Home
Altair Accelerator User Guide
Basic tasks in Accelerator, including submitting jobs, tracking job information, and analyzing and solving common problems.
Schedule Job Submission
Job Submission Arguments
Job submission can be affected by the value of the optional variables NC_RUN_ARGS and NC_RUN_ARGS, which specify a list of arguments that are pre-pended and appended to the argument list passed to the submission command.

Welcome
What's New
View new features for Accelerator 2025.1.2.
Accelerator Overview
Discover the available Altair Accelerator guides.
Accelerator Tutorials
Discover Accelerator functionality with interactive tutorials.
Altair Accelerator User Guide
Basic tasks in Accelerator, including submitting jobs, tracking job information, and analyzing and solving common problems.
- Use Accelerator Help
  Accelerator documentation is available in HTML and PDF format.
- Accelerator Quick Start
  Accelerator has two main commands, nc and ncmgr.
- Command Line Interface
- Quick Reference
- User Shell Setup
  To set up your user shell with Accelerator you need to know where the Altair Accelerator software has been installed.
- Running a Job
  This section summarizes how to submit and run a job.
- Job Management
- Schedule Job Submission
  - Queue Selection
    A queue is a cluster, a group or farm of machines. Accelerator supports multiple queues that are managed by the same vovserver. Queue names begin with the letters vnc.
  - Scheduled Jobs
    Jobs that can not be dispatched immediately due to resource shortage, such as CPUs or software licenses, are put on the job queue.
  - Priority
    The scheduling priority affects the order in which the jobs are scheduled. The range is 1 to 15.
  - Distributed Parallel Support
    Accelerator supports jobs that require multiple CPUs that can be located on different machines.
  - Multiphase Support
  - Job Submission Arguments
    Job submission can be affected by the value of the optional variables NC_RUN_ARGS and NC_RUN_ARGS, which specify a list of arguments that are pre-pended and appended to the argument list passed to the submission command.
- Modify Running Jobs
- FairShare Groups
- Job Placement Policies
- Clean Up Log Files
  All log files are normally stored under the subdirectory ./vnc_logs. To remove all obsolete log files in the current working directory, use the nc clean command.
- Debug Jobs without Running Accelerator
  On occasion, jobs that run successfully outside of Accelerator fail when run through Accelerator. When this occurs, mostly likely the setups are not the same: the environment, inputs or other parameters may be different, a misconfiguration or there is a problem with NFS.
- Job Runtime - Monitor and Profile
  When a job is running through a vovtasker, the tasker automatically monitors RAM and CPU utilization of the job, including all of its children.
- Monitor the Workload
- Statistical Information about Resources and Jobs
  Reports provide statistical information about all the jobs that are run during a specified time and the usage of the resources that run jobs. The resources include CPU time, licenses, memory and more.
- Environment Control
  Setting the environment is critical for correct job execution. Accelerator provides two methods to control the execution environment.
- Job Resources
  Some jobs may require a specific platform or operating system (OS) to run. As Accelerator automatically lists platform/OS as a tasker resources, the task of finding the right host to execute a job is easy: specify the required platform/OS as part of the job resource requirements.
- Advanced Information
- Frequently Asked Questions and Troubleshooting Tips
- Deprecated Commands
  This section lists the recently deprecated and obsoleted Accelerator commands and options, and the corresponding current commands and options.
- LSF Emulation
  This document is intended for those who have been using the Platform LSF batch system and are now moving over to the Accelerator system.
Altair Accelerator Administrator Guide
Configure and manage the use of Accelerator after it is installed.

Job Submission Arguments

Job submission can be affected by the value of the optional variables NC_RUN_ARGS and NC_RUN_ARGS, which specify a list of arguments that are pre-pended and appended to the argument list passed to the submission command.

For example, if the variables are defined as follows:

% setenv NC_RUN_ARGS "-D"
% setenv NC_RUN_ARGS_AFTER "-jobproj myproj123"

Then the submission

% nc run -p high sleep 10

Becomes effectively

% nc run -D -p high -jobproj myproj123 sleep 10