postgresql: increase shared_buffers size

fort-nix · Jul 6, 2022 · c4ff3fa · c4ff3fa
1 parent 01f369d
commit c4ff3fa
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diff --git a/deployment/deploy.sh b/deployment/deploy.sh
@@ -99,6 +99,9 @@ ssh nixbitcoin.org :
 # Remount already formatted storage
 # <2-format-storage.sh ssh nixbitcoin.org 'bash -s remount'
 
+# Determine and set `memorySizeGiB` in ../hardware.nix
+ssh nixbitcoin.org free --gibi | awk '/Mem:/ { print $2 }'
+
 # Optional: Generate config to update ../hardware.nix
 makeConfig() {(
   set -euxo pipefail

diff --git a/hardware.nix b/hardware.nix
@@ -3,6 +3,8 @@
 { config, lib, pkgs, modulesPath, ... }:
 
 let
+  memorySizeGiB = 64;
+
   hetznerDedicated = {
     boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "sd_mod" ];
     boot.kernelModules = [ "kvm-amd" ];
@@ -78,4 +80,9 @@ in
       { path = "/boot2"; devices = [ "/dev/sdb" ]; }
     ];
   };
+
+  services.postgresql.settings.shared_buffers = let
+    size = memorySizeGiB / 4;
+  in
+    assert size >= 1; "${toString size}GB";
 }