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Failure to close channel causes GC crash #5770

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p6rt opened this issue Oct 24, 2016 · 7 comments
Closed

Failure to close channel causes GC crash #5770

p6rt opened this issue Oct 24, 2016 · 7 comments
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@p6rt
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p6rt commented Oct 24, 2016

Migrated from rt.perl.org#129949 (status was 'resolved')

Searchable as RT129949$
@p6rt
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p6rt commented Oct 24, 2016

From doug@theschrags.net

This probably is an issue with moarvm.

When trying to benchmark the concurrent and non-concurrent versions of
Damien Conway's 'bogosort' algorithm, I ran into numerous problems with
Rakudo Star 2016.07 - depending on the MAX_RAKUDO_THREADS setting, the
process might succeed, or it might slowly eat up all of memory, and if
more than a few threads were used only some would actually process
anything (accumulate CPU time). rakudo-star-2016.10-RC0 looks like it
solved the deadlock problem, so that all threads are actually working.

However, now this version of the program crashes after the first thread
completes with​:
  Internal error​: zeroed target thread ID in work pass

or occasionally​:
  Internal error​: invalid thread ID 8770096 in GC work pass

Test runs​:

doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
1 seconds.
Internal error​: invalid thread ID 8770096 in GC work pass
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
4 seconds.
Internal error​: zeroed target thread ID in work pass
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
24 seconds.
Internal error​: zeroed target thread ID in work pass
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
6 seconds.
Internal error​: zeroed target thread ID in work pass

I also found that the problem is likely related to a channel not being
explicitly closed, so I was able to get normal test runs as follows​:

[ With a LEAVE block to close the channels ]

doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
4 seconds.
[e i l p r s x]
29 seconds.
[e i l p r s x]
57 seconds.
[e i l p r s x]
58 seconds.
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
4 seconds.
[e i l p r s x]
10 seconds.
[e i l p r s x]
20 seconds.
[e i l p r s x]
31 seconds.

I'm figuring that failing to close the channels is bad practice to start,
but we don't really want to crash the VM with an obscure error message.
Also, I saw a bug report earlier this year where this message was
produced, but closed because of uncertainty in reproducing it. This test,
however fails quite repeatably, at least on my system (linux).

Code file is attached. System report follows.

Doug Schrag <><
aka dmaestro
Houston, TX
Traverse City, MI

Summary of my perl5 (revision 5 version 18 subversion 1) configuration​:

  Platform​:
  osname=linux, osvers=3.10.9, archname=x86_64-linux-thread-multi
  uname='linux hive64 3.10.9 #​1 smp wed aug 21 14​:50​:51 cdt 2013 x86_64
amd phenom(tm) ii x6 1100t processor authenticamd gnulinux '
  config_args='-de -Dprefix=/usr -Dsiteprefix=/usr/local
-Dsitelib=/usr/local/share/perl5 -Dsitearch=/usr/local/lib64/perl5
-Darchlib=/usr/lib64/perl5 -Dvendorprefix=/usr -Dprivlib=/usr/share/perl5
-Dvendorlib=/usr/share/perl5/vendor_perl
-Dvendorarch=/usr/lib64/perl5/vendor_perl -Dscriptdir=/usr/bin
-Dcccdlflags=-fPIC -Dinstallprefix=/usr -Dlibpth=/usr/local/lib64
/usr/lib64 /lib64 -Doptimize=-O2 -fPIC -Dusethreads -Duseithreads
-Duseshrplib -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr
-Darchname=x86_64-linux'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
  use64bitint=define, use64bitall=define, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing
-pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64',
  optimize='-O2 -fPIC',
  cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe
-fstack-protector -I/usr/local/include'
  ccversion='', gccversion='4.8.1', gccosandvers=''
  intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
  ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -fstack-protector'
  libpth=/usr/local/lib64 /usr/lib64 /lib64
  libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
  perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
  libc=/lib64/libc-2.17.so, so=so, useshrplib=true, libperl=libperl.so
  gnulibc_version='2.17'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E
-Wl,-rpath,/usr/lib64/perl5/CORE'
  cccdlflags='-fPIC', lddlflags='-shared -O2 -fPIC -fstack-protector'

Characteristics of this binary (from libperl)​:
  Compile-time options​: HAS_TIMES MULTIPLICITY PERLIO_LAYERS
  PERL_DONT_CREATE_GVSV
  PERL_HASH_FUNC_ONE_AT_A_TIME_HARD
  PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP
  PERL_PRESERVE_IVUV PERL_SAWAMPERSAND
USE_64_BIT_ALL
  USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
  USE_LOCALE USE_LOCALE_COLLATE USE_LOCALE_CTYPE
  USE_LOCALE_NUMERIC USE_PERLIO USE_PERL_ATOF
  USE_REENTRANT_API
  Built under linux
  Compiled at Sep 2 2013 18​:11​:30
  %ENV​:
  PERL5LIB="/home/doug/perl5/lib/perl5"
  PERLBREW_BASHRC_VERSION="0.72"
  PERLBREW_HOME="/home/doug/.perlbrew"
  PERLBREW_ROOT="/home/doug/perl5/perlbrew"
  PERL_MB_OPT="--install_base "/home/doug/perl5""
  PERL_MM_OPT="INSTALL_BASE=/home/doug/perl5"
  PERL_STRICTURES_EXTRA=""
  @​INC​:
  /home/doug/perl5/lib/perl5/x86_64-linux-thread-multi
  /home/doug/perl5/lib/perl5
  /usr/local/lib64/perl5
  /usr/local/share/perl5
  /usr/lib64/perl5/vendor_perl
  /usr/share/perl5/vendor_perl
  /usr/lib64/perl5
  /usr/share/perl5
  .

