i limit .exe file but at the end its not limited

tomislav91 · 03-04-2019, 03:43 PM

I am using ubuntu 14.04
I am having a some sh script which contains

Code:

export __GL_THREADED_OPTIMIZATIONS=1
export GPU_MAX_HEAP_SIZE="100"
export GPU_MAX_ALLOC_PERCENT="100
cpulimit -l 20 wine MyProgram.exe

When i list

Code:

 ps ahux --sort=-c | awk 'NR<=5{printf"%s %6d %s\n",$3,$2,$11}'

i get more than 20, go to 30 percent
WHere am I wrong? I also added in visudo

Code:

%sudo   ALL = (ALL) NOPASSWD: /usr/bin/cpulimit

just to get rid of sudo user and so on.
My .exe consume more cpu. Don't know really why, and tried to limit, but no help.

berndbausch · 03-04-2019, 05:56 PM

Without really knowing the details of how cpulimit operates and how ps measures or reports CPU utilization:

cpulimit seems to work by stopping and continuing a process with signals. This is a crude method that can’t yield very precise results in my opinion. For example, it heavily depends on the overall CPU load how quickly cpulimit can send the signal, and how quickly the signal is delivered. Another factor: The wine process might not always be in a state that permits it to react to a stop signal. I’d say that in your case, getting 20% to 30% is not bad at all.

Have you tried launching cpulimit with a lower number?

A more sophisticated and probably finer-grained method of controlling CPU usage is cgroups.

scasey · 03-04-2019, 06:08 PM

As I understand it,

Code:

cpulimit -l 20 wine MyProgram.exe

is limiting the cpu available to wine, not to MyProgram.exe.

tomislav91 · 03-05-2019, 01:43 AM

Quote:

Originally Posted by scasey

As I understand it,

Code:

cpulimit -l 20 wine MyProgram.exe

is limiting the cpu available to wine, not to MyProgram.exe.

in fact yes, i limit my .exe which i run with wine, so yeah, wine is affect limiting.
Is this ok? Is there a better method for doing it?
I find this,but not seems to give results.

scasey · 03-05-2019, 10:49 AM

Quote:

Originally Posted by tomislav91

in fact yes, i limit my .exe which i run with wine, so yeah, wine is affect limiting.
Is this ok? Is there a better method for doing it?
I find this,but not seems to give results.

I think you missed my point. It's not the .exe that's being limited at all. It is wine that's being limited. wine is not affecting limiting...it is the program being limited.

Have you compared the cpu usage with and without cpulimit? Is there no difference at all?

Have you tried using the -v verbose option to see what's happening?

tomislav91 · 03-05-2019, 11:07 AM

Quote:

Originally Posted by scasey

I think you missed my point. It's not the .exe that's being limited at all. It is wine that's being limited. wine is not affecting limiting...it is the program being limited.

Have you compared the cpu usage with and without cpulimit? Is there no difference at all?

Have you tried using the -v verbose option to see what's happening?

now i think u are right. A slight difference. I red somewhere that wine use only 1 core, maybe that is issue, don't know really.

So it reach to 40%, even if I limit it to 20. Also you can see that I tried to use nice and give a more priority but no affect at all.
My program is working slowly and can freeze a sec and come back and so on. Cpu goes very high..

scasey · 03-05-2019, 12:30 PM

Quote:

Originally Posted by tomislav91

[snip]
My program is working slowly and can freeze a sec and come back and so on. Cpu goes very high..

That's how cpulimit works: from man cpulimit

Code:

       ·   cpulimit  always  sends  the  SIGSTOP and SIGCONT signals to a process, both to verify
           that it can control it and to limit the average amount of CPU it consumes.   This  can
           result  in  misleading  (annoying) job control messages that indicate that the job has
           been stopped (when actually it was, but immediately restarted).  This can  also  cause
           issues  with  interactive  shells  that detect or otherwise depend on SIGSTOP/SIGCONT.

tomislav91 · 03-06-2019, 01:49 AM

Quote:

Originally Posted by scasey

That's how cpulimit works: from man cpulimit

Code:

       ·   cpulimit  always  sends  the  SIGSTOP and SIGCONT signals to a process, both to verify
           that it can control it and to limit the average amount of CPU it consumes.   This  can
           result  in  misleading  (annoying) job control messages that indicate that the job has
           been stopped (when actually it was, but immediately restarted).  This can  also  cause
           issues  with  interactive  shells  that detect or otherwise depend on SIGSTOP/SIGCONT.

this start to happend before i use cpulimit

tomislav91 · 03-07-2019, 01:51 AM

I tried maybe to remove cache memory in cron job

Code:

#!/bin/bash
echo 3 > /proc/sys/vm/drop_caches && swapoff -a && swapon -a

constantly i have a problem that just that exe app cause to slow down, freeze, and so on. Bandwidth is ok, no problem to that side.

ondoho · 03-07-2019, 02:18 PM

^ and why would you want to do that?

dropping caches certainly won't improve performance.

Quote:

Originally Posted by berndbausch

cpulimit seems to work by stopping and continuing a process with signals. This is a crude method that can’t yield very precise results in my opinion. For example, it heavily depends on the overall CPU load how quickly cpulimit can send the signal, and how quickly the signal is delivered. Another factor: The wine process might not always be in a state that permits it to react to a stop signal. I’d say that in your case, getting 20% to 30% is not bad at all.

Have you tried launching cpulimit with a lower number?

A more sophisticated and probably finer-grained method of controlling CPU usage is cgroups.

totally agree.
i'm using cpulimits, but it's really not precise at all.
personally, i'm not going to start with cgroups for one single application that regularly gets my cpu fans spinning... crude is sufficient.

that said, i'm not sure it's a good idea to use that with wine.

tomislav91, why do you need to limt that program?

tomislav91 · 03-07-2019, 05:52 PM

Quote:

Originally Posted by ondoho

^ and why would you want to do that?

dropping caches certainly won't improve performance.

totally agree.
i'm using cpulimits, but it's really not precise at all.
personally, i'm not going to start with cgroups for one single application that regularly gets my cpu fans spinning... crude is sufficient.

that said, i'm not sure it's a good idea to use that with wine.

tomislav91, why do you need to limt that program?

i know that i maybe have a better option for using this app, but right now i am stuck with it and need to solve this issue of getting cpu at 100%
Look just one little period

I maybe dont need to limit it but dont have solution for being cpu so busy cause this app. I am sure that in app is not problem, within system is. I tried with new ubuntu 18 and ddr4 4gb ram and it is the same, so its strange, it looks that app is problem, but it is not, cause i am having problem on several workstation. internet is also good.
Don't have idea what to try to improve...