diff options
Diffstat (limited to 'usr/src/tools/scripts/find_elf.pl')
| -rw-r--r-- | usr/src/tools/scripts/find_elf.pl | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/usr/src/tools/scripts/find_elf.pl b/usr/src/tools/scripts/find_elf.pl index 58fc5f7059..96d5b24c7a 100644 --- a/usr/src/tools/scripts/find_elf.pl +++ b/usr/src/tools/scripts/find_elf.pl @@ -69,8 +69,20 @@ BEGIN { } } +# +# We need to clamp the maximum number of threads that we use. Because +# this program is mostly an exercise in fork1, more threads doesn't +# actually help us after a certain point as we just spend more and more +# time trying to stop all of our LWPs than making forward progress. +# We've seen experimentally on both 2P systems with 128 cores and 1P +# systems with 16 cores that around 8 threads is a relative sweet spot. +# chomp (my $NPROCESSORS_ONLN = `getconf NPROCESSORS_ONLN 2>/dev/null` || 1); my $max_threads = $ENV{DMAKE_MAX_JOBS} || $NPROCESSORS_ONLN; +if ($max_threads > 8) { + $max_threads = 8; +} + my $tq; if ($Config{useithreads}) { |