try with larger VirtualFile cache size and larger page cache size

no meaningful difference in startup time, iops, cpu utilization

Could either be because synchronous IO is the bottleneck,
or because we're artificially limiting the parallelism through
the semaphore.

benchmarked_ps_config.toml

@@ -15,7 +15,9 @@ control_plane_api ='http://127.0.0.1:15002/'
 #wait_lsn_timeout = '60 s'
 #wal_redo_timeout = '60 s'
 
-#max_file_descriptors = 100
+max_file_descriptors = 10000
+page_cache_size = 524288
+
 
 # initial superuser role name to use when creating a new tenant
 #initial_superuser_name = 'cloud_admin'