Start/notes.ini Parameters/HTTP_MaxActiveThreads

HTTP_MaxActiveThreads

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Parameter: HTTP_MaxActiveThreads
Short description: Maximum number of active HTTP worker threads on the Domino web server.

Profile

Parameter
HTTP_MaxActiveThreads
Category
HTTP / Web
Component
Server
Available since
R5
Supported versions
9.0.1, 10.0, 11.0, 12.0, 14.0, 14.5
GUI equivalent
Server document (Internet Protocols → HTTP → Basics)
Possible values
Integer 1–999, default 40 (recommended 40–200 depending on load)

Description

HTTP_MaxActiveThreads defines how many HTTP requests the Domino web server may process concurrently. If the available threads are not enough, additional requests are placed in a queue – visible as rising response times in the browser.
For pure XPages/Verse servers, raising the value pays off; however, each thread requires about 10–20 MB of additional JVM memory, so the value must always be chosen in proportion to HTTPJVMMaxHeapSize and the available RAM.

Example configuration

HTTP_MaxActiveThreads=80
HTTPJVMMaxHeapSize=2G

Notes & pitfalls

  • The default of 40 is usually too small for heavily used XPages applications.
  • Higher → more RAM required by the HTTP/JVM process.
  • Can also be set identically in the Server document – notes.ini wins if present.
  • Monitoring: show stat Domino.Workers.*, show stat HTTP.*.
  • Reverse proxy / LB connections (keep-alive) count per open connection – size up if needed.
  • The change only takes effect after a restart of the HTTP task.