.9 KB/s)
cachefly.net (Test 4): 17 files, 34K in 0.3s (122 KB/s)
cachefly.net (Test 5): 17 files, 34K in 0.3s (123 KB/s)
cachefly.net (Average): 0.32s (110.98 KB/s)

cloudfront.net (Test 1): 17 files, 34K in 0.4s (90.3 KB/s)
cloudfront.net (Test 2): 17 files, 34K in 0.4s (76.7 KB/s)
cloudfront.net (Test 3): 17 files, 34K in 0.4s (87.4 KB/s)
cloudfront.net (Test 4): 17 files, 34K in 0.4s (90.1 KB/s)
cloudfront.net (Test 5): 17 files, 34K in 0.5s (75.3 KB/s)
cloudfront.net (Average): 0.42s (83.96 KB/s)

linuxquestions.org (Test 1): 17 files, 34K in 0.2s (188 KB/s)
linuxquestions.org (Test 2): 17 files, 34K in 0.2s (152 KB/s)
linuxquestions.org (Test 3): 17 files, 34K in 0.2s (150 KB/s)
linuxquestions.org (Test 4): 17 files, 34K in 0.3s (133 KB/s)
linuxquestions.org (Test 5): 17 files, 34K in 0.2s (150 KB/s)
linuxquestions.org (Average): 0.22s (154.6 KB/s)

ANO1453 · 06-29-2009, 03:48 PM

1.850 -cdnl
0.560 - cf
0.975 -front
1.704 -local

Found using Fasterfox

jlliagre · 06-29-2009, 04:17 PM

Using wget, average times are:
cdnlayer - 2.58s
cachefly - 2.66s
cloudfront - 2.71s
LQ local - 4.79s

jens · 06-29-2009, 04:36 PM

1: 0,04s
2: 0,04s
3: 0,04s
4: 0,30s

GrapefruiTgirl · 06-29-2009, 05:52 PM

Most interesting.. I ENVY you people on high-speed!!!!!!!! Blah!

Well, my very unscientific testing involved the clock in my browser-- remember, I am getting less than 28.8kbps so it was not difficult to time the loads, unlike YOU PEOPLE :finger-pointing: with your fancy high-speed

lol

The 3 links from the CDN places took around 28-29 seconds to load fully, with link #3 once taking up to 34 seconds.
The direct link from LQ took 20 seconds consistently.

I cleared my cache before each test.

Sasha

PS - no bigger images! It'll take me an hour to test.
PPS - And here I thought 'CDN layer' was the 'Canadian layer'

johnsfine · 06-29-2009, 08:25 PM

Trying again from a computer with worse internet access: (using wget -pH)

Quote:

Originally Posted by jeremy

http://images.linuxquestions.org/cdntest/cdnl.html

Downloaded: 17 files, 34K in 0.09s (393 KB/s)

Quote:

http://images.linuxquestions.org/cdntest/cf.html

Downloaded: 17 files, 34K in 0.08s (420 KB/s)
Very strange! That second one had a noticeable pause in the middle, maybe a quarter second, but at the end wget reports the whole thing only took .08s. What am I misunderstanding?

Quote:

http://images.linuxquestions.org/cdntest/front.html

Downloaded: 17 files, 34K in 0.06s (536 KB/s)
This was not just a little faster than the second one! This was instant. wget is lying about the total.

Quote:

http://images.linuxquestions.org/cdntest/local.html

Downloaded: 17 files, 34K in 0.2s (184 KB/s)
This was third best: A little slower than the first, significantly faster than the second. wget was flat out wrong about how long the second was, but the other numbers are all plausible.

Retrying the second (I don't know what caching gets used)
Downloaded: 17 files, 34K in 0.07s (464 KB/s)
That time it was true. It was instant.

Retrying the fourth
Downloaded: 17 files, 34K in 0.2s (210 KB/s)
I guess that's why you want a non local server? The local one didn't get faster on retry.

syg00 · 06-29-2009, 09:00 PM

Seeing as how I've been one who has complained about cdnlayer since the move off cachefly, here are my numbers:
0.4
0.03
0.5
0.4

Orders of magnitude tend to become noticable. Those are wget numbers - I'm getting "400 Bad request" from nginx trying to load the pages in F/F. I'll try later from home.

H_TeXMeX_H · 06-30-2009, 03:18 AM

I wrote a script as a simple benchmark to calculate the average and stdev throughput to each site:

Code:

#!/bin/sh
# benchmark for LQ

iter=10

for site in http://images.linuxquestions.org/cdntest/local.html http://images.linuxquestions.org/cdntest/cdnl.html http://images.linuxquestions.org/cdntest/cf.html http://images.linuxquestions.org/cdntest/front.html http://images.linuxquestions.org/cdntest/scdn.html
do
  for i in $(seq $iter) 
  do
    wget -pH -P out "$site" 2>&1 | grep Downloaded | awk '{ print $7 }' | sed 's|(||' >> $(echo "$site" | cut -d / -f 5)
	rm -rf out
  done
done

for i in *.html
do 
  echo $i
  
  export avg=$(awk '
    BEGIN{sum=0;lines=0}
    {sum+=$1;lines++}
    END{print sum/lines }' $i)
	
  stdev=$(awk '
    BEGIN{sum=0;lines=0}
    {sum+=(ENVIRON["avg"]-$1)*(ENVIRON["avg"]-$1);lines++}
    END{print sqrt(sum/(lines-1))}' $i)

    echo $avg +- $stdev KB/s
done

exit 0

Code:

cdnl.html
165.3 +- 28.3786 KB/s
cf.html
200.6 +- 25.2419 KB/s
front.html
211.5 +- 37.0173 KB/s
local.html
86.63 +- 2.64997 KB/s

Code:

cdnl.html
187.4 +- 23.1478 KB/s
cf.html
209.8 +- 12.7436 KB/s
front.html
196.6 +- 29.7777 KB/s
local.html
87.04 +- 3.26605 KB/s

pwc101 · 06-30-2009, 03:41 AM

Code:

pwc@mike ~ $ bash ./lq_stat.sh
cdnl.html
1.397 +- 0.203909 KB/s
cf.html
56.028 +- 171.807 KB/s
front.html
1.598 +- 0.215603 KB/s
local.html
96 +- 1.25167 KB/s

Nylex · 06-30-2009, 04:55 AM

I'm not measuring the times, but none of them are slow for me. They're all fast enough and there's no noticeable difference between them.

brianL · 06-30-2009, 05:19 AM

I'm not using any precise measuring either. No noticeable difference between cdnl, cf, and front, but local is a bit slower.

H_TeXMeX_H · 06-30-2009, 05:35 AM

But precise measuring is scientific ... you saying you don't wanna be scientific ?

Well, fine, there's no noticeable difference for me between the new sites, but the local one is slow.

alan_ri · 06-30-2009, 07:23 AM

197 ms
425 ms
933 ms
199 ms

Cache clear, ADSL.

archtoad6 · 07-01-2009, 04:12 AM

Houston/TX/USA
ATT "Basic" aDSL resold by local ISP
Using Konqueror 3.5.8
(Is there a timer for Konqueror? -- It's my regular browser for LQ.)
Behind SmoothWall Express 3 FW/Gateway w/ Squid set as transparent caching proxy
Did not clear cache(s)

Subjective ratings: