SSprofiler

code/controllers/configuration.dm

@@ -272,6 +272,9 @@
 	/// Max amount of CIDs that one ckey can have attached to them before they trip a warning
 	var/max_client_cid_history = 3
 
+	/// Enable auto profiler of rounds
+	var/auto_profile = FALSE
+
 /datum/configuration/New()
 	for(var/T in subtypesof(/datum/game_mode))
 		var/datum/game_mode/M = T
@@ -765,6 +768,8 @@
 					centcom_ban_db_url = value
 				if("max_client_cid_history")
 					max_client_cid_history = text2num(value)
+				if("enable_auto_profiler")
+					auto_profile = TRUE
 				else
 					log_config("Unknown setting in configuration: '[name]'")
 

code/controllers/subsystem/profiler.dm

@@ -0,0 +1,48 @@
+SUBSYSTEM_DEF(profiler)
+	name = "Profiler"
+	init_order = INIT_ORDER_PROFILER
+	runlevels = RUNLEVELS_DEFAULT | RUNLEVEL_LOBBY
+	wait = 3000
+	flags = SS_NO_TICK_CHECK
+	var/fetch_cost = 0
+	var/write_cost = 0
+
+/datum/controller/subsystem/profiler/stat_entry()
+	..("F:[round(fetch_cost,1)]ms | W:[round(write_cost,1)]ms")
+
+/datum/controller/subsystem/profiler/Initialize()
+	if(!config.auto_profile)
+		StopProfiling() //Stop the early start profiler if we dont want it on in the config
+	return ..()
+
+/datum/controller/subsystem/profiler/fire()
+	if(config.auto_profile)
+		DumpFile()
+
+/datum/controller/subsystem/profiler/Shutdown()
+	if(config.auto_profile)
+		DumpFile()
+	return ..()
+
+// These procs may seem useless, but they exist like this so we can proc call them on and off
+// You cant proc-call onto /world
+/datum/controller/subsystem/profiler/proc/StartProfiling()
+	world.Profile(PROFILE_START)
+
+/datum/controller/subsystem/profiler/proc/StopProfiling()
+	world.Profile(PROFILE_STOP)
+
+// Write the file while also cost tracking
+/datum/controller/subsystem/profiler/proc/DumpFile()
+	var/timer = TICK_USAGE_REAL
+	var/current_profile_data = world.Profile(PROFILE_REFRESH,format="json")
+	fetch_cost = MC_AVERAGE(fetch_cost, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))
+	CHECK_TICK
+	if(!length(current_profile_data)) //Would be nice to have explicit proc to check this
+		stack_trace("Warning, profiling stopped manually before dump.")
+	var/json_file = file("[GLOB.log_directory]/profile.json")
+	if(fexists(json_file))
+		fdel(json_file)
+	timer = TICK_USAGE_REAL
+	WRITE_FILE(json_file, current_profile_data)
+	write_cost = MC_AVERAGE(write_cost, TICK_DELTA_TO_MS(TICK_USAGE_REAL - timer))