Merge pull request EOSIO#2546 from EOSIO/2544

Add shared memory size option

plugins/chain_plugin/chain_plugin.cpp

@@ -40,6 +40,7 @@ class chain_plugin_impl {
    time_point                       genesis_timestamp;
    uint32_t                         skip_flags = skip_nothing;
    bool                             readonly = false;
+   uint64_t                         shared_memory_size;
    flat_map<uint32_t,block_id_type> loaded_checkpoints;
 
    fc::optional<fork_database>      fork_db;
@@ -75,6 +76,8 @@ void chain_plugin::set_program_options(options_description& cli, options_descrip
          ("max-deferred-transaction-time", bpo::value<int32_t>()->default_value(20),
           "Limits the maximum time (in milliseconds) that is allowed a to push deferred transactions at the start of a block")
          ("wasm-runtime", bpo::value<eosio::chain::wasm_interface::vm_type>()->value_name("wavm/binaryen"), "Override default WASM runtime")
+         ("shared-memory-size-mb", bpo::value<uint64_t>()->default_value(config::default_shared_memory_size / (1024  * 1024)), "Minimum size MB of database shared memory file")
+
 #warning TODO: rate limiting
          /*("per-authorized-account-transaction-msg-rate-limit-time-frame-sec", bpo::value<uint32_t>()->default_value(default_per_auth_account_time_frame_seconds),
           "The time frame, in seconds, that the per-authorized-account-transaction-msg-rate-limit is imposed over.")
@@ -128,6 +131,9 @@ void chain_plugin::plugin_initialize(const variables_map& options) {
       else
          my->block_log_dir = bld;
    }
+   if (options.count("shared-memory-size-mb")) {
+      my->shared_memory_size = options.at("shared-memory-size-mb").as<uint64_t>() * 1024 * 1024;
+   }
 
    if (options.at("replay-blockchain").as<bool>()) {
       ilog("Replay requested: wiping database");
@@ -182,6 +188,7 @@ void chain_plugin::plugin_startup()
    my->chain_config->block_log_dir = my->block_log_dir;
    my->chain_config->shared_memory_dir = app().data_dir() / default_shared_memory_dir;
    my->chain_config->read_only = my->readonly;
+   my->chain_config->shared_memory_size = my->shared_memory_size;
    my->chain_config->genesis = fc::json::from_file(my->genesis_file).as<contracts::genesis_state_type>();
    if (my->genesis_timestamp.sec_since_epoch() > 0) {
       my->chain_config->genesis.initial_timestamp = my->genesis_timestamp;