Remove obsolete benchmark mode

This mode/setting is unusable left-over from SHA-256 cgminer. It does not work with Scrypt or other algorithms that are used in sgminer. Removed in single commit so it can be used as reference, if benchmark mode is added in the future.

doc/configuration.md

@@ -431,7 +431,6 @@ sgminer 4.2.1-116-g2e8b-dirty
   * [worksize](#worksize)
   * [xintensity](#xintensity)
 * [Miscellaneous Options](#miscellaneous-options)
-  * [benchmark](#benchmark)
   * [compact](#compact)
   * [debug](#debug)
   * [default-profile](#default-profile)
@@ -1709,22 +1708,6 @@ See [xintensity](#xintensity).
 
 ## Miscellaneous Options
 
-### benchmark
-
-Runs sgminer in benchmark mode. **This does not produce any shares.**
-
-*Available*: Global
-
-*Config File Syntax:* `"benchmark":true`
-
-*Command Line Syntax:* `--benchmark`
-
-*Argument:* None
-
-*Default:* `false`
-
-[Top](#configuration-and-command-line-options) :: [Config-file and CLI options](#config-file-and-cli-options) :: [Miscellaneous Options](#miscellaneous-options)
-
 ### compact
 
 Use a compact display, without per device statistics.

sgminer.c

@@ -168,7 +168,6 @@ static int init_pool; //pool used to initialize gpus
 
 bool opt_work_update;
 bool opt_protocol;
-static bool opt_benchmark;
 bool have_longpoll;
 bool want_per_device_stats;
 bool use_syslog;
@@ -1385,9 +1384,6 @@ struct opt_table opt_config_table[] = {
   OPT_WITHOUT_ARG("--balance",
       set_balance, &pool_strategy,
       "Change multipool strategy from failover to even share balance"),
-  OPT_WITHOUT_ARG("--benchmark",
-      opt_set_bool, &opt_benchmark,
-      "Run sgminer in benchmark mode - produces no shares"),
 #ifdef HAVE_CURSES
   OPT_WITHOUT_ARG("--compact",
       opt_set_bool, &opt_compact,
@@ -3352,24 +3348,6 @@ static void calc_diff(struct work *work, double known)
   }
 }
 
-static void get_benchmark_work(struct work *work)
-{
-  // Use a random work block pulled from a pool
-  static uint8_t bench_block[] = { SGMINER_BENCHMARK_BLOCK };
-
-  size_t bench_size = sizeof(*work);
-  size_t work_size = sizeof(bench_block);
-  size_t min_size = (work_size < bench_size ? work_size : bench_size);
-  memset(work, 0, sizeof(*work));
-  memcpy(work, &bench_block, min_size);
-  work->mandatory = true;
-  work->pool = pools[0];
-  cgtime(&work->tv_getwork);
-  copy_time(&work->tv_getwork_reply, &work->tv_getwork);
-  work->getwork_mode = GETWORK_MODE_BENCHMARK;
-  calc_diff(work, 0);
-}
-
 #ifdef HAVE_CURSES
 static void disable_curses_windows(void)
 {
@@ -3881,9 +3859,6 @@ static bool stale_work(struct work *work, bool share)
   struct pool *pool;
   int getwork_delay;
 
-  if (opt_benchmark)
-    return false;
-
   if (work->work_block != work_block) {
     applog(LOG_DEBUG, "Work stale due to block mismatch");
     return true;
@@ -7320,8 +7295,7 @@ static void *watchpool_thread(void __maybe_unused *userdata)
     for (i = 0; i < total_pools; i++) {
       struct pool *pool = pools[i];
 
-      if (!opt_benchmark)
-        reap_curl(pool);
+      reap_curl(pool);
 
       /* Get a rolling utility per pool over 10 mins */
       if (intervals > 19) {
@@ -8386,21 +8360,6 @@ int main(int argc, char *argv[])
   //apply pool-specific config from profiles
   apply_pool_profiles();
 
-  if (opt_benchmark) {
-    struct pool *pool;
-
-    // FIXME: executes always (leftover from SHA256d days)
-    quit(1, "Cannot use benchmark mode with scrypt");
-    pool = add_pool();
-    pool->rpc_url = (char *)malloc(255);
-    strcpy(pool->rpc_url, "Benchmark");
-    pool->rpc_user = pool->rpc_url;
-    pool->rpc_pass = pool->rpc_url;
-    enable_pool(pool);
-    pool->idle = false;
-    successful_connect = true;
-  }
-
 #ifdef HAVE_CURSES
   if (opt_realquiet || opt_display_devs)
     use_curses = false;
@@ -8538,9 +8497,6 @@ int main(int argc, char *argv[])
 
 //  restart_mining_threads(mining_threads);
 
-  if (opt_benchmark)
-    goto begin_bench;
-
   /* Set pool state */
   for (i = 0; i < total_pools; i++) {
     struct pool *pool = pools[i];
@@ -8612,7 +8568,6 @@ int main(int argc, char *argv[])
   if(slept >= 60)
     applog(LOG_WARNING, "GPUs did not become initialized in 60 seconds...");
 
-begin_bench:
   total_mhashes_done = 0;
   for (i = 0; i < total_devices; i++) {
     struct cgpu_info *cgpu = devices[i];
@@ -8746,13 +8701,6 @@ retry:
       continue;
     }
 
-    if (opt_benchmark) {
-      get_benchmark_work(work);
-      applog(LOG_DEBUG, "Generated benchmark work");
-      stage_work(work);
-      continue;
-    }
-
 #ifdef HAVE_LIBCURL
     struct curl_ent *ce;