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McDougall's Disk Masher (was: Mac OS X File IO Performance Issue?)

Subject: McDougall's Disk Masher (was: Mac OS X File IO Performance Issue?)
From: Craig Mattocks <email@hidden>
Date: Sat, 30 Jul 2005 00:29:20 -0400
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On Fri, 29 Jul 2005 at 09:07:04 -0700 Michael McDougall <email@hidden> wrote:

I'm trying to nail down a reasonable micro-benchmark we can use
internally at Apple for tracking issues related to File IO Performance.

Okay, worst case results -- my 400 MHz G3 iMac "Special Edition" running Panther:

java FileIO
.

FileOutputStream write 8M (avg) 254
FileOutputStream write 8M (mean) 240


FileInputStream read 8M (avg) 184
FileInputStream read 8M(mean) 184
.

FileOutputStream fill and write 8K avg  856
FileOutputStream fill and write 8K mean 643


FileInputStream read and check 8K avg 696
FileInputStream read and check 8K mean 652

Time: 102.478

OK (2 tests)

java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-141.3)
Java HotSpot(TM) Client VM (build 1.4.2-38, mixed mode)

Beat that!
Craig

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