[TUHS] MacOS X is Unix (tm)

Joerg Schilling schily at schily.net
Fri Jan 6 22:56:42 AEST 2017


Larry McVoy <lm at mcvoy.com> wrote:

> First, it was two claims, fast file system, and fast processes.  You 
> seem to have ignored the second one.  That second one is a big deal 
> for multi process/multi processor jobs.

Both are not aligned with my experiences. 

Note that I replaced Linux from the central web server for berlios.de 
by Solaris around 2005 and that resulted in a noticeable increased overall 
performance which includes fast processes.

> If you have access to solaris and linux running on the same hardware, 
> get a copy of lmbench and run it.  I can walk you through the results
> and if LMbench has bit rotted I'll fix it.
>
> http://mcvoy.com/lm/bitmover/lmbench/lmbench2.tar.gz

I contacted a friend and we are going to set up such a machine and do tests.
This however will take a few weeks.

BTW: I am not using "tar" for my tests but rather "star" as "tar" is too 
unspecific to be used for comparisons and as known implementations (including 
"gtar") are too slow to use them for performance metering.

Since SEEK_HOLE/SEEK_DATA is available, "star -copy ..." is e.g. at least 10% 
faster than any other copying tool, including ufsdump/ufsrestore.

Jörg

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