Re: [sqlmap-users] CPU utilization

[Kasper F. <th...@ma...>]

Dead Miroslav

That was not the point I was trying to make. It would ofcourse be nice 
to utilize the 100% of my computer when a program wants to, but I can 
see that python is crippled in the matter. But what I was asking about was:
I think it is strange that sqlmap uses 50% of my cpu - What operations 
could require that much cpu? It seems that if a connection to a target 
is slow, sqlmap still uses 50% of the cpu. Is it besy-waiting for the 
thread that is doing the I/O operation to complete?

I'll try again:
I would see sqlmap's main bottlenet as the internet connection. I can't 
find anything to justify to use my CPU as much as it does. Therefore I 
think some thread is besy-waiting, which really cripples the system 
(especially if I only had 1 CPU). So my question is, is it busy-waiting?

PS: Thanks for the nice link. Was interesting reading.

/Kasper

On 15-03-2010 13:17, Miroslav Stampar wrote:
> Dear Kasper.
>
> Python has an "technical" issue dealing with multithreading programs.
> In part that it can't run threads on multiple cores, it has a really
> nasty "GIL" problem which is discussed here:
> http://www.snaplogic.com/blog/?p=94. Threading of sqlmap really speeds
> it up, but the side effect is that CPU-throttling you are talking
> about, especially in a high number of threads used.
>
> Kind regards.
>
> On Mon, Mar 15, 2010 at 12:55 PM, Kasper Føns<th...@ma...>  wrote:
>    
>> Hello sqlmap users.
>>
>> I have a question about how sqlmap utilizes the cpu. On my computer the
>> CPU being utilized is nearly always 50%, and since I have two cores I
>> suspect some thread to be in deadlock or maybe doing busy-waiting.
>> If using busy-waiting, I would suggest using an event-based approach
>> instead.
>>
>> /Kasper
>>
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