Benefits, requirements, limitations, and known issues for Rational Software Architect products running as 64-bit applications starting from v8.0.3

• Benefits of 64-bit installation
• Requirements
• Known limitations
• Known issues

---

Benefits of 64-bit installation

• Extends heap size
• Ability to manage larger models

32-bit vs. 64-bit Comparisons (RSA = Rational Software Architect)

Ability to create and work with larger models

Product & Machine	Heap setting	# Elements	# Packages	# Diagrams
RSA v8.0.x 32-bit 8 GB RAM	-Xmx 2000m	135200	16900	101400
RSA v8.0.x 64-bit 8 GB RAM	-Xmx 4000m	396800	49600	297600

Compare/merge (large model comparisons)

Product & Machine	Heap setting	15 MB model file 168,508 classes + 169 packages	20 MB model file 224,284 classes + 225 packages	90 MB model file 1,005,084 classes + 1006 packages
RSA v8.0.x 32-bit 8 GB RAM	-Xmx 1500m	Success Head sis: 1.481GB	Out of Memory	Out of Memory
RSA v8.0.x 64-bit 8 GB RAM	-Xmx 8000m*	Success Head sis: 1.481GB	Success Head sis: 1.481GB	Success Head sis: 1.481GB

*NOTE, not all 8GB is available due to system requirements (e.g., OS)

Web publish (Successfully published a large model (235 MB file, 700 MB heap space to load, 1,800+ packages, 100,000 first class elements and 10,000 diagrams) using the RSA 64-bit offering)

Product & Machine	Heap setting	Result
RSA v8.0.x 32-bit 8 GB RAM	-Xmx 1024m	Out of Memory
RSA v8.0.x 64-bit 8 GB RAM	-Xmx 6448m	Successfully generated 2.8Gb of output: 1.3GB of XML in 1.820 files An 80MB json file defining the tree display 1GB of HTML in over 100,000 files

Rational Rose model import: Able to successfully import 100MB, 450MB, 670MB test models in non-incremental mode using the 64-bit offering while the 32-bit offering could only load the 100MB model.*

*NOTE, all models can be opened in RSA 32-bit mode using incremental load.

---

Requirements

Action	Requirement(s)
Installation	IBM Installation Manager 1.4.4 required Installation on supported Windows or Linux 64-bit Operating Systems Full Installation required (upgrade from previous 32-bit installation is not supported) To use Installation Manager to install 64-bit application on RHEL 6.0 x86_64 (64-bit) When using Eclipse or P2 updater to install new plug-ins, in a shared "write-protected" installation, the owner of the installation (i.e. Administrator) vs. user must perform this action Using the "64-bit" Architecture Selection option in the Install Packages view during installation By default: Architecture Selection is "32-bit" Note: 64-bit installation on Solaris (Rational Software Architect RealTime Edition) not supported Separate 32-bit/64-bit installations (on the same machine) are supported
Recommended hardware configuration	Minimum 8 GB RAM with minimum 4 GB Heap Note: -Xcompressedrefs (IBM VM) or -XX:+UseCompressedOops (Sun) flag, may optimize memory usage for 64-bit machines with less than 32GB

Limitations

	Limitation(s)
Operating system	64-bit Installation not supported on Solaris
Product features not supported in 64-bit install	DoDAF 1.0 Reporting - Ability to generate an Microsoft Word document (reporting) is not supported. Rational Rose model import: - When Rational Rose model uses stereotypes & properties and Rational Rose not installed on the same machine. Work-around: Export entries from registry to *.reg file and supply to importer. Java Visual Editor
Integrations	Supported when shell-sharing: Rational Desktop Connection Toolkit for Cloud v1.0.3 WebSphere Application Server Test Environment (32-bit), v6.1.0.37, v7.0.0.17, v8.0 Supported as co-installs, only: InfoSphere Data Architect Rational Business Developer Rational Developer for System z Rational Functional Tester Rational PerformanceTester Rational Requirements Composer Rational Rose Rational System Architect Rational Tau WebSphere Business Modeler WebSphere Integration Developer Integrations not supported with 64-bit Install: Rational Asset Manager Rational Build Forge Rational ClearCase (base) Rational ClearQuest Rational Requisite Pro Rational SoDA (32-bit install on 64-bit architecture is not supported either) Rational Team Concert
WebSphere Application Server	You can install the WebSphere Application Server test environment extensions into the installation location. However, the test environment extensions will be 32-bit versions. Some product features might not be available
Web browsers	Internet Explorer v8.0 is not supported with 64-bit install. Internet Explorer v9.0 or higher is supported.

Known issues

• Shared 'read-only' 64-bit Installations Only: User installed plug-ins may not load correctly
• 64-bit Architecture Selection installation option is shown as available for Rational Software Architect RealTime Edition v8.0.3 on Solaris SPARC, but is not supported
• Cannot install Rational Team Concert Client into existing 64 Bit package group
• Internet Explorer v9 or higher is required if the product was installed using 64-bit Bit Mode option on a 64-bit system
• List of related support documents about additional known issues for installing or running these products as a 64-bit applications, including any applicable work-arounds

---

Co-installing vs shell-sharing

Co-install means two or more products are installed on the same machine, but into different package groups (each product functions independently).

Shell-share means two or more products are installed on the same machine in the same package groups. When starting one of the products, the functionality in other products will also be available.

]Known issues[