@p6rt
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p6rt commented Oct 24, 2016

From doug@theschrags.net

use v6;

sub bogosort_concurrent ( *@​list ) {
  my $sorted = Channel.new;

  start until $sorted.closed {
  start {
  my @​guess = @​list.pick(*);

  $sorted.send( @​guess )
  if [!after] @​guess;
  }
  }

  return $sorted.receive;
# Using the LEAVE block prevents the error
# LEAVE { $sorted.close }
}

my @​test_data = < p e r l s i x >;

for ^4
{
  say bogosort_concurrent(@​test_data);
  say time - INIT { time }, ' seconds.';
}

@p6rt
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p6rt commented Oct 25, 2016

From doug@theschrags.net

Sorry, wrong system report. Here is the correct one (perl6 interpreter)​:

moar​::dcbrule=@​​:
moar​::ar=ar
moar​::mastdir=/usr/local/opt/rakudo-star-2016.10-RC0/share/nqp/lib/MAST
moar​::tomrule=$(AR) $(ARFLAGS) $@​ 3rdparty/libtommath/*.o
moar​::syslibs[2]=rt
moar​::shaobjects=3rdparty/sha1/sha1.o
moar​::ccshared=-fPIC
moar​::be=0
moar​::dynasmlua=./3rdparty/dynasm/dynasm.lua
moar​::ld=gcc
moar​::mtlib=3rdparty/tinymt/libtinymt.a
moar​::mtobjects=3rdparty/tinymt/tinymt64.o
moar​::noreturnspecifier=
moar​::perl=/usr/bin/perl5.18.1
moar​::shaclean=$(RM) 3rdparty/sha1/libsha1.a 3rdparty/sha1/*.o
moar​::static_inline=static __inline__
moar​::ccdebugflags=-g3
moar​::auxclean=@​​:
moar​::thirdpartylibs=3rdparty/dyncall/dyncall/libdyncall_s.a
3rdparty/dyncall/dyncallback/libdyncallback_s.a
3rdparty/dyncall/dynload/libdynload_s.a
3rdparty/libatomic_ops/src/libatomic_ops.a 3rdparty/tinymt/libtinymt.a
3rdparty/sha1/libsha1.a 3rdparty/libtommath/libtommath.a
3rdparty/libuv/libuv.a
moar​::config=--optimize --prefix=/usr/local/opt/rakudo-star-2016.10-RC0
--make-install
moar​::ccinc=-I
moar​::booltype=_Bool
moar​::ldout=-o
moar​::moarlib=libmoar.a
moar​::mtrule=$(AR) $(ARFLAGS) $@​ 3rdparty/tinymt/*.o
moar​::syslibs[0]=m
moar​::dcrule=cd 3rdparty/dyncall && ./configure && CC='$(CC)'
CFLAGS='$(CFLAGS)' $(MAKE) -f Makefile
moar​::dcbobjects=
moar​::cflags=-Wdeclaration-after-statement
-Werror=declaration-after-statement -O3 -DNDEBUG -D_REENTRANT
-D_FILE_OFFSET_BITS=64 -fPIC
moar​::laolib=3rdparty/libatomic_ops/src/libatomic_ops.a
moar​::libdir=/usr/local/opt/rakudo-star-2016.10-RC0/lib
moar​::nul=/dev/null
moar​::osvers=3.10.9
moar​::translate_newline_output=0
moar​::dlrule=@​​:
moar​::cat=cat
moar​::can_unaligned_int32=1
moar​::ldimp=
moar​::pkgconfig=/usr/bin/pkg-config
moar​::ccdef=-D
moar​::lib=lib%s.a
moar​::tomclean=$(RM) 3rdparty/libtommath/libtommath.a
3rdparty/libtommath/*.o
moar​::dlllocal=__attribute__ ((visibility ("hidden")))
moar​::dcbclean=$(RM) 3rdparty/dyncall/dyncallback/libdyncallback_s.a
moar​::noreturnattribute=__attribute__((noreturn))
moar​::ptr_size=8
moar​::dllimport=__attribute__ ((visibility ("default")))
moar​::ccout=-o
moar​::can_unaligned_num64=1
moar​::has_pthread_yield=1
moar​::ldrpath=-Wl,-rpath,"//usr/local/opt/rakudo-star-2016.10-RC0/lib"
-Wl,-rpath,"/usr/local/opt/rakudo-star-2016.10-RC0/share/perl6/site/lib"
moar​::ldusr=-l%s
moar​::mainflags=-DMVM_SHARED
moar​::name=moar
moar​::dll=lib%s.so
moar​::cincludes= -I3rdparty/libuv/include -I3rdparty/libuv/src
-I3rdparty/libatomic_ops/src -I3rdparty/libtommath -I3rdparty/dynasm
-I3rdparty/dyncall/dynload -I3rdparty/dyncall/dyncall
-I3rdparty/dyncall/dyncallback
moar​::uvrule=$(AR) $(ARFLAGS) $@​ $(UV_LINUX)
moar​::tomlib=3rdparty/libtommath/libtommath.a
moar​::syslibs[3]=dl
moar​::staticlib=
moar​::dlclean=$(RM) 3rdparty/dyncall/dynload/libdynload_s.a
moar​::make=make
moar​::ccinstflags=-pg
moar​::ldflags= -O3 -DNDEBUG
-Wl,-rpath,"//usr/local/opt/rakudo-star-2016.10-RC0/lib"
-Wl,-rpath,"/usr/local/opt/rakudo-star-2016.10-RC0/share/perl6/site/lib"
moar​::crossconf=
moar​::obj=.o
moar​::dlobjects=
moar​::defs[0]=_REENTRANT
moar​::cppout=>
moar​::ccoptiflags=-O3 -DNDEBUG
moar​::asmswitch=-S
moar​::ldoptiflags=-O3 -DNDEBUG
moar​::mkflags=
moar​::moar=libmoar.so
moar​::version=2016.10
moar​::dcclean=cd 3rdparty/dyncall && $(MAKE) -f Makefile clean
moar​::moarshared=
moar​::sharule=$(AR) $(ARFLAGS) $@​ 3rdparty/sha1/*.o
moar​::ccwarnflags=
moar​::jit=$(JIT_POSIX_X64)
moar​::moardll=libmoar.so
moar​::pkgconfig_works=1
moar​::asm=.s
moar​::mknoisy=ifneq ($(NOISY), 1)MSG = @​echoCMD = @​NOOUT = >
