On Sat, 2020-02-29 at 20:14 +0100, Harald Dunkel wrote: > Hi folks, > > looking at the number of cores and highly parallel applications > I wonder if it would be reasonable to increase the default > kernel.pid_max (currently 0x8000) to lets say 0x3fffff? > > Do you expect negative side effects?
It's already 0x400000 on my machine and everything is fine. I haven't (knowingly) tweaked anything so I guess this is the default on recent machines, this laptop is running 5.4.0-3-amd64 (testing userspace, although not updated for a little bit). I can't actually find when/where this changed in recent history -- I've only noticed these large pids in recent months, but it's entirely possible I'm simply not that observant. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=72680a191b934377430032f93af15ef50aafb3a8 was in 2010 and a 2.6.x kernel. Ian.
