The siege program is actually quite comprehensive.
Once the siege script is blocked, or fails due to rudimentary security features on networks. It'll come up with a report of the siege.
The siege includes great diagnostics.
Here is an example of one of my runs on the hpa.edu external IP.
Transactions: 1,704,700
Availability: 94.05%
Elapsed Time: 424.33 seconds
Data Transferred: 18.03 GB
Response Time: 2.78 seconds
Transaction Rate: 4017 trans/sec
Throughput: 0.00MB/s
Concurrency: 111.07
Succesful Transactions: 1,704,000
Failed transactions: 700
Longest Transaction: 45.24
Shortest Transaction: 0.27
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