On 2009-Mar-29 11:55:48 -0700, Ondrej Certik ond...@certik.cz wrote:
I think I will just add more targets to the makefile in the top
directory, e.g. something like
make # use 1 processor
make parallel # use all processors
JOBS=3 make # use 3 processors
FWIW, FreeBSD has just implemented
Hi Roman,
On Sat, Mar 28, 2009 at 4:40 PM, Roman Pearce rpear...@gmail.com wrote:
/* Linux */
#include sched.h
int sched_getaffinity(pid_t pid, unsigned int cpusetsize, cpu_set_t
*mask);
static inline int num_processors()
{
unsigned int bit;
int np;
cpu_set_t aff;
Hi Elliott,
On Sat, Mar 28, 2009 at 3:59 PM, Elliott elliottbross...@gmail.com wrote:
If the user has Java installed, you could execute a .class file to get
this information; for example:
public class NumProcessors {
public static void main(String[] args) {
On 2009-Mar-28 14:53:46 -0700, Ondrej Certik ond...@certik.cz wrote:
I am trying to figure out the best way to automatically determine the
number of processors and used that information to speed up Sage build.
Note that this should be able to be over-ridden by the operator -
just because a system
On Sun, Mar 29, 2009 at 11:34 AM, Peter Jeremy
peterjer...@optushome.com.au wrote:
On 2009-Mar-28 14:53:46 -0700, Ondrej Certik ond...@certik.cz wrote:
I am trying to figure out the best way to automatically determine the
number of processors and used that information to speed up Sage build.
On Sun, Mar 29, 2009 at 11:34 AM, Peter Jeremy
peterjer...@optushome.com.au wrote:
On 2009-Mar-28 14:53:46 -0700, Ondrej Certik ond...@certik.cz wrote:
I am trying to figure out the best way to automatically determine the
number of processors and used that information to speed up Sage build.
On Mar 29, 12:49 am, Ondrej Certik ond...@certik.cz wrote:
I just tried the following code on several linuxes (Debian, Ubuntu,
Gentoo, Red Hat, OpenSUSE) and on OS X 10.5 Intel and it seems to just
work everywhere:
#include unistd.h
#include stdio.h
int main()
{
int ncpus;
3) if it doesn't build, we are on Mac probably, so run sysctl -n
hw.ncpu (I don't have any Mac to test it on, but I guess there
might be a way to actually write the C program in a portable way to
work both on linux and Mac)
So according to this thread:
If the user has Java installed, you could execute a .class file to get
this information; for example:
public class NumProcessors {
public static void main(String[] args) {
System.out.println(Runtime.getRuntime().availableProcessors());
}
}
If you compiled this and put the resulting
/* Linux */
#include sched.h
int sched_getaffinity(pid_t pid, unsigned int cpusetsize, cpu_set_t
*mask);
static inline int num_processors()
{
unsigned int bit;
int np;
cpu_set_t aff;
memset(aff, 0, sizeof(aff) );
sched_getaffinity(0, sizeof(aff), aff );
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