Ok, I've read the manpages on netstat and it gives a good description of the state values such as CLOSE_WAIT, ESTABLISHED, SYN_RECEIVED, etc..
Can someone give me real world situations where you would get these states. LIke for example if I got SYN_RECEIVED what possible situations would be the... (1 Reply)
One of my servers started getting heavily loaded a few weeks ago for a few hours, so I did some studying and wrote a script to use netstat to get the IP addresses connected and the count. I put a new chain in iptables and if an IP is using more than 40 connections, it gets added to that chain which... (3 Replies)
Hi Everybody,
As I am new to Sun Clusters, Please help me what is "online but not monitored" state of resources and "online - service is online" in status message. Thank you. (1 Reply)
One node in my cluster is using ondemand governor which is specified in the directory
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ..
Scaling_governor allows us to choose the governor of our choice .
But this sub-directory is absent in the other node of the cluster . How do I change... (0 Replies)
I am trying to write my own Unix compliant (SUSv4) OS - Just a hobby OS, nothing serious. While going through the standard, I couldn't find any explicit information on process states. What I could find was (excluding the real-time considerations)-
From this it can be inferred that the... (2 Replies)
Hi guys,
Can you help me please to find an appropriate course of UNIX in the United States.
Also, can you provide me some information about the schools or institutes that offer it in the U.S.
Thanks, (0 Replies)
turbostat reports C-states of all CPU cores, and includes entries for each hyper-threaded core as well. Often enough the two logical cores on a single physical core will list different C state percentages. Does that make any sense?
Is this reporting the c-states of the few duplicated parts... (8 Replies)
I am using HP-UX,KSH
$ jobs -l
+ 19377 Running nohup ksh cat_Duplicate_Records_Removal.ksh </dev/null >/dev/null 2>&1 &
$ ps -p 19377 -fl
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME COMD
401 S catmgr 19377 19491 ... (1 Reply)
Discussion started by: TomG
1 Replies
LEARN ABOUT DEBIAN
devel::refcount
Devel::Refcount(3pm) User Contributed Perl Documentation Devel::Refcount(3pm)NAME
"Devel::Refcount" - obtain the REFCNT value of a referent
SYNOPSIS
use Devel::Refcount qw( refcount );
my $anon = [];
print "Anon ARRAY $anon has " . refcount($anon) . " reference
";
my $otherref = $anon;
print "Anon ARRAY $anon now has " . refcount($anon) . " references
";
DESCRIPTION
This module provides a single function which obtains the reference count of the object being pointed to by the passed reference value.
FUNCTIONS
$count = refcount($ref)
Returns the reference count of the object being pointed to by $ref.
COMPARISON WITH SvREFCNT
This function differs from "Devel::Peek::SvREFCNT" in that SvREFCNT() gives the reference count of the SV object itself that it is passed,
whereas refcount() gives the count of the object being pointed to. This allows it to give the count of any referent (i.e. ARRAY, HASH,
CODE, GLOB and Regexp types) as well.
Consider the following example program:
use Devel::Peek qw( SvREFCNT );
use Devel::Refcount qw( refcount );
sub printcount
{
my $name = shift;
printf "%30s has SvREFCNT=%d, refcount=%d
",
$name, SvREFCNT($_[0]), refcount($_[0]);
}
my $var = [];
printcount 'Initially, $var', $var;
my $othervar = $var;
printcount 'Before CODE ref, $var', $var;
printcount '$othervar', $othervar;
my $code = sub { undef $var };
printcount 'After CODE ref, $var', $var;
printcount '$othervar', $othervar;
This produces the output
Initially, $var has SvREFCNT=1, refcount=1
Before CODE ref, $var has SvREFCNT=1, refcount=2
$othervar has SvREFCNT=1, refcount=2
After CODE ref, $var has SvREFCNT=2, refcount=2
$othervar has SvREFCNT=1, refcount=2
Here, we see that SvREFCNT() counts the number of references to the SV object passed in as the scalar value - the $var or $othervar
respectively, whereas refcount() counts the number of reference values that point to the referent object - the anonymous ARRAY in this
case.
Before the CODE reference is constructed, both $var and $othervar have SvREFCNT() of 1, as they exist only in the current lexical pad. The
anonymous ARRAY has a refcount() of 2, because both $var and $othervar store a reference to it.
After the CODE reference is constructed, the $var variable now has an SvREFCNT() of 2, because it also appears in the lexical pad for the
new anonymous CODE block.
PURE-PERL FALLBACK
An XS implementation of this function is provided, and is used by default. If the XS library cannot be loaded, a fallback implementation in
pure perl using the "B" module is used instead. This will behave identically, but is much slower.
Rate pp xs
pp 225985/s -- -66%
xs 669570/s 196% --
SEE ALSO
o Test::Refcount - assert reference counts on objects
AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
perl v5.14.2 2011-11-15 Devel::Refcount(3pm)