/dev/nullNOERR = 2> /dev/nullendif
moar​::dclib=3rdparty/dyncall/dyncall/libdyncall_s.a
moar​::ccdefflags=-D_REENTRANT -D_FILE_OFFSET_BITS=64
moar​::cc=gcc
moar​::exe=
moar​::lddir=-L
moar​::uvlib=3rdparty/libuv/libuv.a
moar​::dllib=3rdparty/dyncall/dynload/libdynload_s.a
moar​::shaincludedir=3rdparty/sha1
moar​::versionmajor=2016
moar​::cppswitch=-E
moar​::can_unaligned_int64=1
moar​::lua=./3rdparty/dynasm/minilua
moar​::dcobjects=
moar​::cancgoto=1
moar​::ldlibs=-lm -lpthread -lrt -ldl
moar​::mainlibs=-L. -lmoar
moar​::nativecall_backend=dyncall
moar​::objflags=-DMVM_BUILD_SHARED -fPIC
moar​::versionpatch=0
moar​::laoclean=cd 3rdparty/libatomic_ops/src && $(MAKE) distclean
moar​::versionminor=10
moar​::ccmiscflags=-Wdeclaration-after-statement
-Werror=declaration-after-statement
moar​::install= $(MKPATH) $(DESTDIR)$(PREFIX)/include/libuv $(CP)
3rdparty/libuv/include/*.h $(DESTDIR)$(PREFIX)/include/libuv $(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/armcc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/gcc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/hpc
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/ibmc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/icc
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/loadstore
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/msftc
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/sunc $(CP)
3rdparty/libatomic_ops/src/*.h $(DESTDIR)$(PREFIX)/include/libatomic_ops
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/armcc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/armcc
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/gcc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/gcc $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/hpc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/hpc $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/ibmc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/ibmc
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/icc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/icc $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/loadstore/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/loadstore
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/msftc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/msftc
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/sunc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/sunc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libtommath $(CP)
3rdparty/libtommath/*.h $(DESTDIR)$(PREFIX)/include/libtommath
$(MKPATH) $(DESTDIR)$(PREFIX)/include/dyncall $(CP)
3rdparty/dyncall/dynload/*.h $(DESTDIR)$(PREFIX)/include/dyncall $(CP)
3rdparty/dyncall/dyncall/*.h $(DESTDIR)$(PREFIX)/include/dyncall
$(CP) 3rdparty/dyncall/dyncallback/*.h $(DESTDIR)$(PREFIX)/include/dyncall
moar​::laoobjects=
moar​::mtclean=$(RM) 3rdparty/tinymt/libtinymt.a 3rdparty/tinymt/*.o
moar​::rm=rm -f
moar​::uvclean=$(RM) 3rdparty/libuv/libuv.a $(UV_LINUX)
moar​::sharedlib=
moar​::dllexport=__attribute__ ((visibility ("default")))
moar​::shalib=3rdparty/sha1/libsha1.a
moar​::arout=
moar​::lddebugflags=-g3
moar​::osname=linux
moar​::prefix=/usr/local/opt/rakudo-star-2016.10-RC0
moar​::uvobjects=$(UV_LINUX)
moar​::dcblib=3rdparty/dyncall/dyncallback/libdyncallback_s.a
moar​::bindir=/usr/local/opt/rakudo-star-2016.10-RC0/bin
moar​::asmout=-o
moar​::havebooltype=1
moar​::laorule=cd 3rdparty/libatomic_ops && CC='$(CC)' CFLAGS='$(CFLAGS)'
./configure && cd src && $(MAKE) && cd ..
moar​::os=linux
moar​::sh=/bin/sh
moar​::arflags=rcs
moar​::ldshared=-shared -fPIC
moar​::defs[1]=_FILE_OFFSET_BITS=64
moar​::impinst=
moar​::ldinstflags=-pg
moar​::ldmiscflags=
moar​::ldsys=-l%s
moar​::platform=$(PLATFORM_POSIX)
moar​::ccswitch=-c
moar​::formatattribute=__attribute__((format(X, Y, Z)))
moar​::tomobjects=3rdparty/libtommath/bn_error.o
3rdparty/libtommath/bn_fast_mp_invmod.o
3rdparty/libtommath/bn_fast_mp_montgomery_reduce.o
3rdparty/libtommath/bn_fast_s_mp_mul_digs.o
3rdparty/libtommath/bn_fast_s_mp_mul_high_digs.o
3rdparty/libtommath/bn_fast_s_mp_sqr.o 3rdparty/libtommath/bn_mp_2expt.o
3rdparty/libtommath/bn_mp_abs.o 3rdparty/libtommath/bn_mp_add.o
3rdparty/libtommath/bn_mp_add_d.o 3rdparty/libtommath/bn_mp_addmod.o
3rdparty/libtommath/bn_mp_and.o 3rdparty/libtommath/bn_mp_clamp.o
