launch_mapdl - ram

[nekajcasa]

Description of the modifications

I believe ram argument takes in GB and not MB as stated in the documentation.

Useful links and references

No response

[mikerife]

Hi @nekajcasa starting Mechanical APDL from the command line still uses MB in the memory allocation options (-m and -db). Do you have in mind the APDL command DSPOPTION?
Mike

[nekajcasa]

When I run the following command:

from ansys.mapdl.core import launch_mapdl
mapdl = launch_mapdl(ram=4)

I get the following output in file1.out:

MEMORY REQUESTED (MB)        = 4096

However, when I run:

from ansys.mapdl.core import launch_mapdl
mapdl = launch_mapdl(ram=4096)

the program exits with an error.
In file1.err, I get:

The memory (-m) size requested [4194304 mb] is not currently available. 
  Re-enter the MAPDL command line with less memory requested.

and in file1.out, I get:

MEMORY REQUESTED (MB)        = 4194304

From this, I assume that the ram argument takes GB instead of MB as input, which contradicts the documentation:

MAPDL Documentation

ram (float, optional)
Total size in megabytes of the workspace (memory) used for the initial allocation. The default is None, in which case 2 GB (2048 MB) is used. To force a fixed size throughout the run, specify a negative number.

[mikerife]

Hi @nekajcasa @germa89
I snuck a peek at the code for launch_mapdl and yep it multiplies the 'ram' value by 1024. Which is either a mistake or the PyMAPDL documentation needs to be updated to be clear that the value is (integer) GB.
MIke