PGI Frequently Asked Questions
Questions and answers to many common issues and concerns.
Most of the problems reported by users have been encountered and solved before, or reflect a common misconception. This page lists problems and questions we have run into with the PGI® products, along with suggested solutions or workarounds.
- Current Release Questions
- Installation and Licensing Questions and Problems
- Compilation Questions and Problems
- Linking Questions and Problems
- Execution Questions and Problems
- Portability Questions
- Inter-Language Questions and Problems
- PGI Tools Questions
- MPI Questions
A word about coding programs in a portable manner: Programs last much longer than anyone plans, especially if they work well. So it's a good idea to write them in a fashion that makes them independent of the machine or the compiler company you currently use. Often the response to a user's problem is that they are not coding in a portable fashion, because what they have done performs differently on different machines. Changing code now to remove platform/compiler dependencies can pay off in the long run.
Current Release Questions
- What new features are in the latest release?
- What are the latest releases?
- How do I get the latest release?
- What should I know about the latest releases?
- How do I find out if my license will work with the current release?
- How do I find out if I qualify for a current release license?
- What is a subscription?
- How does this release differ from the previous release?
- Any known problems with the current releases?
- What problems have been fixed in this release?
Installation and Licensing Questions and Problems
- Which releases of PGI compilers work with each Linux distribution?
- Which releases of PGI compilers work with each Windows version?
- Where can I get the PGI roll?
- What type of licenses are available?
- What is the hostid?
- What things can change the hostid?
- How do I know if the linux hostid has changed, and what should I do then?
- If the hostid has not changed and the license manager fails, what next?
- Okay, the simple things check out, what next?
- Who do I contact with license questions?
- Where can I find my PIN?
- How do I create/delete/move a license?
- Why can't I use my license server to serve more than one set of PGI license keys?
- How do I update libacml with newer versions?
- How do I use a Windows machine as a Floating License server?
- How do I use a Solaris machine as a floating license server?
- Can I check-out one of our network floating licenses to use on the road?
Compilation Questions and Problems
- I'm new to PGI. Which compiler flags should I be using?
- What are intrinsics and how do I call them directly?
- What should I be aware of when mixing pgi fortran with g77?
- How do I remove the 'FORTRAN STOP' message when 'STOP' is encountered?
- Compiler intermittently fails with SIG interrupt or bad output
- pgf77/pgf90 do not handle #include "file" statements properly.
- How do I easily call a compiler like 'pgcc' as 'cc'?
- The F90 SIZE intrinsic with 64-bit compilers does not handle large arrays properly
Linking Questions and Problems
- How do I fix a ": undefined reference to 'f__xargc'" problem?
- How do I solve the underscore problems?
- How do I tell the linker to ignore unresolved references?
- Can I use the MKL with PGI compilers and if so, how do I do it?
- How can I use the linux LIBRARY_PATH and LDFLAGS environment with the PGI compilers?
- Linker complains courbures.o(.text+0x2b2): undefined reference to 'sgelsy_'
- Linker complains ld: cannot open -lf2c: No such file or directory
- Linker complains ld: cannot open -lgcc:No such file or directory
- gnu ld version 2.9.5 causes multiple ref errors with -mp and -Mconcur
- PGHPF -- how do I direct the linker to a different mpi library?
- How do I generate a link map from your compilers?
- The linker complains about missing symbols ___rouent2, ___rouret2, and ___linent2
- When I try to create a Windows DLL as in the User's Guide, I get 'cannot find -lgcc' message.
- Where is libpgthread.so in Red Hat 8.0?
- The linker complains about the missing symbol __ctype_b?
- The linker complains about missing symbols like __mth_i_aintx, __mth_i_rpowix, etc.
- The linker complains about unresolved external symbols when linking with -lacml on Windows.
Execution Questions and Problems
- Precision problems.
- How come we get different answers on one platform versus a linux x86 platform?
- When I execute, I get 'libpgc.so: cannot open shared object file'?roo
- Do you have an example of using -byteswapio?
