Up to 25% speedup on linux if you're lucky.

rivz666 · Jun 8, 2014 · fc4433c · fc4433c
1 parent 12dc73f
commit fc4433c
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/cryptonight_common.c b/cryptonight_common.c
@@ -64,6 +64,7 @@ int scanhash_cryptonight(int thr_id, uint32_t *restrict pdata, const uint32_t *r
 		#if defined __unix__ && (!defined __APPLE__)
 		persistentctx = (struct cryptonight_ctx *)mmap(0, sizeof(struct cryptonight_ctx), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB | MAP_POPULATE, 0, 0);
 		if(persistentctx == MAP_FAILED) persistentctx = (struct cryptonight_ctx *)malloc(sizeof(struct cryptonight_ctx));
+		madvise(persistentctx, sizeof(struct cryptonight_ctx), MADV_RANDOM | MADV_WILLNEED | MADV_HUGEPAGE);
 		#elif defined _WIN32
 		persistentctx = VirtualAlloc(NULL, sizeof(struct cryptonight_ctx), MEM_LARGE_PAGES, PAGE_READWRITE);
 		if(!persistentctx) persistentctx = (struct cryptonight_ctx *)malloc(sizeof(struct cryptonight_ctx));
@@ -77,10 +78,16 @@ int scanhash_cryptonight(int thr_id, uint32_t *restrict pdata, const uint32_t *r
 		cryptonight_hash_ctx(hash, pdata, persistentctx);
 		if (unlikely(hash[7] < ptarget[7])) {
 			*hashes_done = n - first_nonce + 1;
+			#if defined __unix__ && (!defined __APPLE__)
+			munmap(persistentctx, sizeof(struct cryptonight_ctx));
+			#endif
 			return true;
 		}
 	} while (likely((n <= max_nonce && !work_restart[thr_id].restart)));
 
     *hashes_done = n - first_nonce + 1;
+    #if defined __unix__ && (!defined __APPLE__)
+	munmap(persistentctx, sizeof(struct cryptonight_ctx));
+	#endif
     return 0;
 }