Compilation with dub + dmd: out of memory

[Mathias LANG via Digitalmars-d-learn]

On Tuesday, 10 February 2015 at 11:24:21 UTC, Vlasov Roman wrote:
> I have the quite computer with 2 GB RAM. At compilation with 
> dub and dmd of small project this pair eating about 1.4~1.5 GB 
> RAM. I solve this probleb by connecting swap partition, but it 
> calls some freezes + it take ~10% of swap, and after 
> compilation swap not released. At switching off swap as result 
> we get ~200 MB of "dead data" in RAM, which can be released by 
> rebooting. How i can resolve it?

First, if the program terminated, there is no dead data. Some 
might be shown as used with utilities as top, but running 'free' 
will probably show that your data is still "buffered", but 
available for other programs to use.
You can run this command to see the effect of dropping cache:
free && sync && echo 3 > /proc/sys/vm/drop_caches && free

Back to dub... DMD way of managing memory is fast, at the expense 
of memory. I could not really enjoy fast compile time on my 4 GB 
machine either, everything changed when I switched to 8 GB.
There is an option in dub to compile every object file 
separately, it's '--build-mode=singleFile'. However, it has no 
tracking of updated files (as make as), so it rebuild everything, 
everytime. It makes the whole process slower, but you can use it 
if you run out of memory (I compiled Vibe.d on a 512 MB machine 
few months ago).