Package: gphoto2
Version: 2.3.1-2
Severity: normal
Bug 372166 talks about a major error holding the entire set of objects
in RAM before writing to disk.
this error is much more narrow: gphoto2 appears to hold an individual
object entirely in RAM before writing it to disk. It appears to do
this for me when i run "gphoto -P" to connect to my canon PowerShot
SD200, anyway.
This isn't a problem (today) for normal hosts, normal cameras, and
normal (still) photos. But it's a problem for movies or other
extremely large files, or for embedded hosts.
My camera can take movies. I have a couple 1GB movie files on it. I
have a low-end machine with 256MB RAM (or even as low as 32MB RAM, in
the case of my debian ARM device). I want to transfer those 1GB movie
files to disk via gphoto2. Pulling the entire movie into RAM is
prohibitively expensive because of the massive swapping that results.
The cutoff of what should be spooled directly to disk (as opposed to
what can be cached in RAM) would ideally be related to the amount of
physical memory in the host system (or the amount allowed to the
running user). Or maybe *every* object should be spooled to a local
temporary file and then renamed to the proper name when complete? I'm
not sure what the downside would be there. Maybe this is a job for
mmap()? Sorry that i don't have any concrete suggestions or patches
to offer at this point.
Thanks for keeping gphoto2 in debian! it's very handy.
Regards,
--dkg
-- System Information:
Debian Release: lenny/sid
APT prefers testing
APT policy: (500, 'testing'), (200, 'unstable'), (101, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.18-4-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gphoto2 depends on:
ii libc6 2.5-9+b1 GNU C Library: Shared libraries
ii libcdk5 5.0.20060507-1 C-based curses widget library
ii libexif12 0.6.15-1 library to parse EXIF files
ii libgphoto2-2 2.3.1-5 gphoto2 digital camera library
ii libgphoto2-port0 2.3.1-5 gphoto2 digital camera port librar
ii libjpeg62 6b-13 The Independent JPEG Group's JPEG
ii libncurses5 5.6-3 Shared libraries for terminal hand
ii libpopt0 1.10-3 lib for parsing cmdline parameters
ii libreadline5 5.2-3 GNU readline and history libraries
ii libusb-0.1-4 2:0.1.12-7 userspace USB programming library
gphoto2 recommends no packages.
-- no debconf information
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