[Gambas-user] Gambas performances

[Olivier Cruilles]

I tried the both solutions: SHELL and EXEC, but the parameters used  
are not the same for each command executed.

So, after many tries, I the EXEC command give me errors during  
execution because it's very difficult to play with the character " or  
' in the command.

I know that the EXEC command is faster than the SHELL command but  
SHELL command is easier to use for me.

At the beginning, it was just a question because you are the developer  
of Gambas project and you are better than me about all of
developing way in general.




Le 17 août 09 à 22:07, Benoît Minisini a écrit :

>> I measure the time to execute 730 snmpget commands started as process
>> (SHELL command) in a Gambas program.
>
> Why do you use SHELL to run snmpget? It runs the command inside "/ 
> bin/sh",
> which is very heavy.
>
>>
>>
>> In the first time I start 20 processes in the same time and when one
>> is finished, I start a new one to follow the list of requests
>> to execute.
>>
>> I measure the time from the first process started to the last process
>> finished.
>>
>> On the Celeron cpu, during all the time, the cpu is at 100%
>>
>> On the Dual-Core machine, during all the time, the both cpus are at
>> around 80%
>>
>> On the Xeon machine, during all the time, the both cpus are at around
>> 85%
>
> If process usage is less than 100% (provided that no other heavy  
> process runs
> on the machine), then that means that the CPU is fast enough, and  
> that the
> bottleneck is not the CPU. As the time taken by the OS to run shells  
> is not
> included in the cpu usage, I think you should really use EXEC  
> instead of
> SHELL.
>
>>
>> I try to change the network connection from Ethernet card 100 Mb to
>> 1Gb but nothing change in all cases.
>>
>
> So the network should not be the bottleneck - if, of course, the  
> network
> driver is fast enough to fill the 1Gb flow, but I think so.
>
>>
>> So it's really about cpu technology where the problem is.
>
> As I said before, I don't agree, until you use 100% of all cpu  
> cores, or 100%
> of one cpu core if you run one thing at once.
>
>> Maybe the
>> Xeon works really on SMP mode with a x86_64 distribution and
>> lesser with x86_32 kernel ?
>>
>> I don't understand why ?
>>
>> I use the official packages of Gambas on the Fedora 10 distribution.
>> Does you optimize the runtime of Gambas for x86_32 dual core cpu ?
>
> There is no architecture specific optimization at all in the  
> standard package,
> but anyone could add it easily I think.
>
> Regards,
>
> -- 
> Benoît
>
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Olivier Cruilles
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