概要信息：

Allegro® Platform 
System Requirements
Product Version 16.6
October 2012
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Allegro Platform System Requirements
ContentsAllegro® Platform System Requirements. . . . . . . . . . . . . . . . . . . . . . . 5
Microsoft Windows System Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Using Spaces in File and Directory Names  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Linux System Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Solaris SparcSystem Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
IBM AIX System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Improving Performance on UNIX Systems  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Displaying UI Dialog Boxes Correctly  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Non-Native X Emulators  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Virtual Environment Support  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
File Server Support  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Graphics Requirements for Physical Design Products  . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Planning Hardware Purchases for Physical Design Products  . . . . . . . . . . . . . . . . . . . . . 14
Additional Recommendations for Allegro Package Designer and SiP Products  . . . . . . . 16
Compiler Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Managing Licenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Frequently Asked Questions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
What will happen if disk minimums are not met? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Can you specify a true memory hard limit where Allegro will not run? . . . . . . . . . . . . 20
Can you be more specific on memory requirements?  . . . . . . . . . . . . . . . . . . . . . . . . 20
Will adding more memory improve Allegro performance?  . . . . . . . . . . . . . . . . . . . . . 20
What other things may impact performance? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Will multiple core/CPUs improve Allegro performance? . . . . . . . . . . . . . . . . . . . . . . . 21October 2012 3 Product Version 16.6
Allegro Platform System RequirementsOctober 2012 4 Product Version 16.6
Allegro Platform System RequirementsAllegro® Platform System Requirements
This document contains the recommended system requirements for Cadence Silicon-
Package-Board (SPB) tools, Release 16.5.
■ Microsoft Windows System Requirements on page 6
■ Solaris SparcSystem Requirements on page 9
■ Linux System Requirements on page 8
■ IBM AIX System Requirements on page 10
■ Improving Performance on UNIX Systems on page 11
■ Displaying UI Dialog Boxes Correctly on page 11
■ Non-Native X Emulators on page 11
■ Graphics Requirements for Physical Design Products on page 13
■ Planning Hardware Purchases for Physical Design Products on page 14
■ Additional Recommendations for Allegro Package Designer and SiP Products on 
page 16
■ Compiler Requirements on page 17
Important
If you use a physical design product (Allegro PCB, APD, Allegro SI or Cadence SiP), 
be sure to read Graphics Requirements for Physical Design Products on page 13.
Important
All UNIX/Linux platforms: To ensure that your system is configured with the correct 
operating system patches, run the checksysConf program. You can download 
checksysConf from Cadence Online Support.October 2012 5 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsMicrosoft Windows System Requirements
This section describes the system requirements for Windows.
Because Cadence Silicon-Package-Board (SPB) products are integrated directly with 
Windows, hardware and peripherals supported by Windows are also supported by the 
Cadence SPB products. A list of hardware and peripherals officially supported by Windows 
can be obtained from the Microsoft web page.
SPB products require updating certain Microsoft libraries in the Windows directory. You must 
install the Cadence software either using the desktop mode or client install.  You may no 
longer be able to point to the Cadence software without installing. 
Note: Once you install 16.6, you should only use the 16.6 version of the switchversion 
program to change releases. The installer always places this program at the top level of the 
Cadence hierarchy in the Windows start menu.
Platform ID wint
Operating System Windows XP Professional (SP3 or later) 32-bit;Windows 7 
Enterprise, Ultimate, or Home Premium (32-bit and 64-bit); 
Windows Vista Enterprise, Business, Ultimate, or Home 
Premium (SP2 or later) (32-bit and 64-bit); Windows 2008 
Server (32-bit and 64-bit).
Note: Cadence SPB and OrCAD products do not support 
Windows XP 64-bit, Windows 7 Starter and Home Basic, and 
Windows Server 2003. In addition, Windows Server support 
does not include support for Windows Remote Desktop. 
