From 65cd430d7687f4769d1bb6f507e428638c82ea06 Mon Sep 17 00:00:00 2001
From: Tanguy Pruvot <tanguy.pruvot@gmail.com>
Date: Mon, 26 Sep 2016 23:53:56 +0200
Subject: [PATCH] cuda: throughput2intensity function to show default

---
 cuda.cpp     | 15 +++++++++++++++
 lbry/lbry.cu |  1 +
 miner.h      |  1 +
 3 files changed, 17 insertions(+)

diff --git a/cuda.cpp b/cuda.cpp
index 4575214..1a6f852 100644
--- a/cuda.cpp
+++ b/cuda.cpp
@@ -172,6 +172,21 @@ uint32_t cuda_default_throughput(int thr_id, uint32_t defcount)
 	return throughput;
 }
 
+// since 1.8.3
+double throughput2intensity(uint32_t throughput)
+{
+	double intensity = 0.;
+	uint32_t ws = throughput;
+	uint8_t i = 0;
+	while (ws > 1 && i++ < 32)
+		ws = ws >> 1;
+	intensity = (double) i;
+	if (i && ((1U << i) < throughput)) {
+		intensity += ((double) (throughput-(1U << i)) / (1U << i));
+	}
+	return intensity;
+}
+
 // if we use 2 threads on the same gpu, we need to reinit the threads
 void cuda_reset_device(int thr_id, bool *init)
 {
diff --git a/lbry/lbry.cu b/lbry/lbry.cu
index 3ca21f1..6aaeb15 100644
--- a/lbry/lbry.cu
+++ b/lbry/lbry.cu
@@ -116,6 +116,7 @@ extern "C" int scanhash_lbry(int thr_id, struct work *work, uint32_t max_nonce,
 			cudaDeviceSetCacheConfig(cudaFuncCachePreferL1);
 			CUDA_LOG_ERROR();
 		}
+		gpulog(LOG_INFO, thr_id, "Intensity set to %g, %u cuda threads", throughput2intensity(throughput), throughput);
 
 		if(device_sm[dev_id] <= 500)
 			CUDA_SAFE_CALL(cudaMalloc(&d_hash[thr_id], (size_t) 8 * sizeof(uint64_t) * throughput));
diff --git a/miner.h b/miner.h
index 5886a2d..2b0ca15 100644
--- a/miner.h
+++ b/miner.h
@@ -513,6 +513,7 @@ int cuda_available_memory(int thr_id);
 
 uint32_t cuda_default_throughput(int thr_id, uint32_t defcount);
 #define device_intensity(t,f,d) cuda_default_throughput(t,d)
+double throughput2intensity(uint32_t throughput);
 
 void cuda_log_lasterror(int thr_id, const char* func, int line);
 void cuda_clear_lasterror();