From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hans Reiser <reiser@namesys.com>
Subject: Re: Reiser4 unlink performance
Date: Tue, 28 Feb 2006 11:43:08 -0800
Message-ID: <4404A7CC.9030900@namesys.com>
References: <EE7B7176-15E7-43E9-937B-B084879E62A9@hilander.com> <200602262342.23069.zam@namesys.com> <15967723-4F4C-47DF-A621-CEE29E4C6244@hilander.com> <4404A04F.5010902@namesys.com> <5630744B-8F94-4B23-A228-999F04BD3E58@hilander.com>
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To: "Alec H. Peterson" <ahp@hilander.com>
Cc: Alexander Zarochentsev <zam@namesys.com>, reiserfs-list@namesys.com

I meant for Zam to describe it in more detail, sorry about that.  :-/

Hans

Alec H. Peterson wrote:

> Hi Hans,
>
> On Feb 28, 2006, at 12:11, Hans Reiser wrote:
>
>> Please describe it in more detail.
>
>
> Well, the error I'm getting is this:
>
> Feb 21 13:10:22 ecbuild-10 kernel: WARNING: Flushing like mad: 16384
>
> The C program I'm running to do the test is this:
>
> main(int argc, char **argv)
> {
>   char buf[1024];
>   char dir[1024];
>   int i,j,k;
>   int ret;
>   int fd;
>   int *sequence;
>   struct timeval start, unlinktime, end;
>
>   if(argc != 2)
>   {
>     fprintf(stderr, "Usage: %s <base directory>\n", argv[0]);
>     exit(1);
>   }
>
>   strncpy(dir, argv[1], 1024);
>
>   if(chdir(dir))
>   {
>     perror("chdir");
>     exit(1);
>   }
>
>   for(i = 0; i < 256; i++)
>   {
>     snprintf(buf, 1024, "%d", i);
>     ret = mkdir(buf, S_IRWXU);
>     if(ret && (errno != EEXIST))
>     {
>       perror("mkdir");
>       exit(1);
>     }
>   }
>
>
>   {
>     sequence = sequence20000;
>     gettimeofday(&start, NULL);
>     fprintf(stderr, "Starting %d run %d.%d.\n",
>             256 * 20000, start.tv_sec, start.tv_usec);
>
>     for(i = 0; i < 256; i++)
>     {
>       for(j = 0; j < 20000; j++)
>       {
>         snprintf(buf, 1024, "%d/%d", i, j);
>         fd = open(buf, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
>         if(fd == -1)
>         {
>           perror("open");
>           exit(1);
>         }
>         close(fd);
>       }
>       fprintf(stderr, "Done %d\n", i);
>     }
>
>     gettimeofday(&unlinktime, NULL);
>     fprintf(stderr, "Starting %d unlink %d.%d, elapsed time was %d.\n",
>             256 * 20000, unlinktime.tv_sec, unlinktime.tv_usec,
>             unlinktime.tv_sec - start.tv_sec);
>
>     for(i = 0; i < 20000; i++)
>     {
>       for(j = 0; j < 256; j++)
>       {
>         snprintf(buf, 1024, "%d/%d", j, sequence[i]);
>         unlink(buf);
>         if(fd == -1)
>         {
>           perror("unlink");
>           exit(1);
>         }
>       }
>       fprintf(stderr, "Done %d\n", i);
>     }
>
>     gettimeofday(&end, NULL);
>     fprintf(stderr, "Done with %d unlink %d.%d, elapsed time was %d. \n",
>             20000 * 256, end.tv_sec, end.tv_usec,
>             end.tv_sec - unlinktime.tv_sec);
>   }
>
>   exit(0);
> }
>
> sequence20000 is an array which contains a sequence from 1 to 20000 
> randomly ordered.
>
> Alec
>
>
>