Recommended Software Microsoft® Internet Explorer® 7.0 or later
Minimum Hardware Intel® Pentium® 4 or AMD Athlon XP 2000+
4 GB RAM
Virtual memory at least twice physical memory
50 GB free disk space
1,024 x 768 display resolution with true color (16bit color)
Broadband Internet connection for some service
Ethernet card (for network communications and security 
hostID)
Three-button Microsoft-compatible mouseOctober 2012 6 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsUsing Spaces in File and Directory Names
Support for spaces in file and directory names applies only to Windows. Spaces in file or 
directory names are not supported on UNIX platforms. Leading and trailing spaces in 
directory components are not supported.
Spaces in directory names are supported in the following areas:
■ Program installation location (C:\Program Files)
■ Default user home directory (C:\Document and Settings\). If you set the 
HOME environment variable, you override the default.
■ Default temporary directory (C:\Document and Settings\). If you set the 
TEMP or TMP environment variable, you override the default.
■ Your desktop directory (C:\Document and Settings\\Desktop)
■ Project location
■ Library locations
Spaces in filenames are not supported when a filename is stored in the design. For example, 
symbols and padstack names are stored in the Allegro database where a space is not legal. 
Ancillary space support is based upon each SPB application. Allegro PCB Editor supports 
spaces in filenames for non-design files. Files that fall into this category are reports and text 
files.
Recommended Hardware Intel® Core™ 2 Duo 2.66 GHz  or AMD Athlon 64 X2 5200+
For best performance, use a 64-bit capable CPU chip and a 
64-bit version of Windows 7.
4 GB RAM (32bit OS) and 8 GB RAM (64bit OS)
500 GB free disk space
1,280 x 1024 display resolution with true color (at least 32bit 
color)
A dedicated graphics card
For physical design dual monitors
Broadband Internet connection for some servicesOctober 2012 7 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsLinux System Requirements
This section describes the system requirements for Linux.
Note: If you are running SPB back-end tools, you must source
/tools/pcb/bin/cshrc (tcsh/csh) 
or 
/tools/pcb/bin/profile (sh/bash) 
or intergrate the equivalent Linux settings into your own environment files. It is not sufficient 
just to add SPB tools to the PATH variable.
Platform ID lnx86
Operating System RHEL 5.5 (64-bit) SP2; RHEL 6.0 (64-bit), SLES 10 (64-bit) SP2, 
and SLES 11 (64-bit) SP2
Hardware  Intel P4 compatibles (includes AMD Opteron), Intel P4 EMT and 
AMD Athlon
4 GB (or greater) system memory
8 GB swap space
10 GB (or greater) available disk space
TrueColor required
For information about graphics cards, see Graphics Requirements 
for Physical Design Products on page 13.
Window Manager GnomeOctober 2012 8 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsSolaris SparcSystem Requirements
This section describes the system requirements for Solaris.
Platform ID sun4v
Operating System Solaris 10
Hardware Sun UltraSparc or better.
4 GB (or greater) system memory
8 GB swap space
10 GB (or greater) available disk space
TrueColor required
For information about graphics cards, see Graphics Requirements 
for Physical Design Products on page 13.
Window Manager Common Desktop Environment (CDE) or GnomeOctober 2012 9 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsIBM AIX System Requirements
This section describes the system requirements for IBM AIX.
Platform ID ibmrs
Operating System AIX 6.1
Hardware POWER3 and PC_604
Note: Cadence SPB no longer supports Power2 and older 
machines. Run the lsattr -El proc0 command to check the 
CPU type; it should return a value containing the processor types 
listed above.
4 GB (or greater) system memory
8 GB swap space
10 GB (or greater) available disk space
TrueColor required
For information about graphics cards, see Graphics Requirements 
for Physical Design Products on page 13.
Window Manager Common Desktop Environment (CDE)
Backingstore needs to be enabled in the following manner:
1. Login as root.
2. Edit /usr/lpp/X11/defaults/xserverrc
3. Change the following line:
EXTENSIONS = “”
to read
EXTENSIONS = “-bs”
4. Reboot your machine.October 2012 10 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsImproving Performance on UNIX Systems
You may be able to greatly enhance your graphics performance on certain machines if you 
run both X and Cadence SPB products on the same machine. 
