In short if I start (with no config file no parameter no nothign) as a normal user it crashes...
If runned with strace I have before the end lot of
mmap2(NULL, 4194304, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 ENOMEM (Cannot allocate memory)
So I noticed this happen because 4Gb of memory got already dedicated to this process (which is 32 bit)
RES 3.950g
VIRT 4176060
If I run as root this problem is not present, memory usage is very, very low at start
VIRT RES
194352 92372
machine is Intel(R) Xeon(R) CPU E5-1630 v3 with 64Gb of memory and... 62Gb free.
I will try to dig some more