Give more details on how to set vm.max_map_count

[gitbuda]

especially for the larger amounts of system memory

e.g. https://docs.actian.com/vector/5.0/User/Increase_max_map_count_Kernel_Parameter_(Linux).htm says "where map_count should be around 1 per 128 KB of system memory" For memgraph that number is probably different, but we should come with a table like:

• 128GB -> value
• 256GB -> value
• ...
• 2TB -> value
• 4TB -> value
• ...

[gitbuda]

@antoniofilipovic what are the recommended values for Memgraph depending on the available RAM under the system?

[antoniofilipovic]

I would recommend following also this link: https://docs.actian.com/vector/5.0/index.html#page/User/Increase_max_map_count_Kernel_Parameter_(Linux).htm link

Here are suggestions @kgolubic:

• From 8GB till 32GB RAM:

  echo "vm.max_map_count=262144" | sudo tee -a /etc/sysctl.conf

• For 64GB RAM:

  echo "vm.max_map_count=524288" | sudo tee -a /etc/sysctl.conf

• For 128GB RAM:

  echo "vm.max_map_count=1048576" | sudo tee -a /etc/sysctl.conf

• For 256GB RAM:

  echo "vm.max_map_count=2097152" | sudo tee -a /etc/sysctl.conf

• For 512GB RAM:

  echo "vm.max_map_count=4194304" | sudo tee -a /etc/sysctl.conf

• For 1TB RAM:

  echo "vm.max_map_count=8388608" | sudo tee -a /etc/sysctl.conf

• For 1.5TB RAM:

  
  echo "vm.max_map_count=12582912" | sudo tee -a /etc/sysctl.conf

• For 2TB RAM:

  echo "vm.max_map_count=16777216" | sudo tee -a /etc/sysctl.conf

• For 2.5TB RAM:

  echo "vm.max_map_count=20971520" | sudo tee -a /etc/sysctl.conf

• For 3TB RAM:

  echo "vm.max_map_count=25165824" | sudo tee -a /etc/sysctl.conf

• For 3.5TB RAM:

  echo "vm.max_map_count=29360128" | sudo tee -a /etc/sysctl.conf

• For 4TB RAM:

  echo "vm.max_map_count=33554432" | sudo tee -a /etc/sysctl.conf

Afterward, you need to run: sudo sysctl -p

[kgolubic]

We already have the info similar to the one that you referred to (https://docs.actian.com/vector/5.0/User/Increase_max_map_count_Kernel_Parameter_(Linux).htm ). Our docs are located at https://memgraph.com/docs/configuration/system-configuration#increasing-memory-map-areas an this is the place where I'll add this table.