Re: [Patch] shm bug introduced with pagecache in 2.3.11

Manfred Spraul (manfreds@colorfullife.com)
Sat, 13 Nov 1999 16:15:47 +0100

Alan Cox wrote:
> So you benchmarked with a very slow I/O device.
>
> Linux FAT performance is slow. Try NTFS (or FAT) versus ext2. That would
> be interesting.

Ok, I switched to a Seagate ST34520N (7200 rpm, scsi2 narrow, 4.5 GB),
and I added a new test: Linux-multi-thread vs Linux-multi-process. The
results are as I expected:

-Linux-multi-process is more or less on par with NT. The 20% difference
could be the thread/process overhead.
-Linux-multi-thread is sloww.

450000 pages test file, ext2 and NTFS, 128 MB ram, Sym810 controller,
AMD K6/200

# is the number of threads/processes which are running.

# Linux-threads Linux-processes NT (threads)
1 51 51 60
16 51 67 96
64 50 73 105
128 48 75 107

The modified source code is at
http://colorfullife.com/~manfreds/pagein/pagein.cpp

--
	Manfred




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