It's normal for idle places to use CPU - it's constantly checking the
network for incoming messages. This helps reduce latency when data comes
in from a remote place, but this background checking may be the cause of
the slowdown you see. You may want to see if you get better performance
with the default "sockets" backend.
- Ben
|------------>
| From: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Kirak Hong <hok...@gatech.edu>
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| To: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|Mailing list for users of the X10 programming language
<x10-users@lists.sourceforge.net>
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Date: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|12/20/2010 03:19 PM
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|------------>
| Subject: |
|------------>
>--------------------------------------------------------------------------------------------------------------------------------------------------|
|[X10-users] mpi slowdown
|
>--------------------------------------------------------------------------------------------------------------------------------------------------|
Hi,
I found that I get a huge slowdown when I use multiple nodes for mpirun
with
x10 application. Here are my simple code :
var count:int = 0;
while(true)
{
var t:Long = Timer.milliTime();
for(var i:int = 0; i < 10000000; i++);
Console.OUT.println("count : " + count + ",
elapsed time = " + (Timer.milliTime() - t));
count++;
}
And here are the results :
hok...@hokira-desktop:~/ext/Dropbox/Projects/x10/x10hello$ mpirun -n 1 Main
count : 0, elapsed time = 31
count : 1, elapsed time = 21
count : 2, elapsed time = 22
count : 3, elapsed time = 22
count : 4, elapsed time = 22
hok...@hokira-desktop:~/ext/Dropbox/Projects/x10/x10hello$ mpirun -n 8 Main
count : 0, elapsed time = 51
count : 1, elapsed time = 55
count : 2, elapsed time = 45
count : 3, elapsed time = 55
count : 4, elapsed time = 45
I can see the X10 runtime code but I want to make sure if I did some
mistake
while building or running the application.
Also, I saw CPU utilizations are 100% even when only one place is actually
running some work. Is this normal behavior of X10 application?
Thanks,
Kirak
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