Job with FlexLM licenses requirements

In this page, we will see how Scale-Out Computing on AWS manages job and capacity provisioning based on license availabilities.

Example configuration

Test settings used for all examples:

License Server Hostname: licenses.soca.dev
License Server port: 5000
License Daemon port: 5001
Feature to check: Audio_System_Toolbox
Scale-Out Computing on AWS cluster name: rctest

Firewall Configuration¶

Depending your configuration, you may need to edit the security groups to allow traffic to/from your license servers.

FlexLM server installed on Scheduler host

No further actions are required if you have installed your FlexLM server on the scheduler host as Scale-Out Computing on AWS automatically allow all traffic between the scheduler and the compute nodes.

Warning

FlexLM configure two ports for each application (DAEMON and SERVER ports). You need to allow both of them.

Allow traffic from your license server IP to Scale-Out Computing on AWS

Assuming my license server IP is 10.0.15.18, simply go to the EC2 console, locate your Scheduler and ComputeNode security groups (filter by your cluster name) associated to your Scale-Out Computing on AWS cluster and allow both SERVER and DAEMON ports:

Allow traffic from Scale-Out Computing on AWS to your license server

Since FlexLM use client/server protocol, you will need to authorize traffic coming from Scale-Out Computing on AWS to your license servers for both SERVER and DAEMON ports. You will need to allow the IP for your scheduler as well as the NAT Gateway used by the compute nodes. Your Scheduler Public IP is listed on CloudFormation, to retrieve your NAT Gateway IP, visit VPC console, select NAT Gateway and find the NAT Gateway IP associated to your Scale-Out Computing on AWS cluster.

Upload your lmutil¶

lmutil binary is not included with Scale-Out Computing on AWS. You are required to upload it manually and update /apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py with the location of your file.

Note

You do not need to install FlexLM server manager. Only lmutil binary is required.

lmutil and RHEL based distro

FlexLM may requires 32 bits lib depending your system. If launching lmutil returns an ELF version mismatch, simply install yum install redhat-lsb (or equivalent)

How to retrieve number of licenses available¶

Scale-Out Computing on AWS includes a script (/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py) which output the number of FlexLM available for a given feature. This script takes the following arguments:

-s: The license server hostname
-p: The port used by your flexlm deamon
-f: The feature name (case sensitive)
(Optional) -m: Reserve licenses number for non HPC usage

Let say you have 30 Audio_System_Toolbox licenses and 4 are currently in use. The command below will list how many licenses are currently available to use for your jobs:

license_check.py -s licenses.soca.dev -p 5000 -f Audio_System_Toolbox
26

Now let's say you want to reserve 15 licenses for non HPC/Scale-Out Computing on AWS usage:

license_check.py -s licenses.soca.dev -p 5000 -f Audio_System_Toolbox -m 15 
11

Info

license_check.py is simply a lmutil wrapper. You can get the same output by running the command below and adding some regex validations. You can edit the script to match your own requirements if needed

lmutil lmstat -a -c 5000@licenses-soca.dev | grep "Users of Audio_System_Toolbox:"

Integration with Scale-Out Computing on AWS¶

IMPORTANT

The name of the resource must be *_lic_*. We recommend using <application>_lic_<feature_name>

Update your /apps/soca/$SOCA_CONFIGURATION/cluster_manager/settings/licenses_mapping.yml and create a new resource. This file must follow the YAML syntax.

# There is no requirements for section names, but I recommend having 1 section = 1 application

matlab:
  matlab_lic_audiosystemtoolbox: "/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 5000 -f Audio_System_Toolbox"

# Example for other daemons/features
comsol:
  comsol_lic_acoustic: "/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 27718 -f ACOUSTICS"
  comsol_lic_cadimport: "/apps/soca/cluster_manager/license_check.py -s licenses.soca.dev -p 27718 -f CADIMPORT"

synopsys:
  synopsys_lic_testbenchruntime: "/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 27020 -f VT_TestbenchRuntime"
  synopsys_lic_vcsruntime: "/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 27020 -f VCSRuntime_Net"
  synopsys_lic_vipambaaxisvt: "/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 27020 -f VIP-AMBA-AXI-SVT"

This parameter will let Scale-Out Computing on AWS knows your license mapping and capacity will only be provisioned if enough licenses are available based on job's requirements.

