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[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
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[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
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Parallella Community • View topic - [SOLVED] Parallella memory random behaviour

[SOLVED] Parallella memory random behaviour

Hardware related problems and workarounds

[SOLVED] Parallella memory random behaviour

Postby SoMia » Sun Jun 26, 2016 1:09 pm

Hi All,

when i try to run my code which i use the external memory of parallella to read input file and to store output file , memory has random behaviour which mean that first run it results no output , second run the output appears , or first run output apear then second run output deosn`t apear and so on ... every run has different output .

can you help me ?
SoMia
 
Posts: 8
Joined: Mon Mar 07, 2016 3:10 pm

Re: Parallella memory random behaviour

Postby sebraa » Sun Jun 26, 2016 8:41 pm

Accesses to off-core memory (this is especially true for external memory, less for on-chip memory) do not follow strongly-ordered memory semantics. This means that writing to a variable and reading it often returns the previous value, not the one you just wrote! This behaviour is very timing-dependent.

Otherwise, check line 42 in your code.
sebraa
 
Posts: 495
Joined: Mon Jul 21, 2014 7:54 pm

Re: Parallella memory random behaviour

Postby SoMia » Thu Jun 30, 2016 11:49 am

SoMia
 
Posts: 8
Joined: Mon Mar 07, 2016 3:10 pm

Re: Parallella memory random behaviour

Postby polas » Thu Jun 30, 2016 3:06 pm

Can you post the code anywhere so we can look at it & advise. I suspect there are relatively simple approaches that can be adopted to solve this.
polas
 
Posts: 46
Joined: Thu Mar 05, 2015 9:41 pm

Re: Parallella memory random behaviour

Postby sebraa » Fri Jul 01, 2016 10:20 am

sebraa
 
Posts: 495
Joined: Mon Jul 21, 2014 7:54 pm


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