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Automatically set all process to -19

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Pepi:
I have edited limits.conf
and set to root hard priority -19 and/or root soft priority -19 ( I login as root) (tried both version)
When I start Boinc it is set to -19 and that is ok, but when I start calculating Primegrid in the Boinc ,4 process are set to 19.
I can set it with renice to -19, but that is ok until process is finished and pid is changed,then priority is again 19.
How to solve this?

Centos 6 86_64
AuthenticAMD
AMD Phenom(tm) II X4 B50 Processor [Family 16 Model 5 Stepping 3]
(4 processors) ---
Linux 2.6.32-71.29.1.el6.x86_64

I would like to test, is with priority -19 crunching is faster or same as with priority 19, so that is reason why I try this.
Thanks for reply

sunu:
Quite some time ago I tried seti@home with negative niceness and it was slower than 0.

Running with -19 will probably lock your computer. Use no less than 0.

So, do you want everything boinc related to run at 0 or only some of the tasks?

Pepi:
Yesterday  , I run many WU with priority -19 without any problems. That computer only crunch Primegrid, and  dont  do anything else. So what I wont :  boinc process run at -19, ( and got that) but app for crunching Primegrid go to 0. I wont they also go to -19. Manually setting works until app crunch WU, but when finished, pid is changed and again it is priority 0.

sunu:
Put in your cc_config.xml the following:

    <options>
   <no_priority_change>1</no_priority_change>
    </options>

Pepi:
There si primegrid_llr_wrapper and primegrid_sllr_3.8.4 : so that are two applications.
When I don't use    <no_priority_change>1</no_priority_change> then primegrid_llr_wrapper is showing rarely and have priority 19
When I use <no_priority_change>1</no_priority_change> then primegrid_llr_wrapper is showing often but have priority -19
But in both cases primegrid_sllr_3.8.4 ( which I believe) is main app have priority 19.  So some progress are made: i will now leave under night to see
how this change ( or will be) this change reflect on crunch time.

So rise of priority of primegrid_sllr_3.8.4 will remain unsolved, but now is one step closer :)
 
UPDATE: you was right: I test it on 8 WU and it was slower, in both cases (2 *4 WU) all are finished in nearly same , near longest time I have had.
So now I will try new tactic: using syntax enabled: I will start BOINC then download few WU in cache, and then raise priority of  primegrid_sllr_3.8.4 but not  primegrid_llr_wrapper.

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