[parsec-users] Errors running Parsec benchmarks in M5

ef snorlaxgb at gmail.com
Mon Aug 24 01:35:29 EDT 2009


Hello,
I went ahead and built a non-pthread version of Swaptions and it ran with no
seg fault at the end. SO the issue is with the pthread library.

So the following benchmarks have this issue:
Fluidanimate
Canneal
and Swaptions

DO any of these share any sort of property that would cause this issue?


I am not that good of a googler and I am stuck, nor am i that experienced:

What should I do next?
1 Re-Build the pthead library? If so how? I need a package to rebuld into a
static library..any links on this would be great as I cant find any (I suck
at googling)

2. Do I need to add extra linking options or flags? I tried -mt I thought
that should fix it, eithier I am doing this incorrectly or its not the
issue:
http://www.camden.rutgers.edu/HELP/Documentation/Sun-compiler-docs/WS6/manuals/c++/prog_guide/Multithread.html


Thanks
EF
2009/8/22 Christian Bienia <cbienia at cs.princeton.edu>

>  Hi Ef,
>
>
>
> I was mistaken concerning disabling error checking. I confused swaptions
> with blackscholes where error checking is optional.
>
>
>
> I have no idea why the programs crash at the end of main(). I’d guess it’s
> some sort of library issue, but I have no idea how to debug that.
>
>
>
> - Chris
>
>
>
>
>
> *From:* parsec-users-bounces at lists.cs.princeton.edu [mailto:
> parsec-users-bounces at lists.cs.princeton.edu] *On Behalf Of *ef
> *Sent:* Saturday, August 22, 2009 1:20 AM
>
> *To:* PARSEC Users
> *Subject:* Re: [parsec-users] Errors running Parsec benchmarks in M5
>
>
>
> Hello,
>
> The flush technique works it solved that problem. However now I am dealing
> wiith this issue:
> Swaptions now issues a segmentation fault on exit.
>
> Now i have two programs that seg fault upon exit of main. (Fluid Animate
> also)
>
> Im looking into:
>
> http://www.unix.com/high-level-programming/59634-c-segmentation-fault-exit-main-2.html
>
> That might be the issue. Do you have any ideas?
>
> Also you mentioned that I can disable error checking on swaptions? I
> glanced through the code I have no clue how to do that....Is it a flag or
> are you reffering to simply removing of the for loop that prints the std of
> error.
>
> Thanks
>
> EF
>
>
>
>  2009/8/21 Christian Bienia <cbienia at cs.princeton.edu>
>
> Ef,
>
>
>
> It might be that you only simulate until the program terminates and not any
> further. If your operating system uses asynchronous output by default then
> the text output created by the program is still in the buffer and has to be
> flushed. So it has been written but the OS hasn’t displayed it yet.
>
>
>
> To force the OS to flush all output buffers before the program exits simply
> insert an “fflush(NULL);” after the last printf statement. Chances are
> you’ll then see all output correctly.
>
>
>
> - Chris
>
>
>
> *From:* parsec-users-bounces at lists.cs.princeton.edu [mailto:
> parsec-users-bounces at lists.cs.princeton.edu] *On Behalf Of *ef
> *Sent:* Friday, August 21, 2009 9:52 PM
>
> *To:* PARSEC Users
> *Subject:* Re: [parsec-users] Errors running Parsec benchmarks in M5
>
>
>
> Hello,
>
> Sorry for the confusion:
> The difficulty with facesim is that I am running using M5, therefore in my
> disk images need to supply a rcs file. It would of been easier and more
> flexible if I can specify the input and output directory like the other
> parsec benchmarks. But I can still manage.
>
>
>
> As for swaptions there is an error, sorry for the lack of clarity:
> There should be 16 swaptions but this is the exact output:
>
> PARSEC Benchmark Suite Version 2.1
> Number of Simulations: 5000,  Number of threads: 4 Number of swaptions: 16
> Swaption0: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption1: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption2: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption3: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption4: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption5: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption6: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption7: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swa
>
>
> Not sure whats going on here....The program exit while typing "Swa". Very
> strange.
>
>
> Thanks
> EF
>
> 2009/8/21 Christian Bienia <cbienia at cs.princeton.edu>
>
> Ef,
>
>
>
> If I remember correctly facesim automatically reads and writes all inputs
> and outputs relative to the current directory. So simply run the program
> from whatever directory you want to use. Parsecmgmt does that automatically
> for you.
>
>
>
> The output of blackscholes looks good, the errors are about what you can be
> expected from varying floating-point implementations. Don’t worry about ti.
> It’s normal that fp output varies a little on different outputs because fp
> calculations have to round numbers. You can account for that by making a
> comparison within a certain tolerance (target value +/- epsilon). Don’t
> forget to disable error checking for the final workload binary, it’s not
> supposed to be included for performance measurements.
>
>
>
> - Chris
>
>
>
>
>
> *From:* parsec-users-bounces at lists.cs.princeton.edu [mailto:
> parsec-users-bounces at lists.cs.princeton.edu] *On Behalf Of *ef
> *Sent:* Friday, August 21, 2009 7:00 PM
>
>
> *To:* PARSEC Users
> *Subject:* Re: [parsec-users] Errors running Parsec benchmarks in M5
>
>
>
> Hello,
>
>
>
> For facesim the error was silly, the issue is it was looking in the wrong
> path for input, from what I can tell you CANNOT set the input directory, do
> you know how?
>
>
>
>
> For swaptions I fixed " the unaligned access error" by linking to different
> libs which also removed the seg fault. However I am stuck here:
>
> PARSEC Benchmark Suite Version 2.1
> Number of Simulations: 5000,  Number of threads: 4 Number of swaptions: 16
> Swaption0: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption1: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption2: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption3: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption4: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption5: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption6: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swaption7: [SwaptionPrice: 0.0000234735 StdError: 0.0000083599]
> Swa
>
> Thats exactly what happens, I have no clue whats going on.
>
> Thanks
> EF
>
>
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