After eliminating cables and power there is the fact the boards and chips are all slightly different grades or qualities. Same thing with GPU's you should tune them individually. I really wish there was an easier way to clock them in 1Mhz increments.
Yep, I assumed as much...I have 5 "identical" MSI 7950's and each of them has their own "personality"...so my cgminer.conf is setup to take that into account.
How do you set config settings on an individual level? I presume via minerd?
How do you keep track of which miner is which USB device? It seems that each time the RasPi starts up they get all "mixed" up so ACM0 is now ACM9 some such. Or am I completely dumb?
That is a great question!
Here is something easy to script on startup using a lot of the scripts in the linux section of the OP.
ls -la /dev/serial/by-id/usb-STMicroelectronics_STM32_Virtual_COM_Port_8D*
/dev/serial/by-id/usb-STMicroelectronics_STM32_Virtual_COM_Port_
XXXXXXXXXXXX-if00 ->
../../ttyACM0Which shows all gridseeds there serial number and their com port.
ls -la /dev/serial/by-path/
Which shows all devices by path. Path can be hard to decipher unless you see it visually:
Shows all usb devices in a bus/device tree.
Using the above device by serial number code you can mine and program each instance separately with something like mine-SERIALNUMBER.sh which contains:
#!/bin/bash
cd /home/miner/cpuminer
screen -dmS $1 ./minerd --options --options -G /dev/$i
sleep 1
then modify this to kick them off and tie the serial number to the device:
for i in ` ls -1 /dev/ttyACM* | cut -d "/" -f 3`
do
echo "Device: $i"
echo -n "Is at serial: "
ls -la /dev/serial/by-id/ | grep $i | cut -d "-" -f 2|cut -d "_" -f 6
SERIAL=`ls -la /dev/serial/by-id/ | grep $i | cut -d "-" -f 2|cut -d "_" -f 6`
echo ./mine-$SERIAL.sh $i
done
I think I'll write all of my miners to use that system now that you mention it.
