This recipe assumes that you have decided to use your allocation for Stampede2 to run one of your HTCondor jobs. It takes you step by step through the process of Bringing Your Own Capacity (BYOC) in the form of an allocation to an OSG Connect access point and using that resource to run your HTCondor job. In what follows, we refer to the set of resources leased from that allocation as an “annex.”
In this recipe, we assume that the job has not yet been placed at an OSG Connect access point when we begin.
Ingredients
- An OSG Connect account and password
- An HTCondor job submit file (example.submit).
- An allocation for Stampede2.
- Command-line login access to Stampede2
(see TACC’s instructions for gaining access).
We’ll use
LOGIN_NAMEto refer to your login name on Stampede2. - A name for your Stampede2 annex (example). By convention, this is the name of the submit file you want to run, without its extension.
Assumptions
- You want to run the job described above on Stampede2.
- The job described above fits within the capabilities of the Stampede2 partition (queue) you wish to run it on.
Preparation
First, you will need to determine the project ID of your allocation on
Stampede2. If you already know your project ID, you can skip this
section. If not, log in to stampede2.tacc.utexas.edu in a terminal and run the
following command. (Don’t copy the $; in this and other examples
further down the page, the $ just signifies something you type in,
rather than something that the computer prints out.)
$ /usr/local/etc/taccinfo
Choose one of the rows in the top half of the table (there may be only
one row) and remember the entry in the NAME column. For the rest of
these instructions, we’ll use PROJECT_ID where you need to put that
entry.
Instructions
1. Log into the OSG Connect Access Point
Log into an OSG Connect access point (e.g., login04.osgconnect.net or
login05.osgconnect.net) using your OSG Connect account and password.
2. Submit the Job
Submit the job on the access point, indicating that you want it to run
on your own resource (the Stampede2 allocation, in this case) with the
--annex-name option:
$ htcondor job submit example.submit \
--annex-name example
Job 123 was submitted and will run only on the annex 'example'.
Notes on the output of this command:
- 123 is the JOB_ID assigned by the access point to the placed job.
- Placing the job with the annex name specified means that the job won’t run anywhere other than the annex.
- Note that the annex name does not say anything about Stampede2; it is simply a label for the Stampede2 resources we will be provisioning in the next step.
3. Lease the Resources
To run your job on Stampede2, you will need to create an “annex” there;
an annex is a named set of leased resources. The following command will
submit a request to lease an annex named example to the queue named normal
on Stampede2. Project PROJECT_ID will be charged for resources used (by
default, two nodes). The text in bold is emphasized to distinguish
it from XSEDE’s log-in prompt.
$ htcondor annex create example normal@stampede2 --project PROJECT_ID --login-name LOGIN_NAME
This command will access the system named `Stampede 2` via SSH. To proceed, follow the
prompts from that system below; to cancel, hit CTRL-C.
You will need to log into Stampede2 at this prompt.
Thank you.
Requesting annex named 'example' from queue 'normal' on Stampede 2...
The tool will display an indented log of the request progress, because it may take a while. Once the request is done, it will display:
... requested.
It may take some time for Stampede2 to establish the requested annex.
4. Confirm that the Resources are Available
Check on the status of the annex to make sure it has started up correctly.
$ htcondor annex status example
Annex 'example' is not established.
You requested 2 nodes for this annex, of which 0 are in established
annexes.
There are 0 CPUs in the established nodes, of which 0 are busy.
1 jobs must run on this annex, and 0 currently are.
You made 1 resource request(s) for this annex, of which 1 are pending, 0
are established, and 0 have retired.
Give Stampede2 a few more minutes to grant your request and then check again.
$ htcondor annex status example
Annex 'example' is established.
Its oldest established request is about 0.29 hours old and will retire in
0.71 hours.
You requested 2 nodes for this annex, of which 2 are in established
annexes.
There are 136 CPUs in the established nodes, of which 0 are busy.
1 jobs must run on this annex, and 0 currently are.
You made 1 resource request(s) for this annex, of which 0 are pending, 1
are established, and 0 have retired.
5. Confirm Job is Running on the Resources
After some time has passed, check the status of the job to make sure that it started running.
$ htcondor job status 123
Job will only run on your annex named 'example'.
Job has been running for 0 hour(s), 2 minute(s), and 21 second(s).
We want to make sure the job is indeed running on the correct annex resources. There are two different ways we could do this. We could ask the annex itself:
$ htcondor annex status example
Annex 'example' is established.
Its oldest established request is about 0.69 hours old and will retire in
0.31 hours.
You requested 2 nodes for this annex, of which 2 are in established
annexes.
There are 136 CPUs in the established nodes, of which 1 are busy.
1 jobs must run on this annex, and 1 currently are.
You made 1 resource request(s) for this annex, of which 0 are pending,
1 are established, and 0 have retired.
This indicates that the annex is running jobs, but we don’t know for sure that it’s the one we just submitted. Instead, let’s ask the job itself what resources it is running on.
$ htcondor job resources 123
Job is using annex 'example', resource slot1_1@c469-033.stampede2.
tacc.utexas.edu.
6. Terminate the Resource Lease
At this point we know that our job is running on the correct resources, so we can wait for it to finish running. After some time has passed, we ask for its status again:
$ htcondor job status 123
Job is completed.
Now that the job has finished running, we want to shut down the annex. When the annex finishes shutting down, the resource lease will be terminated. We could just wait for the annex time out automatically (after 20 minutes of being idle), but we would rather shut the annex down explicitly to avoid wasting our allocation.
$ htcondor annex shutdown example
Shutting down annex 'example'...
... each resource in 'example' has been commanded to shut down.
It may take some time for each resource to finish shutting down.
Annex requests that are still in progress have not been affected.
At this point our workflow is completed, and our job has run successfully on our allocation.
Reference
You can run either of the following commands for an up-to-date summary of their corresponding options.
$ htcondor job --help
$ htcondor annex --help