🚀 go-pugleaf

In <4gma3b$l9r@shellx.best.com>, cwolf@wolfware.com said:

>
>On 02/21/96, John Kheit wrote:

>>Under most DOS benchmarks I get rediculous read/write performance
>>reports.  My barracuda also gets around 6.7m/sec (and its not wide
>>or anything)...  Under NeXTSTEP (i.e. Unix variant) and using IOzone
>>(an excellent benchmark, don't know if it exists for other OS's)
>>I get more accurate reports around 2m/sec.

>>IOzone simulates real world read/writes, and is careful to make
>>the test file big enough so there are no secondary memory caching
>>effects.  I.E. if you have 32megs of RAM and you use a test file
>>of only 8megs, odds are that significant portions of it will be
>>cached by the system.

>Whoa!  I agree that many benchmarks are way too easily fooled by cache and
>that IOZone is one of the better benchmarks when used with a large enough
>test file.  (I also like IOStone too.)

>However: 

>a) Barracuda 2 and Barracuda 4 series CAN actually achieve close to 7
>MB/second doing continuous reads/writes from certain zones.  Hook 'em up
>to an appropriate controller on an Amiga (which has really tiny OS/FS
>overhead) and you can almost achieve transfers at that rate even going
>through the filesystem in real world situations.  Of course, real world
>also involves some seeking but....  (And then there are the 12450W and
>the new 4LP and 8 Barracuda series which look like they can achieve close
>to 14 MB/second internal transfer rate from the media.)

That is why I feel that an accurate benchmarking program will go through the
OS and perform real reads and writes on real files.  That is what prompted
me to write the program I used. :-)


>b) NEXTSTEP sucks in terms of driver/file-system performance and in this
>case is negatively impacting the figures that are being reported rather
>than reporting them "accurately."   Case in point:  IOZone exists for
>many Unix variants.  Take an Intel box.  Install NeXTSTEP/fip.  Run
>IOZone.  Remove NeXTSTEP and install Linux, FreeBSD, NetBSD or another
>Unix (Solaris maybe?) on the same system.  Run IOZone and watch your
>numbers double.  I haven't quite ever been able to figure out if this is
>a filesystem or driver-system problem on NeXTSTEP (and no it doesn't seem
>to be a problem with any one particular driver.)

It must.  2MB/sec with a Barracuda is TERRIBLE!!!  The drive I tested on was
just a Hawk...

Thanks for providing some support, I am tiring of the flames.


--
jcorigan@teleport.com (John Corrigan)



.. How do you make Windows faster?  Throw it harder!
-- MR/2 2.26 #314