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parallel: GNU/Linux cpu detection by reading lscpu.

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Ole Tange 2020-09-23 10:03:54 +02:00
parent 3fc2bf228f
commit 7398301e68
1 changed files with 58 additions and 19 deletions
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77
src/parallel
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@ -7416,24 +7416,8 @@ sub sct_gnu_linux($) {
$cpu->{'threads'} = $thread; $cpu->{'threads'} = $thread;
} }
local $/ = "\n"; # If delimiter is set, then $/ will be wrong sub read_cpuinfo(@) {
my @cpuinfo; my @cpuinfo = @_;
if($ENV{'PARALLEL_CPUINFO'}) {
# Use CPUINFO from environment - used for testing only
@cpuinfo = split/(?<=\n)/,$ENV{'PARALLEL_CPUINFO'};
} elsif(-r "$ENV{'PARALLEL_CPUPREFIX'}/cpu0/topology/thread_siblings") {
# Use CPUPREFIX from environment - used for testing only
read_topology($ENV{'PARALLEL_CPUPREFIX'});
} elsif($cpu->{'sockets'} and $cpu->{'cores'} and
$cpu->{'threads'}) {
# Skip /proc/cpuinfo - already set
} elsif(-r "/sys/devices/system/cpu/cpu0/topology/thread_siblings") {
read_topology("/sys/devices/system/cpu");
} elsif(open(my $in_fh, "<", "/proc/cpuinfo")) {
# Read /proc/cpuinfo
@cpuinfo = <$in_fh>;
}
if(@cpuinfo) {
$cpu->{'sockets'} = 0; $cpu->{'sockets'} = 0;
$cpu->{'cores'} = 0; $cpu->{'cores'} = 0;
$cpu->{'threads'} = 0; $cpu->{'threads'} = 0;
@ -7455,7 +7439,62 @@ sub sct_gnu_linux($) {
# processor : 2 # processor : 2
/^processor.*[:]\s*\d/i and $cpu->{'threads'}++; /^processor.*[:]\s*\d/i and $cpu->{'threads'}++;
} }
$cpu->{'cores'} ||= $cpu->{'threads'} || $cpu->{'sockets'}; $cpu->{'cores'} ||= $cpu->{'threads'};
$cpu->{'cpus'} ||= $cpu->{'threads'};
$cpu->{'sockets'} ||= 1;
}
sub read_lscpu(@) {
my @lscpu = @_;
my $threads_per_core;
my $cores_per_socket;
for(@lscpu) {
/^CPU.s.:\s*(\d+)/ and $cpu->{'threads'} = $1;
/^Thread.s. per core:\s*(\d+)/ and $threads_per_core = $1;
/^Core.s. per socket:\s*(\d+)/ and $cores_per_socket = $1;
/^(CPU )?Socket.s.:\s*(\d+)/i and $cpu->{'sockets'} = $2;
}
if($threads_per_core and $cpu->{'threads'}) {
$cpu->{'cores'} = $cpu->{'threads'} / $threads_per_core;
}
$cpu->{'cpus'} ||= $cpu->{'threads'};
}
local $/ = "\n"; # If delimiter is set, then $/ will be wrong
my @cpuinfo;
my @lscpu;
if($ENV{'PARALLEL_CPUINFO'}) {
# Use CPUINFO from environment - used for testing only
read_cpuinfo(split/(?<=\n)/,$ENV{'PARALLEL_CPUINFO'});
} elsif($ENV{'PARALLEL_LSCPU'}) {
# Use LSCPU from environment - used for testing only
read_lscpu(split/(?<=\n)/,$ENV{'PARALLEL_LSCPU'});
} elsif(-r "$ENV{'PARALLEL_CPUPREFIX'}/cpu0/topology/thread_siblings") {
# Use CPUPREFIX from environment - used for testing only
read_topology($ENV{'PARALLEL_CPUPREFIX'});
} elsif($cpu->{'sockets'} and $cpu->{'cores'} and $cpu->{'threads'}) {
# Skip /proc/cpuinfo - already set
} else {
# Not debugging: Look at this computer
if(!($cpu->{'sockets'} and $cpu->{'cores'} and $cpu->{'threads'})
and
open(my $in_fh, "-|", "lscpu")) {
# Parse output from lscpu
read_lscpu(<$in_fh>);
close $in_fh;
}
if(!($cpu->{'sockets'} and $cpu->{'cores'} and $cpu->{'threads'})
and
-r "/sys/devices/system/cpu/cpu0/topology/thread_siblings") {
read_topology("/sys/devices/system/cpu");
}
if(!($cpu->{'sockets'} and $cpu->{'cores'} and $cpu->{'threads'})
and
open(my $in_fh, "<", "/proc/cpuinfo")) {
# Read /proc/cpuinfo
read_cpuinfo(<$in_fh>);
close $in_fh;
}
} }
if(-e "/proc/self/status" and not $ENV{'PARALLEL_CPUINFO'}) { if(-e "/proc/self/status" and not $ENV{'PARALLEL_CPUINFO'}) {
# if 'taskset' is used to limit number of threads # if 'taskset' is used to limit number of threads