我尝试以root用户身份启动模拟器：
ps / # /home/pscat/opt/android-sdk-linux/tools/emulator -avd avd4.0
Could not configure '/dev/rtc' to have a 1024 Hz timer. This is not a fatal
error, but for better emulation accuracy either use a 2.6 host Linux kernel or
type 'echo 1024 > /proc/sys/dev/rtc/max-user-freq' as root.
Failed to allocate 536870912 B: Cannot allocate memory
我该怎么办？