| View previous topic :: View next topic |
| Author |
Message |
tyler
Joined: 29 Jan 2005
Posts: 3
|
 Posted: Sat Jan 29, 2005 10:49 pm Post subject: IPA inhibited: no main routine |
 |
|
When I compile with -Mipa=fast I get this message after linking :
| Code: | | IPA inhibited: no main routine |
I use -c --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast when compiling my single files and also -Mipa=fast when linking. I have found no references to this problem on the web.
What does this mean and how do I fix it? |
|
| Back to top |
|
 |
mkcolg
Joined: 30 Jun 2004
Posts: 4996
Location: The Portland Group Inc.
|
| Posted: Mon Jan 31, 2005 11:38 am Post subject: |
|
|
Hi Tyler,
This error occurs when the main program was not compiled with IPA. Please double check that all your files were compiled using "-Mipa=fast".
If all your files were compiled with IPA, would it possible to send a complete log of your build to trs@pgroup.com? (I'm assuming it would be too long to be posted here.)
Thanks,
Mat |
|
| Back to top |
|
|
tyler
Joined: 29 Jan 2005
Posts: 3
|
| Posted: Mon Jan 31, 2005 2:45 pm Post subject: |
|
|
I do have a main in Main.cpp and it is compile with -Mipa=fast
here is the complete log of my build (it's not too long):
| Code: | pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/GA.o src/GA.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/KinematicModel.o src/KinematicModel.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/Main.o src/Main.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/NeuralConnections.o src/NeuralConnections.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/NeuralController.o src/NeuralController.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/NeuralPathways.o src/NeuralPathways.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/TGA.o src/TGA.cpp
pgCC -Iinclude --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -c -o obj/Unit.o src/Unit.cpp
linking ...
pgCC obj/GA.o obj/KinematicModel.o obj/Main.o obj/NeuralConnections.o obj/NeuralController.o obj/NeuralPathways.o obj/TGA.o obj/Unit.o --mp -fastsse -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -lrandomae -lrt -o bin/evolve
C++ prelinker: executing: /opt/pgi/linux86/5.2/bin/pgCC -Iinclude --mp -fastsse -fast -Mvect=sse -Mscalarsse -Mcache_align -Mflushz -O4 -tp=athlonxp -Minline=levels:10 -Mipa=fast -o obj/GA.o -c src/GA.cpp
IPA inhibited: no main routine |
here is Main.cpp:
| Code: | #include "GA.h"
#include "Utilities.h"
#include "Profiler.h"
int main()
{
RandomInit(RANDOM_SEED);
Profiler prof;
GA ga;
prof.Start();
ga.Start();
prof.End();
prof.PrintResult();
return 0;
} |
thanks for your time |
|
| Back to top |
|
|
mkcolg
Joined: 30 Jun 2004
Posts: 4996
Location: The Portland Group Inc.
|
| Posted: Tue Feb 01, 2005 12:53 pm Post subject: |
|
|
Hi Tyler,
Let's try some things to determine where the problem is. First "--mp" is a deprecated flag and shouldn't be used (Note, for openMP the flag is "-mp"). Try compiling without "--mp" to see if it is causing the problem. Next, try compiling with just "-O2 -Mipa=fast". If this works, then start adding back the other flags. Let me know at what point it starts to fail.
As a side note, I find IPA doesn't always help the performance of C++ code so you might be fine without it. Also, if you don't use exception handling, I find that adding "--no_exceptions" can help significantly.
Thanks,
Mat |
|
| Back to top |
|
|
tyler
Joined: 29 Jan 2005
Posts: 3
|
| Posted: Tue Feb 01, 2005 2:13 pm Post subject: |
|
|
I tried "-Mipa=fast -O2" and it still complained about duplicate symbols, but with just "-Mipa=fast" it worked, and as you said it gave me no performance gain. So far the best performance was obtained with "-mp -O4 -fastsse -tp=athlonxp -Minline=levels:10", almost doubling the execution speed (as compared to no optimization).
One last question: I tried the multi-threaded version of my program (with pthread, dual Athlon MP) and got these results:
-with gcc :
serial -> 41.67 sec
mt -> 23.91 sec (174%)
-with intel_cc :
serial -> 31.22 sec
mt -> 21.49 sec (145%)
-with pgCC :
serial -> 43.74 sec
mt -> 55.49 sec (79%)
why does the pgCC version drop in speed when I use my two processors (I checked and the mt version with pgCC does in fact max out my cpu usage to 99% on both cpus)?
thank you ,
David |
|
| Back to top |
|
|
|
Search
Memberlist
Register
Profile
Log in
