Hi Andrey

I can confirm that sage-6.6 was built successfully on an 8 year old pentium 
with 2GB of RAM and about 10 GB of swap, I was looking from time to time at 
the swap use during the ~15 hours built, I think almost 3GB was the top.

This was done with Debian Jessie, which I have to say, is the most stable 
OS I have ever seen, the whole machine was incredible slow during the built 
of sage, but in the end, everything (not only the sage built) was done as 
expected.
I guess my Windows XP from 10 years ago would have completely frozen every 
10 seconds ;-)

Greetings, Georg




On Monday, April 20, 2015 at 6:33:24 PM UTC+2, Andrey Novoseltsev wrote:
>
> Hello,
>
> Up to Sage-6.5 I was able to build it on my old laptop with 2GB RAM. It 
> has swap as well, but I don't think it was used much, the wall time was 
> just a bit bigger than user+system, about 8-9 hours.
>
> With Sage-6.6 it gets stuck while processing rings directory: swap is not 
> full yet, but it seems that necessary stuff does not fit RAM anymore - 
> heavy disk usage, low CPU temperature, not much progress after more than a 
> day, top was showing "python setup.py" if I recall correctly consuming 
> 1.5GB RAM and over 2.5GB virtual memory. This consistent over several 
> attempts with "make distclean", with nothing running apart from MATE 
> session and a terminal window.
>
> I realize that supporting builds on such computers may not be a high 
> priority, if at all, but perhaps it is a manifestation of some bug.
>
> Besides, while 2GB total RAM seems small nowadays, 2GB/core is quite 
> common, especially with VMs. (In fact, all physical and virtual machines 
> that I use frequently happen to have exactly this number, ranging from 
> 2GB/1 core to 32GB/16 cores.)
>
> Thank you,
> Andrey
>

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