Topic: Braiins OS & Braiins OS+ custom ASIC firmware: optimize performance & efficiency - page 33. (Read 45390 times)

Is it possible to set constant fan speed in BOS for S9, my fan just keeps on spinning up and down every few minutes?
Rest running very stable.

nothing but problems since trying to upgrade to the latest, now my test machine is on the factory reset braiin os, and you cannot do shit with it --you cannot upgrade, you cannot just revert back to the bitmain firmware. my mind is going to fucking blow up

Does it work on the s9 hydro?

TKS

Worked like a charm!!! Thanks a lot!

BR.
Steff

Edit:
I needed to restart cron before I got it to work (as written in BOS scheduled tasks window), but after a little googling I got that fixed by logging on to the miner with Putty and writing the command "service cron restart".

I write this edit also because of another thing. With original firmware I always stopped my miner (when needed) with putty and the command "poweroff". Then it stopped mining, but fans kept running so that it cooled down before unplugging.

This doesn't seem to work with BOS. Is there a way to Power Off keeping the fans running? As I have much higher chip temperatures with BOS (around 80 degrees celsius vs 60 with original FW) it just seems wrong unplugging it without cooling it down firs.

It is a known issue, (temperature sensors not supported by Braiins OS in some batch/rev. models) hopefully it will be fixed in the next release this month...

This table is very helpful - thank you.

Chain Configuration (CGMiner General Config - under Services) displays 6 Chains (Chains 1-6).   Which correspond to Chains 6, 7, 8 on the Miner Status page?  (And why are there 6 chains??

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Thanks for the great firmware.

I have one S9 that displays Temp 1 and Temp 2 as 0 for all chains.  Is this a known issue and is there a fix?  

Thanks

Nice! You're spoiling me with all the info.  

I checked out the Crontab generator and now i believe i got it.

I'm gonna try this during the weekend and think the following should be right (let's say I will be doing this at 10 AM saturday):
- I first put 5 10 * * * /etc/init.d/cgminer reload. Then the miner should process a "save&apply"=reload cgminer at 10:05.
- If this works I put 0 */12 * * * /etc/init.d/cgminer reload to get the same command processed once every noon and once every midnight.

One last question (for now): Should the >/dev/null 2>&1 crontab is giving be left out?

BR.
Steff

- yes
- yes, put it exactly as I wrote it (including stars)
- "0 */6" stands for "every 6hours at 0 minute" (0:00, 6:00, 12:00, ...). If you want to test it for example at 10:05PM you should  put "5 22 * * *" (it uses 24h format, 10PM=22hours).

Hi.

Thank you very much for this info. I will do som reading and next time I go check my miner I will try it out.

Sorry for the stupic questins, but:
- Can this be written straight into the scheduled task window in BOS web interface?
- Should I write it just as you wrote, or should there be something else instead of the stars?
- I assume the "6" stands for hours. Is there possibel to put in minutes also? Like 0 hours and 5 minutes? Just to check if it works.

I might find the info myself when I get to read the info on https://crontab-generator.org/, but I don't have the time right now.

BR.
Steff

I tested it via SSH and command you want to run is /etc/init.d/cgminer reload as root. I believe that you need to add


to BOS Scheduled tasks and restart miner to load crontab changes. That command will reload cgminer every 6 hours (please refer to https://crontab-generator.org/ to understand crontab syntax).

EDIT: I just tested it and its working like a charm.

This is solid advice, and it might be what future miners will be anyway. When mining becomes unprofitable at any price, those large operations will have to shutdown anyway... And those who installed renewable can continue up to their generation capacity.

Long term power is king.  A retreat to a base camp of a 20 amp 240 volt solar system  will allow for 2 s9s or one m10.  When times are better you can go beyond the base camp and mine on the grid.

Logically it makes no sense to keep it running and incur in loses. But perhaps investing in solar/wind energy could later help reduce your power bills? All you need is a grid tie inverter and panels/wind turbine/etc, no batteries (the grid is your battery).

I agree. Might be really fun.  

In your case, when electricity is free (at least up to 40 kW), I do understand your reasons as you can run a certain amount of miners up to 40 kW. Until you reach 40 kW you can just add more miners and if you reach 40 kW you just remove a few. In this case the only thing that matters is minimum W/THs (if you already have enough miners and don't need to take miner investment costs into the calculations). With the 13 cents/kW the situation is probably pretty much the same.

In my case with my electricity costs the fact is that the only reasonable thing to do would be to just unplug and buy the bitcoins. The BTC I'm mining at the moment I would need to sell at 5.500 € (with present difficulty) to even break even and at present BTC price I would get not far from double amount of BTC buying instead of mining.

Sad but true.  

