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* [Bug java/58669] New: does not detect all cpu cores/threads
@ 2013-10-09 15:54 folkert at vanheusden dot com
2013-10-09 16:27 ` [Bug java/58669] " gnu_andrew at member dot fsf.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: folkert at vanheusden dot com @ 2013-10-09 15:54 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
Bug ID: 58669
Summary: does not detect all cpu cores/threads
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: java
Assignee: unassigned at gcc dot gnu.org
Reporter: folkert at vanheusden dot com
Created attachment 30970
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30970&action=edit
example code
When a java program compiled with gcj asks how many processing units are in the
system, it always returns 1.
folkert@belle:~$ cat test2.java
class test2 {
public static void main(String [] args) {
System.out.println("" +
Runtime.getRuntime().availableProcessors());
}
}
folkert@belle:~$ javac test2.java
folkert@belle:~$ java test2
12
folkert@belle:~$ gcj --main=test2 test2.java
folkert@belle:~$ ./a.out
1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/58669] does not detect all cpu cores/threads
2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
@ 2013-10-09 16:27 ` gnu_andrew at member dot fsf.org
2013-10-09 16:35 ` gnu_andrew at member dot fsf.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: gnu_andrew at member dot fsf.org @ 2013-10-09 16:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
Andrew John Hughes <gnu_andrew at member dot fsf.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-10-09
CC| |gnu_andrew at member dot fsf.org
Ever confirmed|0 |1
--- Comment #1 from Andrew John Hughes <gnu_andrew at member dot fsf.org> ---
jint
java::lang::Runtime::availableProcessors (void)
{
// FIXME: find the real value.
return 1;
}
:)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/58669] does not detect all cpu cores/threads
2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
2013-10-09 16:27 ` [Bug java/58669] " gnu_andrew at member dot fsf.org
@ 2013-10-09 16:35 ` gnu_andrew at member dot fsf.org
2013-10-09 16:36 ` folkert at vanheusden dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: gnu_andrew at member dot fsf.org @ 2013-10-09 16:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
--- Comment #2 from Andrew John Hughes <gnu_andrew at member dot fsf.org> ---
This is easily fixed with sysconf(_SC_NPROCESSORS_ONLN);
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/58669] does not detect all cpu cores/threads
2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
2013-10-09 16:27 ` [Bug java/58669] " gnu_andrew at member dot fsf.org
2013-10-09 16:35 ` gnu_andrew at member dot fsf.org
@ 2013-10-09 16:36 ` folkert at vanheusden dot com
2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: folkert at vanheusden dot com @ 2013-10-09 16:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
--- Comment #3 from Folkert van Heusden <folkert at vanheusden dot com> ---
Did some googling and with appropriate #ifdefs it should be at least on linux
possible to retrieve this value:
sysconf(_SC_NPROCESSORS_ONLN);
If that function can't figure it out, it will return '1' which is somewhat
sensible.
On
http://stackoverflow.com/questions/150355/programmatically-find-the-number-of-cores-on-a-machine
I found a whole list of implementations for windows, *bsd, macos, aix, well I
think all relevant platforms.
Also
http://stackoverflow.com/questions/4586405/get-number-of-cpus-in-linux-using-c
gives some ideas.
If there's any further help I can do; let me know.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/58669] does not detect all cpu cores/threads
2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
` (3 preceding siblings ...)
2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
@ 2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
2013-10-18 1:17 ` gnu_andrew at member dot fsf.org
5 siblings, 0 replies; 7+ messages in thread
From: gnu_andrew at member dot fsf.org @ 2013-10-09 18:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
--- Comment #5 from Andrew John Hughes <gnu_andrew at member dot fsf.org> ---
Thanks for reporting this. I'll let you know when a fix is committed.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/58669] does not detect all cpu cores/threads
2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
` (2 preceding siblings ...)
2013-10-09 16:36 ` folkert at vanheusden dot com
@ 2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
2013-10-18 1:17 ` gnu_andrew at member dot fsf.org
5 siblings, 0 replies; 7+ messages in thread
From: gnu_andrew at member dot fsf.org @ 2013-10-09 18:36 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
--- Comment #4 from Andrew John Hughes <gnu_andrew at member dot fsf.org> ---
Yes, I just said that above. I'll propose a patch when I get chance.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug java/58669] does not detect all cpu cores/threads
2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
` (4 preceding siblings ...)
2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
@ 2013-10-18 1:17 ` gnu_andrew at member dot fsf.org
5 siblings, 0 replies; 7+ messages in thread
From: gnu_andrew at member dot fsf.org @ 2013-10-18 1:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58669
Andrew John Hughes <gnu_andrew at member dot fsf.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |gnu_andrew at member dot fsf.org
--- Comment #6 from Andrew John Hughes <gnu_andrew at member dot fsf.org> ---
http://gcc.gnu.org/ml/java-patches/2013-q4/msg00000.html
^ permalink raw reply [flat|nested] 7+ messages in thread
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2013-10-09 15:54 [Bug java/58669] New: does not detect all cpu cores/threads folkert at vanheusden dot com
2013-10-09 16:27 ` [Bug java/58669] " gnu_andrew at member dot fsf.org
2013-10-09 16:35 ` gnu_andrew at member dot fsf.org
2013-10-09 16:36 ` folkert at vanheusden dot com
2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
2013-10-09 18:36 ` gnu_andrew at member dot fsf.org
2013-10-18 1:17 ` gnu_andrew at member dot fsf.org
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