X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=preclustercommand.cpp;h=05c8b7d42a1ba7de160449f02707097800357bea;hb=250e3b11b1c9c1e1ad458ab6c7e71ac2e67e11d9;hp=fbbe4bb3a2fc5c99f77875292849e0a0e95f1043;hpb=a935b75dd890da5ae7f09e5e6179f90ab2955348;p=mothur.git

diff --git a/preclustercommand.cpp b/preclustercommand.cpp
index fbbe4bb..05c8b7d 100644
--- a/preclustercommand.cpp
+++ b/preclustercommand.cpp
@@ -300,6 +300,7 @@ int PreClusterCommand::execute(){
 			m->mothurOut("It took " + toString(time(NULL) - start) + " secs to run pre.cluster."); m->mothurOutEndLine(); 
 				
 		}else {
+            if (processors != 1) { m->mothurOut("When using running without group information mothur can only use 1 processor, continuing."); m->mothurOutEndLine(); processors = 1; }
 			if (namefile != "") { readNameFile(); }
 		
 			//reads fasta file and return number of seqs
@@ -368,13 +369,15 @@ int PreClusterCommand::createProcessesGroups(string newFName, string newNName, s
 		
 		//divide the groups between the processors
 		vector<linePair> lines;
-		int numGroupsPerProcessor = groups.size() / processors;
-		for (int i = 0; i < processors; i++) {
-			int startIndex =  i * numGroupsPerProcessor;
-			int endIndex = (i+1) * numGroupsPerProcessor;
-			if(i == (processors - 1)){	endIndex = groups.size(); 	}
-			lines.push_back(linePair(startIndex, endIndex));
-		}
+		int remainingPairs = groups.size();
+        int startIndex = 0;
+        for (int remainingProcessors = processors; remainingProcessors > 0; remainingProcessors--) {
+            int numPairs = remainingPairs; //case for last processor
+            if (remainingProcessors != 1) { numPairs = ceil(remainingPairs / remainingProcessors); }
+            lines.push_back(linePair(startIndex, (startIndex+numPairs))); //startIndex, endIndex
+            startIndex = startIndex + numPairs;
+            remainingPairs = remainingPairs - numPairs;
+        }
 		
 #if defined (__APPLE__) || (__MACH__) || (linux) || (__linux) || (__linux__) || (__unix__) || (__unix)