3rdparty/libtommath/bn_mp_clear.o 3rdparty/libtommath/bn_mp_clear_multi.o
3rdparty/libtommath/bn_mp_cmp.o 3rdparty/libtommath/bn_mp_cmp_d.o
3rdparty/libtommath/bn_mp_cmp_mag.o 3rdparty/libtommath/bn_mp_cnt_lsb.o
3rdparty/libtommath/bn_mp_copy.o 3rdparty/libtommath/bn_mp_count_bits.o
3rdparty/libtommath/bn_mp_div.o 3rdparty/libtommath/bn_mp_div_2.o
3rdparty/libtommath/bn_mp_div_2d.o 3rdparty/libtommath/bn_mp_div_3.o
3rdparty/libtommath/bn_mp_div_d.o
3rdparty/libtommath/bn_mp_dr_is_modulus.o
3rdparty/libtommath/bn_mp_dr_reduce.o 3rdparty/libtommath/bn_mp_dr_setup.o
3rdparty/libtommath/bn_mp_exch.o 3rdparty/libtommath/bn_mp_expt_d.o
3rdparty/libtommath/bn_mp_exptmod.o
3rdparty/libtommath/bn_mp_exptmod_fast.o
3rdparty/libtommath/bn_mp_exteuclid.o 3rdparty/libtommath/bn_mp_fread.o
3rdparty/libtommath/bn_mp_fwrite.o 3rdparty/libtommath/bn_mp_gcd.o
3rdparty/libtommath/bn_mp_get_int.o 3rdparty/libtommath/bn_mp_get_long.o
3rdparty/libtommath/bn_mp_grow.o 3rdparty/libtommath/bn_mp_init.o
3rdparty/libtommath/bn_mp_init_copy.o
3rdparty/libtommath/bn_mp_init_multi.o
3rdparty/libtommath/bn_mp_init_set.o
3rdparty/libtommath/bn_mp_init_set_int.o
3rdparty/libtommath/bn_mp_init_size.o 3rdparty/libtommath/bn_mp_invmod.o
3rdparty/libtommath/bn_mp_invmod_slow.o
3rdparty/libtommath/bn_mp_is_square.o 3rdparty/libtommath/bn_mp_jacobi.o
3rdparty/libtommath/bn_mp_karatsuba_mul.o
3rdparty/libtommath/bn_mp_karatsuba_sqr.o 3rdparty/libtommath/bn_mp_lcm.o
3rdparty/libtommath/bn_mp_lshd.o 3rdparty/libtommath/bn_mp_mod.o
3rdparty/libtommath/bn_mp_mod_2d.o 3rdparty/libtommath/bn_mp_mod_d.o
3rdparty/libtommath/bn_mp_montgomery_calc_normalization.o
3rdparty/libtommath/bn_mp_montgomery_reduce.o
3rdparty/libtommath/bn_mp_montgomery_setup.o
3rdparty/libtommath/bn_mp_mul.o 3rdparty/libtommath/bn_mp_mul_2.o
3rdparty/libtommath/bn_mp_mul_2d.o 3rdparty/libtommath/bn_mp_mul_d.o
3rdparty/libtommath/bn_mp_mulmod.o 3rdparty/libtommath/bn_mp_n_root.o
3rdparty/libtommath/bn_mp_neg.o 3rdparty/libtommath/bn_mp_or.o
3rdparty/libtommath/bn_mp_prime_fermat.o
3rdparty/libtommath/bn_mp_prime_is_divisible.o
3rdparty/libtommath/bn_mp_prime_is_prime.o
3rdparty/libtommath/bn_mp_prime_miller_rabin.o
3rdparty/libtommath/bn_mp_prime_next_prime.o
3rdparty/libtommath/bn_mp_prime_rabin_miller_trials.o
3rdparty/libtommath/bn_mp_prime_random_ex.o
3rdparty/libtommath/bn_mp_radix_size.o
3rdparty/libtommath/bn_mp_radix_smap.o 3rdparty/libtommath/bn_mp_rand.o
3rdparty/libtommath/bn_mp_read_radix.o
3rdparty/libtommath/bn_mp_read_signed_bin.o
3rdparty/libtommath/bn_mp_read_unsigned_bin.o
3rdparty/libtommath/bn_mp_reduce.o 3rdparty/libtommath/bn_mp_reduce_2k.o
3rdparty/libtommath/bn_mp_reduce_2k_l.o
3rdparty/libtommath/bn_mp_reduce_2k_setup.o
3rdparty/libtommath/bn_mp_reduce_2k_setup_l.o
3rdparty/libtommath/bn_mp_reduce_is_2k.o
3rdparty/libtommath/bn_mp_reduce_is_2k_l.o
3rdparty/libtommath/bn_mp_reduce_setup.o 3rdparty/libtommath/bn_mp_rshd.o
3rdparty/libtommath/bn_mp_set.o 3rdparty/libtommath/bn_mp_set_int.o
3rdparty/libtommath/bn_mp_set_long.o 3rdparty/libtommath/bn_mp_shrink.o
3rdparty/libtommath/bn_mp_signed_bin_size.o
3rdparty/libtommath/bn_mp_sqr.o 3rdparty/libtommath/bn_mp_sqrmod.o
3rdparty/libtommath/bn_mp_sqrt.o 3rdparty/libtommath/bn_mp_sub.o
3rdparty/libtommath/bn_mp_sub_d.o 3rdparty/libtommath/bn_mp_submod.o
3rdparty/libtommath/bn_mp_to_signed_bin.o
3rdparty/libtommath/bn_mp_to_signed_bin_n.o
3rdparty/libtommath/bn_mp_to_unsigned_bin.o
3rdparty/libtommath/bn_mp_to_unsigned_bin_n.o
3rdparty/libtommath/bn_mp_toom_mul.o 3rdparty/libtommath/bn_mp_toom_sqr.o
3rdparty/libtommath/bn_mp_toradix.o 3rdparty/libtommath/bn_mp_toradix_n.o
3rdparty/libtommath/bn_mp_unsigned_bin_size.o
3rdparty/libtommath/bn_mp_xor.o 3rdparty/libtommath/bn_mp_zero.o
3rdparty/libtommath/bn_prime_tab.o 3rdparty/libtommath/bn_reverse.o
3rdparty/libtommath/bn_s_mp_add.o 3rdparty/libtommath/bn_s_mp_exptmod.o
3rdparty/libtommath/bn_s_mp_mul_digs.o
3rdparty/libtommath/bn_s_mp_mul_high_digs.o
3rdparty/libtommath/bn_s_mp_sqr.o 3rdparty/libtommath/bn_s_mp_sub.o
3rdparty/libtommath/bncore.o
moar​::syslibs[1]=pthread
perl6​::language_version=6.c
perl6​::codename=
perl6​::release-number=
perl6​::build-date=2016-10-21T02​:29​:17Z
perl6​::version=2016.10
perl6​::implementation=Rakudo

