You can use HTCondor to run the nextnano software on your local computer infrastructure (“on-premise”). Essentially, the nextnanomat software submits the job either locally or on the “HTCondor” cluster. In both cases, the results of the calculations are located on your local computer.

This feature is only supported with our new license system.

The following shows a screenshot. 6 computers are connected to the HTCondor pool called e25nn. 120 slots are configured, 44 are currently available. Computers 2, 3, 4 and 6 are selected to accept jobs. Computers 2 and 6 are currently not available as they are in use.

Download HTCondor installer from HTCondor.

1. In the webpage, click on Download and go to Current Stable Release of UW Madison (as of September 24 2020, HTCondor 8.8.10).
2. We recommend the file for Windows in Native Packages. The filenames look similar to this one:
   • condor-8.8.10-513586-Windows-x64.msi (Version 8.8.10)
3. Select the file, agree to the license agreement and download the .msi file. When you download it, you can optionally enter your name, email address and institution and subscribe to the HTCondor newsletter.

Install HTCondor.

1. Start installer
2. Click Next and then accept License Agreement
3. Then there are two options. There will be one special computer that manages all HTCondor jobs (Central Manager), and normal computers. If there is no Central Manager yet, we have to create a New Pool.
   1. If you are on the Central Manager, choose Create a new HTCondor Pool and fill in the name of the Pool, e.g. nextnanoHTCondorPool. This is a unique name for your pool of machines.
   2. If you are not the Central Manager, choose Join an existing HTCondor Pool and fill in the hostname of the central manager, e.g. computername where nextnanoHTCondorPool has been created.
4. Tic Submit jobs to HTCondorPool and choose Always run jobs and never suspend them. (Alternative: If you do not want other people to run jobs on your machine at all, select Do not run jobs on this machine or if you do not want other people to run jobs on your machine while you are working, select When keyboard has been idle for 15 minutes.. You can of course modify these settings later.)
5. Fill in your domain name (Example: Your Windows domain, e.g. yourcompanyname.com (without www).) All PCs of your network should get the same domain name, this does not necessarily have to be your Windows domain.
6. Hostname of SMTP Server and email address of administrator (not needed currently, leave it blank)
7. Path to Java Virtual Machine (not needed currently, leave it blank)
8. Host with Read access: *
9. Host with Write access: $(CONDOR_HOST), $(IP_ADDRESS), *.yourdomainname.com, 192.168.178.*, (Replace *.cs.wisc.edu with your domain name and add your local IP subnet e.g. 192.168.178.*). On Windows you can find your IP subnet by opening the Command Prompt cmd.exe and typing in ipconfig.
10. Host with Administrator access * (or $(IP_ADDRESS))
11. Enable VM Universe No
12. Choose an installation directory and press next (e.g. C:\condor\). The directory Program Files is problematic due to write permissions, so we do not recommend using it.
13. Press Install and type in the Administrator password of your PC. (You need Administrator rights.)
14. Once installed, please restart the computer. Then your new pool or pool member should be up and running.

A few more setups

1. To be able to submit jobs from nextnanomat to HTCondor, you have to store your credentials once. Open a command shell and type the following command: condor_store_cred add
   • Enter your password and you are ready to submit your first HTCondor job.
   • If this does not work, try to enter condor_store_cred add -debug for more output information on the error.
2. Please make sure that nextnanomat has successfully found the HTCondor pool. In nextnanomat go to Tools → Options → Cloud computing. If everything is correctly set up, you will find the “HTCondor” section highlighted with green color, and the available computers show up in “Cluster”. If this is not the case, maybe you have not installed HTCondor on the computer where you are running nextnanomat. Please also check that the HTCondor installation path is correctly set within nextnanomat, e.g. the default path C:\condor might not be the one where you installed HTCondor.

Hostname (for HTCondor pool): computername.yourcompanyname.com
Policy: "Always run jobs"
Accounting domain: yourcompanyname.com
Read access: *
Write access: $(CONDOR_HOST), $(IP_ADDRESS), *.yourcompanyname.com, 192.168.178.*
Administrator: $(IP_ADDRESS)

You can find your HTCondor config settings in the file C:\condor\condor_config. Let's look at an example below.

