Benchmarking HTML parsers (Go vs Java)
3 min read
So, I am working on a web page extractor (something like Instapaper back-end) and I was wondering which language is a better fit for this type of code.
Most of my experience has been with Java, so I am pretty familiar with the language and IDEs and ..., but I have been working with Golang recently and it has been a positive experience.
On one hand we have a very well optimized JVM with excellent GC and on the other hand we have Go with native executables. So, I wrote two sets of code to benchmark performance of each of these when they load and parse a webpage.
The task is to load a number of web pages and parse them as a DOM structure and then search for specific tags within the DOM. This is a simple example of what any web page extractor would need.
In a benchmark, it is not important which hardware/OS environment you run the code. The only important factor is that they should be the same for all the different code you want to compare.
So I started a docker container on my Macbook with 4 CPUs and 8GB RAM. This is not an ideal RAM for high processing tasks like this but as I said, the point is just to "compare" the performances with each other and as long as they both run on the same environment we are fine.
For Java I picked the well known jsoup library. This framework is actively maintained and has ~7900 stars on GitHub. It is well documented and easy to get started with.
For Go, I picked goquery. This one is also pretty active and has 8800 GitHub stars.
To do the benchmark, I prepared a link file with a small number of links to some high traffic websites with lots of links and contents. Below steps are done 10 times for each of Java and Go implementations:
- Call parsing code with each link from the input file (HTML parsing only)
- Call parsing code with each link from the input file + one of "a, div, span, p" selectors (HTML parse + document traverse)
- Time each execution and log it to the output (language, url, selector, result, time taken).
All of the source code (Go and Java implementations + scripts used to do the benchmarking) are available here
900 executions were made during the benchmark (450 for each language).
- Average execution time for Golang across all 450 executions was 235 milliseconds.
- This number was 921 milliseconds for the Java implementation.
So, Go was about 4x faster than Java on average, which is impressive!