Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!edi386!eddjp
From: eddjp@edi386.UUCP ( Dewey Paciaffi )
Newsgroups: comp.benchmarks
Subject: Sparcstation 2 Write I/O
Message-ID: <152@edi386.UUCP>
Date: 13 Feb 91 21:41:59 GMT
Organization: J.M. Huber Corp. Edison, NJ
Lines: 44


I've found an anomaly I can't explain on my borrowed Sparcstation 2.
I've been running the Byte Magazine Benchmarks and the file I/O times
were surprisingly low, around 270 kb / sec. on read and writes.

In attempting to isolate any problem with the bench program, I shut off
the write portion of the test, and read an old test file. The results
were in the 1.2 - 1.4 MB range. Turning this around I changed the program
to write only, and still averaged about 270 kb.

To be completely sure that the benchmark program didn't have some latent
bug that I hadn't found, I ran the following test and again can only 
write about 270 - 290 kb/sec. The system is quiet except for this test.

Could someone verify these results or (hopefully) refute them? Remember
that this is a loaner machine, and I'm not sure how well tuned it may
be. The disk comes up Synchronous, and remains so as far as I can tell.

======== Cut Here ========== Cut Here =========== Cut Here =============

#include <fcntl.h>

#define BUFFSIZE 1024

main()
{
	int file;
	int c = 0;
	char buffer[BUFFSIZE];

	file = open("./dummy0", O_WRONLY | O_CREAT | O_TRUNC );
	
	while ( c++ != 2000 )
		if ( (write(file,buffer,BUFFSIZE)) == -1 )
		{
			perror("Write");
			break;
		}

	close(file);
}
	
-- 
Dewey Paciaffi           ...!uunet!edi386!eddjp