Since you are about to create a new custom resource, additional configuration is required at the scheduler level. On the scheduler host, edit /var/spool/pbs/sched_priv/sched_config and add a new server_dyn_res

server_dyn_res: "matlab_lic_audiosystemtoolbox !/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 5000 -f Audio_System_Toolbox"

On the same file, add your new resource under resources section. This section will not allow a job to run if the amount of assigned resources exceeds the available amount.

resources: "matlab_lic_audiosystemtoolbox, ncpus, mem, arch, host, vnode, aoe, eoe, compute_node"

Finally, edit /var/spool/pbs/server_priv/resourcedef and add your new resource with type=long

...
ht_support type=string
base_os type=string
fsx_lustre_bucket type=string
fsx_lustre_size type=string
fsx_lustre_dns type=string
matlab_lic_audiosystemtoolbox type=long

Once done, restart the scheduler using service pbs restart

Test¶

For this example, let's assume we do have 3 "Audio_System_Toolbox" licenses available

/apps/soca/$SOCA_CONFIGURATION/cluster_manager/license_check.py -s licenses.soca.dev -p 5000 -f Audio_System_Toolbox
3

Let's try to submit a job which require 5 licenses

qsub -l matlab_lic_audiosystemtoolbox=5 -- /bin/sleep 600
31.ip-20-0-2-69

Let's check the log files under /apps/soca/$SOCA_CONFIGURATION/cluster_manager/log/<QUEUE_NAME>. Scale-Out Computing on AWS will ignore this job due to the lack of licenses available

 [157] [INFO] [License Available: {'matlab_lic_audiosystemtoolbox': 3}]
 [157] [INFO] [Next User is mickael]
 [157] [INFO] [Next Job for user is ['31']]
 [157] [INFO] [Checking if we have enough resources available to run job_31]
 ....
 [157] [INFO] [No default value for matlab_lic_audiosystemtoolbox. Creating new entry with value: 5]
 [157] [INFO] [Ignoring job_31 as we we dont have enough: matlab_lic_audiosystemtoolbox]

If you have multiple jobs in the queue, the license counter is dynamically updated each time the dispatcher script is running (every 3 minutes):

 [157] [INFO] [License Available: {'matlab_lic_audiosystemtoolbox': 10}]
 [157] [INFO] [Checking if we have enough resources available to run job_31]
 ....
 [157] [INFO] [No default value for matlab_lic_audiosystemtoolbox. Creating new entry with value: 5]
 # Next job in in queue
 [157] [INFO] [License Available: {'matlab_lic_audiosystemtoolbox': 5}]
 [157] [INFO] [Checking if we have enough resources available to run job_32]
 ....
 [157] [INFO] [No default value for matlab_lic_audiosystemtoolbox. Creating new entry with value: 5]
 # Next job in in queue
 [157] [INFO] [License Available: {'matlab_lic_audiosystemtoolbox': 0}]
 [157] [INFO] [Checking if we have enough resources available to run job_33]
 ....
 [157] [INFO] [No default value for matlab_lic_audiosystemtoolbox. Creating new entry with value: 5]
 [157] [INFO] [Ignoring job_33 as we we dont have enough: matlab_lic_audiosystemtoolbox]

Scale-Out Computing on AWS ensures licenses provisioned for given jobs are in use before provisioning capacity for new jobs

Let say you have 10 licenses available and you submit job1 and job2 which both have a requirement of 5 licenses. Scale-Out Computing on AWS will determine licenses are available and will start provision the capacity.

Shortly after you submit job3 which require another 5 licenses. The first 2 jobs may not have started yet, meaning you still have 10 licenses available (even though the 10 licenses will be used by job1 and job2 as soon as they start). In that case we skip job3 until both job1 and job2 and in running state.

Invalid Resource

You can not submit if you are using an invalid resource (aka: resource not recognized by the scheduler). If you are getting this error, refer to section Integration with Scale-Out Computing on AWS)

qsub -l matlab_lic_fakeresource=3 -- /bin/sleep 60
qsub: Unknown resource Resource_List.matlab_lic_fakeresource