To run X and Cadence SPB products on the same machine, set the display variable to its local 
mode (type setenv DISPLAY  :0 at the command prompt). This lets the X protocol use 
shared memory instead of expensive TCP/IP transport. 
Displaying UI Dialog Boxes Correctly
If the secondary (child) dialog boxes disappear behind the main UI of Allegro PCB Editor, you 
need to modify the window manager to keep child windows on top.
■ For Solaris
The typical window manager default configuration is 
secondariesOnTop:False
❑ If you run CDE, add the following to your ~/.Xdefaults file
DTwm*secondariesOnTop:True
❑ If you want to restrict this behavior to certain programs, add the following to your
~/.Xdefaults file
DTwm**secondariesOnTop:True
For example:
DTwm*Allegro*secondariesOnTop:True
Add an entry to the file for each program. When finished, restart the window manager.
Non-Native X Emulators
Cadence tools only support the XServer provided by the OS platform vendors (Sun, Linux, 
and AIX). Non-native X solutions such as Hummingbird, Exceed, etc., are not supported. 
VNC to non-native X solutions is also not supported.
Virtual Environment Support
Cadence SPB has several products that require access to high performance graphic 
hardware. These applications rely on direct access, via drivers, to the capabilities of high-end October 2012 11 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System Requirementsgraphics cards to display, render and manipulate images on the screen. Products exist in both 
the Virtualization and Remote desktop areas that may or may not emulate these hardware 
functions. If these products emulate these graphical hardware functions, performance of the 
Cadence sofware will likely be poor. If these products do not emulate the APIs (Application 
Programming Interfaces) of the graphics hardware the software will not function.
Due to the restrictions inherent with virtual and remote desktop environments, Cadence does 
not test, certify, or support any of the graphical applications in any virtual environment. Virtual 
environments include, but are not limited to: Citrix, VMware, and Hyper-V. Remote desktop 
environments include but are not limited to: Remote Desktop (Windows), Hummingbird 
(Windows), Remote X Desktop (Linux and UNIX), and VNC based products (Windows and 
Linux/UNIX).
The Cadence advanced graphics programs list OpenGL as a requirement. To achieve best 
performance and quality users must download the latest graphics adapters provided by the 
hardware vendor of the card. The following is a list of the programs that require access to 
accelerated graphics adapters to operate:
■ Allegro PCB Editor
■ APD
■ SiP Layout
■ SigXp
■ Allegro Free and Plus viewers
The above listed products offer the ability to disable advanced graphics. This can be done 
temporarily by using the -noopengl command line argument or by permanently setting the 
set disable_opengl in the user's local Allegro env file. Running with OpenGL disabled 
will disable certain advanced product functionality such as 3D view modes and transparency.
While our applications will most likely install and operate in these environments, it has been 
demonstrated that performance is poor and advanced capabilities, such as 3D viewing may 
not work. Use of SPB graphical applications in these environments is not recommended and 
subject to these restrictions and caveats:
■ Cadence SPB products are not supported in a virtual or remote desktop environment. 
Customers use these environments at their own risk.
■ Performance may be so poor as to be unacceptable. Functionality that is based on 
advanced graphics hardware may not work.
■ Cadence will attempt to address issues reported in this environment but they must be 
reproduced on a supported workstation running in a non-virtual or non-remote desktop 
environment.October 2012 12 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsFinally certain remote meeting products such as Microsoft's NetMeeting do not properly 
display these SPB applications. Users should migrate to a remote meeting product where this 
is supported (example, Microsoft Live Meeting) or run the Cadence software with the 
advanced graphics disabled.
File Server Support
SPB supports loading the software on centralized file servers. The operating system used by 
a file server does not have to appear on the platform support matrix as long as the system is 
just used as a file server. For example, you can utilize a file server running Windows 2005 
(Windows) or Solaris 8 (UNIX) and this will be supported. If the file server is used for other 
purposes such as a license server, this function will need to meet our platform requirements.
SPB supports the following network file system protocols:
■ UNIX/Linux: NFS
■ Windows: SMB/CIFS. While open source Samba software provides SMB/CIFS,  SPB 
does not support Samba itself due to its many variations. Many customers run Samba 
shares without problems but you will need to duplicate tool problems in a supported 
environment.