BR.
Steff

Sorry busy  with setup of new solar array.

That  check on or off seems to do nothing in any way if you are pointed to a pool with asic boost.

As for cranking it up and doing 16 to 15.5 th  hoping for a btc jump

instead of going low like 10 th.

Super complex  to really tell ahead of time what to do.

But I am doing this in a 40kwatt to 90kwatt build.

First 40kwatts are solar and will be free next 50kwatts are at 13cents a kwatt.

there is a shit ton of math for figuring that out.

variables all over the place.

I'd discuss it but maybe in a different thread.

Say one on over vs under clocking the why's to do it one way over the other.  Might be a fun thread.

Hi.

I'm wondering if someone could help me with the scheduled tasks in BOS.

I'dont have my miner at home so I can't check it from the miner's web interface right now, but out of my memory there is a window in BOS web interface where you can add scheduled tasks, probably by writing some Linux commands.

As background info I'm running app. 15.5 THs with Asic Boost enabled on an S9 Jan 2018 batch 13.5 THs. The miner seems to be more sensitive when overclocked + AB and after a few days hashrate seems to drop a little bit (Now at app. 15.2 after three days). It also, if not completely, seems to be dependent of weather conditions as the miner is in a "cold" garage which changes temperature with outside temperature.

However by simply pressing "Save&Apply" in CG Miner window the speed goes right back upp where it needs to be (lets call it a soft reboot). Reboot in it's correct term doesn't do the trick so after a while (a few hours) after deep reboot i need to press the Save&Apply (soft reboot) to get the hashrate where it should be.

So I would like to schedule the "Save&Apply"-command once every 24 or 48 hours. Anyone that can help or point me in the right diection? I've been looking for a "users manual" or similar for BOS, but no luck so far and Linux is not one of my strong sides.

BR.
Steff

Oops, sorry my mistake. Fixed it, thanks!

On the other hand...

If you, like me, only have one or a few miners and can afford the electric bill without selling off your mined btc, you will have more btc to sell later when price goes up (if it ever goes up).

I'm taking a shot at this running 15,3 THs at 1470 W (equals app. 96 W/THs) with Asic Boost enabled.

I haven't counted though at what price I would need to sell at so that running 15,3 THs at 1470 W now would be more profitable than running 10 THs at 800 W. This would be interesting maths, but you need to include your electric price, bitcoin difficulty, luck, time period etc. into the equation so it might be difficult to get a correct answer.

However, if we simplify it:

Mining for one year with 15.3 THs /1470 W
With my electricity costs (in EUR): 110 €/month = 1320 €
Lets assume i would make 0.25 btc
Selling at a btc price of 3500 € (as now) would give 875 €
Loss: 445 €

Mining for one year with 10 THs / 800 W
With my electricity costs: 60 €/month = 720 €
Compared to above I would have mined 0.25 btc/15.3 THs*10 THs = 0,163 btc
Selling at a btc price of 3500 € (as now) would give app. 570 €
Loss: 150 €

If we go forward and lets say that X = btc price to sell at (in EUR also)

-1320 + 0,25X = -720 + 0,163X
0,25X - 0,163X = 1320 - 720
0,087X = 600
X = 600 / 0,087
X = 6896,55 €

So in this case the sweet spot is at app. 6900 €/btc. In other words my setup would be more profitable selling off the btc above the sweet spot and philipma1957's setup would be more profitable selling off under.

However this is not this simple as difficulty, luck, electric price changes etc. all would need to be included in the equation, as also mentioned above, to get it correct.

I also might have got something wrong as I was counting while writing, but hopefully you understand the principle.

Apprentice:
I've also noticed that overclocking is much easier with Asic Boost turned off, but with Asic Boost off my miner pulls 120-140 W (at unchanged hashrate) more out of the wall. My PSU is rated 1600 W so with the settings I have now I would be at max without Asic Boost. Obviously the above mentioned sweet spot would also be much higher even though I probably could pull out a little more THs adding who knows how much watts.

Artemis3: Just reread your input. 82 THs/W is pretty good. What firmware are you using? (I assume you menth dividing watts with hashrate and got 82 W/THs.)

BR.
Steff

Unless you have very cheap electricity, I think it is in your best interest to improve the efficiency, not the TH/s. Overclocking will do you no good if each TH consumes more watts. Its best to underclock if this makes every TH cost less, like philipma1957 just did by putting them into [email protected]~1 volts and achieving 82 watt per TH on the S9i.

Just divide your current watts with the hashrate to see if you are being more or less efficient than normal, or under-clocking.

checking asic boost is reducing the hashrate by around 0.3-0.5T but also reducing the power draw. working well on all miners.
I have noticed with asic boost enabled it is difficult to overclock it.