内存过小，gs_install安装时报错。当内存给小时，出问题提示信息不够准确

- **在gs_install 安装时报错**

```
[omm@master1 script]$ ./gs_install -X /soft/openGauss/clusterconfig.xml
Parsing the configuration file.
Check preinstall on every node.
Successfully checked preinstall on every node.
Creating the backup directory.
Last time end with Config cluster.
Continue this step.
Successfully created the backup directory.
begin deploy..
Configuring.
Deleting instances from all nodes.
Successfully deleted instances from all nodes.
Checking node configuration on all nodes.
Initializing instances on all nodes.
[GAUSS-51400] : Failed to execute the command: source /home/omm/.bashrc;python3 '/gauss/om/script/local/InitInstance.py' -U omm  -l /gauss/log/omm/omm/om/gs_local.log.Error:
Initializing instance.
[GAUSS-51615] : Failed to initialize instance. Command:/gauss/app/bin/gs_initdb --locale=C -D /gauss/data/db1 --nodename=dn_6001  -C /gauss/app/bin. Error:
The files belonging to this database system will be owned by user "omm".
This user must also own the server process.

The database cluster will be initialized with locale "C".
The default database encoding has accordingly been set to "SQL_ASCII".
The default text search configuration will be set to "english".

fixing permissions on existing directory /gauss/data/db1 ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 32MB
creating configuration files ... ok
creating template1 database in /gauss/data/db1/base/1 ... gs_initdb: removing contents of data directory "/gauss/data/db1"
```
- **下面分别是gs_local-2021-02-22_173203.log 、gs_install-2021-02-23_091213.log 里的日志** 
![](https://images.gitee.com/uploads/images/2021/0224/174314_e9510297_8719262.png "屏幕截图.png")
![输入图片说明](https://images.gitee.com/uploads/images/2021/0224/174329_dab431d2_8719262.png "屏幕截图.png")
- 通过错误提示，查看权限也没问题 /gauss/data/db1 目录里也没有创建成任何文件，一时间也没找到啥问题 :sob: 
在群里问了大神，一步步排查也没找到问题，后来我随手调了下内存，之前是1G，调成了2G，在重新执行就成功了 :grin:

**总结：内存给小的时候，报错的提示信息不够清晰，希望得到改进。**

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