> < ^ Date: Thu, 15 May 2003 15:10:52 +0200
> < ^ From: Dmitrii Pasechnik <d.pasechnik@twi.tudelft.nl >
^ Subject: Re: [memory (no subject was given)]

Dear GAP-Forum,

On Thu, May 15, 2003 at 12:41:25PM +0200, Vdovin Evgenii wrote:
> I tried to calculate character table of some groups (under Windows
> XP) but the GAP stops after some time telling "There is no enough
> memory. Press 'Enter' to quit the program". Can it be possible to
> use hard disk if RAM-memory is not sufficient? If it is so, how it
> can be done? Thanks in advance.
you should edit gap.bat file that starts up GAP for you,
and instead of "14" in "-m 14m" put the number of megabytes
that will be available for the process (putting there the total amount
of memory minus approx. 100-150 mb should be fine)

It could just be that your group is too big to be handled directly
by the Dixon-Schneider algorithm; for instance, on my machine
(PC, Linux with 1Gb of RAM) if I try this on the group 2^10:SL(5,2)
I run out of memory.
Can you compute the conjugacy classes of your group, to begin with?

Perhaps experts can explain more advanced and less memory-hungry
procedures (like adding characters one by one, e.g. when the character
table of a factorgroup is known)


PS. The memory management of GAP under Windows is somehow crippled, as it
communicates with Windows via an extra layer (Cygwin).

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