Merge pull request #4260 from vespa-engine/vekterli/use-10g-posting-l…

…ist-cache

Use max of 10 GiB posting list cache in test

tests/performance/mmap_vs_directio/mmap_vs_directio.rb

@@ -31,7 +31,7 @@ def test_profile
     else
       { :doc_count      => -1,
         :query_runtime  => 60,
-        :cache_sizes_mb => [0, 24, 256, 2 * 1024] }
+        :cache_sizes_mb => [0, 24, 256, 10 * 1024] }
     end
   end