• Your company is called Simpson.
• Your Windows domain is called simpson.com.
• Your HTCondor pool shall have the name TheSimpsonsCondorPool.
• The HTCondor host that manages the HTCondor jobs has the computer name homer.simpson.com.
• Your computer is called lisa.simpson.com.
• The computers in your network have the IP range 192.168.188.*. (or 2001:db8:2042::* in IPv6)

 RELEASE_DIR = C:\condor
 LOCAL_CONFIG_FILE = $(LOCAL_DIR)\condor_config.local
 REQUIRE_LOCAL_CONFIG_FILE = FALSE
 LOCAL_CONFIG_DIR = $(LOCAL_DIR)\config
 use SECURITY : HOST_BASED
#CONDOR_HOST: $(FULL_HOSTNAME)          # on computer called homer
 CONDOR_HOST: homer                      # on computer called lisa
 COLLECTOR_NAME = TheSimpsonsCondorPool  # only on computer called homer
#UID_DOMAIN =                           # empty if you do not have a domain
 UID_DOMAIN = simpson.com
 SOFT_UID_DOMAIN=TRUE             # entry is missing if you do not have a domain
 FILESYSTEM_DOMAIN = simpson.com  # entry is missing if you do not have a domain
 CONDOR_ADMIN = 
 SMTP_SERVER = 
 ALLOW_READ = *
 ALLOW_WRITE = $(CONDOR_HOST), $(IP_ADDRESS), *.simpson.com, 192.168.188.*, 2001:db8:2042::*
 ALLOW_ADMINISTRATOR = $(IP_ADDRESS)
 use POLICY : ALWAYS_RUN_JOBS
#use POLICY : DESKTOP
 WANT_VACATE = FALSE
 WANT_SUSPEND = TRUE
#DAEMON_LIST = MASTER SCHEDD COLLECTOR NEGOTIATOR STARTD # on computer called homer
#DAEMON_LIST = MASTER SCHEDD STARTD KBDD                 # on computer called lisa if keyboard idle 15 minutes option was chosen
 DAEMON_LIST = MASTER SCHEDD STARTD                       # on computer called lisa

Submit job

1. Add a job to the Batch list in the Run tab.
2. Click on the Run in HTCondor Cluster button (button with triangle and network).

Show information on HTCondor cluster

1. Click on Show Additional Info for Cluster Simulation.
2. Press the Refresh button on the right.
3. The results of the condor_status command are shown, i.e. the number of compute slots are displayed.
4. You can select another HTCondor command such as condor_q to show the status of your submitted jobs, i.e. select condor_q, and then press the Refresh button.

• You can type in any command in the line System command:, e.g. dir.
• The button Open Documentation opens the online documentation (this website).

Results of HTCondor simulations

• Once your HTCondor jobs are finished, the results are automatically copied back to your simulation output folder <nextnano simulation output folder\<name of input file>\.
• For debugging purposes regarding the HTCondor job, you can analyze the generated log file, <input file name>.log.

