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Status Future consideration
Workspace IBM i
Categories IBM i Access Family
Created by Guest
Created on Dec 21, 2020

ACS - Consuming high memory in Citrix

Our Citrix users workstation were recently upgraded from IBM i Access for Windows to Access Client Solutions. And we observed that ACS was consuming high amount of memory.
Citrix team already tried this document found in IBM portal (
However, this workaround is only feasible in small environment whereby each user have 1/or less than 1 .hod file.
We have 1000+ users in Citrix and each user is having more than 1 .hod/.dtfx file, and this workaround is no longer applicable.
We have no control to prevent users from creating new .hod/.dtfx file, and user does not have the technical knowledge to create ACS shortcut for each .hod/.dtfx file.

Hope you can assist to address this memory issue.
Thank you

Use Case: - Followed the guidelines from this document but this is not feasible with 1000+ users in Citrix.

Idea priority High
  • Guest
    Jun 29, 2021

    The CAAC has reviewed this requirement and recommends that IBM not implement this request. This may be a Citrix configuration issue -- it likely does not have anything to do with ACS.

    In at least in one significant customer instance that CAAC is aware of, it was not a memory issue. The problem was resolved by running the applications with the Citrix profile manager.

    The problem was a profile issue. Are you using Citrix Profile Management with roaming profiles? The problem the known customer had on their last Citrix Deployment was that they were running Citrix Profile Management & Roaming Profiles. There is a registry hive that ACS needs that is not supported using roaming profiles. The customer since moved off of Citrix Roaming Profiles & they are using a product for profiles called Profile Unity by Liquidware.

    Background: The COMMON Americas Advisory Council (CAAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CAAC has a key role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community, and has therefore reviewed your RFE.

    For more information about CAAC, see

    Nancy Uthke-Schmucki - CAAC Program Manager

  • Guest
    Feb 15, 2021

    To reduce the memory requirements, here are the options available today:
    1. The article you referenced Once you figure out the memory settings needed, you could update the installation script so the required memory settings would be used. Note that different types of users will likely have different memory requirements.
    2. Many features in ACS are also in Navigator for i including 5250 emulation. You may want to consider having some users use Navigator for i to reduce the overall memory requirements on your Citrix server.
    3. If 5250 emulation is the primary feature being used, you may want to consider purchasing Personal Communication for 5250. That emulator will be very similar to IBM i Access for Windows.

    We will continue to consider ways to optimize memory usage, but cannot make any commitment as to if and when that will happen.

  • Guest
    Jan 18, 2021

    The CEAC has reviewed this requirement and recommends that IBM view this as a HIGH priority requirement that is important to address.

    Whilst this does not necessarily apply to a large number of end-users, by definition when it does it can hold back the migration of many thousands of users to ACS. We, therefore, think IBM should address this issue and optimise ACS for high-density Citrix environments.

    Background: The COMMON Europe Advisory Council (CEAC) members have a broad range of experience in working with small and medium-sized IBM i customers. CEAC has a crucial role in working with IBM i development to help assess the value and impact of individual RFEs on the broader IBM i community and has therefore reviewed your RFE.

    To find out how CEAC help to shape the future of IBM i, see CEAC @ and the article "The Five Hottest IBM i RFEs Of The Quarter" at

    Therese Eaton – CEAC Program Manager, IBM