如何查询qsub调度的下一个启动作业？（印度科学院超算环境）

Great question! Navigating PBS Pro's scheduler (used with qsub on IISc Bangalore's supercomputer) can feel opaque when trying to predict which pending job will start next—especially since it factors in wall time, queue position, and other dynamic variables. Here are a few reliable methods to get this insight:

• Check pending jobs with priority details
  Use the qstat -s p -f command to list all pending (p state) jobs with full details. Look for the Priority field in each job's output—this is a numerical value the scheduler uses to rank jobs. Generally, the pending job with the highest priority score is the next candidate to launch once resources become available. You can also narrow this down to a specific queue (e.g., small/medium) by adding the queue name: qstat -s p -f -Q small.

• Inspect queue-specific scheduling order
  Run qstat -Qf <queue-name> (replace <queue-name> with small/medium/large) to get detailed info about the queue's configuration and the list of jobs waiting in it. The output will include a section for pending jobs, ordered by their scheduler-assigned priority. This gives you a queue-level view of which job is next in line.

• Use real-time job monitoring tools (if available)
  Some HPC clusters have qtop installed—a tool similar to the system top command but tailored for PBS jobs. It shows a live, sorted view of pending and running jobs, making it easy to spot which pending job is at the top of the scheduler's list. Just type qtop in your terminal to launch it (if your cluster supports it).

A quick note: While these methods give you a strong prediction, the scheduler can adjust the order dynamically—for example, if a running job finishes earlier than expected, or if an administrator tweaks queue priorities. But in most cases, the highest-priority pending job will be the next one to start.

内容的提问来源于stack exchange，提问作者Debarshi Majumder