Set the SF16 reference Nps using SF11 as base

Fishtest with Stockfish 11 had 1.6MNps as reference Nps and 0.7MNps as
threshold for the slow worker.
Set the new reference Nps according to the 26% slowdown
of the SF 16 wrt SF 11 on the ARCH=x86-64-bmi2.
Set the new threshold for slow worker according to the 34% slowdown
of the SF 16 wrt SF 11 on the ARCH=x86-64-modern (x86-64-sse41-popcnt).

compiler clang++ 16.0.6

- arch=bmi2 (Intel Xeon CPU E5-2680 v3)
```
sf_base =  1580934 +/-  12410 (95%)
sf_test =  1163656 +/-   7679 (95%)
diff    =  -417278 +/-  11547 (95%)
speedup = -26.394% +/- 0.730% (95%
```

- arch=modern (Intel core i7 3770k)
```
sf_base =  1865978 +/-  14061 (95%)
sf_test =  1228350 +/-  11701 (95%)
diff    =  -637627 +/-   5230 (95%)
speedup = -34.171% +/- 0.280% (95%)
```

Raise worker version to 206, also server side.

server/fishtest/api.py

@@ -25,7 +25,7 @@
 on how frequently the main instance flushes its run cache.
 """
 
-WORKER_VERSION = 205
+WORKER_VERSION = 206
 
 
 def validate_request(request):

server/fishtest/rundb.py

@@ -523,7 +523,7 @@ def aggregate_unfinished_runs(self, username=None):
                     nps += concurrency * task["worker_info"]["nps"]
                     if task["worker_info"]["nps"] != 0:
                         games_per_minute += (
-                            (task["worker_info"]["nps"] / 1328000.0)
+                            (task["worker_info"]["nps"] / 1184000)
                             * (60.0 / estimate_game_duration(run["args"]["tc"]))
                             * (
                                 int(task["worker_info"]["concurrency"])

server/utils/delta_update_users.py

@@ -44,10 +44,10 @@ def initialize_info(rundb, clear_stats):
 
 
 def compute_games_rates(rundb, info_tuple):
-    # 1328000 nps is the reference core, also sets in views.py and game.py
+    # 1184000 nps is the reference core, also set in rundb.py and games.py
     for machine in rundb.get_machines():
         games_per_hour = (
-            (machine["nps"] / 1328000.0)
+            (machine["nps"] / 1184000)
             * (3600.0 / estimate_game_duration(machine["run"]["args"]["tc"]))
             * (int(machine["concurrency"]) // machine["run"]["args"].get("threads", 1))
         )

worker/games.py

@@ -1290,14 +1290,15 @@ def parse_options(s):
         games_concurrency * threads,
     )
 
-    if base_nps < 434000 / (1 + math.tanh((worker_concurrency - 1) / 8)):
+    if base_nps < 462000 / (1 + math.tanh((worker_concurrency - 1) / 8)):
         raise FatalException(
             "This machine is too slow ({} nps / thread) to run fishtest effectively - sorry!".format(
                 base_nps
             )
         )
-    # 1328000 nps is the reference core, also set in views.py and delta_update_users.py
-    factor = 1328000 / base_nps
+    # 1184000 nps is the reference core benched with respect to SF 11,
+    # also set in rundb.py and delta_update_users.py
+    factor = 1184000 / base_nps
 
     # Adjust CPU scaling.
     _, tc_limit_ltc = adjust_tc("60+0.6", factor)

worker/sri.txt

@@ -1 +1 @@
-{"__version": 205, "updater.py": "PHFUVXcoxBFiW2hTqFN5q5WdAw2pK8uzFC7hyMUC3cLY5bGZPhL8TBGThtqDmcXd", "worker.py": "cCyr244zHs0k/Uur7lQlXSCsmGwCT7L+bSxrH4kLB6Dol2AsUCz/Lg+Bo2VPgQVk", "games.py": "bK3SvG/8oGKOZlgT4oczbfgzOS6LMOesBKWWVI4P74z1cMJB9C2cqqas7U42XO3x"}
+{"__version": 206, "updater.py": "PHFUVXcoxBFiW2hTqFN5q5WdAw2pK8uzFC7hyMUC3cLY5bGZPhL8TBGThtqDmcXd", "worker.py": "R8rJ4c9ZQTbuSu80ayVyMs7D6/TOVR5qMn6R04XCsBp4BTkCKXfy7hSrpMaLa0nX", "games.py": "D+5sFwptbwAhvn+VM4oHyRwqUPfGUWLQPFbWHA/uK77rTUsU/r49gBMjjz6k5Ncq"}

worker/worker.py

@@ -54,7 +54,7 @@
 # Several packages are called "expression".
 # So we make sure to use the locally installed one.
 
-WORKER_VERSION = 205
+WORKER_VERSION = 206
 FILE_LIST = ["updater.py", "worker.py", "games.py"]
 HTTP_TIMEOUT = 30.0
 INITIAL_RETRY_TIME = 15.0