• condor_submit <filename>.sub Submit a job to the pool.
• condor_q Shows current state of own jobs in the queue.
  • condor_q -nobatch -global -allusers Shows state of all jobs in the cluster. Of all users.
  • condor_q -goodput -global -allusers Shows state and occupied CPU of all jobs in the cluster.
  • condor_q -allusers -global -analyze Detailed information for every job in the cluster.
  • condor_q -global -allusers -hold Shows why jobs are in hold state.
• condor_status Shows state of all available resources.
• condor_status -long Shows state of all available resources and many other information.
• condor_status -debug Shows state of all available resources and some additional information, e.g. WARNING: Saw slow DNS query, which may impact entire system: getaddrinfo(<Computername>) took 11.083566 seconds.
• condor_rm Remove jobs from a queue:
  • condor_rm -all Removes all jobs from a queue.
  • condor_rm <cluster>.<id> Removes jobs on cluster <cluster> with id <id> (It seems <cluster>. can be omitted, and id is the JOB_IDS number.)
• condor_release -all If any jobs are in state hold, use this command to restart them.
• condor_restart Restart all HTCondor daemons/services after changes in config file.
• condor_version Returns the version number of HTCondor
• condor_store_cred query Returns info about the credentials stored for HTCondor jobs
• condor_history Lists the recently submitted jobs. If for a specific job ID the status has the value ST=C, then this job has been completed (C) successfully.
• condor_status -master: returns Name, HTCondor Version, CPU and Memory of central manager
• Open Command Prompt cmd.exe as Administrator. Type in: net start condor. This has the same effect as restarting your computer, i.e. the networking service condor is started. This is useful if you have changed your local condor_config file.

With this option in the condor.config file on the central manager, one can set a policy that the jobs are spread out over several machines rather than filling all slots of one computer before filling the slots of the other computers.

##------nn: SPREAD JOBS BREADTH-FIRST OVER SERVERS
##-- Jobs are "spread out" as much as possible,
##   so that each machine is running the fewest number of jobs.
NEGOTIATOR_PRE_JOB_RANK = isUndefined(RemoteOwner) * (- SlotId)

Q: I submitted a job to HTCondor, but nothing happens. nextnanomat says “transmitted”.

A: It could be that nextnanomat does not have read in all required settings. You can try to type in the command line condor_restart. Please make sure that you entered your credentials using condor_store_cred add -debug. You should then start nextnanomat again.

Q: I submitted a job to HTCondor, but the Batch line of nextnanomat is stuck with preparing. What is wrong?

A1: Did you store your credentials after the installation of HTCondor? If not, enter condor_store_cred add into the command prompt to add your password, see above (Recommended Installation Process).

A2: Did you change your password recently? If yes you have to reenter your credentials for HTCondor. Enter condor_store_cred add into the command prompt to add your password, see above (Recommended Installation Process). If this does not work, try to enter condor_store_cred add -debug for more output information on the error.

Q: I specified target machines in Tools - Options. Afterwards every submitted job to HTCondor is stuck with transmitting. What is wrong?

A: The value for UID_DOMAIN within the condor_config file needs to be the same for every computer of your cluster. (You can easily test it in a command prompt with condor_status -af uiddomain) If it's not the same value, no matching computer will be found and the job won't be transmitted successfully.

If you receive the following error when you type in condor_status

C:\Users\"<your user name>">condor_status
Error: communication error
CEDAR:6001:Failed to connect to <123.456.789.123>

you can check whether the computer associated with this IP address is your HTCondor computer using the following command.

nslookup 123.456.789.123

It is also a good idea to type in

nslookup

This will return the name of the Default Server that resolves DNS names. If it is not the expected computer, you can open a Command Prompt as Administrator and type in ipconfig /flushdns to flush the DNS Resolver Cache.

C:\Users\"<your user name>">ipconfig /flushdns

If the DNS address cannot be resolved correctly it could be related to a VPN connection that has configured a different default server for Domain Name to IP address mapping. E.g. if your Windows Domain is called contoso.com (which is only visible within your own network and your own HTCondor pool) but your DNS is resolved to www.contoso.com (which might be outside your local HTCondor pool).

Solution: Edit condor_config file and add host, i.e. local computer name (here: nn-delta).

    ALLOW_WRITE = $(CONDOR_HOST), $(IP_ADDRESS)
==> ALLOW_WRITE = $(CONDOR_HOST), $(IP_ADDRESS), nn-delta

If you encounter any strange errors, you can find some hints in the history or Log files generated by HTCondor. You can find them here:

C:\condor\spool

• history

C:\condor\log

• CollectorLog
• MasterLog
• MatchLog
• NegotiatorLog
• ProcLog
• SchedLog
• ShadowLog
• SharedPortLog
• StarterLog
• StartLog

More details can be found here: Logging in HTCondor