I got message Killed from Composer

[SalimF]

Composer it didnt finish install I got message Killed

root@server:~/php-to-c-extension# composer    install  --profile
Do not run Composer as root/super user! See https://getcomposer.org/root for details
[6.0MB/0.00s] Loading composer repositories with package information
[6.3MB/0.19s] Updating dependencies (including require-dev)
Killed

I'm rungging 128/MB+128MB Swap OpenVS VPS server , I read this are relatted to memory limits , since Composer demands more momery , here is my VPS memory status

root@server:~/php-to-c-extension# free -m
             total       used       free     shared    buffers     cached
Mem:           128         35         92         10          0          4
-/+ buffers/cache:         31         96
Swap:            0          0          0