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Scaling Up Exercise 2.1: Log Into a Local Pool

Introduction

So far, all of our HTC exercises (and your workloads) have used the Open Science Pool, accessed through the ap40 Access Point. But what if you had access to another computing resource also? In this section of exercises, we will explore similarities and differences between the OSPool, and a campus-focused high throughput computing system operated by the Center for High Throughput Computing.

Log In

The CHTC Access Point we will be using is called ap2003.chtc.wisc.edu. You should be able to log into this computer with the same username and login steps as for ap40.uw.osg-htc.org.

Initial Exploration

In the following exercises, we will explore the differences between the OSPool and the CHTC pool more deeply. But to start, let's run a few commands to compare.

What's in the pool?

  1. Log into ap2003.chtc.wisc.edu.
  2. Run these commands: console [username@ap2003 ~]$ condor_status | tail [username@ap2003 ~]$ condor_status -compact | tail -n 15
  3. How many "slots" are in the pool? How many of each operating system?
  4. In a separate window, log into ap40.uw.osg-htc.org and run the same commands.
  5. How many "slots" are in the OSPool? How many of each operating system?

Jobs in the queue

  1. On ap2003.chtc.wisc.edu run condor_q -all.
  2. On ap40.uw.osg-htc.org, run the same command.
  3. How many jobs are on ap40 compared to ap2003?