On Thu, 21 Jul 2016 17:19:27 +0530 Ritesh Raj Sarraf <rrs@debian.org> wrote: > Hi, > > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=831998 > > This bug is an example of the problem. I am bringing it here to know > views of fellow developers. > > > I am not sure if there's an fd.o defined standard for environment > variables, but a quick web search pointed to the IEEE and Open Group > link. > http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html > > None of the standards talk about where TMPDIR should be pointing to. > On GNU/Linux, I recollect it pointing to /tmp and always wondered > what environment variable would point to /var/tmp > > On the Debian front, I can't recollect what our official stand is. I > could find a conversation at the following link. It is fairly recent > from 2012. https://lists.debian.org/debian-devel/2012/06/msg00311.html > > My /tmp is on tmpfs. I just don't recollect if it was the default or > I enabled it explicitly. Currently, it is managed by systemd, but I > do recollect initscripts providing similar feature. > > ● tmp.mount - Temporary Directory > Loaded: loaded (/usr/share/systemd/tmp.mount; enabled; vendor > preset: enabled) > Active: active (mounted) since Wed 2016-07-20 21:50:05 IST; 19h ago > Where: /tmp > What: tmpfs > Docs: man:hier(7) > http://www.freedesktop.org/wiki/Software/systemd/APIFileSystems > CGroup: /system.slice/tmp.mount > > Jul 20 21:50:05 learner systemd[1]: tmp.mount: Directory /tmp to > mount over is not empty, mount > Jul 20 21:50:05 learner systemd[1]: Mounting Temporary Directory... > Jul 20 21:50:05 learner systemd[1]: Mounted Temporary Directory. > > > > Now, back to the actual problem. For many applications, we rely on > the TMPDIR environments. Tools like Python's modules help use these > variables and not worry about the underneath platform. > > Under Linux, with /tmp more commonly on tmpfs, how are developers > dealing with it? tmpfs is limited and multi gigabyte operations may > end up filling it all (as is the case in the debdelta bug report > above). As a drive backend, why doesn't swap work for this? There's no mention of swap in the original bug report. > The whole idea of tmpfs for /tmp was performance. Email attachments > could be temporarily opened under tmpfs > > > But what do we do about larger operations where temporary data may > have the possibility of being huge. I think most video/audio > transcoding workflows may be hit by this. > > Should there be another TPMDIR? Like DTMPDIR, pointing to the > underneath disk, where size is limited by the capacity available to > partition/disk ? > > This could allow developers to choose one over the other based on > their needs. It could also help standardize it as a fallback. > > -- > Given the large number of mailing lists I follow, I request you to CC > me in replies for quicker response -- Neil Williams ============= http://www.linux.codehelp.co.uk/
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