Doug Schrag <><
Houston, TX
Traverse City, MI

@p6rt
Copy link
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p6rt commented Oct 27, 2016

From doug@theschrags.net

Sorry, wrong system report previously attached.

moar​::dcbrule=@​​:
moar​::ar=ar
moar​::mastdir=/usr/local/opt/rakudo-star-2016.10-RC0/share/nqp/lib/MAST
moar​::tomrule=$(AR) $(ARFLAGS) $@​ 3rdparty/libtommath/*.o
moar​::syslibs[2]=rt
moar​::shaobjects=3rdparty/sha1/sha1.o
moar​::ccshared=-fPIC
moar​::be=0
moar​::dynasmlua=./3rdparty/dynasm/dynasm.lua
moar​::ld=gcc
moar​::mtlib=3rdparty/tinymt/libtinymt.a
moar​::mtobjects=3rdparty/tinymt/tinymt64.o
moar​::noreturnspecifier=
moar​::perl=/usr/bin/perl5.18.1
moar​::shaclean=$(RM) 3rdparty/sha1/libsha1.a 3rdparty/sha1/*.o
moar​::static_inline=static __inline__
moar​::ccdebugflags=-g3
moar​::auxclean=@​​:
moar​::thirdpartylibs=3rdparty/dyncall/dyncall/libdyncall_s.a
3rdparty/dyncall/dyncallback/libdyncallback_s.a
3rdparty/dyncall/dynload/libdynload_s.a
3rdparty/libatomic_ops/src/libatomic_ops.a 3rdparty/tinymt/libtinymt.a
3rdparty/sha1/libsha1.a 3rdparty/libtommath/libtommath.a
3rdparty/libuv/libuv.a
moar​::config=--optimize --prefix=/usr/local/opt/rakudo-star-2016.10-RC0
--make-install
moar​::ccinc=-I
moar​::booltype=_Bool
moar​::ldout=-o
moar​::moarlib=libmoar.a
moar​::mtrule=$(AR) $(ARFLAGS) $@​ 3rdparty/tinymt/*.o
moar​::syslibs[0]=m
moar​::dcrule=cd 3rdparty/dyncall && ./configure && CC='$(CC)'
CFLAGS='$(CFLAGS)' $(MAKE) -f Makefile
moar​::dcbobjects=
moar​::cflags=-Wdeclaration-after-statement
-Werror=declaration-after-statement -O3 -DNDEBUG -D_REENTRANT
-D_FILE_OFFSET_BITS=64 -fPIC
moar​::laolib=3rdparty/libatomic_ops/src/libatomic_ops.a
moar​::libdir=/usr/local/opt/rakudo-star-2016.10-RC0/lib
moar​::nul=/dev/null
moar​::osvers=3.10.9
moar​::translate_newline_output=0
moar​::dlrule=@​​:
moar​::cat=cat
moar​::can_unaligned_int32=1
moar​::ldimp=
moar​::pkgconfig=/usr/bin/pkg-config
moar​::ccdef=-D
moar​::lib=lib%s.a
moar​::tomclean=$(RM) 3rdparty/libtommath/libtommath.a
3rdparty/libtommath/*.o
moar​::dlllocal=__attribute__ ((visibility ("hidden")))
moar​::dcbclean=$(RM) 3rdparty/dyncall/dyncallback/libdyncallback_s.a
moar​::noreturnattribute=__attribute__((noreturn))
moar​::ptr_size=8
moar​::dllimport=__attribute__ ((visibility ("default")))
moar​::ccout=-o
moar​::can_unaligned_num64=1
moar​::has_pthread_yield=1
moar​::ldrpath=-Wl,-rpath,"//usr/local/opt/rakudo-star-2016.10-RC0/lib"
-Wl,-rpath,"/usr/local/opt/rakudo-star-2016.10-RC0/share/perl6/site/lib"
moar​::ldusr=-l%s
moar​::mainflags=-DMVM_SHARED
moar​::name=moar
moar​::dll=lib%s.so
moar​::cincludes= -I3rdparty/libuv/include -I3rdparty/libuv/src
-I3rdparty/libatomic_ops/src -I3rdparty/libtommath -I3rdparty/dynasm
-I3rdparty/dyncall/dynload -I3rdparty/dyncall/dyncall
-I3rdparty/dyncall/dyncallback
moar​::uvrule=$(AR) $(ARFLAGS) $@​ $(UV_LINUX)
moar​::tomlib=3rdparty/libtommath/libtommath.a
moar​::syslibs[3]=dl
moar​::staticlib=
moar​::dlclean=$(RM) 3rdparty/dyncall/dynload/libdynload_s.a
moar​::make=make
moar​::ccinstflags=-pg
moar​::ldflags= -O3 -DNDEBUG
-Wl,-rpath,"//usr/local/opt/rakudo-star-2016.10-RC0/lib"
-Wl,-rpath,"/usr/local/opt/rakudo-star-2016.10-RC0/share/perl6/site/lib"
moar​::crossconf=
moar​::obj=.o
moar​::dlobjects=
moar​::defs[0]=_REENTRANT
moar​::cppout=>
moar​::ccoptiflags=-O3 -DNDEBUG
moar​::asmswitch=-S
moar​::ldoptiflags=-O3 -DNDEBUG
moar​::mkflags=
moar​::moar=libmoar.so
moar​::version=2016.10
moar​::dcclean=cd 3rdparty/dyncall && $(MAKE) -f Makefile clean
moar​::moarshared=
moar​::sharule=$(AR) $(ARFLAGS) $@​ 3rdparty/sha1/*.o
moar​::ccwarnflags=
moar​::jit=$(JIT_POSIX_X64)
moar​::moardll=libmoar.so
moar​::pkgconfig_works=1
moar​::asm=.s
moar​::mknoisy=ifneq ($(NOISY), 1)MSG = @​echoCMD = @​NOOUT = >
/dev/nullNOERR = 2> /dev/nullendif
moar​::dclib=3rdparty/dyncall/dyncall/libdyncall_s.a
moar​::ccdefflags=-D_REENTRANT -D_FILE_OFFSET_BITS=64
moar​::cc=gcc
moar​::exe=
moar​::lddir=-L
moar​::uvlib=3rdparty/libuv/libuv.a
moar​::dllib=3rdparty/dyncall/dynload/libdynload_s.a
moar​::shaincludedir=3rdparty/sha1
moar​::versionmajor=2016
moar​::cppswitch=-E
