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 [email protected]
<mailto:amibroker%40yahoogroups.com>, Tomasz Janeczko<gro...@...> 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 [email protected]
<mailto:amibroker%40yahoogroups.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 [email protected]
<mailto:amibroker%40yahoogroups.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 [email protected]
<mailto:amibroker%40yahoogroups.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 ???
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> ------------------------------------
>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>> This is *NOT* technical support channel.
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>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>
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>>>>> This group is for the discussion between users only.
>>>>> This is *NOT* technical support channel.
>>>>>
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>>>>
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>>>>
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>>> ------------------------------------
>>>
>>> **** IMPORTANT PLEASE READ ****
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>>> 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/
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>>>
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>>>
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>>>
>>>
>>>
>>>
>
>
>
> ------------------------------------
>
> **** 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/
>
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>
>
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