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From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH 8/9] v2writable: nproc: use sysconf() on Linux and FreeBSD
Date: Wed, 27 Jan 2021 03:42:29 -0600	[thread overview]
Message-ID: <20210127094230.31174-9-e@80x24.org> (raw)
In-Reply-To: <20210127094230.31174-1-e@80x24.org>

No need to fork a process on platforms I use daily, at least.
---
 lib/PublicInbox/V2Writable.pm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 7f9342b0..35b7fe30 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -21,6 +21,7 @@ use PublicInbox::Search;
 use PublicInbox::SearchIdx qw(log2stack is_ancestor check_size is_bad_blob);
 use IO::Handle; # ->autoflush
 use File::Temp ();
+use POSIX ();
 
 my $OID = qr/[a-f0-9]{40,}/;
 # an estimate of the post-packed size to the raw uncompressed size
@@ -35,6 +36,11 @@ our $PACKING_FACTOR = 0.4;
 our $NPROC_MAX_DEFAULT = 4;
 
 sub detect_nproc () {
+	# _SC_NPROCESSORS_ONLN = 84 on both Linux glibc and musl
+	return POSIX::sysconf(84) if $^O eq 'linux';
+	return POSIX::sysconf(58) if $^O eq 'freebsd';
+	# TODO: more OSes
+
 	# getconf(1) is POSIX, but *NPROCESSORS* vars are not
 	for (qw(_NPROCESSORS_ONLN NPROCESSORS_ONLN)) {
 		`getconf $_ 2>/dev/null` =~ /^(\d+)$/ and return $1;

  parent reply	other threads:[~2021-01-27  9:42 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-27  9:42 [PATCH 0/9] lei completion, some small updates Eric Wong
2021-01-27  9:42 ` [PATCH 1/9] eml: favor index() over regexp match Eric Wong
2021-01-27  9:42 ` [PATCH 2/9] lei: drop "git" command forwarding Eric Wong
2021-01-27  9:42 ` [PATCH 3/9] lei: fix comment regarding client payload Eric Wong
2021-01-27  9:42 ` [PATCH 4/9] lei: set PWD correctly for path expansion Eric Wong
2021-01-27  9:42 ` [PATCH 5/9] gcf2: rely on Perl 5.10 to avoid needless ++ Eric Wong
2021-01-27  9:42 ` [PATCH 6/9] lei: complete option switch args Eric Wong
2021-01-27  9:42 ` [PATCH 7/9] lei_overview: clear redundant ovv_buf definition Eric Wong
2021-01-27  9:42 ` Eric Wong [this message]
2021-01-27  9:42 ` [PATCH 9/9] lei: dclose: fix typo Eric Wong

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