On 2007-12-25, Diez B. Roggisch <[EMAIL PROTECTED]> wrote: > Carl K schrieb: >> Grant Edwards wrote: >>> On 2007-12-24, Carl K <[EMAIL PROTECTED]> wrote: >>> >>>>> If it is a multi page pdf Imagemagick will do: >>>>> >>>>> convert file.pdf page-%03d.png >>>> I need python code to do this. It is going to be run on a >>>> someone else's shared host web server, security and >>>> performance is an issue. So I would rather not run stuff via >>>> popen. >>> >>> Use subprocess. >>> >>> Trying to eliminate popen because of the overhead when running >>> ghostscript to render PDF (I assume convert uses gs?) is about >>> like trimming an elephants toenails to save weight. >> >> maybe, but I wouldn't be so sure. >> >> currently the pdf is created in a python StringIO buffer and returned to >> the browser; so it never becomes a file. using convert means I have to >> first save it as a file, convert from file to file, read the file, >> delete the 2 files. so 6 file operations where before there were none. >> That may be more of a load than the ghostscript part. > > So what? I'm not sure about current HD speeds, but a couple of years ago > these were about 30MByte/s - and should be faster today. Which equals > 240MBit/s, much more than your user's internet connection. and this is > raw IO speed, not counting disk caches.
Unless the file is really huge (or the server is overloaded), the bytes will probably never even hit a platter. If you're using any even remotely modern OS, short-lived tempfiles used as you desdcribe are basically just memory-buffers with a filesystem API. -- Grant -- http://mail.python.org/mailman/listinfo/python-list
