Well yes and no...
Your explantion is correct, but here is what is happening:
Of all 8 threads that show up in Task Manager, all other threads are less then
10%, while the 3rd thread was AmiBroker and it never exceeded 80% and bounced
mostly between 65 and 80 percent for the entire 2 minutes of the Explore.
Any thoughts ?
--- In amibroker@yahoogroups.com, Tomasz Janeczko <gro...@...> wrote:
>
> Hello,
>
> 12% of CPU shown in task manager is an AVERAGE for all cores and
> it actually means that one core runs at FULL (100%) LOAD.
> (i7 presents to the system as 8 "processors" because of 4 cores with
> hyperthreading).
>
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
>
> On 2010-06-28 20:36, gmorlosky wrote:
> > Ok.. after really studying what you all are saying, then this is the
> > conclusion:
> >
> > CPU primary core is running at 3.5 mhz and 12% capacity, so the CPU is not
> > the bottleneck.
> >
> > Data was moved to a ramdisk and no improvement, so the data transfer from
> > the harddrive is not the bottleneck.
> >
> > Memory is now tied direct to the CPU controller in an i7 system, so most
> > likely the 1600 mhz memory with a larger data path is not the bottleneck.
> >
> > So where is the bottleneck ?
> >
> > Thanks.
> >
> >
> >
> > --- In amibroker@yahoogroups.com, Tomasz Janeczko<groups@> wrote:
> >> Correction, I meant Level3 shared cache (L1& L2 are per-core) on i7.
> >>
> >> On 2010-06-28 11:32, Tomasz Janeczko wrote:
> >>> Hello,
> >>>
> >>> I would only add to excellent Dennis' explanation, that theoretical 16x
> >>> speedup with 4 cores makes one assumption:
> >>> that you do not use shared memory extensively. Shared memory (i.e. system
> >>> RAM) is slower than single processor core.
> >>> Therefore if all cores fight for RAM access, you will not get any speedup
> >>> if you run out of on-chip cache.
> >>> You would be able to reach 4 times the performance of single core if and
> >>> only if entire code and data are on Level-1 (dedicated core)
> >>> cache. Even if data are on very fast Level2 on-chip cache (which is
> >>> shared on Intel i7) you may not see full theoretical performance.
> >>>
> >>> Best regards,
> >>> Tomasz Janeczko
> >>> amibroker.com
> >>>
> >>> On 2010-06-28 04:09, Dennis Brown wrote:
> >>>> Glenn,
> >>>>
> >>>> You are not hearing what is being said to you. You have a 4 core
> >>>> processor, with each core slightly faster than your old machine (clock
> >>>> speed), though larger on chip cache, larger main memory and somewhat
> >>>> faster system components will benefit your speed. Each core may also do
> >>>> more work in one clock cycle due to advanced architecture design.
> >>>> AmiBroker can only use one core. However, the other system processes
> >>>> can use the other cores, so they will not detract from the AB
> >>>> performance.
> >>>>
> >>>> You are getting a 4x improvement. That is fantastic! The larger memory
> >>>> is likely the main reason you are getting so much better performance.
> >>>> Without the memory boost you might see less than 2x improvement.
> >>>>
> >>>> The likely maximum overall performance improvement of your new system
> >>>> over the old, if all cores could be utilized 100% would be about 16x.
> >>>> So you can now watch a video or listen to music at the same time as your
> >>>> explore, and it is not likely to affect your explore time much.
> >>>>
> >>>> Be happy!
> >>>>
> >>>> Dennis
> >>>>
> >>>>
> >>>>
> >>>> On Jun 27, 2010, at 8:30 PM, gmorlosky wrote:
> >>>>
> >>>>> Well....
> >>>>>
> >>>>> I loaded a RAMDisk program called Dataram RAM Disk and moved the entire
> >>>>> database (333mb) over there. Started AmiBroker and of course it asks
> >>>>> where is the data and I point it to the new database. I run the same
> >>>>> Explore and guess what....NO faster....It still took 2 minutes and a
> >>>>> few seconds to process the Explore.
> >>>>>
> >>>>> So what do make of that ?