Graphics Requirements for Physical Design Products
Most physical design products (such as Allegro PCB Editor, APD, SiP, and SI, but not Allegro 
PCB Router or SigXplorer) offer enhanced graphics via OpenGL. Front-end programs do not 
require OpenGL.
To use OpenGL as a graphics drawing option, your system must meet the following 
requirements:
■ A modern computer purchased within the last couple of years. 
■ A dedicated graphics card (motherboard-based) with hardware OpenGL support or an 
Intel 945 class graphics card. A  minimum of 128 MB dedicated (not shared) video RAM 
and a 128-bit bus interface (256 MB or more is recommended). We also recommend that 
the card be workstation certified. A high-end motherboard based graphics solution 
delivers acceptable performance for most designs.  This is one area where spending a 
bit for quality improves productivity.
■ A minimum of 1 GB system memory.
■ Installation of the latest graphics patches from the graphics card vendor.October 2012 13 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsImportant
As with most graphics support, you must ensure that the appropriate drivers are 
installed and properly configured on your system. If you use older versions, you may 
see glitches with the display of objects, poor performance, and other problems. In 
the case of Windows Vista, only DirectX is available from the initial installation, so 
you must obtain new drivers before you attempt to run SPB tools. Make sure that 
video cards for Linux have Linux drivers available.
Remote graphics are not supported. Examples include: 
■ Windows terminal services such as Citrix 
■ VNC based programs 
■ Remote X programs (for example: Hummingbird) 
■ Thin client solutions (for example: SunRays)
■ Remote X clients (for example: Sun to Sun)
As of Release 16.0, all SPB tools require at least 65000 colors. We no longer support 256- 
color mode (also known as 8-plane mode in the X window world). Unix/Linux Xservers must 
be configured to use the TrueColor model. 
Only the 2D mode is supported. OpenGL requires higher level graphics cards for best 
performance. On Solaris and AIX platforms, OpenGL requires TrueColor 24 bit graphic 
settings, and will not display all colors if the system defaults are 8 bit color.
OpenGL is enabled by default. You can disable it using the environment variable 
disable_opengl in the OpenGL category of the User Preferences Editor dialog box. 
Planning Hardware Purchases for Physical Design 
Products
The SPB product family includes products such as schematic capture and library design. 
These place higher demands on disk access and do not tend to need the fastest CPU 
available. However, most Allegro back-end products are CPU and memory-bound— 
especially true of the back-end products: Allegro PCB Editor, PCB Router, APD, and PCB SI. 
Therefore, Cadence recommends a faster CPU for these products.
Allegro products use both integer and floating point, so select a configuration that provides 
ample processing power in both areas. When choosing a machine, purchase one with the 
highest CPU rating. Because vendors are de-emphasizing their CPU clocking, use the October 2012 14 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System Requirementsvendors’ chip-naming convention. Alternatively, use a performance benchmark 
measurement. For example, the SPEC site (http://www.spec.org) lists the hardware 
results from multiple vendors.
If two systems have comparable ratings, purchase the system with the larger Level 2 cache, 
even if its ratings are slightly slower. Buying a top-end CPU usually also brings a system with 
the latest motherboard, bus architecture, and RAM hardware.
In the Windows environment, if the machine is recommended for gamers, it meets the needs 
of high-end physical implementation design. The exception to this rule is that for Allegro 
products, you do not need dedicated sound cards. A dedicated graphics card is 
recommended over a motherboard-based graphics card because motherboard cards share 
memory and bus access with the CPU.
Buy enough memory so you are not paging during your work. One gigabyte is a good starting 
point for average PCB designs but you may need to raise the total if you plan on auto-routing, 
signal integrity work, or multi-board simulation. A rule of thumb is to take a recently completed 
board, and your memory requirement would be: 
Memory requirements = 1000 Megs + (Design_Size_on_disk * 10)  
then round up to the next half gigabyte.
Example: If you have a 50 MB board, then you would need 2 Gbyte of memory.
