On Thu, Jun 29, 2017 at 1:21 PM, Guy Harris <g...@alum.mit.edu> wrote:
> On Jun 29, 2017, at 3:48 AM, John Thacker <johnthac...@gmail.com> wrote: > > > I believe the main reason is that Fedora defaults /tmp to tmpfs ( > https://fedoraproject.org/wiki/Features/tmp-on-tmpfs) which thus limits > it to the size of RAM (half that, at default). > > Does Linux not have a *virtual* memory-based tmpfs, such as the one that > Sun developed back in the late 1980's, allowing pages from temporary files > either to be in memory or swap space? > > Ah, to be correct, it is possible to set it to more than the amount of physical RAM, and it will use swap at that point (see https://www.kernel.org/doc/Documentation/filesystems/tmpfs.txt as well as someone actually testing it https://unix.stackexchange.com/questions/237030/how-safe-is-it-to-increase-tmpfs-to-more-than-physical-memory) but it's set to a defined maximum at mount time and has to be remounted to change. I've never actually set it to larger than my amount of RAM. I suspect that Fedora simply found it easier to leave the default and then change large files to use /var/tmp The Sun version was the inspiration; the old Linux ramfs that tmpfs replaced was limited to the size of RAM, and thus not as flexible. John
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