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Drupal 8 Performance Test

This is a link to a blog post to perform a performance test Drupal 8 written by Darrell Ulm with Drush and the Drupal site_audit module from May of 2016 .

So the basic idea is in Drupal 8 the same Drush utility, site_audit, can be used to figure out all kinds of things how your install is working. We can check for best practices, caching, unused content types, and stats on the database.  We can also look at what modules are installed, a security overview, users, views, and Drupal Watchdog entries.

This is a pretty useful module, and much or more of the reporting is likely available for the major Drupal hosting platforms.

It's safe to say than using this module for most any Drupal site is a good idea to profile the site for any issues, performance, or otherwise, virtually an auto-include.

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Apache Spark Knapsack Approximation Algorithm in Python

The code shown below computes an approximation algorithm, greedy heuristic, for the 0-1 knapsack problem in Apache Spark. Having worked with parallel dynamic programming algorithms a good amount, wanted to see what this would look like in Spark.

The Github code repo. for the Knapsack approximation algorithms is here, and it includes a Scala solution. The work on a Java version is in progress at time of this writing.

Below we have the code that computes the solution that fits within the knapsack W for a set of items each with it's own weight and profit value. We look to maximize the final sum of selected items profits while not exceeding the total possible weight, W.

First we import some spark libraries into Python.

# Knapsack 0-1 function weights, values and size-capacity. from pyspark.sql import SparkSession from pyspark.sql.functions import lit from pyspark.sql.functions import col from pyspark.sql.functions import sum
Now define the function, which will take a Spark Dataframe w…