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September 24, 2008: http, https and scp tests from
dumbo and port (.duke-nus.edu.sg) The idea was to compare the download responses over ports 22, 80 and 443. The overall result was that http did not stall (5 attempts), while https and scp stalled > 50% of the time. Peak download rates ranged from 800 KB/s to 1.4 MB/s. Testing within the NUS network. I downloaded from dumbo to garfield and frank, both behind the Duke-NUS firewall. All downloads succeeded. This suggests that the server is capable of downloading at >2 MB/s files to targets within the NUS network. HTTPS downloads from dumbo.duke-nus.edu.sg
For https - 5 attempts, 3 stalls and 2 successes. The average download rate was 800 KB/s Note that the stalls all occurred early during the transfer. [cfs@queens ~]$ wget --no-check-certificate "https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:50:10-- https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.1' 1% [ ] 524,288 663K/s STALL [cfs@queens ~]$ wget --no-check-certificate "https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:50:29-- https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.2' 0% [ ] 425,984 1005K/s STALL cfs@queens ~]$ wget --no-check-certificate "https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:50:38-- https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.3' 100%[======================================>] 45,809,112 752K/s in 59s 2008-09-24 05:51:37 (754 KB/s) - `gms_downloadtest.pdf.3' saved [45809112/45809112] [cfs@queens ~]$ wget --no-check-certificate "https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:51:54-- https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.4' 100%[======================================>] 45,809,112 809K/s in 56s 2008-09-24 05:52:50 (801 KB/s) - `gms_downloadtest.pdf.4' saved [45809112/45809112] [cfs@queens ~]$ wget --no-check-certificate "https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:53:48-- https://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.5' 1% [ ] 557,056 413K/s (STALL) HTTP downloads from dumbo.duke-nus.edu.sg For http - 5 attempts 5 successes. Average download rate was 1.2 MB/s
[cfs@queens ~]$ wget "http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:54:18-- http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf Resolving dumbo.duke-nus.edu.sg... 137.132.155.240 Connecting to dumbo.duke-nus.edu.sg|137.132.155.240|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.6' 100%[======================================>] 45,809,112 1.16M/s in 53s 2008-09-24 05:55:11 (841 KB/s) - `gms_downloadtest.pdf.6' saved [45809112/45809112] [cfs@queens ~]$ wget "http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:55:14-- http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf Resolving dumbo.duke-nus.edu.sg... 137.132.155.240 Connecting to dumbo.duke-nus.edu.sg|137.132.155.240|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.7' 100%[======================================>] 45,809,112 1.35M/s in 32s 2008-09-24 05:55:47 (1.34 MB/s) - `gms_downloadtest.pdf.7' saved [45809112/45809112] [cfs@queens ~]$ wget "http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:55:49-- http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf Resolving dumbo.duke-nus.edu.sg... 137.132.155.240 Connecting to dumbo.duke-nus.edu.sg|137.132.155.240|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.8' 100%[======================================>] 45,809,112 1.37M/s in 32s 2008-09-24 05:56:21 (1.37 MB/s) - `gms_downloadtest.pdf.8' saved [45809112/45809112] [cfs@queens ~]$ wget "http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:57:20-- http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf Resolving dumbo.duke-nus.edu.sg... 137.132.155.240 Connecting to dumbo.duke-nus.edu.sg|137.132.155.240|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.9' 100%[======================================>] 45,809,112 1.29M/s in 34s 2008-09-24 05:57:54 (1.30 MB/s) - `gms_downloadtest.pdf.9' saved [45809112/45809112] [cfs@queens ~]$ wget "http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf" --2008-09-24 05:58:36-- http://dumbo.duke-nus.edu.sg/gms_downloadtest.pdf Resolving dumbo.duke-nus.edu.sg... 137.132.155.240 Connecting to dumbo.duke-nus.edu.sg|137.132.155.240|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 45809112 (44M) [application/pdf] Saving to: `gms_downloadtest.pdf.10' 100%[======================================>] 45,809,112 1.40M/s in 32s 2008-09-24 05:59:08 (1.37 MB/s) - `gms_downloadtest.pdf.10' saved [45809112/45809112] SCP downloads from dumbo.duke-nus.edu.sg For scp - 5 attempts: 3 stalls and 2 successes. Average download rate 800KB/s. Note that the stalls all occur early during the transfer 2008-09-24 05:59:08 [cfs@queens ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 844.1KB/s 783.5KB/s 00:53 Max throughput: 1.2MB/s [cfs@queens ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 1% 496KB 35.6KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 1% 496KB 28.8KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 813.4KB/s 143.5KB/s 00:55 Max throughput: 1.0MB/s [cfs@queens ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 1% 560KB 23.7KB/s 0.0KB/s - stalled - SCP downloads from port.duke-nus.edu.sg (inside Duke-NUS firewall) Here are the results from my desktop system (port.duke-nus.edu.sg) to queens: 9 attempts, 6 stalls. Note all stalls occur early during the transfers. Ave xfer rate 800 KB/s with peak to 1.4 MB/s (probably maxes out my maxonline from Starhub
[cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 894.7KB/s 431.5KB/s 00:50 Max throughput: 1.4MB/s [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 1% 560KB 40.2KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 2% 1264KB 39.1KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 0% 144KB 24.0KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 994.1KB/s 431.5KB/s 00:45 Max throughput: 1.5MB/s [cfs@queens ~]$ date Wed Sep 24 06:22:55 SGT 2008 [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 951.8KB/s 207.5KB/s 00:47 Max throughput: 1.5MB/s [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 1% 528KB 88.1KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 1% 560KB 84.1KB/s 0.0KB/s - stalled - [cfs@queens ~]$ [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 0% 272KB 76.8KB/s 0.0KB/s - stalled - [cfs@queens ~]$ scp port.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 813.4KB/s 975.5KB/s 00:55 Max throughput: 1.4MB/s These tests indicate that there are no stalls within the NUS network. Here from dumbo to port.duke-nus.edu.sg SCP downloads from dumbo.duke-nus.edu.sg to port.duke-nus.edu.sg
Wed Sep 24 13:06:00 SGT 2008 [cfs@frank from_dumbo]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@frank from_dumbo]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.3MB/s 00:19 [cfs@frank from_dumbo]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@frank from_dumbo]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@frank from_dumbo]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@frank from_dumbo]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.3MB/s 00:19 SCP downloads from dumbo.duke-nus.edu.sg to garfield.duke-nus.edu.sg
[cfs@garfield ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@garfield ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@garfield ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@garfield ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.2MB/s 00:20 [cfs@garfield ~]$ scp dumbo.duke-nus.edu.sg:/home/cfs/gms_downloadtest.pdf . gms_downloadtest.pdf 100% 44MB 2.3MB/s 00:19 |