Is there a way to make bash [or another shell] use all CPU cores to execute a single script?
I wrote a very simple script that matches combinations of alphabetic characters (1-5). I want to use it to test CPU speeds of different hardware/platforms. The problem is that on multi-core/processor systems, only one CPU is being utilized to execute the script. Is there a way to change that? Shouldn't the OS automatically start using the second, third, (etc..) CPU once the first one becomes overloaded?
The script:
Code:
#!/bin/bash
for a in {a..z}
do
for b in {a..z}
do
for c in {a..z}
do
x="$a$b$c"
done
done
done
echo $x
exit
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 NETBSD
psrset
PSRSET(8) BSD System Manager's Manual PSRSET(8)NAME
psrset -- control processor sets
SYNOPSIS
psrset [setid ...]
psrset -a setid cpuid ...
psrset -b setid pid ...
psrset -c [cpuid ...]
psrset -d setid
psrset -e setid command
psrset -i [setid ...]
psrset -p
psrset -r cpuid ...
psrset -u pid ...
DESCRIPTION
The psrset command can be used to control and inspect processor sets.
The system always contains at least one processor set: the default set. The default set must contain at least one online processor (CPU) at
all times.
Available options:
-a Assign one or more processors (CPUs) to the set setid. In the current implementation, a CPU may only be present in one set. CPU IDs
are as reported and used by the cpuctl(8) command.
-b Bind one or more processes to the set setid. All LWPs within the processes will be affected. Bindings are inherited when new LWPs
or processes are forked. However, setting a new binding on a parent process does not affect the bindings of its existing child pro-
cesses.
-c Create a new processor set. If successful, the ID of the new set will be printed. If a list of CPU IDs is provided, those CPUs will
be assigned to the set upon creation. Otherwise, the set will be created empty.
-d Delete the processor set specified by setid. Any LWPs bound to the set will be re-bound to the default processor set.
-e Execute a command within the processor set specified by setid.
-i List all processor sets. For each set, print the member CPUs. If psrset is run without any options, it behaves as if -i were given.
-p List all CPUs. For each CPU, print the associated processor set.
-r Remove a CPU from its current set, and return it back to the default processor set.
-u Bind the specified processes to the system default processor set.
SEE ALSO pset(3), cpuctl(8), schedctl(8)HISTORY
The psrset command first appeared in NetBSD 5.0.
BSD September 23, 2008 BSD
01-26-2010
