Prevent cpu scaling to improve hashing

conf/base.config

@@ -9,40 +9,33 @@
 */
 
 process {
-
-    // TODO nf-core: Check the defaults for all processes
-    cpus   = { 1      * task.attempt }
+    // CPUs are not scaled using task.attempt in order to improve resume performance
+    // In most use cases, the memory will be the limiting factor
+    cpus   = { 1                     }
     memory = { 6.GB   * task.attempt * params.memory_scale }
     time   = { 4.h    * task.attempt }
 
     errorStrategy = { task.exitStatus in ((130..145) + 104) ? 'retry' : 'finish' }
     maxRetries    = 1
     maxErrors     = '-1'
 
-    // Process-specific resource requirements
-    // NOTE - Please try and re-use the labels below as much as possible.
-    //        These labels are used and recognised by default in DSL2 files hosted on nf-core/modules.
-    //        If possible, it would be nice to keep the same label naming convention when
-    //        adding in your local modules too.
-    // TODO nf-core: Customise requirements for specific processes.
-    // See https://www.nextflow.io/docs/latest/config.html#config-process-selectors
     withLabel:process_single {
         cpus   = { 1                   }
         memory = { 6.GB * task.attempt * params.memory_scale }
         time   = { 4.h  * task.attempt }
     }
     withLabel:process_low {
-        cpus   = { 2     * task.attempt }
+        cpus   = { 2                    }
         memory = { 12.GB * task.attempt * params.memory_scale }
         time   = { 4.h   * task.attempt }
     }
     withLabel:process_medium {
-        cpus   = { 6     * task.attempt }
+        cpus   = { 6                    }
         memory = { 36.GB * task.attempt * params.memory_scale }
         time   = { 8.h   * task.attempt }
     }
     withLabel:process_high {
-        cpus   = { 12    * task.attempt }
+        cpus   = { 12                   }
         memory = { 72.GB * task.attempt * params.memory_scale }
         time   = { 16.h  * task.attempt }
     }