moar​::can_unaligned_int64=1
moar​::lua=./3rdparty/dynasm/minilua
moar​::dcobjects=
moar​::cancgoto=1
moar​::ldlibs=-lm -lpthread -lrt -ldl
moar​::mainlibs=-L. -lmoar
moar​::nativecall_backend=dyncall
moar​::objflags=-DMVM_BUILD_SHARED -fPIC
moar​::versionpatch=0
moar​::laoclean=cd 3rdparty/libatomic_ops/src && $(MAKE) distclean
moar​::versionminor=10
moar​::ccmiscflags=-Wdeclaration-after-statement
-Werror=declaration-after-statement
moar​::install= $(MKPATH) $(DESTDIR)$(PREFIX)/include/libuv $(CP)
3rdparty/libuv/include/*.h $(DESTDIR)$(PREFIX)/include/libuv $(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/armcc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/gcc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/hpc
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/ibmc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/icc
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/loadstore
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/msftc
$(MKPATH)
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/sunc $(CP)
3rdparty/libatomic_ops/src/*.h $(DESTDIR)$(PREFIX)/include/libatomic_ops
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/armcc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/armcc
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/gcc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/gcc $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/hpc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/hpc $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/ibmc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/ibmc
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/icc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/icc $(CP)
3rdparty/libatomic_ops/src/atomic_ops/sysdeps/loadstore/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/loadstore
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/msftc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/msftc
$(CP) 3rdparty/libatomic_ops/src/atomic_ops/sysdeps/sunc/*.h
$(DESTDIR)$(PREFIX)/include/libatomic_ops/atomic_ops/sysdeps/sunc
$(MKPATH) $(DESTDIR)$(PREFIX)/include/libtommath $(CP)
3rdparty/libtommath/*.h $(DESTDIR)$(PREFIX)/include/libtommath
$(MKPATH) $(DESTDIR)$(PREFIX)/include/dyncall $(CP)
3rdparty/dyncall/dynload/*.h $(DESTDIR)$(PREFIX)/include/dyncall $(CP)
3rdparty/dyncall/dyncall/*.h $(DESTDIR)$(PREFIX)/include/dyncall
$(CP) 3rdparty/dyncall/dyncallback/*.h $(DESTDIR)$(PREFIX)/include/dyncall
moar​::laoobjects=
moar​::mtclean=$(RM) 3rdparty/tinymt/libtinymt.a 3rdparty/tinymt/*.o
moar​::rm=rm -f
moar​::uvclean=$(RM) 3rdparty/libuv/libuv.a $(UV_LINUX)
moar​::sharedlib=
moar​::dllexport=__attribute__ ((visibility ("default")))
moar​::shalib=3rdparty/sha1/libsha1.a
moar​::arout=
moar​::lddebugflags=-g3
moar​::osname=linux
moar​::prefix=/usr/local/opt/rakudo-star-2016.10-RC0
moar​::uvobjects=$(UV_LINUX)
moar​::dcblib=3rdparty/dyncall/dyncallback/libdyncallback_s.a
moar​::bindir=/usr/local/opt/rakudo-star-2016.10-RC0/bin
moar​::asmout=-o
moar​::havebooltype=1
moar​::laorule=cd 3rdparty/libatomic_ops && CC='$(CC)' CFLAGS='$(CFLAGS)'
./configure && cd src && $(MAKE) && cd ..
moar​::os=linux
moar​::sh=/bin/sh
moar​::arflags=rcs
moar​::ldshared=-shared -fPIC
moar​::defs[1]=_FILE_OFFSET_BITS=64
moar​::impinst=
moar​::ldinstflags=-pg
moar​::ldmiscflags=
moar​::ldsys=-l%s
moar​::platform=$(PLATFORM_POSIX)
moar​::ccswitch=-c
moar​::formatattribute=__attribute__((format(X, Y, Z)))
moar​::tomobjects=3rdparty/libtommath/bn_error.o
3rdparty/libtommath/bn_fast_mp_invmod.o
3rdparty/libtommath/bn_fast_mp_montgomery_reduce.o
3rdparty/libtommath/bn_fast_s_mp_mul_digs.o
3rdparty/libtommath/bn_fast_s_mp_mul_high_digs.o
3rdparty/libtommath/bn_fast_s_mp_sqr.o 3rdparty/libtommath/bn_mp_2expt.o
3rdparty/libtommath/bn_mp_abs.o 3rdparty/libtommath/bn_mp_add.o
3rdparty/libtommath/bn_mp_add_d.o 3rdparty/libtommath/bn_mp_addmod.o
3rdparty/libtommath/bn_mp_and.o 3rdparty/libtommath/bn_mp_clamp.o
3rdparty/libtommath/bn_mp_clear.o 3rdparty/libtommath/bn_mp_clear_multi.o
3rdparty/libtommath/bn_mp_cmp.o 3rdparty/libtommath/bn_mp_cmp_d.o
