_ Git_PS1在内核树中非常慢

$ time __git_ps1
((v2.6.33.4))
real    0m1.467s
user    0m0.864s
sys  0m0.564s

这使我的提示不可用;另一方面,它太有用了,不能轻易放弃。你知道为什么它跑得这么慢吗?我能做些什么?

安装细节:

$ uname -a
Linux martin-laptop 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:36:48 UTC 2010 i686 GNU/Linux

$ git --version
git version 1.7.1

$ du -sh .
876M    .

我怀疑我的机器有问题,因为在我的同事的盒子里,在我克隆的内核树中,相同的命令会立即返回

$ time __git_ps1
((v2.6.33.4))
real    0m0.039s
user    0m0.008s
sys 0m0.016s

添加hdparm输出:

矿

$ sudo hdparm -tT /dev/sda4

/dev/sda4:
 Timing cached reads:   1542 MB in  2.00 seconds = 772.35 MB/sec
 Timing buffered disk reads:  110 MB in  3.02 seconds =  36.42 MB/sec

同事的

$ sudo hdparm -Tt /dev/sda6

/dev/sda6:
 Timing cached reads:   1850 MB in  2.00 seconds = 926.03 MB/sec
 Timing buffered disk reads:  210 MB in  3.02 seconds =  69.53 MB/sec

其他区别:同事运行的是git 1.6.5,我运行的是1.7.1