add a --max-concurrency flag

It sets the max number of threads to use for a parallel job.
This is different that the number of total threads, since monero
binaries typically start a lot of them.

2 files changed, 9 insertions, 0 deletions

diff --git a/src/daemon/command_line_args.h b/src/daemon/command_line_args.h
index 2dca5e3e7..1fe2ddcf6 100644
--- a/src/daemon/command_line_args.h
+++ b/src/daemon/command_line_args.h
@@ -59,6 +59,11 @@ namespace daemon_args
     "os-version"
   , "OS for which this executable was compiled"
   };
+  const command_line::arg_descriptor<unsigned> arg_max_concurrency = {
+    "max-concurrency"
+  , "Max number of threads to use for a parallel job"
+  , 0
+  };
 }  // namespace daemon_args
 
 #endif // DAEMON_COMMAND_LINE_ARGS_H
diff --git a/src/daemon/main.cpp b/src/daemon/main.cpp
index 0717fd89b..bfd829dea 100644
--- a/src/daemon/main.cpp
+++ b/src/daemon/main.cpp
@@ -81,6 +81,7 @@ int main(int argc, char const * argv[])
       bf::path default_log = default_data_dir / std::string(CRYPTONOTE_NAME ".log");
       command_line::add_arg(core_settings, daemon_args::arg_log_file, default_log.string());
       command_line::add_arg(core_settings, daemon_args::arg_log_level);
+      command_line::add_arg(core_settings, daemon_args::arg_max_concurrency);
 
       daemonizer::init_options(hidden_options, visible_options);
       daemonize::t_executor::init_options(core_settings);
@@ -260,6 +261,9 @@ int main(int argc, char const * argv[])
         );
     }
 
+    if (command_line::has_arg(vm, daemon_args::arg_max_concurrency))
+      tools::set_max_concurrency(command_line::get_arg(vm, daemon_args::arg_max_concurrency));
+
     _note_c("dbg/main", "Moving from main() into the daemonize now.");
 
     return daemonizer::daemonize(argc, argv, daemonize::t_executor{}, vm);