proc/meminfo

Hello, I want to know if i change some values in proc/,e,info file in ubuntu, then will it take the new values? can it lead to system crash? I know its read-only file but we can change permission and can write there, but it shows warning while doinfg so, and i also know that this file is inititally populated during OS installation. But say I want to fool my system by mentioning greater RAM than is available to check the performane of some software in that case, the essence is that, that s/w would not be using memory in real time but will be only using the values for some planning.
So in short editing the values in proc/meminfo can lead to system crash? Will it take the new values and perform things accordingly?
Hoping somebody might help me...!