> >>>>>
> >>>>> Thanks for any help
> >>>>> -Glenn
> >>>>>
> >>>>>
> >>>>> --- In amibroker@yahoogroups.com, "gmorlosky"<gmorlosky@> wrote:
> >>>>>> TJ;
> >>>>>>
> >>>>>> That's a good point about SEEK time - I guess if I were to put the
> >>>>>> data on a SSD drive that might cut down some time, but then moving it
> >>>>>> to a RamDisk might help even more.
> >>>>>>
> >>>>>> Thanks
> >>>>>> -Glenn
> >>>>>>
> >>>>>>
> >>>>>> --- In amibroker@yahoogroups.com, Tomasz Janeczko<groups@> wrote:
> >>>>>>> Hello,
> >>>>>>>
> >>>>>>> You are dreaming.
> >>>>>>> Your new computer is 4 times faster than old one nothing more.
> >>>>>>>
> >>>>>>> Run some real-world application that is actually doing something
> >>>>>>> serious
> >>>>>>> CPU and disk intensive
> >>>>>>> (like C++ compiler) and you will see 4 times speed up as well.
> >>>>>>>
> >>>>>>> You computer may be faster than that on paper or in certain tasks
> >>>>>>> (like
> >>>>>>> video decoding,
> >>>>>>> because of SSE3 support) but from CPU + disk standpoint it is just
> >>>>>>> about
> >>>>>>> 4 times faster
> >>>>>>> nothing more. Disk access speeds did NOT improve even 4 times. Your
> >>>>>>> old
> >>>>>>> disk may have
> >>>>>>> 20 ms and new may have 16 ms access. Not much improvement. Bulk
> >>>>>>> transfer
> >>>>>>> rates
> >>>>>>> do NOT matter at all because with the exception of copying 1GB file
> >>>>>>> disk
> >>>>>>> must
> >>>>>>> SEEK and time is spent on seeking rather than transfering data.
> >>>>>>>
> >>>>>>> Best regards,
> >>>>>>> Tomasz Janeczko
> >>>>>>> amibroker.com
> >>>>>>>
> >>>>>>> On 2010-06-27 18:06, gmorlosky wrote:
> >>>>>>>> Hi TJ;
> >>>>>>>>
> >>>>>>>> I was saying overall my new system runs other application what seems
> >>>>>>>> like 50 times faster, but as you pointed out I am only getting 4
> >>>>>>>> times faster compared to that old system.
> >>>>>>>>
> >>>>>>>> Something isn't right here, it should be a lot faster.
> >>>>>>>>
> >>>>>>>> Any other thoughts ?
> >>>>>>>>
> >>>>>>>> Thnaks
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> --- In amibroker@yahoogroups.com, Tomasz Janeczko<groups@> wrote:
> >>>>>>>>
> >>>>>>>>> Hello,
> >>>>>>>>>
> >>>>>>>>> 2 minutes vs 8 minutes ? That is 4 times not 50% as you say.
> >>>>>>>>>
> >>>>>>>>> Your new system runs this exploration 4 times faster than old one.
> >>>>>>>>> That is actually faster than one could expect.
> >>>>>>>>>
> >>>>>>>>> Best regards,
> >>>>>>>>> Tomasz Janeczko
> >>>>>>>>> amibroker.com
> >>>>>>>>>
> >>>>>>>>> On 2010-06-27 14:26, gmorlosky wrote:
> >>>>>>>>>
> >>>>>>>>>> I am very disappointed in the speed I am getting running an
> >>>>>>>>>> Explore in AmiBroker 5.20. Here is my example:
> >>>>>>>>>>
> >>>>>>>>>> Both units are running the same 32 bit version of Amibroker 5.20,
> >>>>>>>>>> running the same Explore I created, with no other software other
> >>>>>>>>>> than basic antivirus running.
> >>>>>>>>>> ***********************************
> >>>>>>>>>> Old system (about 7 years):
> >>>>>>>>>> Pentium D (single core) 2.4 mhz, 1 gig memory 233 mhz, 5400 rpm
> >>>>>>>>>> drive, Windows XP Pro
> >>>>>>>>>>
> >>>>>>>>>> Results of Explore (5500 sysmbols):
> >>>>>>>>>> CPU usage 100%, 8 minutes 5 seconds
> >>>>>>>>>> ***********************************
> >>>>>>>>>> New system (about 2 months):
> >>>>>>>>>> i7-930 (quad core) 2.6 mhz, 6 gig memory 1600 mhz, 7200 high rpm
> >>>>>>>>>> drive, Windows 7 64 bit
> >>>>>>>>>>
> >>>>>>>>>> Results of Explore (5500 sysmbols):
> >>>>>>>>>> CPU usage 12%, 2 minutes 3 seconds
> >>>>>>>>>> ***********************************
> >>>>>>>>>> Why so stinking slow ??? when the new system is roughly 50 times
> >>>>>>>>>> faster in overall processing ???
