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Memory Management in SKILL

vramanax

Hi 

I am working on a huge coding project, basically it is going to add route keepout on differential structures based on some rules.

In this case the database is 180MB+ and the number of individual operations(axl shape add to be exact) is around 100000+.

Now the question is how do I handle this, the program seems to work for smaller designs but at this level it fails complaining that Allegro ran out of memory.

I am sorry if it is vague, the point is I have tried everything, turning off online DRC, set dynamic shape to off and turned off all the DRC modes

I am going to try axlDBCloak and may be axlDBMemoryReclaim() in the mix and see if it improves.

Basically my function will grab individual pairs of differential structures and add route keepout based on a set of rule, I have to process them individually since every one of them can be unique (depends on the cline escape, pitch, via size etc..)

Regards

Venkata

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  • I have written some very similar code, possibly for the same reason, and had exactly the same problems.

    Until Allegro is 64bit this will be something you will have to manage by optimising memory usage in your code. Cloaking does help.

    I did find that using a 64bit machine with plenty of RAM did make a difference because most of the 4GB is available for use (unlike a 32bit machine).

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  • I have written some very similar code, possibly for the same reason, and had exactly the same problems.

    Until Allegro is 64bit this will be something you will have to manage by optimising memory usage in your code. Cloaking does help.

    I did find that using a 64bit machine with plenty of RAM did make a difference because most of the 4GB is available for use (unlike a 32bit machine).

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