3rdparty/libtommath/bn_mp_cmp_mag.o 3rdparty/libtommath/bn_mp_cnt_lsb.o
3rdparty/libtommath/bn_mp_copy.o 3rdparty/libtommath/bn_mp_count_bits.o
3rdparty/libtommath/bn_mp_div.o 3rdparty/libtommath/bn_mp_div_2.o
3rdparty/libtommath/bn_mp_div_2d.o 3rdparty/libtommath/bn_mp_div_3.o
3rdparty/libtommath/bn_mp_div_d.o
3rdparty/libtommath/bn_mp_dr_is_modulus.o
3rdparty/libtommath/bn_mp_dr_reduce.o 3rdparty/libtommath/bn_mp_dr_setup.o
3rdparty/libtommath/bn_mp_exch.o 3rdparty/libtommath/bn_mp_expt_d.o
3rdparty/libtommath/bn_mp_exptmod.o
3rdparty/libtommath/bn_mp_exptmod_fast.o
3rdparty/libtommath/bn_mp_exteuclid.o 3rdparty/libtommath/bn_mp_fread.o
3rdparty/libtommath/bn_mp_fwrite.o 3rdparty/libtommath/bn_mp_gcd.o
3rdparty/libtommath/bn_mp_get_int.o 3rdparty/libtommath/bn_mp_get_long.o
3rdparty/libtommath/bn_mp_grow.o 3rdparty/libtommath/bn_mp_init.o
3rdparty/libtommath/bn_mp_init_copy.o
3rdparty/libtommath/bn_mp_init_multi.o
3rdparty/libtommath/bn_mp_init_set.o
3rdparty/libtommath/bn_mp_init_set_int.o
3rdparty/libtommath/bn_mp_init_size.o 3rdparty/libtommath/bn_mp_invmod.o
3rdparty/libtommath/bn_mp_invmod_slow.o
3rdparty/libtommath/bn_mp_is_square.o 3rdparty/libtommath/bn_mp_jacobi.o
3rdparty/libtommath/bn_mp_karatsuba_mul.o
3rdparty/libtommath/bn_mp_karatsuba_sqr.o 3rdparty/libtommath/bn_mp_lcm.o
3rdparty/libtommath/bn_mp_lshd.o 3rdparty/libtommath/bn_mp_mod.o
3rdparty/libtommath/bn_mp_mod_2d.o 3rdparty/libtommath/bn_mp_mod_d.o
3rdparty/libtommath/bn_mp_montgomery_calc_normalization.o
3rdparty/libtommath/bn_mp_montgomery_reduce.o
3rdparty/libtommath/bn_mp_montgomery_setup.o
3rdparty/libtommath/bn_mp_mul.o 3rdparty/libtommath/bn_mp_mul_2.o
3rdparty/libtommath/bn_mp_mul_2d.o 3rdparty/libtommath/bn_mp_mul_d.o
3rdparty/libtommath/bn_mp_mulmod.o 3rdparty/libtommath/bn_mp_n_root.o
3rdparty/libtommath/bn_mp_neg.o 3rdparty/libtommath/bn_mp_or.o
3rdparty/libtommath/bn_mp_prime_fermat.o
3rdparty/libtommath/bn_mp_prime_is_divisible.o
3rdparty/libtommath/bn_mp_prime_is_prime.o
3rdparty/libtommath/bn_mp_prime_miller_rabin.o
3rdparty/libtommath/bn_mp_prime_next_prime.o
3rdparty/libtommath/bn_mp_prime_rabin_miller_trials.o
3rdparty/libtommath/bn_mp_prime_random_ex.o
3rdparty/libtommath/bn_mp_radix_size.o
3rdparty/libtommath/bn_mp_radix_smap.o 3rdparty/libtommath/bn_mp_rand.o
3rdparty/libtommath/bn_mp_read_radix.o
3rdparty/libtommath/bn_mp_read_signed_bin.o
3rdparty/libtommath/bn_mp_read_unsigned_bin.o
3rdparty/libtommath/bn_mp_reduce.o 3rdparty/libtommath/bn_mp_reduce_2k.o
3rdparty/libtommath/bn_mp_reduce_2k_l.o
3rdparty/libtommath/bn_mp_reduce_2k_setup.o
3rdparty/libtommath/bn_mp_reduce_2k_setup_l.o
3rdparty/libtommath/bn_mp_reduce_is_2k.o
3rdparty/libtommath/bn_mp_reduce_is_2k_l.o
3rdparty/libtommath/bn_mp_reduce_setup.o 3rdparty/libtommath/bn_mp_rshd.o
3rdparty/libtommath/bn_mp_set.o 3rdparty/libtommath/bn_mp_set_int.o
3rdparty/libtommath/bn_mp_set_long.o 3rdparty/libtommath/bn_mp_shrink.o
3rdparty/libtommath/bn_mp_signed_bin_size.o
3rdparty/libtommath/bn_mp_sqr.o 3rdparty/libtommath/bn_mp_sqrmod.o
3rdparty/libtommath/bn_mp_sqrt.o 3rdparty/libtommath/bn_mp_sub.o
3rdparty/libtommath/bn_mp_sub_d.o 3rdparty/libtommath/bn_mp_submod.o
3rdparty/libtommath/bn_mp_to_signed_bin.o
3rdparty/libtommath/bn_mp_to_signed_bin_n.o
3rdparty/libtommath/bn_mp_to_unsigned_bin.o
3rdparty/libtommath/bn_mp_to_unsigned_bin_n.o
3rdparty/libtommath/bn_mp_toom_mul.o 3rdparty/libtommath/bn_mp_toom_sqr.o
3rdparty/libtommath/bn_mp_toradix.o 3rdparty/libtommath/bn_mp_toradix_n.o
3rdparty/libtommath/bn_mp_unsigned_bin_size.o
3rdparty/libtommath/bn_mp_xor.o 3rdparty/libtommath/bn_mp_zero.o
3rdparty/libtommath/bn_prime_tab.o 3rdparty/libtommath/bn_reverse.o
3rdparty/libtommath/bn_s_mp_add.o 3rdparty/libtommath/bn_s_mp_exptmod.o
3rdparty/libtommath/bn_s_mp_mul_digs.o
3rdparty/libtommath/bn_s_mp_mul_high_digs.o
3rdparty/libtommath/bn_s_mp_sqr.o 3rdparty/libtommath/bn_s_mp_sub.o
3rdparty/libtommath/bncore.o
moar​::syslibs[1]=pthread
perl6​::language_version=6.c
perl6​::codename=
perl6​::release-number=
perl6​::build-date=2016-10-21T02​:29​:17Z
perl6​::version=2016.10
perl6​::implementation=Rakudo

