[TD-3185]<fix>: default numOfCommitThreads to 4, show in cfg template

packaging/cfg/taos.cfg

@@ -29,6 +29,9 @@
 # number of threads per CPU core
 # numOfThreadsPerCore       1.0
 
+# number of threads to commit cache data
+# numOfCommitThreads        4
+
 # the proportion of total CPU cores available for query processing
 # 2.0: the query threads will be set to double of the CPU cores.
 # 1.0: all CPU cores are available for query processing [default].

src/common/src/tglobal.c

@@ -51,7 +51,7 @@ int32_t tsMaxShellConns  = 50000;
 int32_t tsMaxConnections = 5000;
 int32_t tsShellActivityTimer  = 3;  // second
 float   tsNumOfThreadsPerCore = 1.0f;
-int32_t tsNumOfCommitThreads = 1;
+int32_t tsNumOfCommitThreads = 4;
 float   tsRatioOfQueryCores = 1.0f;
 int8_t  tsDaylight       = 0;
 char    tsTimezone[TSDB_TIMEZONE_LEN] = {0};