Re: [Census] So who uses git?

[Linus Torvalds <torvalds@osdl.org>]

On Wed, 1 Feb 2006, Alex Riesen wrote:
> 
> $ time git update-index --refresh
> 
> real    0m21.500s
> user    0m0.358s
> sys     0m1.406s
> 
> WinNT, NTFS, 13k files, hot cache.

That's 25% less files than the Linux kernel, and I can do that operation 
in 0m0.062s (0.012s user, 0.048s system).

So WinNT/cygwin is about 2.5 _orders_of_maginitude_ slower here, or 340 
times slower.

Now, I'm tempted to say that NT is a piece of sh*t, but the fact is, your 
CPU-times seem to indicate that most of it is IO (and the "real" cost is 
just 1.7 seconds, much of which is system time, which in turn itself is 
probably due to the IO costs too - so even that isn't comparable with 
the ).

Which may mean that you simply don't have enough memory to cache the whole 
thing. Which may be NT sucking, of course ("we don't like to use more than 
10% of memory for caches"), but it might also be a tunable (which is sucky 
in itself, of course), but finally, it might just be that you just don't 
have a ton of memory. I've got 2GB in my machines, although 1GB is plenty 
to cache the kernel.

			Linus