#7013: [with code, needs review] prime_pi and nth_prime
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Reporter: kevin.stueve | Owner: kevin.stueve
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.1.2
Component: number theory | Keywords: primes, sieve, table,LMO
Reviewer: was,robertwb,GeorgSWeber | Author: Kevin Stueve
Merged: |
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Changes (by kevin.stueve):
* cc: robertwb, GeorgSWeber, kevin.stueve (added)
* reviewer: was => was,robertwb,GeorgSWeber
* milestone: => sage-4.1.2
Comment:
GeorgSWeber, I don't currently use Windows. I made the lzma file on
Ubuntu. I am currently unable to single-handedly make build scripts for
my code, because I don't have access to systems with every possible
operating system on which Sage might be run. Someone with access to
different environments could help with the build script for their
platform.
Note: On 64bit Ubuntu on an Acer I get the following with Silva's code
without using -m32 and installing special packages for 32bit mode. Can
anyone see how to make this better?
static void *get_memory(u32 size)
{
u32 m;
line 100:m = (u32)malloc(size + 255); // this assumes that
sizeof(void *) = sizeof(u32)
line 101:if((void *)m == NULL)
exit(1);
m = (m + 255) & ~255;
line 104:return (void *)m; // pointer aligned on a 256 byte boundary
}
~/Documents/Silva$ bash compile
Silva.c: In function ‘get_memory’:
Silva.c:100: warning: cast from pointer to integer of different size
Silva.c:101: warning: cast to pointer from integer of different size
Silva.c:104: warning: cast to pointer from integer of different size
~/Documents/Silva$ ./Silva
Segmentation fault
Please note that the Silva c and LMO c code work fine without any special
compiler options or libraries on a MacBookPro. The Silva c code works on
64bit Ubuntu when the proper -m32 compiler option is specified and a
library is installed that allows 32 bit mode (just Google the error you
get without it). The LMO c code on 64 bit Ubuntu I believe requires the
-m32 flag and additional libraries for 32 bit mode.
Currently, my Python code calls Silva's code and the LMO code from the
command line using the subprocess module.
Kevin Stueve
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7013#comment:5>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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