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> ------------------------------------
> >>>>>>>>>>
> >>>>>>>>>> **** IMPORTANT PLEASE READ ****
> >>>>>>>>>> This group is for the discussion between users only.
> >>>>>>>>>> This is *NOT* technical support channel.
> >>>>>>>>>>
> >>>>>>>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>>>>>>> SUPPORT {at} amibroker.com
> >>>>>>>>>>
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> >>>>>>>>>> http://www.amibroker.com/feedback/
> >>>>>>>>>> (submissions sent via other channels won't be considered)
> >>>>>>>>>>
> >>>>>>>>>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >>>>>>>>>> http://www.amibroker.com/devlog/
> >>>>>>>>>>
> >>>>>>>>>> Yahoo! Groups Links
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>> ------------------------------------
> >>>>>>>>
> >>>>>>>> **** IMPORTANT PLEASE READ ****
> >>>>>>>> This group is for the discussion between users only.
> >>>>>>>> This is *NOT* technical support channel.
> >>>>>>>>
> >>>>>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>>>>> SUPPORT {at} amibroker.com
> >>>>>>>>
> >>>>>>>> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> >>>>>>>> http://www.amibroker.com/feedback/
> >>>>>>>> (submissions sent via other channels won't be considered)
> >>>>>>>>
> >>>>>>>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >>>>>>>> http://www.amibroker.com/devlog/
> >>>>>>>>
> >>>>>>>> Yahoo! Groups Links
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>
> >>>>> ------------------------------------
> >>>>>
> >>>>> **** IMPORTANT PLEASE READ ****
> >>>>> This group is for the discussion between users only.
> >>>>> This is *NOT* technical support channel.
> >>>>>
> >>>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>>> SUPPORT {at} amibroker.com
> >>>>>
> >>>>> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> >>>>> http://www.amibroker.com/feedback/
> >>>>> (submissions sent via other channels won't be considered)
> >>>>>
> >>>>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >>>>> http://www.amibroker.com/devlog/
> >>>>>
> >>>>> Yahoo! Groups Links
> >>>>>
> >>>>>
> >>>>>
> >>>> ------------------------------------
> >>>>
> >>>> **** IMPORTANT PLEASE READ ****
> >>>> This group is for the discussion between users only.
> >>>> This is *NOT* technical support channel.
> >>>>
> >>>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>>> SUPPORT {at} amibroker.com
> >>>>
> >>>> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> >>>> http://www.amibroker.com/feedback/
> >>>> (submissions sent via other channels won't be considered)
> >>>>
> >>>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >>>> http://www.amibroker.com/devlog/
> >>>>
> >>>> Yahoo! Groups Links
> >>>>
> >>>>
> >>>>
> >>>>
> >>> ------------------------------------
> >>>
> >>> **** IMPORTANT PLEASE READ ****
> >>> This group is for the discussion between users only.
> >>> This is *NOT* technical support channel.
> >>>
> >>> TO GET TECHNICAL SUPPORT send an e-mail directly to
> >>> SUPPORT {at} amibroker.com
> >>>
> >>> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> >>> http://www.amibroker.com/feedback/
> >>> (submissions sent via other channels won't be considered)
> >>>
> >>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> >>> http://www.amibroker.com/devlog/
> >>>
> >>> Yahoo! Groups Links
> >>>
> >>>
> >>>
> >>>
> >
> >
> >
> > ------------------------------------
> >
> > **** IMPORTANT PLEASE READ ****
> > This group is for the discussion between users only.
> > This is *NOT* technical support channel.
> >
> > TO GET TECHNICAL SUPPORT send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
> > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> > http://www.amibroker.com/feedback/
> > (submissions sent via other channels won't be considered)
> >
> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > http://www.amibroker.com/devlog/
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
