Re: [sqlmap-users] CPU utilization

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

Hi

I still don't get why sqlmap is using that much cpu then?

On 15-03-2010 13:49, Miroslav Stampar wrote:
> Hi Kasper.
>
> Threads are indeed in a blocking state while retrieving page content
> (basic socket blocking). Basic python urllib2 doesn't support
> asynchronous page retrievals, but we could put this on a feature
> request list (http://eventlet.net/doc/,
> http://twistedmatrix.com/trac/).
>
> Kind regards.
>
> On Mon, Mar 15, 2010 at 1:24 PM, Kasper Føns<th...@ma...>  wrote:
>    
>> 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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>>>>
>>>>          
>>>
>>>
>>>        
>>
>>      
>
>
>