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Top Forums UNIX for Dummies Questions & Answers Is it possible to combine multiple CPU to act as a single CPU on the same server? Post 302892212 by vbe on Tuesday 11th of March 2014 01:36:18 PM
Old 03-11-2014
That I understand..
OK on HP-UX when I had this sort of issues, I used to dedicate a CPU to that application or user ... he would find himself as if on a single cpu box... only it will run at the speed of the cpu...
kernel params, to allow big - long processes to use all the cpu, I used to change the timeslice, but this is very tricky : You fall on badly written code, and you have lost control of your server... So although this can accelerate your application it has some terrible side effects, because the parameter affects all the system... I used to fine tune a kernel specificly for batches, and compile a kernel for that purpose, then its just a question of swaping kernel and reboot...

You have to accept the idea that 2 CPU 1GHz cannot do 1CPU@2GHz, and so will have to tune what you can, to reduce I/O , disk access etc.. and to remember the better is the ennemy of Good...

You are left analysing why you have performance issues and try to find workarounds, and I tell you there are
 

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CPU(1)							      General Commands Manual							    CPU(1)

NAME
cpu - connection to cpu server SYNOPSIS
cpu [ -h server ] [ -c cmd args ... ] DESCRIPTION
Cpu starts an rc(1) running on the server machine, or the machine named in the $cpu environment variable if there is no -h option. Rc's standard input, output, and error files will be /dev/cons in the name space where the cpu command was invoked. Normally, cpu is run in an 81/2(1) window on a terminal, so rc output goes to that window, and input comes from the keyboard when that window is current. Rc's cur- rent directory is the working directory of the cpu command itself. The name space for the new rc is an analogue of the name space where the cpu command was invoked: it is the same except for architecture- dependent bindings such as /bin and the use of fast paths to file servers, if available. If a -c argument is present, the remainder of the command line is executed by rc on the server, and then cpu exits. The name space is built by running /usr/$user/lib/profile with the root of the invoking name space bound to /mnt/term. The service envi- ronment variable is set to cpu; the cputype and objtype environment variables reflect the server's architecture. FILES
The name space of the terminal side of the cpu command is mounted on the CPU side on directory /mnt/term. SOURCE
/sys/src/cmd/cpu.c SEE ALSO
rc(1), 81/2(1) BUGS
Binds and mounts done after the terminal lib/profile is run are not reflected in the new name space. CPU(1)
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