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  • That's not the question. Where are the defaults set? That is, if you don't write to shmmax yourself, what does it default to? Commented Jun 14, 2017 at 2:09
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    On some Linux distros (RHEL 5&6 I believe is one) it is set in /etc/sysctl.conf. But I think the default is set in the kernel code to the theoretical limit (guessing that's 2^64 - 1?). Commented Jun 14, 2017 at 2:48
  • Wolfram-Alpha says: 2^64-1 = 18446744073709551615 which isn't the number he is looking for. Commented Feb 18, 2024 at 4:11