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Previously, all ETS tables used centralized counter variables to keep
track of the number of items stored and the amount of memory
consumed. These counters can cause scalability problems (especially on
big NUMA systems). This commit adds an implementation of a
decentralized counter and modifies the implementation of ETS so that
ETS tables of type ordered_set with write_concurrency enabled use the
decentralized counter. [Experiments][1] indicate that this change
substantially improves the scalability of ETS ordered_set tables with
write_concurrency enabled in scenarios with frequent `ets:insert/2`
and `ets:delete/2` calls.
The new counter is implemented in the module erts_flxctr
(`erts_flxctr.h` and `erts_flxctr.c`). The module has the suffix
flxctr as it contains the implementation of a flexible counter (i.e.,
counter instances can be configured to be either centralized or
decentralized). Counters that are configured to be centralized are
implemented with a single counter variable which is modified with
atomic operations. Decentralized counters are spread over several
cache lines (how many can be configured with the parameter
`+dcg`). The scheduler threads are mapped to cache lines so that there
is no single point of contention when decentralized counters are
updated. The thread progress functionality of the Erlang VM is
utilized to implement support for linearizable snapshots of
decentralized counters. The snapshot functionality is used by the
`ets:info/1` and `ets:info/2` functions.
[1]: http://winsh.me/ets_catree_benchmark/flxctr_res.html
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erts: Optimize arithmetic ops using overflow intrinsics
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* john/merge-re-replace-fix:
erts: Skip ERTS_NOINLINE on non-GCC-compatible compilers
cleanup: beam_emu.c: use ERTS_NOINLINE instead of NOINLINE
stdlib: fix re:replace on LTO builds
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The wrong allocator type was given to erts_free.
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We don't check for io errors as the pollset will be unstable.
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Complementory fix to 922fd355831575965
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The edep->data values need to be 64-bit aligned as it
contains 64-bit values.
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Cannot do unaligned word writes on sparc!
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Incorrect precidence rules made the driver never
deselect the given fds.
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* bjorn/erts/cuddle-with-tests:
statistics_SUITE: Make wall_clock_update/1 more tolerant
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__declspec(noinline) works fine on MSVC but requires us to place
the macro before a function rather than after, which in turn causes
early versions of GCC to puke since they only accept __attribute__
at the end of a function declaration.
Since this is a new macro that previously only saw use in beam_emu,
I figured it's easiest to leave it disabled on MSVC.
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Measurements show that i_minus instructions (subtraction) are
frequent enough to warrant creating specialized i_minus instructions.
Thanks to José Valim for doing instruction counting on
Elixir code.
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OTP-15715
* lukas/erl_docgen/add-internal-docs:
cerl_clauses: Fix broken link
Fix minor typos
Add CountingInstructions to the internal documentation
GarbageCollection.md: Fix links to references
emd2exml: Remove paragraphs around image tags
emd2exml: Clean emphasis markers in link texts
emd2exml: Allow short names of anchors for internal links
Include figures
erts: Fix more internal docs xmllint
compiler: Add internal docs section
erl_docgen: Add new internal docs chapter to docs
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* bjorn/doc/fix-broken-links:
Fix broken links
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PR 2194, stdlib: fix re:replace on LTO builds
* trofi/master:
cleanup: beam_emu.c: use ERTS_NOINLINE instead of NOINLINE
stdlib: fix re:replace on LTO builds
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A multitude of broken links were found when a bug was fixed
in the link checker.
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AGAIN
* sverker/enable-big-creation/OTP-15603:
erts: Document new EPMD response ALIVE2_X_RESP
erl_interface: Support 32-bit creation local cnode
jinterface: Remove old encoding of pid,port,refs
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* john/erts/cuddle-efile-suite:
efile_SUITE: Fix proc_zero_sized_files on systems with empty /proc
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* maint:
Updated OTP version
Prepare release
# Conflicts:
# OTP_VERSION
# make/otp_version_tickets_in_merge
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This test would fail on some versions of FreeBSD because /proc was
present but empty.
This commit makes the test fail if and only if a known zero-sized
file is found and turns out to be empty empty.
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* john/kernel/cuddle-file-suite:
file_name_SUITE: Darwin 18 broke support for 'icky' names
file_SUITE: Ignore EILSEQ on Darwin in +fnu/latin1 test
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Signed-off-by: Sergei Trofimovich <[email protected]>
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Fabio Coatti reported elixir build failure in https://bugs.gentoo.org/681778.
