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git multi-pack-index files were creating swap storms and OOM-ing
on my system; so providing an option to disable it seems prudent
given the minor startup time regression.
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alarm(2) delivering SIGALRM seems sufficient for Xapian since
Xapian doesn't block signals (which would necessitate the use of
SIGKILL via RLIMIT_CPU hard limit). When Xapian gets stuck in
`D' state on slow storage, SIGKILL would not make a difference,
either (at least not on Linux).
Relying on RLIMIT_CPU is also trickier since we must account for
CPU time already consumed by a process for unrelated requests.
Thus we just rely on a simple alarm-based timeout. This also
avoids requiring the optional BSD::Resource module in the (mostly)
Perl implementation (and avoids potential bugs given my meager
arithmetic skills).
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When read-only daemons reopen log files via SIGUSR1, be sure to
propagate it to Xapian helper processes to ensure old log files
can be closed and archived.
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Only public-facing daemons use it, currently, and all
public-facing daemons will pre-spawn it as early as feasible.
lei will need it eventually to handle queries requiring C++,
but I'm not certain what path to take with lei, yet...
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We should almost always be calling `check_build' instead of
`build'. Using ccache masked some of the overhead from
this, but various linker implementations are still slow.
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Xapian helper processes are disabled by default once again.
However, they can be enabled via the new `-X INTEGER' parameter.
One big positive is the Xapian helpers being spawned by the
top-level daemon means they can be shared freely across all
workers for improved load balancing and memory reduction.
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We need to be able to handle resource limitation errors in
public-facing daemons.
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While existing callers are private (lei, *-index, -watch) are
private, we should not be blocking the event loop in
public-facing servers when we hit ETOOMANYREFS, ENOMEM, or
ENOBUFS.
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We were already silently relying on v5.10 features (`//') and
all the regexps to work correctly with v5.12 unicode_strings.
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systemd setups may use role accounts (e.g. `news') with
XDG_CACHE_HOME unset and a non-existent HOME directory
which the user has no permission to create.
In those cases, fallback to using PERL_INLINE_DIRECTORY if
available for building the just-ahead-of-time C++ binary.
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The C++ version of xap_helper will allow more complex and
expensive queries. Both the Perl and C++-only version will
allow offloading search into a separate process which can be
killed via ITIMER_REAL or RLIMIT_CPU in the face of overload.
The xap_helper `mset' command wrapper is simplified to
unconditionally return rank, percentage, and estimated matches
information. This may slightly penalize mbox retrievals and
lei users, but perhaps that can be a different command entirely.
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This makes upcoming changes easier to understand.
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Retrieving Xapian document terms, data (and possibly values) and
transferring to the Perl side would be an increase in complexity
and I/O both the Perl and C++ sides. It would require more I/O
in C++ and transient memory use on the Perl side where slow mset
iteration gives an opportunity to dictate memory release rate.
So lets ignore the document-related stuff here for now for
ease-of-development. We can reconsider this change if dropping
Xapian Perl bindings entirely and relying on JAOT C++ ever
becomes a possibility.
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It's never straightforward to pick an ideal number of processes
for anything and Xapian helper processes are no exception since
there may be a massive disparities in CPU count and I/O
performance. So default to a single worker for now in the C++
version since that's the default is for the Perl/(XS|SWIG)
version, and also the same as for our normal public-facing
daemons.
This keeps the behavior between the Perl+(XS|SWIG) and C++
version as similar as possible.
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It hasn't been used since 2016 when we started working on
improved streamability of gigantic responses.
Fixes: 95d4bf7aded4 (atom: switch to getline/close for response bodies, 2016-12-03)
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Write barriers can take a long time to finish, especially when
commands are issues in parallel. So handle it asynchronously
without blocking lei-daemon by making EOFpipe a little more
flexible by supporting arguments to the callback function.
This is another step towards improving parallel use of lei.
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Schedule a timer to stop shard workers and the git-cat-file
process after a `barrier' command. This allows us to save some
memory again when the lei-daemon is idle but preserves the fork
overhead reduction when issuing many commands in parallel or in
quick succession.
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barrier (synchronous checkpoint) is better than ->done with
parallel lei commands being issued (via '&' or different
terminals), since repeatedly stopping and restarting processes
doesn't play nicely with expensive tasks like `lei reindex'.
This introduces a slight regression in maintaining more
processes (and thus resource use) when lei is idle, but that'll
be fixed in the next commit.
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Since data going to git is the most important, always ensure
data is written to git before attempting to write anything to
SQLite or Xapian.
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Noticed while working on other things...
