From owner-freebsd-hackers  Thu Jan 11 12:35: 2 2001
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Date: Thu, 11 Jan 2001 12:34:42 -0800
From: Alfred Perlstein <bright@wintelcom.net>
To: "Brian J. McGovern" <bmcgover@cisco.com>
Cc: hackers@FreeBSD.ORG
Subject: Re: Question about 'open' files....
Message-ID: <20010111123442.H7240@fw.wintelcom.net>
References: <20010111122147.E7240@fw.wintelcom.net> <200101112026.f0BKQJ406592@bmcgover-pc.cisco.com>
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* Brian J. McGovern <bmcgover@cisco.com> [010111 12:26] wrote:
> Just for chuckles, try them in the same directory. That will emulate what
> I've been doing here when having problems.

I don't think so:

#include <fcntl.h>
int main(int argc, char **argv) {
  int x, i, counter;
char    buf[200];
        char buffer[2048];
        memset(buffer, '%', sizeof(buffer));

  for (counter = 0; counter < 20000; counter++)
  {
        sprintf(buf, "files/%s%d", argv[1], counter);
    x = open(buf,O_CREAT | O_WRONLY);
        if (x == -1) {
                perror("open");
                exit(1);
        }
    write(x, buffer, sizeof(buffer));
    close(x);
  }
  return 0;
}
~/tst % gcc t.c
~/tst % for i in a b c d e f g h ; do ./a.out $i & ; done
~/tst % find . | wc -l                                   
   26783
...
~/tst % find . | wc -l
   40524

Sure the directory ops start to get pretty slow once a UFS dir
gets to be this size, but that's just a problem with UFS.

I really can't reproduce this behavior here and can't suggest a
fix unless you can come up with a test program of your own to
produce it.

sorry,
-Alfred


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