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Bill Allombert on Mon, 30 Jun 2025 12:40:23 +0200
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Re: Forprime and posix multithreading
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- To: pari-users@pari.math.u-bordeaux.fr
- Subject: Re: Forprime and posix multithreading
- From: Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>
- Date: Mon, 30 Jun 2025 12:40:19 +0200
- Delivery-date: Mon, 30 Jun 2025 12:40:23 +0200
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On Mon, Jun 30, 2025 at 10:14:13AM +0000, Piercarlo Giannattasio wrote:
> Good morning,
> I'm trying to code a prime number generator in a specified range, using GP
> and C, and I need to reduce processing times.
What is a prime number generator ? How is it different from forprime ?
> I'm trying to use forprime and posix multithreading, but when executing the
> code I'm exceeding the parisizemax. I've tried with 1-15 threads, assigning
> 16GB of memory only to PARI, but I still get the same error: sometimes it
> only calculates the first iteration of forprime_next...
You need to set threadsizemax too.
> Also, is there any technical documentation for the C implementation, besides
> the one I'm studying (User Guide, Tutorial, Introduction to gp2c,
> Introduction to Parallel GP) ?
Thre are the libpari manual, the examples directory, and of course the PARI source code.
But I suggest you send me your code, I will tell you what you need to read.
Cheers,
Bill.