Re: Git performance on OS X

On Sun, 20 Apr 2008, Pieter de Bie wrote:

Yes, I just tested this.

	for (int i = 0; i < 50000; i++) {
		sprintf(s, "/Users/pieter/test/perf/%i", i);
		int ret = lstat(s, a);
	}

This loop needs about 3 seconds to  run. Replacing the i with 10 in the
sprintf reduces it to 0.24seconds.

Ok.

On my machine, that's

	real    0m0.090s

with the 50,000 different files, and with the same filename it's

	real    0m0.081s

so yes, we're looking at another case of Linux performance just being in a 
class of its own.

Taking three seconds for the warm-cache case for just 50,000 files is 
ludicrous. That's about an order-and-a-half slower than what I see.

Maybe my CPU is faster too (2.66GHz Core 2), but the thing is, Linux 
really does tend to outperform others at a lot of these kinds of loads. 
System calls are fast to begin with, and the Linux directory cache kicks 
ass, if I do say so myself.

OS X doth suck. 

			Linus