adjust num_chunks after fixing bug in PR #152.

Signed-off-by: Steven Hahn <hahnse@ornl.gov>

Author: quantumsteve

bin/wfbench

@@ -387,8 +387,8 @@ def compute_num_chunks(time_limit, cpu_work, gpu_work, num_chunks):
     # Compute the (feasible number of chunks)
     min_chunk_size_time = 1 # At least 1 second per chunk, if we're doing time-based
     # TODO: Pick reasonable factors below so that a chunk takes about min_chunk_size_time sec on a reasonable machine
-    min_chunk_size_cpu_work = 3000000 * min_chunk_size_time  # 1s on my MacBook Pro
-    min_chunk_size_gpu_work = 30000000 * min_chunk_size_time # unknown.....
+    min_chunk_size_cpu_work = 200 * min_chunk_size_time  # 1s on my MacBook Pro
+    min_chunk_size_gpu_work = 2000 * min_chunk_size_time # unknown.....
 
     if time_limit:
         num_chunks = min(num_chunks, time_limit // min_chunk_size_time)