xi: xtabond2 y l.y x1 x2 , gmm(l.y, collapse)  nolevel small nomata

就这一条简单命令，报错一堆：
Building GMM instruments.op. sys. refuses to provide memory
    Stata's data-storage memory manager has already allocated 1712m bytes and it just attempted to allocate another 16m bytes.  The operating system said no.  Perhaps you are running another
    memory-consuming task and the command will work later when the task completes.  Perhaps you are on a multiuser system that is especially busy and the command will work later when activity
    quiets down.  Perhaps a system administrator has put a limit on what you can allocate; see help memory.  Or perhaps that's all the memory your computer can allocate to Stata.
r(909);已经设置了:
set memory 1000m
希望明白人指点迷经, 非常感谢