Snow Owl Docs
9.x
9.x
  • Introduction
  • Quick Start
    • Create your first Resource
    • Import SNOMED CT
    • Find concepts by ID or term
    • Find concepts using ECL
    • Next steps
  • Setup and Administration
    • Plan your deployment
      • Technology stack
      • Hardware requirements
      • Software requirements
    • Configuration
      • Release package
      • Folder structure
      • Get SSL certificate (optional)
      • Preload dataset (optional)
      • Configure Elastic Cloud (optional)
      • System settings
      • Spin up the service
    • Upgrade Snow Owl
    • Backup and restore
      • Backup
      • Restore
    • User management
    • Advanced installation methods
      • Install Snow Owl
        • Using an archive
        • Using RPM
        • Using DEB
      • System configuration
        • Disable swapping
        • File descriptors
        • Virtual memory
        • Number of threads
      • Configure Snow Owl
      • Start Snow Owl
      • Stop Snow Owl
    • Advanced configuration
      • Setting JVM options
      • Logging configuration
      • Elasticsearch configuration
      • Security
        • File realm
        • LDAP realm
  • Terminology Standards
    • SNOMED CT
      • Extensions and Snow Owl
      • Scenarios
        • Single Edition
        • Single Extension Authoring
        • Multi Extension Authoring
      • Development
      • Releases
      • Upgrading
    • LOINC
    • Socialstyrelsen Standards
      • ICD-10-SE
      • ICF
      • KVÅ (KKÅ/KMÅ)
  • Content syndication
  • REST APIs
    • FHIR API
      • CodeSystem
      • ValueSet
      • ConceptMap
    • Native API
      • Resource management
      • Content access
      • Content management
      • SNOMED CT API
        • Branching
        • Compare
        • Concepts
        • Reference Sets
  • Release notes
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  1. Setup and Administration
  2. Advanced installation methods
  3. System configuration

Number of threads

Snow Owl uses a number of thread pools for different types of operations. It is important that it is able to create new threads whenever needed. Make sure that the number of threads that the Snow Owl user can create is at least 4096.

This can be done by setting ulimit -u 4096 as root before starting Snow Owl, or by setting nproc to 4096 in /etc/security/limits.conf.

The package distributions when run as services under systemd will configure the number of threads for the Snow Owl process automatically. No additional configuration is required.

Last updated 1 year ago