[pdftex] [tex-live] \pdfelapsedtime

[Heiko Oberdiek]

On Mon, Nov 02, 2009 at 08:23:19AM +1030, Will Robertson wrote:

> On 02/11/2009, at 3:20 AM, Joseph Wright wrote:
> 
> >See the same here on Snow Leopard (MacOS X 10.6.1, Intel) with an up  
> >to date TeX Live, and on Ubuntu (Janty), but not on Windows (TL also  
> >up to date). Not too surprising that the Mac and Ubuntu give the  
> >same result.
> 
> Thanks for the confirmation.

I can also confirm it (Linux). The value 65536 is 1s exactly.
If you wait a little longer:

  \documentclass{article}
  \showthe\pdfelapsedtime
  \begin{document}
  \showthe\pdfelapsedtime
  \end{document}

Then you can see some multiples of 65536.

> Does anyone here know why this might be happening?

Something went wrong with the compilation.

texk/web2c/lib/texmfmp.c contains get_seconds_and_micros:

  get_seconds_and_micros (integer *seconds,  integer *micros)
  {
  #if defined (HAVE_GETTIMEOFDAY)
    struct timeval tv;
    gettimeofday(&tv, NULL);
    *seconds = tv.tv_sec;
    *micros  = tv.tv_usec;
  #elif defined (HAVE_FTIME)
    struct timeb tb;
    ftime(&tb);
    *seconds = tb.time;
    *micros  = tb.millitm*1000;
  #else
    time_t myclock = time((time_t*)NULL);
    *seconds = myclock;
    *micros  = 0;
  #endif
  }

Apparently the micros are always zero, that means, neither
HAVE_GETTIMEOFDAY nor HAVE_FTIME has been set.

texk/web2c/configure doesn't check for ftime and gettimeofday,
but the version of pdftex 1.40.9 does.

(Also texk/web2c/c-auto.in of pdftex 1.40.9 contains:

  /* Define to 1 if you have the `ftime' function. */
  #undef HAVE_FTIME

  /* Define to 1 if you have the `gettimeofday' function. */
  #undef HAVE_GETTIMEOFDAY

1.40.10 misses these lines.)

Yours sincerely
  Heiko <oberdiek at uni-freiburg.de>