Fixes: 299aac294ec3 (lei: do label/keyword parsing in optparse, 2023-10-02)
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We shouldn't attempt to reap a process again after it's been
reaped asynchronously in the SIGCHLD handler. Noticed while
working on changes to get lei/store to use checkpointing.
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This should improve `lei blob' and `lei rediff' functionality
for folks relying on `lei index' and allows future work to
improve parallelism via checkpointing in lei/store.
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This adds support for the "POST /$INBOX/$MSGID/?x=m?q=..."
added last year to support per-thread searches
764035c83 (www: support POST /$INBOX/$MSGID/?x=m&q=, 2023-03-30)
This only supports instances of public-inbox since 764035c83,
but unfortunately there hasn't been a release since then.
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Noticed while trying to make other reliability improvements to
lei...
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By reducing internal event loop iterations, this brings 300+
inboxes down ~32ms to ~27ms. It should also be more consistent
on servers with busy event loops since all the Xapian DB traffic
happens at once, theoretically mproving cache utilization.
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This fixes compile errors on platforms we can't explicitly
support from pure Perl due to the lack of syscall stability
guarantees by the OS developers.
Reported-by: Gaelan Steele <gbs@canishe.com>
Tested-by: Gaelan Steele <gbs@canishe.com>
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There are still some places where on_destroy isn't suitable,
This gets rid of getpid() calls in most of those cases to
reduce syscall costs and cleanup syscall trace output.
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getpid() isn't cached by glibc nowadays and system calls are
more expensive due to CPU vulnerability mitigations. To
ensure we switch to the new semantics properly, introduce
a new `on_destroy' function to simplify callers.
Furthermore, most OnDestroy correctness is often tied to the
process which creates it, so make the new API default to
guarded against running in subprocesses.
For cases which require running in all children, a new
PublicInbox::OnDestroy::all call is provided.
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PID guards for OnDestroy will be the default in an upcoming
change. In the meantime, LeiMirror was the only user and
didn't actually need it.
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While PublicInbox::Config is responsible for some instances of
setting $git->{nick}, more PublicInbox::Git objects may be
created from loading the cindex and we should do our best to
reuse that memory, too.
Followup-to: 84ed7ec1c887 (dedupe inbox names, coderepo nicks + git dirs, 2024-03-04)
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With my current mirror of lore + gko, this saves over 300K
allocations and brings the allocation count in this area down
to under 5K. The reduction in AV refs saves around 45MB RAM
according to measurements done live via Devel::Mwrap.
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Wrap the entire solver command chain with a dedicated limiter.
The normal limiter is designed for longer-lived commands or ones
which serve a single HTTP request (e.g. git-http-backend or
cgit) and not effective for short memory + CPU intensive commands
used for solver.
Each overall solver request is both memory + CPU intensive: it
spawns several short-lived git processes(*) in addition to a
longer-lived `git cat-file --batch' process.
Thus running parallel solvers from a single -netd/-httpd worker
(which have their own parallelization) results in excessive
parallelism that is both memory and CPU-bound (not network-bound)
and cascade into slowdowns for handling simpler memory/CPU-bound
requests. Parallel solvers were also responsible for the
increased lifetime and frequency of zombies since the event loop
was too saturated to reap them.
We'll also return 503 on excessive solver queueing, since these
require an FD for the client HTTP(S) socket to be held onto.
(*) git (update-index|apply|ls-files) are all run by solver and
short-lived
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Fortunately, this only affects `--multi-accept=' users, with
`--multi-accept=-1' users getting infinite loops.
I noticed this when EMFILE was reached on my setup, but any
error should cause us to give up accept(2) (at least
temporarily) and allow work for other items in the event loop to
be processed.
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We must chomp the newline in the branch name if it's set.
Reported-by: Rob Herring <robh@kernel.org>
Link: https://public-inbox.org/meta/CAL_JsqK7P4gjLPyvzxNEcYmxT4j6Ah5f3Pz1RqDHxmysTg3aEg@mail.gmail.com/
Fixes: 73830410e4336b77 (treewide: use run_qx where appropriate, 2023-10-27)
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This allows accurate reporting of the error location and can be
made to dump a Perl backtrace via PERL5OPT='-MCarp=verbose'.
Noticed while tracking down fast-import failures.
Link: https://public-inbox.org/meta/CAL_JsqK7P4gjLPyvzxNEcYmxT4j6Ah5f3Pz1RqDHxmysTg3aEg@mail.gmail.com/
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Noticed while tracking down fast-import crash bug report.
Link: https://public-inbox.org/meta/CAL_JsqK7P4gjLPyvzxNEcYmxT4j6Ah5f3Pz1RqDHxmysTg3aEg@mail.gmail.com/
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Inbox names, coderepo nicks, git_dir values are used heavily
as hash keys by the read-only coderepo WWW pieces.
