Wrong os.clock() result for MacOS m1

[ze0nni]

trafficstars

os.clock() return seconds with wrong scale

To Reproduce (REQUIRED)

1. create script

function update()
    print(os.clock());
end

2. run3.

Expected behavior (REQUIRED) Return time in seconds

Defold version (REQUIRED):

• Version 1.3.0 and 1.2.192

Platforms (REQUIRED):

• Platforms: MacOS m1 editor

https://www.youtube.com/watch?v=rc7QtML3-Mw

[britzl]

Is this really specific to the M1? It seems like clock() produces a different value on macOS compared to Windows and Linux.

https://stackoverflow.com/questions/16697005/clock-and-clocks-per-sec-on-osx-10-7

Or could it be that CLOCKS_PER_SEC is wrong on M1?

[JCash]

Two questions:

• Does it work correctly on an M1 using Lua 5.4?
• How does it compare to socket.gettime()

[britzl]

Running this with Lua 5.4 from a terminal actually yield the correct results:

for i=1,100 do
	print(os.clock())
	local t = os.time()
	while os.time() == t do
	end
end

I see a new number every second or so.

[britzl]

Or simplifed:

for i=1,100 do
	local c = os.clock()
	print(c)
	local t = math.floor(c)
	while math.floor(os.clock()) == t do
	end
end

[ze0nni]

for first code 1 have this output:

for i=1,20 do
	print(os.clock())
	local t = os.time()
	while os.time() == t do
	end
end

DEBUG:SCRIPT: 0.167582
DEBUG:SCRIPT: 0.386283
DEBUG:SCRIPT: 1.399068
DEBUG:SCRIPT: 2.406746
DEBUG:SCRIPT: 3.419945
DEBUG:SCRIPT: 4.440478
DEBUG:SCRIPT: 5.460063
DEBUG:SCRIPT: 6.472191
DEBUG:SCRIPT: 7.485179
DEBUG:SCRIPT: 8.49776
DEBUG:SCRIPT: 9.516492
DEBUG:SCRIPT: 10.535626
DEBUG:SCRIPT: 11.548969
DEBUG:SCRIPT: 12.561566
DEBUG:SCRIPT: 13.574475
DEBUG:SCRIPT: 14.59381
DEBUG:SCRIPT: 15.611856
DEBUG:SCRIPT: 16.624258
DEBUG:SCRIPT: 17.636988
DEBUG:SCRIPT: 18.649969

When i run

function init(self)	
	self.t = 0;
end

function update(self, dt)
	self.t = self.t + dt;
	print(os.clock(), self.t)
end

I have

DEBUG:SCRIPT: 0.171484	0.033333335071802
DEBUG:SCRIPT: 0.173843	0.050000002607703
DEBUG:SCRIPT: 0.176924	0.066666670143604
DEBUG:SCRIPT: 0.179228	0.083333337679505
DEBUG:SCRIPT: 0.181357	0.10000000521541
DEBUG:SCRIPT: 0.183559	0.11666667275131
DEBUG:SCRIPT: 0.185966	0.13333334028721
DEBUG:SCRIPT: 0.188358	0.15000000782311
DEBUG:SCRIPT: 0.191031	0.16666667535901
DEBUG:SCRIPT: 0.193158	0.18333334289491
DEBUG:SCRIPT: 0.195606	0.20000001043081
DEBUG:SCRIPT: 0.198345	0.21666667796671
DEBUG:SCRIPT: 0.201115	0.23333334550261
DEBUG:SCRIPT: 0.203612	0.25000001303852
DEBUG:SCRIPT: 0.209906	0.26666668057442
DEBUG:SCRIPT: 0.21243	0.28333334811032
DEBUG:SCRIPT: 0.214832	0.30000001564622
DEBUG:SCRIPT: 0.217598	0.31666668318212
DEBUG:SCRIPT: 0.220295	0.33333335071802
DEBUG:SCRIPT: 0.22328	0.35000001825392
DEBUG:SCRIPT: 0.226013	0.36666668578982
DEBUG:SCRIPT: 0.228445	0.38333335332572
DEBUG:SCRIPT: 0.231316	0.40000002086163
DEBUG:SCRIPT: 0.234052	0.41666668839753
DEBUG:SCRIPT: 0.236349	0.43333335593343
DEBUG:SCRIPT: 0.238104	0.45000002346933
DEBUG:SCRIPT: 0.240087	0.46666669100523
DEBUG:SCRIPT: 0.242559	0.48333335854113
DEBUG:SCRIPT: 0.244147	0.50000002607703
DEBUG:SCRIPT: 0.245737	0.51666669361293
DEBUG:SCRIPT: 0.247588	0.53333336114883
DEBUG:SCRIPT: 0.24942	0.55000002868474
DEBUG:SCRIPT: 0.251238	0.56666669622064
DEBUG:SCRIPT: 0.253747	0.58333336375654
DEBUG:SCRIPT: 0.255287	0.60000003129244
DEBUG:SCRIPT: 0.257157	0.61666669882834
DEBUG:SCRIPT: 0.259654	0.63333336636424
DEBUG:SCRIPT: 0.262372	0.65000003390014
DEBUG:SCRIPT: 0.265063	0.66666670143604
DEBUG:SCRIPT: 0.267607	0.68333336897194
DEBUG:SCRIPT: 0.270232	0.70000003650784
DEBUG:SCRIPT: 0.272732	0.71666670404375
DEBUG:SCRIPT: 0.275057	0.73333337157965
DEBUG:SCRIPT: 0.277403	0.75000003911555
DEBUG:SCRIPT: 0.279531	0.76666670665145
DEBUG:SCRIPT: 0.281844	0.78333337418735
DEBUG:SCRIPT: 0.283397	0.80000004172325
DEBUG:SCRIPT: 0.285105	0.81666670925915
DEBUG:SCRIPT: 0.286929	0.83333337679505
DEBUG:SCRIPT: 0.288634	0.85000004433095
DEBUG:SCRIPT: 0.290572	0.86666671186686
DEBUG:SCRIPT: 0.292375	0.88333337940276
DEBUG:SCRIPT: 0.294216	0.90000004693866
DEBUG:SCRIPT: 0.29615	0.91666671447456
DEBUG:SCRIPT: 0.29871	0.93333338201046
DEBUG:SCRIPT: 0.301453	0.95000004954636
DEBUG:SCRIPT: 0.303729	0.96666671708226
DEBUG:SCRIPT: 0.306071	0.98333338461816
DEBUG:SCRIPT: 0.308367	1.0000000521541

I not sure this is M1 specific bug. I have two m1 MacBook and one PC. On PC its work good

[ze0nni]

If I run project as HTML5 bundle -- problem not repeated

[ze0nni]

socket.gettime() work correct

[ze0nni]

Run on Lua.5.4.4 from homebrew. Looks like all correct

while true do
        print(os.clock())
end