JianyuWang0623 commented on PR #17216:
URL: https://github.com/apache/nuttx/pull/17216#issuecomment-3432071886
> This isn't a fair comparison, and I'm not convinced that nsh could disable
more commands to align with init.
@anchao You're right. When making comparisons, the non-essential functions
of NSH should be turned off.
A rough estimate shows that after disabling the non-essential functions of
NSH (as listed below), the ELF size has decreased by 397,448 bytes. It is
estimated that the space required for NSH is approximately 220,184 bytes, and
the init component takes up 61,488 bytes.
```diff
$ diff defconfig boards/arm64/qemu/qemu-armv8a/configs/fastboot/defconfig
9d8
< # CONFIG_NSH_CONSOLE is not set
47c46
< CONFIG_INIT_ENTRYPOINT="nsh_main"
---
> CONFIG_INIT_ENTRYPOINT="init_main"
78,135d76
< CONFIG_NSH_DISABLE_ARP=y
< CONFIG_NSH_DISABLE_BASENAME=y
< CONFIG_NSH_DISABLE_CAT=y
< CONFIG_NSH_DISABLE_CD=y
< CONFIG_NSH_DISABLE_CMP=y
< CONFIG_NSH_DISABLE_CP=y
< CONFIG_NSH_DISABLE_DF=y
< CONFIG_NSH_DISABLE_DIRNAME=y
< CONFIG_NSH_DISABLE_DMESG=y
< CONFIG_NSH_DISABLE_ECHO=y
< CONFIG_NSH_DISABLE_ENV=y
< CONFIG_NSH_DISABLE_ERROR_PRINT=y
< CONFIG_NSH_DISABLE_EXEC=y
< CONFIG_NSH_DISABLE_EXIT=y
< CONFIG_NSH_DISABLE_EXPORT=y
< CONFIG_NSH_DISABLE_EXPR=y
< CONFIG_NSH_DISABLE_FDINFO=y
< CONFIG_NSH_DISABLE_FREE=y
< CONFIG_NSH_DISABLE_GET=y
< CONFIG_NSH_DISABLE_HELP=y
< CONFIG_NSH_DISABLE_HEXDUMP=y
< CONFIG_NSH_DISABLE_IFCONFIG=y
< CONFIG_NSH_DISABLE_IFUPDOWN=y
< CONFIG_NSH_DISABLE_KILL=y
< CONFIG_NSH_DISABLE_LOSETUP=y
< CONFIG_NSH_DISABLE_LS=y
< CONFIG_NSH_DISABLE_MD5=y
< CONFIG_NSH_DISABLE_MKDIR=y
< CONFIG_NSH_DISABLE_MKFATFS=y
< CONFIG_NSH_DISABLE_MKFIFO=y
< CONFIG_NSH_DISABLE_MKRD=y
< CONFIG_NSH_DISABLE_MOUNT=y
< CONFIG_NSH_DISABLE_MV=y
< CONFIG_NSH_DISABLE_NFSMOUNT=y
< CONFIG_NSH_DISABLE_NSLOOKUP=y
< CONFIG_NSH_DISABLE_PIDOF=y
< CONFIG_NSH_DISABLE_PKILL=y
< CONFIG_NSH_DISABLE_PRINTF=y
< CONFIG_NSH_DISABLE_PS=y
< CONFIG_NSH_DISABLE_PUT=y
< CONFIG_NSH_DISABLE_PWD=y
< CONFIG_NSH_DISABLE_RM=y
< CONFIG_NSH_DISABLE_RMDIR=y
< CONFIG_NSH_DISABLE_SET=y
< CONFIG_NSH_DISABLE_SLEEP=y
< CONFIG_NSH_DISABLE_SOURCE=y
< CONFIG_NSH_DISABLE_TEST=y
< CONFIG_NSH_DISABLE_TIME=y
< CONFIG_NSH_DISABLE_TRUNCATE=y
< CONFIG_NSH_DISABLE_UMOUNT=y
< CONFIG_NSH_DISABLE_UNAME=y
< CONFIG_NSH_DISABLE_UNSET=y
< CONFIG_NSH_DISABLE_UPTIME=y
< CONFIG_NSH_DISABLE_USLEEP=y
< CONFIG_NSH_DISABLE_WAIT=y
< CONFIG_NSH_DISABLE_WATCH=y
< CONFIG_NSH_DISABLE_WGET=y
< CONFIG_NSH_DISABLE_XD=y
```
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