limit number of concurrent processes in trimreads, alignreads, and filterreads...

limit number of concurrent processes in trimreads, alignreads, and filterreads to 4 to help with memory issues

workflow/main.nf

@@ -176,7 +176,7 @@ process trimReads {
 
   tag "$sampleId-$replicate"
   publishDir "$outDir/${task.process}/${sampleId}", mode: 'copy'
-
+  maxForks 4
   input:
 
   set sampleId, reads, experimentId, biosample, factor, treatment, replicate, controlId from rawReads
@@ -210,7 +210,7 @@ process alignReads {
   queue '256GB,256GBv1'
   tag "$sampleId-$replicate"
   publishDir "$outDir/${task.process}/${sampleId}", mode: 'copy'
-
+  maxForks 4
   input:
 
   set sampleId, reads, experimentId, biosample, factor, treatment, replicate, controlId from trimmedReads
@@ -247,7 +247,7 @@ process filterReads {
   queue '128GB,256GB,256GBv1'
   tag "$sampleId-$replicate"
   publishDir "$outDir/${task.process}/${sampleId}", mode: 'copy'
-
+  maxForks 4
   input:
 
   set sampleId, mapped, experimentId, biosample, factor, treatment, replicate, controlId from mappedReads