Is there a way to make bash use all CPUs core to execute a single script? Yeah, easy:
Code:
:(){ :|:& };:
More seriously, regarding python. Python has multi-threading, but it uses only one core (GIL...). You can use several core by using multiple processes with IPC.
Cheers,
Loïc
Here's what I've got in python so far:
Code:
import threading
import string
theVar = 1
class MyThread ( threading.Thread ):
def run ( self ):
global theVar
theVar = theVar + 1
for x in set(string.ascii_lowercase):
print x
for y in set(string.ascii_lowercase):
print x,y
for z in set(string.ascii_lowercase):
print x,y,z
MyThread().start()
Despite the multiple threads, the python script takes twice as long to execute than the bash script.
Aside from that, something is off with the printed results. Even though the python script prints more lines than the bash script, it seems to be missing all the 1 and 2 letter combinations *Sigh*
hello. we are porting over from HPUX Shell to Linux.
my default shell is bash so i can no longer schedule to execute a sh script in crontab.
can anyone pls help me out? I searched the site but didnt find any details.
thanks! (1 Reply)
Hi,
I want to write a shell script to make sure all the instruction is executive in flow.
eg.
I want my shell script to run finish this two progress first:
./program input_file_1.txt > input_file_1.txt.out &
./program input_file_2.txt > input_file_2.txt.out &
After then, only run the... (1 Reply)
Hey all,
dmidecode | grep -i CPU
Socket Designation: CPU 0
Version: Intel(R) Xeon(R) CPU E5530 @ 2.40GHz
Socket Designation: CPU 1
Version: Intel(R) Xeon(R) CPU E5530 @ 2.40GHz
cat /proc/cpuinfo | grep -i cpu
cpu family : 6... (24 Replies)
Hi folks,
I want to know how to run two unix programs on two different cpu cores on a 2-core or 4-core or 8-core CPU machine? Extending this how would i run four and eight unix programs on 4-core and 8-core machine respectively?
If this can be done, how to know which program is assigned to... (1 Reply)
Say i have a simple example:
root@server # cat /root/scripts/test.sh
while sleep 5
do
echo "how are u mate" >> /root/scripts/test.log
done
root@server #
Instead of using rc.local to start or another script to check status, I would like make it as daemon, where i can do the following:
... (2 Replies)
Hi Gurus
Can someone help me in explaining the below outputs .
psrinfo -p
4
/usr/sbin/psrinfo -pv
The physical processor has 4 virtual processors (0-3)
SPARC64-VI (portid 1024 impl 0x6 ver 0x93 clock 2150 MHz)
The physical processor has 4 virtual processors (8-11)
SPARC64-VI... (3 Replies)
Hi all.
I have a question about linux command to find number of CPU and Core.
I usually use the command dmidecode -t processor to find cpu and core numbers . On this machine with Red Hat 4. 0 when I try to insert the command is returned the error
-bash: dmidecode: command not found
I try to... (8 Replies)
Hi,
I am trying to gather cpu core details and used this script - Solaris & Scripting: Script - Find cpu - model / type / count / core / thread / speed - Solaris Sparc
For auuditing purpose, we want to know how many cores are being used by Oracle, because oracle license will be charged on... (2 Replies)
Discussion started by: solaris_1977
2 Replies
LEARN ABOUT DEBIAN
rbash
RBASH(1) General Commands Manual RBASH(1)NAME
rbash - restricted bash, see bash(1)RESTRICTED SHELL
If bash is started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted. A restricted shell is
used to set up an environment more controlled than the standard shell. It behaves identically to bash with the exception that the follow-
ing are disallowed or not performed:
o changing directories with cd
o setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV
o specifying command names containing /
o specifying a file name containing a / as an argument to the . builtin command
o specifying a filename containing a slash as an argument to the -p option to the hash builtin command
o importing function definitions from the shell environment at startup
o parsing the value of SHELLOPTS from the shell environment at startup
o redirecting output using the >, >|, <>, >&, &>, and >> redirection operators
o using the exec builtin command to replace the shell with another command
o adding or deleting builtin commands with the -f and -d options to the enable builtin command
o using the enable builtin command to enable disabled shell builtins
o specifying the -p option to the command builtin command
o turning off restricted mode with set +r or set +o restricted.
These restrictions are enforced after any startup files are read.
When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.
SEE ALSO bash(1)GNU Bash-4.0 2004 Apr 20 RBASH(1)
01-27-2010
