add unlimited memory

tools/cd-hit/Snakefile

@@ -105,5 +105,5 @@ rule cd_hit:
         command = []
         if params.modules:
         	command.append("module load {params.modules}")
-        command.append("{params.exec_command} {params.options} -i {input} -T {threads} -o {output}")
+        command.append("{params.exec_command} {params.options} -i {input} -T {threads} -M 0 -o {output}")
         shell(" && ".join(command))