From 7a6bbf8c533011850dc06fae94c7e0487133582e Mon Sep 17 00:00:00 2001
From: Michael Barry <msbarry@users.noreply.github.com>
Date: Thu, 3 Mar 2022 07:25:24 -0500
Subject: [PATCH] Warn when running with insufficient memory or disk space
 (#73)

---
 .../planetiler/basemap/BasemapProfile.java     | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/src/main/java/com/onthegomap/planetiler/basemap/BasemapProfile.java b/src/main/java/com/onthegomap/planetiler/basemap/BasemapProfile.java
index f5a8308..bcf1107 100644
--- a/src/main/java/com/onthegomap/planetiler/basemap/BasemapProfile.java
+++ b/src/main/java/com/onthegomap/planetiler/basemap/BasemapProfile.java
@@ -182,6 +182,24 @@ public class BasemapProfile extends ForwardingProfile {
     return OpenMapTilesSchema.VERSION;
   }
 
+  @Override
+  public long estimateIntermediateDiskBytes(long osmFileSize) {
+    // in late 2021, a 60gb OSM file used 200GB for intermediate storage
+    return osmFileSize * 200 / 60;
+  }
+
+  @Override
+  public long estimateOutputBytes(long osmFileSize) {
+    // in late 2021, a 60gb OSM file generated a 100GB output file
+    return osmFileSize * 100 / 60;
+  }
+
+  @Override
+  public long estimateRamRequired(long osmFileSize) {
+    // 30gb for a 60gb OSM file is generally safe, although less might be OK too
+    return osmFileSize / 2;
+  }
+
   /**
    * Layers should implement this interface to subscribe to elements from <a href="https://www.naturalearthdata.com/">natural
    * earth</a>.