If you plan on using centralized Cadence software, design, or library storage, a 100 Mbs 
network connection is recommended.
While SPB products do not require 64-bit CPUs, our tools perform better on the 64-bit 
architectures. Note that all modern CPUs are now 64-bit capable. The exception is that we do 
not support the Intel Itanium chip.
Some SPB products take advantage of multi-processors; we recommend at least 4 
processors (this can be either seperate cores, multi-cores or hyperthreading). 
■ On Windows, the second chip can remove the performance penalty that is imposed by 
Virus checkers, inventory management, and other overhead software that can be found 
installed on modern Windows systems. In this area, the Intel HT technology can help with 
Windows “overhead” processing.
■ On UNIX systems, graphics programs will achieve better performance due to the nature 
of the X-windows architecture. The additional CPUs also will allow you to run background 
processes, such as auto-routers and simulators.October 2012 15 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsIn the Intel CPU world, Intel, Xeons and AMD chips typically leapfrog each other on which is 
the top performer. You will have better performance using a 64-bit-capable chip over a 32-bit-
only CPU (excluding the Intel IPF chip).
If you are considering a laptop computer, look at the “workstation replacement” laptops, even 
though they are heavier and have less battery life than more conventional laptops.
Finally, when purchasing a new system, look at your future needs and not your current 
requirements.
Additional Recommendations for Allegro Package 
Designer and SiP Products
The Cadence 3D Design Viewer (standard in SiP, optional add-on for APD) requires an 
OpenGL-compliant video card (128 MB recommended minimum video memory).
As of Release 16.0, IC-Package co-design capability (available in Package Designer XL and 
SiP) is available only on the Solaris and Linux platforms. Likewise, since this capability works 
with the Encounter-based IC floor-planning technology, you should plan that systems running 
this capability have sufficient disk and memory space for the Encounter-based and Allegro 
portions of the applications, as well as sufficient disk space for the IC portions of your system 
designs.
Most  back-end programs such as Allegro PCB Editor, APD, SiP Layout, SigXp and SI but not 
SPECCTRA, offer the OpenGL drawing capability. Front-end programs (Design Entry HDL, 
and OrCAD Capture) do not require OpenGL capability.
To use OpenGL as a graphics display option, your system needs to meet the following 
requirements:
■ A modern computer purchased within the last couple of years.
■ A dedicated graphic card is recommended for the OpenGL based products. 
In smaller form-factor hardware such as notebooks, many motherboard based graphic 
controllers now deliver good to excellant performance for most designs. For the best 
performance, a dedicated graphics card is still recommended.
■ Apply the latest graphics patches from the graphics card vendor or PC supplier.
Note: On UNXI/Linux, all SPB products now require at least true color (65000 colors) . SPB 
no longer support 256 color mode (also know as 8 plane mode in the X window world). Unix/
Linux Xservers must be configured to use the TrueColor model. October 2012 16 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsCompiler Requirements
Microsoft Windows
Sun Solaris
Sun Sol86
Linux
Compiler: Visual Studio.Net 2005
Required Compiler 
Options:
32 bit compiler
8 byte structure alignment (-Zp8)
multi-thread dll (-MD)
cdecl calling convention (-Gd)
Compiler: Studio 12
Required Compiler 
Options:
32 bit compiler
8 byte structure alignment (-dalign)
multi-threaded (-D_REENTRANT)
Position independent code (-KPIC)
Required DLL Linker 
Options:
multi-threaded (-mt)
Compiler: Sun Studio 12
Required Compiler 
Options:
32 bit compiler
8 byte structure alignment (-dalign)
multi-threaded (-D_REENTRANT)
Position independent code (-KPIC)
Required DLL Linker 
Options:
multi-threaded (-mt)
Compiler: gcc/g++ 4.1.2October 2012 17 Product Version 16.6
Allegro Platform System Requirements
Allegro® Platform System RequirementsIBM AIX
Managing Licenses
All SPB tools support the use of an options file, which you can use to restrict user access 
and manage licensing beyond the limits of the license file. To have products return their 
licenses to the license pool when they are idle, SPB tools let you add a TIMEOUT line, which 
sets a maximum amount of time (in seconds) that a license can remain inactive, to the 
options file. The queing argument of the NOLOG line in the options file, however, is not 
supported. 
