added configuration option for maxmimum load and minimum ram for

postprocessing

defaults/yacy.init

@@ -1231,3 +1231,7 @@ browser.load4everyone = false
 # with some heuristics like: loading linked documents and adding a twitter search.
 # When the learning mode is finished, the user may switch on individual heuristics by himself.
 greedylearning.active = true
+
+# postprocessing steering
+postprocessing.maximum_load = 2.5
+postprocessing.minimum_ram = 536870912

source/net/yacy/search/Switchboard.java

@@ -2307,8 +2307,8 @@ public final class Switchboard extends serverSwitch {
                 boolean postprocessing =
                         collection1Configuration.contains(CollectionSchema.process_sxt) &&
                         (index.connectedCitation() || fulltext.useWebgraph()) &&
-                        MemoryControl.available() > 512L * 1024L * 1024L &&
+                        MemoryControl.available() > getConfigLong("postprocessing.minimum_ram", 0) &&
-                        Memory.load() < 2.5f;
+                        Memory.load() < getConfigFloat("postprocessing.maximum_load", 0);
                         
                 if (allCrawlsFinished) {
                     if (postprocessing) {