1 core works for under 100 users but the responsiveness might suffer
2 cores is the recommended number of cores and supports up to 100 users
4 cores supports about 1,000 users
8 cores supports up to 10,000 users
Memory
512MB is too little memory, GitLab will be very slow and you will need 250MB of swap
768MB is the minimal memory size but we advise against this
1GB supports up to 100 users (with individual repositories under 250MB, otherwise git memory usage necessitates using swap space)
2GB is the recommended memory size and supports up to 1,000 users
4GB supports up to 10,000 users