For more information about licensing and the options file, refer to the Cadence License 
Manager document.
Required Compiler 
Options:
32 bit compiler
position independent code (-m32 -fPIC)
Required DLL Linker 
Options:
-fPIC -shared
Compiler: VA 7.0
Required Compiler 
Options:
32 bit compiler
language level support (-qlanglvl=extended:redefmac)
C++ name mangling (-qnamemangling=v5)
Required DLL Linker 
Options:
-brtl -GOctober 2012 18 Product Version 16.6
Allegro Platform System RequirementsFrequently Asked Questions
This document contains the frequently asked questions (FAQ) about requirements and 
performance. To view the answer to any question, click on that question from the list below.
■ What will happen if disk minimums are not met?
■ Can you specify a true memory hard limit where Allegro will not run?
■ Can you be more specific on memory requirements?
■ Will adding more memory improve Allegro performance?
■ What other things may impact performance?
■ Will multiple core/CPUs improve Allegro performance?October 2012 19 Product Version 16.6
Allegro Platform System Requirements
Frequently Asked QuestionsWhat will happen if disk minimums are not met?
Answer: Nothing, the Cadence installer still does a comparison between the disk space 
requirements of the products you choose and the available disk space on the target partition 
and will refuse to install if free space requirements is not met. The minumum requirements, 
we specify includes both installation and some user working space.
Can you specify a true memory hard limit where Allegro will not run?
Answer: No, this is impossible since there are many factors involved. We have a calculator 
latter in this document that helps in estimating memory requirements based upon design size 
and tool functionality you plan on using but 4GB (32bit OS) and 8GB (64bit OS) will statisfy 
almost all users.
Can you be more specific on memory requirements?
Answer: Depends, for physical design the rule of thumb is to take the disk size of a 
completed board and triple it to learn your basic memory requirements. Then you give the OS 
its due (lets say 2MB) and that is your basic memory requirements.  Of course if you do SI 
simulations or run GRE  you need a lot more memory.
Given how cheap memory is today, I would just use 3GB on XP and 8 GB on Windows 7 64bit 
and allocate Virtual memory at least twice your physical. Since Allegro programs are 32bit 
program, the most memory we can address is 4GB. But if the system is memory rich, the OS 
can use additional memory to give the system a smoother overall feel by keeping running 
programs in memory and caching fequently accessed files.
Will adding more memory improve Allegro performance?   
Answer: No, Allegro programs do not look at the amount physical memory to adjust 
performance. If Allegro programs are not paging then adding addition memory will not 
improve performance. The programs assume that the OS can satisfy memory requests. It is 
the OS' job to manage, via virtual memory, a program's memory  requirements. When the OS 
can no longer satisfy a memory request, we typically give a low memory warning and exit. 
Failure of Cadence SPB products is not typically due to lack of memory.
What other things may impact performance?
Answer: Slow performance can be due to:October 2012 20 Product Version 16.6
Allegro Platform System Requirements
Frequently Asked Questions■ rogue programs, use a process manager and sort by CPU time to insure no unwanted 
programs are consuming CPU cycles.
■ On Windows, a mis-configured virsus checker may be that cause.
■ With schematic editors,if accessing designs or libraries overall the network WAN/LAN 
latency or congestion may be an issue. Also check if the file server is overloaded.
■ On Windows, presence of a IP protection tool may slow access to files.
■ For physical tools design set-up may be an issue so run Performance Advisor found 
under the Database Check command
Will multiple core/CPUs improve Allegro performance?
Answer: Almost everyone can benefit from having 2 processing units (this can be obtained 
via multi-core, multi-CPU or HyperThreading configurations). For physical design (brd, mcm 
or sip), 4 processing units is recommended but for dense designs or complex constraint rules 
more then 4 will units will improve peformance. For high-end SI Analysis tools, 8 or more 
processing units is recommended.October 2012 21 Product Version 16.6