eldo_user

Running Eldo
Multi-Threading Eldo Simulations
activated for DC, transient, RF and AC simulations. Eldo makes use of all the possible CPUs on
the machine, sharing the work between the different CPUs to speed up simulation.
Multi-threading is activated with the Eldo command line argument:
eldo -use_proc n | HALF | MAX k | ALL | HYPER | LSF
You can specify the number of processors n, half the processors, a maximum of k processors, all
processors except Hyper-Threading, all processors including Hyper-Threading processors, or
align the number of processors with the resource provided by an LSF external dispatcher.
(Hyper-Threading is not recommended because in many cases it can slow down simulation, see
“Notes” on page 45.)
Tip
See the “-use_proc” command line argument in the Eldo Reference Manual.
The number of CPUs being used is displayed at the beginning of the simulation (TRAN) and is
recorded in the statistics, generated at the end of simulation.
You can specify the -cntthread argument to provide more details about the computer
architecture, for example:
• Bi-Xeon dual core with no Hyper-Threading
Number of physical processors : 2
+ Hyper-Threading Technology : disabled
+ Number of cpu cores : 4
+ Number of logical processors : 4
• Bi-Opteron
Number of physical processors : 2
+ Hyper-Threading Technology : N/A
+ Number of cpu cores : N/A
+ Number of logical processors : N/A
• Bi-Xeon (PIV) with Hyper-Threading
Number of physical processors : 2
+ Hyper-Threading Technology : enabled
+ Number of cpu cores : 0
+ Number of logical processors : 4
Tip
See the “-cntthread” command line argument in the Eldo Reference Manual.
Eldo will make use of the multi-thread capability of the machine it is running on only if all the
following conditions are met:
• The -use_proc argument has been set.
Eldo® User's Manual, 15.3 43