1. 查看某个进程占用的内存

    ps -p 17286 --no-headers -o pid,comm,rss,%mem | awk '{printf "%-8s %-20s %8.2f MB  %5s%%\n", $1, $2, $3/1024, $4}'

  2. gdb调试进程或coredump文件时，变量取值出现’optimized out’时，关闭编译优化

    # 以编译PG为例：
configure --enable-debug --disable-optimizations CFLAGS="-g -O0 -fno-inline -fno-omit-frame-pointer"

  3. gdb启动调试阶段，自动执行命令

    touch ~/.gdbinit
echo "handle SIGUSR2 nostop noprint" >> ~/.gdbinit

  4. 判断编译选项

    readelf --debug-dump=info `which bin_name` | grep -E 'DW_AT_producer.*O[0-9]'