Doug Schrag <><
Houston, TX
Traverse City, MI

@p6rt
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p6rt commented Nov 1, 2016

From @jnthn

On Sun Oct 23 18​:01​:55 2016, doug@​theschrags.net wrote​:

This probably is an issue with moarvm.

It was indeed.

When trying to benchmark the concurrent and non-concurrent versions of
Damien Conway's 'bogosort' algorithm, I ran into numerous problems with
Rakudo Star 2016.07 - depending on the MAX_RAKUDO_THREADS setting, the
process might succeed, or it might slowly eat up all of memory, and if
more than a few threads were used only some would actually process
anything (accumulate CPU time). rakudo-star-2016.10-RC0 looks like it
solved the deadlock problem, so that all threads are actually working.

However, now this version of the program crashes after the first thread
completes with​:
Internal error​: zeroed target thread ID in work pass

or occasionally​:
Internal error​: invalid thread ID 8770096 in GC work pass

Test runs​:

doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
1 seconds.
Internal error​: invalid thread ID 8770096 in GC work pass
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
4 seconds.
Internal error​: zeroed target thread ID in work pass
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
24 seconds.
Internal error​: zeroed target thread ID in work pass
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
6 seconds.
Internal error​: zeroed target thread ID in work pass

I also found that the problem is likely related to a channel not being
explicitly closed, so I was able to get normal test runs as follows​:

[ With a LEAVE block to close the channels ]

doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
4 seconds.
[e i l p r s x]
29 seconds.
[e i l p r s x]
57 seconds.
[e i l p r s x]
58 seconds.
doug@​ender​:~/study/Perl6/benchmarks$ RAKUDO_MAX_THREADS=2 perl6
bench_bogosort_simple.pl6
[e i l p r s x]
4 seconds.
[e i l p r s x]
10 seconds.
[e i l p r s x]
20 seconds.
[e i l p r s x]
31 seconds.

I'm figuring that failing to close the channels is bad practice to start,
but we don't really want to crash the VM with an obscure error message.
Also, I saw a bug report earlier this year where this message was
produced, but closed because of uncertainty in reproducing it. This test,
however fails quite repeatably, at least on my system (linux).

The channel really does want closing, otherwise you end up with a bunch of threads sat in a hot loop eating CPU (and each run sets off another thread doing exactly that, which is why the thing gets slower every run with the missing Channel.close). Of course, a VM crash is the wrong response; I've now hunted that down and committed a fix.

It turns out the bug wasn't actually anything to do with closing the channel per se; it's just that missing the `LEAVE` out resulted in a lot more load and GC runs. The problem almost certainly could have happened with the `LEAVE` there; it was just a lot less likely.

I've added this example as a stresstest, to catch any regressions.

Thanks!

/jnthn

@p6rt
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p6rt commented Nov 1, 2016

The RT System itself - Status changed from 'new' to 'open'

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p6rt commented Nov 1, 2016

@jnthn - Status changed from 'open' to 'resolved'

@p6rt p6rt closed this as completed Nov 1, 2016
@p6rt p6rt added the Bug label Jan 5, 2020
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