Why Do Ab and Wrk Show Such a Large Difference in Go HTTP Server Testing Results?

Go HTTP Server Testing: Ab vs. wrk -- A Significant Result Disparity

In an attempt to determine the request-handling capacity of a Go HTTP server, two testing tools, ab and wrk, were employed, yielding vastly different results. Ab, which generated approximately 8295 requests per second, stands in stark contrast to wrk's output of 26767 requests per second.

The discrepancy between these tools' findings can be attributed to several factors:

• Benchmarks' Synthetic Nature: Benchmarks tend to present a simplified environment that may not accurately reflect real-world scenarios. As additional complexities are introduced, such as database interactions or template rendering, performance metrics can decline significantly.
• System-Specific Factors: Hardware and software configurations can impact results. For instance, the availability of resources can vary between the development environment and a production server, leading to differences in performance.
• Tool Quality: Ab is generally considered less reliable than wrk, as it operates solely on the HTTP/1.0 protocol and lacks keepalive functionality.
• Test Duration Disparity: The ab test ran for 12 seconds while the wrk test lasted for 5 seconds, introducing a potential bias in the results.
• Denotative Significance of Results: Even a relatively low benchmark result of 8k requests per second translates to a substantial load capacity of 28 million requests per hour. Hence, it is important to contextualize the significance of these figures.

Despite the disparity, both ab and wrk provide valuable insights into a server's performance characteristics. However, it is crucial to consider the limitations of these tools and interpret the results cautiously, mindful of the factors that can influence their accuracy.

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