Measuring total download speed from EOS by grid jobs

<!--HTML-->Root protocol is a standard way to access data from EOS in a grid environment. The performance of storage is crucial for the effective use of computing resources. One of the questions that could be asked by a person who sends jobs to the grid is the following: how many jobs may simultaneously download data from storage and still be effective? In order to answer this question, a simple test was created in JINR. The idea is the following: send 100-200 jobs, wait until all of them are in the running state, initiate file download from EOS, estimate how much time did it take to download all the data in all jobs. It is a purely functional test that gives understanding about the real performance of a storage element. The tests were performed in JINR: EOS was used as a storage element, local CE was used to run jobs, DIRAC was used as a workload management system, DIRAC standard utilities were used to initiate transfers.