[DUG] Memory mapped Files with no file

[Ross Levis]

Hi Rob,

 

The sleep is in the separate thread, not main thread.

 

I'm not sure if in memory mapped files can be paged to disk but will
investigate.

 

Cheers,

Ross.

 

From: delphi-bounces at listserver.123.net.nz
[mailto:delphi-bounces at listserver.123.net.nz] On Behalf Of Robert Martin
Sent: Wednesday, 12 June 2013 9:05 AM
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] Memory mapped Files with no file

 

Hi

Don't know anything about memory mapped files but two comments...

1.  Try it without the sleep().   If the sleep is in the main thread it
could cause you problems.
2.  Perhaps you are low on RAM and the in memory file is actually having to
be paged to disk!  

Hope that's of some use :)
Rob

On 12/06/2013 12:02 a.m., Ross Levis wrote:

I'm using a shared memory component in 2 apps which communicate with each
other.

I use a shared memory component which uses a memory mapped file with no
actual file on the hard drive.

 

I seem to be having a problem with communications between the 2 apps when
the hard drive is busy.  It appears a change to the shared memory is not
showing up in the other app for over 20 seconds while the hard drive is
busy.  Does that sound possible in your opinion?

 

It doesn't make any sense to me but that's all I can come up with currently.
Communication appears to stop sometimes when a separate thread starts up
every 24 hours to load the contents of perhaps 3000 small files into RAM.
There is a sleep(15) between access of each file to prevent the drive being
too busy, but yet this issue can occur sometimes during the 30 odd seconds
this thread is running.

 

Cheers,
Ross.






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