gunicorn: print config on startup

Makefile

@@ -67,7 +67,7 b' dev-srv:'
 .PHONY: dev-srv-g
 ## run gunicorn multi process workers
 dev-srv-g:
-	gunicorn --workers=4 --paste .dev/dev.ini --bind=0.0.0.0:10010 --worker-class=sync --threads=1 --config=configs/gunicorn_config.py --timeout=120
+	gunicorn --workers=4 --paste .dev/dev.ini --bind=0.0.0.0:10010 --config=.dev/gunicorn_config.py
 
 # Default command on calling make
 .DEFAULT_GOAL := show-help

configs/gunicorn_config.py

@@ -116,13 +116,14 b' keepalive = 2'
 # graceful restart signal 0 = memory monitoring is disabled
 # Examples: 268435456 (256MB), 536870912 (512MB)
 # 1073741824 (1GB), 2147483648 (2GB), 4294967296 (4GB)
+# Dynamic formula 1024 * 1024 * 256 == 256MBs
 memory_max_usage = 0
 
 # How often in seconds to check for memory usage for each gunicorn worker
 memory_usage_check_interval = 60
 
 # Threshold value for which we don't recycle worker if GarbageCollection
-# frees up enough resources. Before each restart we try to run GC on worker
+# frees up enough resources. Before each restart, we try to run GC on worker
 # in case we get enough free memory after that, restart will not happen.
 memory_usage_recovery_threshold = 0.8
 
@@ -229,6 +230,9 b' def pre_exec(server):'
 def on_starting(server):
     server_lbl = '{} {}'.format(server.proc_name, server.address)
     server.log.info("Server %s is starting.", server_lbl)
+    server.log.info('Config:')
+    server.log.info(f"\n{server.cfg}")
+    server.log.info(get_memory_usage_params())
 
 
 def when_ready(server):