Sch: Fix worker_time_pressure access of dead worker

Author: jpsamaroo

Diff for: src/sch/Sch.jl

@@ -324,9 +324,6 @@ function init_proc(state, p, log_sink)
     gproc = OSProc(p.pid)
     lock(state.lock) do
         state.worker_time_pressure[p.pid] = Dict{Processor,UInt64}()
-        for proc in get_processors(gproc)
-            state.worker_time_pressure[p.pid][proc] = 0
-        end
 
         state.worker_storage_pressure[p.pid] = Dict{Union{StorageResource,Nothing},UInt64}()
         state.worker_storage_capacity[p.pid] = Dict{Union{StorageResource,Nothing},UInt64}()
@@ -769,7 +766,9 @@ function schedule!(ctx, state, procs=procs_to_use(ctx))
                         Vector{Tuple{Thunk,<:Any,<:Any,UInt64,UInt32}}()
                     end
                     push!(proc_tasks, (task, scope, est_time_util, est_alloc_util, est_occupancy))
-                    state.worker_time_pressure[gproc.pid][proc] += est_time_util
+                    state.worker_time_pressure[gproc.pid][proc] =
+                        get(state.worker_time_pressure[gproc.pid], proc, 0) +
+                        est_time_util
                     @dagdebug task :schedule "Scheduling to $gproc -> $proc"
                     @goto pop_task
                 end

Diff for: src/sch/util.jl

@@ -457,7 +457,8 @@ function estimate_task_costs(state, procs, task, inputs)
         tx_cost = impute_sum(affinity(chunk)[2] for chunk in chunks_filt)
 
         # Estimate total cost to move data and get task running after currently-scheduled tasks
-        costs[proc] = state.worker_time_pressure[get_parent(proc).pid][proc] + (tx_cost/tx_rate)
+        est_time_util = get(state.worker_time_pressure[get_parent(proc).pid], proc, 0)
+        costs[proc] = est_time_util + (tx_cost/tx_rate)
     end
 
     # Shuffle procs around, so equally-costly procs are equally considered