Grin-miner 0.5.2 detects only 1 GPU

[fatchance]

@AskSatoshi

but now I get error during compilation and miner detects just 1 card.

Assuming you followed the grin-miner instructions:

1. From your screenshot, it looks like those are only compilation warnings, not errors.
2. Did you follow the instructions in @Yeastplume’s post about multiple GPUs? Specifically, in your grin-miner.toml file:

@Yeastplume

Running Multiple GPUs

You may have multiple GPUs in your machine (like in a dedicated mining rig, for instance). In this case, you can configure the cuda plugin to run as many on them at a time as you desire.

To do this, modify the cuda plugin configuration section of grin.toml to look roughly similar to the following, (depending on how many devices you want to use):

#Parameters can be set per device, as below. In sync mode
#device 0 is currently the only device used. In async mode
#device 0 is used by default, and all other devices are
#disabled unless explicitly enabled by setting the 'USE_DEVICE'
#param to 1 on each device, as demonstrated below.

[[mining.miner_plugin_config]]
type_filter = "cuda"
[mining.miner_plugin_config.device_parameters.0]
USE_DEVICE = 1

# Below are advanced optional per-device tweakable params

#GENU_BLOCKS = 256
#GENU_TPB = 8
#GENV_STAGE1_TPB = 32
#GENV_STAGE2_TPB = 128
#TRIM_STAGE1_TPB = 32
#TRIM_STAGE2_TPB = 96
#RENAME_0_STAGE1_TPB = 32
#RENAME_0_STAGE2_TPB = 64
#RENAME_1_STAGE1_TPB = 32
#RENAME_1_STAGE2_TPB = 128
#TRIM_3_TPB = 64
#RENAME_3_TPB = 2

[mining.miner_plugin_config.device_parameters.1]
USE_DEVICE = 1

#[mining.miner_plugin_config.device_parameters.2]
#USE_DEVICE = 1

Note we’re leaving the advanced tweakable parameters commented out for now, and will just use the defaults. In my case, I’ve switched to another machine with 2 GPUs installed, and I’ve enabled another section to include the second device. If I had a third installed, I’d add another sections such as
[mining.cuckoo_miner_plugin_config.device_parameters.3] and configure parameters for it as desired.

Hope this helps.