|
PureBytes Links
Trading Reference Links
|
Some extra reading about /3G Windows OS switch:
http://blogs.technet.com/askperf/archive/2007/03/23/memory-management-demystifying-3gb.aspx
On 2010-01-14 11:03, Tomasz Janeczko wrote:
> Hello,
>
> In fact you should DECREASE maximum megabytes and set number of symbols
> to 11. 10 has special meaning "adjust automatically". Also it was
> discussed in the past that using 32 bit operating system you are NOT able
> to use more than 2GB of memory per application (or 3GB with /3G BOOT.INI
> switch). This is limitation of 32-bit operating system and 32-bit
> addressing. For AmiBroker capabilities regarding addressable memory see:
> http://www.amibroker.com/guide/compat.html
>
> So first thing you should do is to adjust your BOOT.INI setting by
> adding /3G switch in order to enable Windows to actually see more
> memory. Even with that 32-bit Windows is not capable of using more than
> 3.5GB RAM (without PAE) in total because 0.5 GB of address space is
> usually reserved for graphic card, and other I/O cards, etc.
>
> The /3GB switch allocates 3 GB of virtual address space to an
> application that uses IMAGE_FILE_LARGE_ADDRESS_AWARE in the process
> header (AmiBroker has it). This switch allows applications to address 1
> GB of additional virtual address space above 2 GB.
>
> The following example shows how to add the /3GB parameter in the
> Boot.ini file to enable application memory tuning:
> [boot loader]
> timeout=30
> default=multi(0)disk(0)rdisk(0)partition(2)\WINNT
> [operating systems]
> multi(0)disk(0)rdisk(0)partition(2)\WINNT="Your Windows with 3GB
> support" /3GB
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
>
> On 2010-01-14 07:34, Christopher wrote:
>
>> Thanks Marc and ReefBreak,
>>
>> I used Task Manager to determine that the memory limit in AmiBroker is causing my problem. I tried adjusting the memory settings in the Data Preferences tab, but they seem insufficient for my purposes. I cannot set number of symbols to something less than 10, and I cannot increase maximum megabytes over 1023. Are there hidden registry flags to modify these restrictions?
>>
>> I am working with large histories for a very small number of symbols, and it seems that I could avoid the crashes and avoid having to manually flush the cache if I could only set the number of symbols to something in the 3-5 symbol range, or if I could increase the max cache memory to make better use of my RAM.
>>
>> Actually, I thought I had 4GB RAM on this machine, but it turns out that I only have 2.5GB right now. Does the max cache size increase if I add more RAM? Does it also increase if I go to x64 platform?
>>
>> It would be nice if AmiBroker (or the plugin for IQFeed) automatically flushed the cache instead of crashing. Seems like this shouldn't be happening. Is there at least a keyboard shortcut to flush the cache, so that I don't have to keep going to database settings dialog?
>>
>> I wanted to thank everyone who responded to my post. It has been frustrating getting all setup for using AmiBroker to backtest my ideas (I just want to trade!)
>>
>> Good Trading,
>> Chris
>>
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, "de_techneut"<twistedcharts@xxx> wrote:
>>
>>
>>> Hi Chris,
>>>
>>> in order to check memory in detail you can use:
>>> CTRL+ALT+DELETE and then select task manager.
>>>
>>> there you'll be able to look at the processes running on your computer.
>>> it is possible to add columns to the viewing screen.
>>> one of the columns is peak memory usage.
>>> it'l tell you if one application is using excessive memory.
>>>
>>> btw: it doesn't seem logical that IQfeed plugin is the problem as it is an official amibroker release( althou i don't use it myself ).
>>>
>>> it is more likely that an other faulty plugin or dll is causing this.
>>> i have wrecked computers because a program i was using was not handling memory like it should with frequent BSOD's as a result.
>>> when that happens often enough the whole computer will suffer...
>>>
>>> hope this helps
>>>
>>> Marc
>>>
>>>
>>
>> ------------------------------------
>>
>> **** 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
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/amibroker/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/amibroker/join
(Yahoo! ID required)
<*> To change settings via email:
amibroker-digest@xxxxxxxxxxxxxxx
amibroker-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
amibroker-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|