Measuring the Maximum Throughput
of a Download Server


In this test we are trying to find the maximum bandwidth a web server can serve.

We run a ramp test with up to 100 users. Each of them downloads an 8 megabyte ZIP file every 2 seconds.

In the graph we can see that the server's bandwidth (blue line) rises until it reaches 900 Mbit/s (for 30 users) and stays at this value regardless of how many users try to download the file. So 900-950 Mbit/s seems to be the maximum throughput for the server, which was the expected value in a gigabit LAN

When we look at the red line we can see that while we were running the test with only a few users, each users was able to get up to 800 Mbit/s of bandwidth for itself while later in the test the users must share the server's bandwidth and fall to 50kbit/s and less. Again, this behavior is expected for a web  server.

 Test Results

Test Type

RAMP (number of users increases during the test time)

Number of Users

100

Click Delay

2 sec.

Tested Web Server

DELL Optiplex 7010, one cpu, 4 cores, Intel Core i5-3550S @ 3 Ghz, 8 GB RAM, Windows 7

Test Client

DELL R710 Server with two cpus, 24 cores, Intel Xeon X5650 @2.67 Ghz, 128 GB RAM, Windows 2008 R2 (running Webserver Stress Tool)

 

 

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