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My 32-bit server seems less happy with jemalloc; likely since
munmap is creating holes and it's not using sbrk by default.
jemalloc seems to need large VM space (not actual memory)
to work well, and that isn't a possibility for constrained
32-bit systems.
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The 131072 byte lower bound was the old default before the
sliding mmap window was introduced in modern glibc malloc.
While the sliding mmap window was intended to be faster by
reducing syscalls, zeroing and kernel overhead, it is also prone
to fragmentation from allocation patterns seen in evented Perl
servers.
Individual allocations over 128K are rare in our codebase since
there aren't many messages this large, making any performance
impact tiny. Furthermore, the reduction in fragmentation and
memory use will be a speedup for memory-constrained systems
since they can avoid swap and have more leftover for the page
cache.
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INSTALL now covers more of lei since I'm less uncomfortable
about it for 2.0 and points users towards the install/ helpers
if installing from source.
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But new ideas keep popping into muh brain :x
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Start lowercasing newsgroup names automatically since uppercase
names are incompatible with IMAP and POP3 and also causes
problems with both -extindex and -cindex.
We'll also warn on eidx_key and newsgroup conflicts to avoid
sometimes subtle breakage when using -extindex and -cindex.
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[ew: leave install/README unchanged pending wording changes]
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When import hits blobs it's already seen, we'll add labels
regardless in order to match the behavior of other inexact
matches. This is useful when importing exact copies of
messages which exist in multiple mailboxes.
I noticed this when I had a message imported from my normal IMAP
`INBOX', but also copied it to a different folder for future
reference.
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Did some stuff, still a ton of stuff to do :x
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I'm thinking the -nntpd regression fix will push this release
out sooner rather than later...
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