all: Add GPU mining, disabled by default

eth/gpu_mining.go

@@ -0,0 +1,103 @@
+// Copyright 2014 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build opencl
+
+package eth
+
+import (
+	"fmt"
+	"math/big"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/ethereum/ethash"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/miner"
+)
+
+func (s *Ethereum) StartMining(threads int, gpus string) error {
+	eb, err := s.Etherbase()
+	if err != nil {
+		err = fmt.Errorf("Cannot start mining without etherbase address: %v", err)
+		glog.V(logger.Error).Infoln(err)
+		return err
+	}
+
+	// GPU mining
+	if gpus != "" {
+		var ids []int
+		for _, s := range strings.Split(gpus, ",") {
+			i, err := strconv.Atoi(s)
+			if err != nil {
+				return fmt.Errorf("Invalid GPU id(s): %v", err)
+			}
+			if i < 0 {
+				return fmt.Errorf("Invalid GPU id: %v", i)
+			}
+			ids = append(ids, i)
+		}
+
+		// TODO: re-creating miner is a bit ugly
+		cl := ethash.NewCL(ids)
+		s.miner = miner.New(s, s.EventMux(), cl)
+		go s.miner.Start(eb, len(ids))
+		return nil
+	}
+
+	// CPU mining
+	go s.miner.Start(eb, threads)
+	return nil
+}
+
+func GPUBench(gpuid uint64) {
+	e := ethash.NewCL([]int{int(gpuid)})
+
+	var h common.Hash
+	bogoHeader := &types.Header{
+		ParentHash: h,
+		Number:     big.NewInt(int64(42)),
+		Difficulty: big.NewInt(int64(999999999999999)),
+	}
+	bogoBlock := types.NewBlock(bogoHeader, nil, nil, nil)
+
+	err := ethash.InitCL(bogoBlock.NumberU64(), e)
+	if err != nil {
+		fmt.Println("OpenCL init error: ", err)
+		return
+	}
+
+	stopChan := make(chan struct{})
+	reportHashRate := func() {
+		for {
+			time.Sleep(3 * time.Second)
+			fmt.Printf("hashes/s : %v\n", e.GetHashrate())
+		}
+	}
+	fmt.Printf("Starting benchmark (%v seconds)\n", 60)
+	go reportHashRate()
+	go e.Search(bogoBlock, stopChan, 0)
+	time.Sleep(60 * time.Second)
+	fmt.Println("OK.")
+}
+
+func PrintOpenCLDevices() {
+	ethash.PrintDevices()
+}