Relying on CoW for mutable scalars on newer Perl doesn't work
well since CoW for those scalars are limited to 256 CoW references
and blow past that number when mapping thousands of coderepos
and inboxes to each other. Instead, make the hash key up-front
and get the resulting string to point directly to the pointer
used by the hash key.
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It's not really relevant at the moment, but a sufficiently
smart implementation could eventually save some memory here.
Perl already optimizes in-place sort (@x = sort @x), so there's
precedent for a potential future where a Perl implementation
could generally optimize in-place operations for non-builtin
subroutines, too.
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Repeatedly allocating an anonymous sub is an expensive operation
and a potential source of leaks in older Perl. Instead,
`local'-ize a global and use a permanent sub to workaround the
old Encode 2.87..3.12 leak.
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We are just using the odd ref+deref (`${\...}') syntax and
don't need to calculate line numbers ourselves, nowadays.
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While fast build times from -O0 is critical to my sanity when
actively working on C++, the files installed via package
managers or `make install' aren't likely to change frequently.
In that case, expensive -O2 optimizations make sense since the
10-20s saved from a single large --join more than covers the
cost of waiting on g++ to optimize.
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If publicinbox.cgitrc is set in the config file, we'll ensure
cgit sees it as CGIT_CONFIG since the configured
publicinbox.cgitrc knob may not be the default path the cgit.cgi
binary was configured to use.
Furthermore, we'll respect CGIT_CONFIG in the environment if
publicinbox.cgitrc is unset in the config file at -httpd/-netd
startup.
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The "patch is too large to show" text is now broken by an <hr>
to prevent it from being confused as part of a commit message
(or having somebody intentionally insert that text in a commit
message to confuse readers). A missing </pre> is also necessary
before the <hr> tag for the related commit search form.
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Similar to commit cbe2548c91859dfb923548ea85d8531b90d53dc3
(www_coderepo: use OnDestroy to render summary view,
2023-04-09), we can rely on OnDestroy and Qspawn to run
dependencies in a structured way and with some extra parallelism
for SMP users.
Perl (as opposed to POSIX sh) allows us to easily avoid
expensive patch generation for large root commits, and also avoid
needless `git patch-id' invocations for patches which are too
big to show.
Avoiding patch-id alone saved nearly 2s from the linux.git root
commit[1] with patch generation enabled and brought response
times down to ~6s (still slow). Avoiding patch generation for
root commits brings it down to a few hundred milliseconds on a
public-facing server (nobody wants a 355MB patch rendered as
HTML, right?).
[1] torvalds/linux.git 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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SIGPIPE (13) can be quite common with unreliable connections
and impatient clients, so just ignore them.
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Štěpán Němec <stepnem@smrk.net> wrote:
> Eric Wong wrote:
> > Subject: [PATCH] view: decode In-Reply-To comments added by Gnus
> Or just "some MUAs"? Who knows who else...
Yeah, I wouldn't be surprised if there were more...
---8<---
Subject: [PATCH] view: decode In-Reply-To comments added by some MUAs
Emacs-based MUAs (e.g. Gnus and rmail) can do it, and maybe
some others, too. I noticed it in
<https://yhbt.net/lore/git/xmqqr0ho9oi9.fsf@gitster.g/>
while scanning for something else.
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Setting $SIG{__WARN__} at the top-level no longer has any effect
since we localize $SIG{__WARN__} when entering ->event_step on
a per-listener basis.
Fixes: 60d262483a4d (daemon: use per-listener SIG{__WARN__} callbacks, 2022-08-08)
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The packaged Perl on OpenBSD i386 supports 64-bit file offsets
but not 64-bit integer support for 'q' and 'Q' with `pack'.
Since servers aren't likely to require lock files larger than
2 GB (we'd need an inbox with >2 billion messages), we can
workaround the Perl build limitation with explicit padding.
File::FcntlLock isn't packaged for OpenBSD <= 7.4 (but should be
in future releases), but I can test i386 OpenBSD on an extremely
slow VM.
Big endian support can be done, too, but I have no idea if
there's 32-bit BE users around nowadays...
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MH sequence numbers can be analogous to IMAP UIDs and NNTP
article numbers (or more like IMAP MSNs with clients which
pack). In any case, sort then numerically by default to avoid
surprising users who treat NNTP spools and mlmmj archives as MH
folders. This gives more coherent git history and resulting
NNTP/IMAP numbering when round-tripping MH -> v2 -> (NNTP|IMAP) -> MH
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We don't need multiple `use PublicInbox::IO' statements to
import a subroutine.
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