OR-Library is a collection of test data sets for a variety of OR problems.
A full list of the test data sets available in OR-Library can be found here.
There are 27 files in this collection which are named as hrs-xx_y(yy).txt, where xx denotes the number of jobs and y(yy) is the value of parameter R which specifies the ratio between the total workload of the secondary machine and the average workload of the primary parallel machines. For example, file hrs-10_025.txt contains data for problem instances with 10 machines and R = 0.25, file hrs-25_1.txt relates to 25 jobs and R = 1 and so on. Each file describes 50 problem instances used for computational experiments described in "Scheduling Reentrant Jobs on Parallel Machines with a Remote Server" by K. Chakhlevitch and C. A. Glass, submitted to the Computers and Operations Research (2008). Each problem instance is described by the number of jobs, the number of machines, and the processing times of three consecutive operations of jobs, namely: - initialization time, the time of the first (initial) operation on a primary machine (constant for all jobs) - setup times, i.e. an array of the times required by the second (setup) operations of jobs which are performed on the secondary machine - processing times, i.e. an array of the times of the third (main processing) operations performed on parallel primary machines
These test problems were contributed by C.A.Glass (email@example.com)
All 27 files are in the single zipped (compressed) file hrs.zip, which is of size 100KB (approximately)
Click here to access this file