Re: [sqlmap-users] CPU utilization
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From: Miroslav S. <mir...@gm...> - 2010-03-15 12:49:47
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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 >>> >>> >>> ------------------------------------------------------------------------------ >>> Download Intel® Parallel Studio Eval >>> Try the new software tools for yourself. Speed compiling, find bugs >>> proactively, and fine-tune applications for parallel performance. >>> See why Intel Parallel Studio got high marks during beta. >>> http://p.sf.net/sfu/intel-sw-dev >>> _______________________________________________ >>> sqlmap-users mailing list >>> sql...@li... >>> https://lists.sourceforge.net/lists/listinfo/sqlmap-users >>> >>> >> >> >> > > -- Miroslav Stampar E-mail / Jabber: miroslav.stampar (at) gmail.com Mobile: +385921010204 (HR 0921010204) PGP Key ID: 0xB5397B1B |