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From: John Dyson <dyson>
Message-Id: <199512180515.VAA02759@freefall.freebsd.org>
Subject: Re: ISP state their FreeBSD concerns
To: jgreco@brasil.moneng.mei.com (Joe Greco)
Date: Sun, 17 Dec 1995 21:15:47 -0800 (PST)
Cc: current@freebsd.org
In-Reply-To: <199511121600.KAA26310@brasil.moneng.mei.com> from "Joe Greco" at Nov 12, 95 10:00:34 am
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> 
> > > 8.	File creation (particularly directories) appears to be slow compared
> > > 	to other BSD-like systems.  They say the stats for INN and CNEWS
> > > 	for articles processed per second are quite a bit lower than that
> > > 	on some "other" systems.  They say that file deletion seems to be
> > > 	a bit slower than BSDI, but not by much.  I think they are talking
> > > 	2.0.5 on this item, although one ISP was experimenting with 1026 SNAP.
> > 
> > I am working on this stuff right now.  Give me benchmarks!!!!  I'll
> > do what I can.
> 
> :-(
> 
> I have a little suite of programs I use for performance testing.  The tests
> are absolutely slanted towards news server type applications.  The one in
> particular I will quote is "small-file-write.c", a program that writes 10000
> files in subdirectories, creating the subdirectories if needed (much like a
> news server would do).  So the "first run" numbers include the time needed
> to make dirs:
> 
> Slowaris 5.4 - SS10/30 - 64MB RAM (SCSI II, reasonable drive)
> 
> 10000 files in 332 seconds - first run
> 10000 files in 20 !!! seconds - second run
> 
> Slowaris 5.4 - SS10/30 - 64MB RAM (SCSI II, Barracuda drive)
> 
> 10000 files in 249 seconds - first run
> 10000 files in 13 !!! seconds - second run
> 
> Slowaris 5.4 - SS10/30 - 64MB RAM - PrestoServe (SCSI II, Barracuda drive)
> 
> 10000 files in 76 seconds - first run
> 10000 files in 12 seconds - second run
> 
> FreeBSD 2.0.5R - ASUS SP3G AMD 486DX2/66 + NCR810 - 8MB (SCSI II, reasonable
> drive)
> 
> 10000 files in 620 seconds - first run  :-(  :-(
> 10000 files in 310 seconds - second run  :-( :-( :-( !!
> 
> FreeBSD 1026-SNAP - ASUS SP3G AMD 486DX4/100 + NCR810 - 48MB (SCSI II, SLOW
> drive, fs mounted -o async)
> 
> 10000 files in 569 seconds - first run  :-(  :-(
> 10000 files in 207 seconds - second run  :-( :-( :-( !!
> 
> Now, I can't swear that by tweaking newfs options, etc., it isn't able to
> improve this - I simply haven't tried because I didn't realize until just
> now how abominable this performance was.  Does anybody have advice about
> what might be tweakable to help this?  This is really sad.
> 
> The program itself:
> 
> #include <stdio.h>
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <time.h>
> #include <errno.h>
> 
> char *pathn(int x)
> {
> 	static char *buffer[1024];
> 	int d1, d2, d3;
> 
> 	d1 = x;
> 	x /= 10;
> 	d1 -= x * 10;
> 	d2 = x;
> 	x /= 10;
> 	d2 -= x * 10;
> 	d3 = x;
> 	x /= 10;
> 	d3 -= x * 10;
> 	sprintf(buffer, "%d/%d/%d/%d", d1, d2, d3, x);
> 	return(buffer);
> }
> 
> 
> 
> 
> 
> int writef(char *name)
> {
> 	int fd;
> 	char *ptr;
> 
> 	if ((fd = open(name, O_CREAT|O_RDWR, 0644)) < 0) {
> 		if (errno == ENOENT) {
> 			ptr = name;
> 			while (ptr = strchr(ptr, '/')) {
> 				*ptr = '\0';
> 				if (mkdir(name, 0755) < 0) {
> 					if (errno != EEXIST) {
> 						perror(name);
> 						exit(1);
> 					}
> 				}
> 				*ptr++ = '/';
> 			}
> 			return(writef(name));
> 		} else {
> 			perror(name);
> 			exit(1);
> 		}
> 	} else {
> 		close(fd);
> 	}
> }
> 
> 
> 
> 
> 
> int main()
> {
> 	int i, n;
> 	time_t tm = time(NULL);
> 	n = 10000;
> 
> 	for (i = 0; i < n; i++) {
> 		writef(pathn(i));
> 		if (! (i % 100)) {
> 			printf("%d..", i);
> 			fflush(stdout);
> 		}
> 	}
> 	printf("\n%d files in %d seconds\n", n, time(NULL) - tm);
> 	exit(0);
> }
>