Network Characterization Tests

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Bandwidth testing: All tests are an average of five runs

File Size used: 260 MBytes


Local to Local Tests

umich-umich (MBytes/second) (Depot was configured to receive max 64 threads. The figure values increase to the 90's once we reconfigure depot with 120 threads)


  • Umich-Umich (MBytes/second)
1 Thread 70.652
10 Threads 82.114
20 Threads 82.582
40 Threads 85.216
60 Threads 81.658
100 Threads 75.644



  • caltech-caltech (MBytes/second)
1 Thread 81.321
10 Threads 100.08
20 Threads 99.690
40 Threads 99.160
60 Threads 98.820
100 Threads 97.260



  • Fermi-Fermi (MBytes/second)
1 Threads 74.200
10 Threads 95.870
20 Threads 95.553
40 Threads 93.290
60 Threads 91.872
100 Threads 90.940


Over the Network Tests

  • UMich to Fermi
1 Thread 8.580 MB/s
10 Threads 66.290 MB/s
20 Threads 68.820 MB/s
40 Threads 66.84 MB/s
60 Threads 67.45 MB/s
100 Threads 66.81 MB/s



  • Umich to Fermi to 4 depots
10 Threads 69.22 MB/s
20 Threads 68.89 MB/s
40 Threads 68.24 MB/s

These numbers probably are limitations on the lors_upload ability to pump out data: 1 or 4 target depots see same throughput.



  • Fermi to Caltech
1 Thread 0.83MB/s
10 Threads 7.04MB/s
20 Threads 6.95 MB/s
40 Threads 7.06 MB/s


  • UMich to Caltech
1 Thread .75 MB/s
10 Threads 6.37 MB/s
20 Threads 6.35 MB/s
40 Threads 6.40 MB/s


Large file transfer...1.7GB (Only doing this on relatively fast sites)

  • Umich to Fermi
1 Thread 8.74 MB/s
10 Threads 49.46 MB/s
20 Threads 49.43 MB/s
40 Threads 49.4 MB/s




Capricorn Test

  • Capricorn-ibp.accre
1 Thread 24.89 MB/s
10 Threads 28.63 MB/s
20 Threads 28.44 MB/s
40 Threads 26.74 MB/s
60 Threads 27.51 MB/s
100 Threads 27.37 MB/s

iperf testing between caltech and michigan

  • caltech-depot01.ultralight.org to umich-depot01.ultralight.org
1 Thread 0.93 MB/s
10 Threads 10.4 MB/s
20 Threads 21.0 MB/s
40 Threads 42.4 MB/s
60 Threads 63.4 MB/s
100 Threads 105.0 MB/s

  • umich-depot01.ultralight.org to caltech-depot01.ultralight.org
1 Thread 0.93, 0.94 MB/s
10 Threads 10.3, 10.7 MB/s
20 Threads 20.8, 20.9, 20.6 MB/s
40 Threads 11.4, 28.7, 7.02, 20.4 * MB/s
60 Threads 10.4, 35.3, 11.6, 43.5 ** MB/s
100 Threads 58.4, 23.8, 14.1, 22.4 ** MB/s
This table shows results of individual trials rather than an average to the show 
behavior of this connection.

* = Erratic iperf results, some of the threads die before the test completes, 
    bandwidth varies greatly from trial to trial.
** = Same as above plus the test fails to complete some of the time.

Vandy Caltech client (ultralight) IBP depot (Non-Ultralight) Test Results

  • Vandy Ultralight-caltech-depot01
1 Thread 0.78 MB/s
10 Threads 6.51 MB/s
20 Threads 6.61 MB/s
40 Threads 6.69 MB/s
60 Threads 6.48 MB/s
100 Threads 6.62 MB/s


Vandy Caltech Ultralight Test Results

  • Vandy Ultralight-caltech-depot02
1 Thread 0.72 MB/s
10 Threads 6.37 MB/s
20 Threads 6.34 MB/s
40 Threads 6.44 MB/s
60 Threads 6.49 MB/s
100 Threads 4.40 MB/s


Vandy Caltech Ultralight Test Results

  • Vandy Non-Ultralight-caltech-depot02 (IBP depot with ultralight kernel on it)
1 Thread 0.77 MB/s
10 Threads 6.51 MB/s
20 Threads 6.62 MB/s
40 Threads 6.69 MB/s
60 Threads 6.67 MB/s
100 Threads 6.51 MB/s


Vandy Caltech client (non-ultralight) IBP Depot (non-Ultralight) Test Results

  • Vandy Non-Ultralight-caltech-depot01 (non ultralight IBP depot)
1 Thread 0.78 MB/s
10 Threads 6.58 MB/s
20 Threads 6.72 MB/s
40 Threads 6.69 MB/s
60 Threads 6.63 MB/s
100 Threads 6.49 MB/s