- Do you have any relative performance numbers?
- Does the license manager allow me to execute on other platforms?
- read(9,rec=recnr,end=100,err=101,iostat=ios) acts different on other compilers
- I have over 2GB of memory, but your compiled code can't handle even half of it?
- When executing with -heapz set, why do I get a '0: mmap: Not enough space' error in PGHPF?
- When executing, why do I get a stack overflow on Windows NT.
- When I compile with -Ktrap=inexact, why does the program get so many exceptions?
- When I compile with -Mvect=sse or -Mvect=prefetch, why do I get 'illegal instruction' exceptions when I run the program?
- Linux 2.4 kernel supports > 2GB files - does pgf77/f90 support them?
- Why does date_and_time(DATE) return 20 for the century?
- I declared all my variables as 'REAL*8', yet I get different answers with '-r8' set. Why is that?
Portability Questions
- What is the Linux Portability Package?
- Who needs the Portability Package?
- What do you mean by portability?
- Will every program I build run everywhere?
- What Linux versions have you tried out?
- How do I install the portability package?
- Are there licensing issues with the portability package?
- What else should developers consider for portability?
- How do I run a PGI developed program on a Windows machine without PGI compilers installed?
Inter-Language Questions and Problems
- How do you call pgf77-pgf90-pghpf routines from g++?
- what arguments can be passed from C++ to f90?
- How do you pass data between f77 and C/C++ routines.?
- How do you pass string data from HPF to an external C function?
- How do you pass data between f77 and f90?
- How about an example of hpf calling every type language routine?
- NT Visual C++ Interfacing
PGI Tools Questions
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Debugging with PGDBG
- What should I know about debugging unified binaries?
- When I compile using -g and -Mconcur, line number information appears to be missing for non-parallelized functions like "main". Is this to be expected?
- I am seeing messages printed to the Program I/O window of the PGDBG GUI that do not originate from my program.
- I am not able to call a Fortran subroutine/function.
- I am having trouble getting F90 module information in pgdbg.
- When I recompile my program, the source window of the GUI shows the old program source.
- How do you start pgdbg with a startup file?
- Can I read the SSE XMM registers from pgdbg?
- My program is taking a relatively long amount of time to execute under the control of the debugger.
- Why doesn't the debugger always single step over Windows system calls?
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Debugging MPI Applications with PGDBG
- How do I invoke PGDBG to debug my MPI program?
- Are there restrictions on what types of MPI applications PGDBG can debug?
- What do I have to do to my custom MPI distribution to make it work with PGDBG?
- What does PGDBG do differently when the MPIRUN -nolocal option is used?
- How do I use a script file with PGDBG when it is invoked with MPIRUN?
- Why do I not see output written to standard output by some of my MPI processes?
- The debugger adds double quotes around the command line program arguments to my MPI program.
- Using SSH (secure shell) as PGDBG's interprocess communication mechanism.
- Why does PGDBG fail to attach to processes in my MPI application?
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Debugging OpenMP and Multi-Threaded Applications with PGDBG
- I cannot access OpenMP private variables while using PGDBG to debug my Fortran program.
- I cannot access OpenMP private variables while using PGDBG to debug my C program.
- Why does PGDBG show that all my OpenMP threads are killed during execution?
- Why does PGDBG show that my OpenMP/MPI application receives SIGHUP?
- The threads of my program appear to block forever (hang) in a system call.
- What do you mean by PGDBG OpenMP event handling?
- Profiling with PGPROF: (5.2 and later)
- Profiling with PGPROF: (5.1 and earlier)
MPI Questions
- mpirun -np 4 results in the master node and not all the slave nodes running
- How do I use my own version of mpi libs with pghpf?
- Could you go through the steps to build MPICH 1.2.0?
- What configuration does PGI use to build MPICH 1.2.1, 1.2.2, 1.2.3, 1.2.4, 1.2.5, and 1.2.6?
- What configs do you use for MPICH 1.2.7?