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The MH format is widely-supported and used by various MUAs such
as mutt and sylpheed, and a MH-like format is used by mlmmj for
archives, as well. Locking implementations for writes are
inconsistent, so this commit doesn't support writes, yet.
inotify|EVFILT_VNODE watches aren't supported, yet, but that'll
have to come since MH allows packing unused integers and
renaming files.
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This has several advantages:
* no need to use ipc.lock to protect a pipe for non-atomic writes
* ability to pass FDs. In another commit, this will let us
simplify lei->sto_done_request and pass newly-created
sockets to lei/store directly.
disadvantages:
- an extra pipe is required for rare messages over several
hundred KB, this is probably a non-issue, though
The performance delta is unknown, but I expect shards
(which remain pipes) to be the primary bottleneck IPC-wise
for lei/store.
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There's no need to alias net_merge_all in each WQ class
which uses LeiAuth, `$obj->$sub' works even when `$sub'
is a fully-qualified subroutine name with `::' in it.
perlobj(1) documents it under "Method Call Variations".
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I was calling "child_error(1, ...)" in a few places where I meant
to be calling "child_error(1 << 8, ...)" and inadvertantly
triggering SIGHUP in script/lei. Since giving a zero exit code
to child_error makes no sense, just allow falsy values to
default to 1 << 8.
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And fix "lei index" completion while we're at it.
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On a 4-core CPU, this speeds up "lei import" on a largish
Maildir inbox with 75K messages from ~8 minutes down to ~40s.
Parallelizing alone did not bring any improvement and may
even hurt performance slightly, depending on CPU availability.
However, creating the index on the "fid" and "name" columns in
blob2name yields us the same speedup we got.
Parallelizing IMAP makes more sense due to the fact most IMAP
stores are non-local and subject to network latency.
Followup-to: bdecd7ed8e0dcf0b45491b947cd737ba8cfe38a3 ("lei import: speed up kw updates for old IMAP messages")
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Since completely purging blobs from git is slow, users may wish
to index messages in Maildirs (and eventually other local
storage) without storing data in git.
Much code from LeiImport and LeiInput is reused, and a new dummy
FakeImport class supplies a non-storing $im->add and minimize
changes to LeiStore.
The tricky part of this command is to support "lei import"
after a message has gone through "lei index". Relying on
$smsg->{bytes} == 0 (as we do for external-only vmd storage)
does not work here, since it would break searching for "z:"
byte-ranges when not using externals.
This eventually required PublicInbox::Import::add to use a
SharedKV to keep track of imported blobs and prevent
duplication.
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