[feature](script) Add check_jvm_xmx for start_fe.sh

* When -Xmx is configured more than 90% of total physical memory, start_fe.sh
  will not allowed to start, because fe maybe been killed by operating system
  with a high probability.

bin/start_fe.sh

@@ -197,6 +197,29 @@ fi
 echo "using java version ${java_version}" >>"${LOG_DIR}/fe.out"
 echo "${final_java_opt}" >>"${LOG_DIR}/fe.out"
 
+function check_jvm_xmx() {
+    local os_type
+    local total_mem_byte
+    local total_mem_mb
+    local ninety_percent_mem_mb
+    local jvm_xmx_mb
+    os_type=$(uname -s)
+    if [[ "${os_type}" == "Linux" ]]; then
+        total_mem_byte="$(free -b | grep Mem | awk '{print $2}')"
+        jvm_xmx_byte="$(${JAVA} "${final_java_opt}" -XX:+PrintFlagsFinal -version 2>&1 | awk '/MaxHeapSize/ {print $4}')"
+        total_mem_mb=$(("${total_mem_byte}" / 1024 / 1024))
+        ninety_percent_mem_mb=$(("${total_mem_byte}" * 9 / 10  / 1024 / 1024))
+        jvm_xmx_mb=$(("${jvm_xmx_byte}" / 1024 / 1024))
+
+        if [[ ${jvm_xmx_mb} -gt ${ninety_percent_mem_mb} ]]; then
+            echo "java opt -Xmx is more than 90% of total physical memory"
+            echo "total_mem_mb:${total_mem_mb}MB ninety_percent_mem_mb:${ninety_percent_mem_mb}MB jvm_xmx_mb:${jvm_xmx_mb}MB"
+            exit 1;
+        fi
+    fi
+}
+check_jvm_xmx
+
 # add libs to CLASSPATH
 DORIS_FE_JAR=
 for f in "${DORIS_HOME}/lib"/*.jar; do