uprava popisu vzhledem k nastaveni preempce

README.md

@@ -19,8 +19,8 @@ Anyway, we have provided a short description of SLURM and of our clusters.
 ### Terminology
 
 A **cluster** is a bunch of **nodes**.
-Nodes are grouped together to partitions.
-Partitions may overlap, ie. one node can be in more **partitions**.
+Nodes are grouped together to **partitions**.
+Partitions may overlap, ie. one node can be in more partitions.
 **Feature** is a string describing a feature of a node, e.g. avx2 for a node capable of executing AVX2 instructions.
 Each node has two sets of features: current features and available features.
 Usually, they are same.
@@ -42,7 +42,12 @@ Each step is executed by a bunch of **tasks** (usually 1 task), where resources
 Jobs are inserted to a **scheduling queue**, where you can find them.
 
 Partition has a priority.
-A job submitted to a partition with higher **priority** can suspend an another job submitted to a partition with lower priority.
+A job submitted to a partition with higher **priority** can preempt an another job submitted to a partition with lower priority.
+Our clusters use only two kind of preemption:
+
+- **SUSPEND** - the preempted job is suspended and releases CPUs. Unfortunately, it does not release memory or GPUs.
+- **REQUEUE** - the preempted job is killed and requeued to the scheduling queue, waiting for available resources.
+All resources including GPUs are released.
 
 ### Important commands
 
@@ -134,15 +139,15 @@ Parlab nodes
 
 Parlab partitions
 
-| Name     | Nodes      | Priority | Timelimit | Intended use |
-| -------- | ---------- | -------- | --------- | ------------ |
-| big-lp   | w[401-404] | low      | 1 day     | default, general or MPI debugging, long jobs |
-| big-hp   | w[401-404] | high     | 1 hour    | executing short jobs on 4-socket system, MPI jobs |
-| small-lp | w[201-208] | low      | 1 day     | debugging on newer CPUs, MPI debugging, long jobs |
-| small-hp | w[201-208] | high     | 30 mins   | executng short jobs on 2-socket system, MPI jobs |
-| phi-lp   | phi[01-02] | low      | 1 day     | KNL debugging, long jobs |
-| phi-hp   | phi[01-02] | high     | 30 mins   | executing short jobs on KNL |
-| all      | all        | high     | 30 mins   | executing short jobs on all nodes, used primarily for testing heterogeneous MPI computing |
+| Name     | Nodes      | Priority | Timelimit | Preemption | Intended use |
+| -------- | ---------- | -------- | --------- | ---------- | ------------ |
+| big-lp   | w[401-404] | low      | 1 day     | SUSPEND    | default, general or MPI debugging, long jobs |
+| big-hp   | w[401-404] | high     | 1 hour    | SUSPEND    | executing short jobs on 4-socket system, MPI jobs |
+| small-lp | w[201-208] | low      | 1 day     | SUSPEND    | debugging on newer CPUs, MPI debugging, long jobs |
+| small-hp | w[201-208] | high     | 30 mins   | SUSPEND    | executng short jobs on 2-socket system, MPI jobs |
+| phi-lp   | phi[01-02] | low      | 1 day     | SUSPEND    | KNL debugging, long jobs |
+| phi-hp   | phi[01-02] | high     | 30 mins   | SUSPEND    | executing short jobs on KNL |
+| all      | all        | high     | 30 mins   | SUSPEND    | executing short jobs on all nodes, used primarily for testing heterogeneous MPI computing |
 
 #### Gpulab cluster specification
 
@@ -161,13 +166,13 @@ Gpulab nodes
 
 Gpulab partitions
 
-| Name      | Nodes            | Priority  | Timelimit | Intended use |
-| --------- | ---------------- | --------- | --------- | ------------ |
-| debug-lp  | dw[01-04],varjag | low       | 7 days    | default, general debugging, long jobs, build Docker image |
-| debug-hp  | dw[01-04],varjag | high      | 1 hour    | short jobs, build Docker image |
-| volta-elp | volta03          | extra low | 7 days    | extra long GPU jobs |
-| volta-lp  | volta[02-03]     | low       | 1 day     | long GPU jobs |
-| volta-hp  | volta[01-03]     | high      | 1 hour    | debugging GPU task, executing short GPU jobs |
+| Name      | Nodes            | Priority  | Timelimit | Preemption | Intended use |
+| --------- | ---------------- | --------- | --------- | ---------- |------------ |
+| debug-lp  | dw[01-04],varjag | low       | 7 days    | SUSPEND    | default, general debugging, long jobs, build Docker image |
+| debug-hp  | dw[01-04],varjag | high      | 1 hour    | SUSPEND    | short jobs, build Docker image |
+| volta-elp | volta[01-03]     | extra low | 7 days    | REQUEUE    | extra long GPU jobs |
+| volta-lp  | volta[01-03]     | low       | 1 day     | REQUEUE    | long GPU jobs |
+| volta-hp  | volta[01-03]     | high      | 1 hour    | SUSPEND    | debugging GPU task, executing short GPU jobs |
 
 ### Useful examples