Mixing GPUs

eaglescouter · Jan 13, 2014

Janus67 said:
Can I do two separate pools (290x on middlecoin and 7950 on give-me-coins)? Or is that required in running two separate cgminer instances, thus cgwatcher I assume can only see one, no?

You can do that if you run two .bat files, one per card.

I have no knowledge of cgwatcher, you can teach me about that one.

ivanlabrie · Jan 13, 2014

You can have hashrate distributed between two pools using a flag in the conf or bat...but not a card dedicated to each pool unless you run two miner instances.
Cgwatcher is easy to use and pretty cool

Janus67 · Jan 13, 2014

Will try that out

xsuperbgx · Jan 13, 2014

I couldn't figure out how to get cgwatcher to see 2 instances of cgminer. I have a 7970 that likes 2 theads and a 7950 that needs one thread in the same machine. I couldn't figure it out and have been running the 7970 with only one thread.

dyckah · Jan 13, 2014

xsuperbgx said:
I couldn't figure out how to get cgwatcher to see 2 instances of cgminer. I have a 7970 that likes 2 theads and a 7950 that needs one thread in the same machine. I couldn't figure it out and have been running the 7970 with only one thread.

there is a way to setup cgminer with one instance, and two different settings for the cards.
im not 100% sure on how that works, i gotta figure that out myself shortly here too, i'll let you know if i figure it out before someone else pitches in on that.

xsuperbgx · Jan 13, 2014

I have different settings for the gpus in cgminer, but gpu threads cannot be different. (was my understanding anyways)

dyckah · Jan 13, 2014

you can have everything else different, i dont see why you would need to have that the same. and if you cant do it with the bat file, surely theres a way to do it via config files, but i have never used config files, so im not too sure.

ivanlabrie · Jan 13, 2014

Janus67 said:
It's on my main system in the sig. I just added it to the 4th slot of the mobo (third slot didn't give any room for the 290X to breathe).

- I know this isn't the pic thread

I'm going to try dropping the clocks down when I get home. I looked at my stats on middlecoin and the PC is frozen again.

xsuperbgx said:
I couldn't figure out how to get cgwatcher to see 2 instances of cgminer. I have a 7970 that likes 2 theads and a 7950 that needs one thread in the same machine. I couldn't figure it out and have been running the 7970 with only one thread.

dyckah said:
you can have everything else different, i dont see why you would need to have that the same. and if you cant do it with the bat file, surely theres a way to do it via config files, but i have never used config files, so im not too sure.

cgwatcher has an easy config editor, use it, and put threads separated by commas.

gpu-threads 1,2

xsuperbgx · Jan 13, 2014

i don't think different thread counts are compatible with cgminer. I have no problem working config files, it just has never worked if you put multiple thread count values in one config.
Perhaps I need a newer cgminer. Can anyone confirm this?

ivanlabrie · Jan 13, 2014

xsuperbgx said:
i don't think different thread counts are compatible with cgminer. I have no problem working config files, it just has never worked if you put multiple thread count values in one config.
Perhaps I need a newer cgminer. Can anyone confirm this?

I'm telling you, you can use different thread counts...since cgminer 1.0 xD

Try cgwatcher conf editor. Separate values with ,. You'll need 1,2 or 2,1 depending on the order of the devices in cgminer.

xsuperbgx · Jan 13, 2014

It has been a few weeks since I was working on this, but I have tried.

Since cgminer won't allow you to configure different thread counts per card you'll need to run multiple instances.

http://www.thecoinrush.com/frequently-asked-questions

Afaik it's not possible(achieve max khs for 7950+7970) with single instance of cgminer, cause -g is global parameter, however 7970 requires 2 and 7950 - 1.
But you can try launch two separate instances, look into "-d" option and "--remove-disabled".

Tho, if -g is not the issue and you are using 1 for both 7950 and 7970, then set TC manually, find your working .bin files and look for TC, f.e. - scrypt130511Tahitiglg2tc46080w256l4.bin -- TC=46080

post #2 https://litecointalk.org/index.php?topic=6640.0
Although in that last link there is a possible solution that I haven't seen before.

Give this a go:

cgminer doesn't support different gpu-threads per cards. The number of threads is set in driver-opencl.c, ~ line 1267-1269 . You can write something like

if (0 == i) // i - gpu number
cgpu->threads = 1;
else if (1 == i)
cgpu->threads = 2;

This is a bad practice to patch code like this but it's takes 3 minutes to fix

The above finding is not my own but seems to work.

Janus67 · Jan 13, 2014

Have the two cards running now in separate instances. Need to re-tweak the 290 as the khs dropped down to around 860 from 910-920. I have the 7950 running at 545khs as well, want to get that above/near 600.

Silver_Pharaoh · Jan 13, 2014

Just finished some more tweaking: 980 Core 1140 Mem @ 1.25 Volts now gets me 285 Kh/s with -i 19!

Yessssss :thup:

It seems that everyone who has owned a 6850 regularly ran it at 1.25 volts, and I haven't read any reports of it burning up at that voltage so I'll run it at these speeds for a while.

gungeek · Jan 13, 2014

Janus67 said:
Have the two cards running now in separate instances. Need to re-tweak the 290 as the khs dropped down to around 860 from 910-920. I have the 7950 running at 545khs as well, want to get that above/near 600.

How did you get 2 separate instances of cgminer working?

I'm also trying to run a 7970 with 2 gpu threads and a 7950 with 1 gpu thread.

Janus67 · Jan 13, 2014

Made a separate cgminer directory and used a bat file to load the 7950 conf file while cgwatcher takes care of the 290. Had to load cgwatcher first or else the 7950 takes over it appears

gungeek · Jan 14, 2014

Janus67 said:
Made a separate cgminer directory and used a bat file to load the 7950 conf file while cgwatcher takes care of the 290. Had to load cgwatcher first or else the 7950 takes over it appears

I did the separate directory and batch files, but ran into that issue as well. I used "-d" and "--remove-disabled" parameters in the command lines. The first batch file starts the 7970 with 2 gpu threads; perfect. However, the 7950 batch file overwrites the 7970 clocks when it is started. I can manually change the 7970 settings back, but there should be a better way. Maybe cgwatcher is the solution.

It's an improvement though. The 7970 is now at 720Kh/s with 2 gpu threads compared to 680Kh/s using 1 gpu thread and the gpu temp stayed the same.

ivanlabrie · Jan 14, 2014

Guys, you can have different thread count in the conf!

xsuperbgx · Jan 14, 2014

ivanlabrie said:
Guys, you can have different thread count in the conf!

Like I said, I tried and could not get it to work.

To use separate instances of cgminer you have to select device in conf. And then disable the other device. In the second conf file you select the other device and disable the first.

Edit: I have used the conf editor in cgwatcher too, it won't write a conf with multiple values for the GPU threads.

ivanlabrie · Jan 14, 2014

xsuperbgx · Jan 14, 2014

Hmm, which windows and which gpu drivers?

Mixing GPUs

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