Hi,
What OS are you on? Cygwin? Apparently every OS reports memory size
in a different way:
http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=lib/physmem.c;h=2629936146e3042f927523322f18aca76996cd7f;hb=HEAD
The good news is that the above code is LGPLv2:
http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=blob;f=modules/physmem;h=9644522e0493a85a9fb4ae7c4449741c2c1500ea;hb=HEAD
But currently I'm just using this short function that will fail on some
platforms:
uint64_t GuessPhysicalMemory() {
#if defined(_WIN32) || defined(_WIN64)
return 0;
#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
long pages = sysconf(_SC_PHYS_PAGES);
if (pages == -1) return 0;
long page_size = sysconf(_SC_PAGESIZE);
if (page_size == -1) return 0;
return static_cast<uint64_t>(pages) * static_cast<uint64_t>(page_size);
#else
return 0;
#endif
}
If it fails, I just don't let users specify memory as a percentage. So
one thing thing to fix is putting physmem.{h,c} in util then changing
calls to GuessPhysicalMemory. But I'm also not a fan of the way the GNU
code gives up and makes up a number at the end.
The second porting issue is that lmplz makes parallel use of pread,
pwrite, and write. Windows is unsafe in this regard (POSIX requires
that pread/pwrite not change the file pointer; Windows has no way to
implement that atomically). To fix this, we'll always specify the file
offset in cases that happen concurrently. Extend util/stream/io.* with
a PWrite class based on PWriteOrThrow then change FileBuffer to use
PWrite. Then I guess one should rename PReadOrThrow/PWriteOrThrow to
something that indicates they're not-quite-POSIX on windows. Also, the
macros in these functions should detect cygwin, bypassing cygwin's
"Function not implemented" and calling Windows APIs directly (they're
already there for _WIN32).
I don't have a windows box so I can say what should be changed at a high
level, but need an actual user to ensure it compiles and runs correctly.
Kenneth
On 11/22/13 06:49, Prasanth K wrote:
> Hi,
>
> I am trying to use KenLM for building a language model on the Europarl
> corpus. Following the instructions in
> (http://www.statmt.org/moses/?n=FactoredTraining.BuildingLanguageModel#ntoc19),
> I added the few lines for getting KenLM to estimate the LM probabilities
> (order/n=5) to my config file to the EMS. The language model dies down
> during training saying that the "Function not implemented" at counting
> and sorting n-grams stage (the first stage itself). Does this mean there
> is something wrong with my installation? Or is just insufficient memory?
>
> Incidentally, when I started giving the amount of memory in terms of %
> (80%) there was an error "Failed to parse .. into memory size because
> physical memory size could not be determined". I am also curious why
> this happens?
>
> Kenneth, can you shed some light on this? Thanks.
>
> - Regards,
> Prasanth
>
>
>
> --
> "Theories have four stages of acceptance. i) this is worthless nonsense;
> ii) this is an interesting, but perverse, point of view, iii) this is
> true, but quite unimportant; iv) I always said so."
>
> --- J.B.S. Haldane
>
>
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>
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