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http://bugzilla.novell.com/show_bug.cgi?id=631296

http://bugzilla.novell.com/show_bug.cgi?id=631296#c3


--- Comment #3 from Harald Koenig <koenig@xxxxxxxx> 2010-08-16 16:26:22 UTC ---
(In reply to comment #2)
> Thank you for thinking outside of the box, but I want to know why xfs
> is so much slower here.

because for xfs the file truncation is a (more) synchronous operation then in
ext[234] ?!

here is a small C program to trigger and bench the file truncation (needs one
cmd line arg -- number of files to create/overwrite), kudos to Olaf Flebbe:

--- 8< ------ 8< ------ 8< ------ 8< ------ 8< ------ 8< ------ 8< ---

#include <stdio.h>
#include <stdlib.h>

main(int argc, char *argv[]) {
  FILE *fp;
  char *buf = malloc(64*1024);
  int i;

  for (i = 0; i < atoi(argv[1]); i++) {
          sprintf( buf, "testdat%04d", i);
          fp=fopen( buf,"w");
          fwrite( buf, 1, 64*1024, fp);
          fclose(fp);
  }
}

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