POV-Ray : Newsgroups : povray.general : prase error on WinXp Server Time
3 Feb 2023 05:58:48 EST (-0500)
  prase error on WinXp (Message 1 to 3 of 3)  
From: Leroy
Subject: prase error on WinXp
Date: 4 Jan 2023 14:30:00
Message: <web.63b5d2dde81c0ba21950d6ebf712fc00@news.povray.org>
I ran this with POV3.7 on my Xp 32bit and it crashed half way through
with a cannot parse Error.

#declare Thing=box{-1,1}
#for(i,-2048,2048)
 #for(j,-2048,2048)
   object{Thing pigment{rgb 1} translate <i,j,0> }
 #end
#end

That computer has about a gig of memory.

I also used {box{-1,1} pigment{rgb 1} translate <i,j,0> }
 It crashed sooner.

I ran it with POV3.7 on my windows 10 64bit and it ran fine.
This computer has about 8 gig of memory.

which was the most important reason, memory size or bit count?


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From: Cousin Ricky
Subject: Re: prase error on WinXp
Date: 4 Jan 2023 16:27:50
Message: <63b5ef56$1@news.povray.org>
On 2023-01-04 15:27 (-4), Leroy wrote:
> I ran this with POV3.7 on my Xp 32bit and it crashed half way through
> with a cannot parse Error.
> 
> #declare Thing=box{-1,1}
> #for(i,-2048,2048)
>  #for(j,-2048,2048)
>    object{Thing pigment{rgb 1} translate <i,j,0> }
>  #end
> #end
> 
> That computer has about a gig of memory.
> 
> [snip]
> 
> I ran it with POV3.7 on my windows 10 64bit and it ran fine.
> This computer has about 8 gig of memory.

You are asking for 16,785,409 objects.  Unfortunately, POV-Ray 3.7 does
not give memory statistics, so I converted your scene to POV-Ray 3.6,
and ran it on my GNU/Linux machine with 1,000,000 objects.  It used
988,560,213 bytes, almost a gigabyte.  So yeah, you would have blown the
memory on the 32-bit computer early on.  My new question is why it even
worked on your 8 gig computer... unless 3.7 stores objects more
efficiently than 3.6?

> which was the most important reason, memory size or bit count?

Memory is certainly the deciding factor in this particular case, but bit
count is an  upstream factor, as a 32-bit machine cannot address more
than 4 gig.


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From: Alain Martel
Subject: Re: prase error on WinXp
Date: 5 Jan 2023 09:57:06
Message: <63b6e542$1@news.povray.org>
Le 2023-01-04 à 16:27, Cousin Ricky a écrit :
> On 2023-01-04 15:27 (-4), Leroy wrote:
>> I ran this with POV3.7 on my Xp 32bit and it crashed half way through
>> with a cannot parse Error.
>>
>> #declare Thing=box{-1,1}
>> #for(i,-2048,2048)
>>   #for(j,-2048,2048)
>>     object{Thing pigment{rgb 1} translate <i,j,0> }
>>   #end
>> #end
>>
>> That computer has about a gig of memory.
>>
>> [snip]
>>
>> I ran it with POV3.7 on my windows 10 64bit and it ran fine.
>> This computer has about 8 gig of memory.
> 
> You are asking for 16,785,409 objects.  Unfortunately, POV-Ray 3.7 does
> not give memory statistics, so I converted your scene to POV-Ray 3.6,
> and ran it on my GNU/Linux machine with 1,000,000 objects.  It used
> 988,560,213 bytes, almost a gigabyte.  So yeah, you would have blown the
> memory on the 32-bit computer early on.  My new question is why it even
> worked on your 8 gig computer... unless 3.7 stores objects more
> efficiently than 3.6?
> 
>> which was the most important reason, memory size or bit count?
> 
> Memory is certainly the deciding factor in this particular case, but bit
> count is an  upstream factor, as a 32-bit machine cannot address more
> than 4 gig.
> 
It worked on an 64 bits 8Gb system thank to virtual memory.
On the 32 bits system, even using the cache, it exceeded the hard 4Gb 
limit of adressable memory for a single process.


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