I need help editing my openwin file. I've got it all set up so the options I normally use (xman, cmdtools, xeyes, printtool) automatically come up when I log on, but it won't read my -geometry entries. I got them by right-clicking on the desktop, but apparently they need to be entered a certain... (0 Replies)
How to get the current working directory as part of the command prompt? Every time I chage the folder, my command prompt path shoud change. I am using Korn Shell. Any help is greatly appreciated. (3 Replies)
Hello Every One,
I am not sure if this is the correct forum to post this question. But please help me with your ideas.
I have got a work (proj) where i need to customize the RHEL OS . This would involve building packages, installing them , correcting privileges etc and all these... (4 Replies)
When I use "/" to look for a particular command that I typed in the current session it says
D02:-/home/user1/temp> /job
ksh: /job: not found.
D02:-/home/user1/temp>
previously it used to fetch all the commands which had job in it..
for example subjob, endjob, joblist etc...
may I... (7 Replies)
I have used this color prompt on my servers for long time, in file ~\.bashrc
Black="\"
Dark="\"
Blue="\"
LBlue="\"
Green="\"
LGreen="\"
Cyan="\"
LCyan="\"
Red="\"
LRed="\"
Purple="\"
LPurple="\"
Brown="\"
Yellow="\"
LGray="\"
White="\"
Reset="\"
PS1="$Yellow\u@\h $LBlue\w... (4 Replies)
Hi,
I want to monitor our batch jobs at a specific interval for later analysis to see the performance and CPU utilization
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
ps aux|grep dsadm|head
xxxxx 386 0.0 0.0 103524 15448 pts/0 S Mar27 0:00... (6 Replies)
Hello Experts,
I am performing performance tests on a few mysql select queries.
I use the following command to clear the memory disk caches.
sync && echo 3 | sudo tee /proc/sys/vm/drop_caches
I however see that the above command works on RHEL6 but doesn't work on Solaris 10.
I asked... (4 Replies)
Hi,
I am trying to run this command to connect to each server without being prompted for the password. How can I do this in Linux redhat 7.2:
for HOST in $VIPS; do
su - Myadminid -c "ssh -o ConnectTimeout=10 $HOST 'date; hostname; pkill -9 -f -u Myadminid xx00 ; ps -ef |grep Myadminid'" ... (7 Replies)
So Yesterday I switched from Solus Linux to Fedora Linux 30, but I forgot to backup some of my dotfiles including kshrc. I am fairly new to Korn shell and do not know it well, but through memory I was able to at least get this. I did use code from several different source to recreate it. The only... (13 Replies)
Discussion started by: zoomer
13 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)