The minimal reproducer looks like that (from otp git tree):
$ ./configure CFLAGS='-O2 -flto' LDFLAGS='-O2 -flto=8'
$ make
$ ERL_TOP=$PWD \
PATH=$ERL_TOP/bin:$PATH \
\
bin/erl \
\
-noshell -eval 're:replace("a","b","c",[{return,list}]).' \
-s erlang halt
{"init terminating in do_boot",{badarg,[{re,replace,["a","b","c",[{return,list}]],
[{file,"re.erl"},{line,362}]},
{erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,680}]},
{init,start_it,1,[]},
{init,start_em,1,[]},
{init,do_boot,3,[]}]}}
init terminating in do_boot ({badarg,[{re,replace,[[_],[_],[_],[_]],[{_},{_}]},
{erl_eval,do_apply,6,[{_},{_}]},{init,start_it,1,[]},{init,start_em,1,[]},{init,do_boot,3,[]}]})
Crash dump is being written to: erl_crash.dump...done
The failure happens in libpcre2 where stack overflow is mis-identified
at function entry of
erts_pcre_compile2()
compile_regex()
if (PUBL(stack_guard) != NULL && PUBL(stack_guard)())
{
*errorcodeptr= ERR85;
return FALSE;
}
The stack "overflow" detection happens in
thr_wrapper()
ethr_set_stacklimit__()
because the stack usage code relies on the fact that ethr_set_stacklimit__()
and similar functions don't get inlined into callers for stack growth
measurement.
Before the change inlining avoidance was achieved by putting functions
into standalone translation units. LTO makes this technique inefficient.
The change marks functions explicitly as __attribute__((__noinline__)) on gcc.
Reported-by: Fabio Coatti
Bug: https://bugs.gentoo.org/681778
Signed-off-by: Sergei Trofimovich <[email protected]>
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* sverker/process_info-reductions-fix/OTP-15709:
erts: Fix bug in process_info(reductions)
erts: Use ptr_val for pointer in gc msg copy
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* sverker/process_info-reductions-fix/OTP-15709:
erts: Fix bug in process_info(reductions)
erts: Use ptr_val for pointer in gc msg copy
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This commit fixes a bug that could cause a crash or memory usage to
grow until the machine ran out of memory when adding a key-value pair
to a map. This could happen when inserting a new key-value pair with a
key K1 containing a binary B1 into a map M having a key K2 with a
binary B2 if the following conditions were met:
* size(B1) >= 4294967296
* size(B2) >= 4294967296
* size(M) >= 32
* (size(B1) rem 4294967296) == (size(B2) rem 4294967296)
* the first (size(B1) rem 4294967296) bytes are the same both in B1
and B2
* substituting B1 in K1 with B2 would result in a term with the same
value as K2
The root cause of the bug is that the map implementation only hashed
the first (X modulo 4294967296) bytes of binaries so that different
binaries could get hashed to the same hash value independently of the
hash seed.
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tty: document ^] keystroke
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There's no way to create the file in question, so we may as well
skip the test.
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returning incorrect result as
* current process might not be RUNNING in which case REDS_IN
is actually used as def_arg_reg[5]
* FCALLS might not have been swapped out
* the SAVED_CALLS case was wrong and returned number of reds left
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Cherry-pick: 3d7d66b84b69f3eb42e8bcd8dc510b6676e31cac
Without this fix asserts would trigger in debug build
but nothing else would break.
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* john/erts/remove-destructive-bs_get_binary2/ERL-901:
erts: Remove unsafe bs_get_binary2 optimization from loader
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A load-time optimization assumed that match contexts had no further
uses when a bs_get_binary2 overwrote the match context's register,
and figured it would be safe to reuse the match context's memory
for the resulting binary.
This is no longer safe as of OTP 22, as a match context may be
reused after being passed to another function.
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* john/erts/seq_trace-sigq-clearing/OTP-15704:
erts: Handle all signal types when clearing seq_trace token
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We walk through all signal queues in the system when clearing
seq_trace, so we must be prepared to encounter all kinds of
signals.
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Fix the unsafe load-time optimization introduced in 07bdbb3a1edc.
https://bugs.erlang.org/browse/ERL-899
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