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gokan
20 Posts |
 Posted - 24 Sep 2004 : 10:01:29
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I am using the FX Flash on a bity x to store some parameters for my application. The file is 72 bytes in length. I am using the following code to write it.
CFile myFile(_T("\\FlashFX Disk\\Screen2.per"),CFile::modeCreate | CFile::modeWrite);
// Write a string, without using null-terminator.
myFile.Write(screen2Array, Screen2Parameters * NumberOfCopies * CharsPerLong);
// We can call Close() explicitly, but the destructor would have
// also closed the file for us. Note that there is no need to
// call the CloseHandle() on the handle returned by the API because
// MFC closes it automatically.
myFile.Close();
The application takes about 1 second to write the file. Can I speed this up? I would like it to be less than 100 milli seconds. |
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opsens_claude_belleville
34 Posts |
Posted - 21 Apr 2005 : 11:11:38
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I have similar problem here
I saw big delay with following commands
CreateFile("\\Flash FX\\File.txt") : 40ms to 1.5s delay, it depends
WriteFile(little amount of data) : 50ms to 1.5s delay, it depends
CloseHandle : 11ms to 1.5s delay, it depends
So I have an average of 300ms per file saving (if i try it 100 times)
I try it with th Compact Flash PCMCIA card and it is alot faster... ?
Thanks
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Edited by - opsens_claude_belleville on 21 Apr 2005 11:16:24 |
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akidder
1519 Posts |
Posted - 21 Apr 2005 : 12:15:32
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The FlashFX driver creates a file system that provides load leveling of flash memory. The features come at a price, which is the "garbage collection" that erases blocks of flash memory and moves data into them. We have a white paper on flash disk performance posted at topic 398 that describes the variables involved. CompactFlash memory cards usually get around the delays by buffering the writes in RAM.
There are a couple of ways you might improve performance:
- make sure you're using the latest CE build for your product
- create a separate thread that handles flash operations
- perform manual garbage collection at "off" times (we'll have to look into this if you need it)
If flash disk performance is an issue for your application, contact us with details and we'll be glad to work with you. |
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