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POEINVAL with gpfs_fcntl
 

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  1. POEINVAL with gpfs_fcntl
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    <p>I'm trying to use prefetching hints on an IO-heavy code. I set up the code according to my understanding of the man page of gpfs_fcntl(), but do get an EINVAL. I'm a bit lost now what I'm doing wrong - any hints are appreciated.</p> <p>Mount: <code>/dev/scratch16 on /bgscratch type gpfs (rw,dev=cadmos-gss.gss1a:scratch16,ldev=scratch16)</code></p> <pre><code>Error: Prefetch using gpfs_fcntl failed: Invalid argument (22), 32768b at 7713095680 from /bgscratch/foo.dat </code></pre> <p>File: <code>-rw-rw-r-- 1 delalond bbp 14739308544 Jul 25 2012 /bgscratch/foo.dat</code></p> <p>Source:</p> <pre><code>void BufferedFile::prefetch( const uint64_t offset, const uint64_t size ) { if( file_.fd == -1 ) file_.fd = ::open( filename.c_str(), O_RDONLY ); if( file_.fd == -1 ) { LBWARN &lt;&lt; "open() failed: " &lt;&lt; lunchbox::sysError &lt;&lt; std::endl; return; } struct { gpfsFcntlHeader_t hdr; gpfsAccessRange_t acc; } arg; arg.hdr.totalLength = sizeof(arg); arg.hdr.fcntlVersion = GPFS_FCNTL_CURRENT_VERSION; arg.hdr.fcntlReserved = 0; arg.acc.structLen = sizeof(arg.acc); arg.acc.structType = GPFS_ACCESS_RANGE; arg.acc.start = offset; arg.acc.length = size; arg.acc.isWrite = 0; if( gpfs_fcntl( file_.fd, &amp;arg ) != 0 ) LBWARN &lt;&lt; "Prefetch using gpfs_fcntl failed: " &lt;&lt; lunchbox::sysError &lt;&lt; ", " &lt;&lt; size &lt;&lt; "b at " &lt;&lt; offset &lt;&lt; " from " &lt;&lt; filename &lt;&lt; std::endl; } </code></pre> <p>Edit: I could reproduce the problem in a standalone application, and the error happens once start in greater than 4GB, even though it is a long long and a 64 bit system.</p>
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      1. POEINVAL with gpfs_fcntl
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    2. VO
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    1. COyou should add the language tag so more people will see it. wasn't sure if it was c or c++ so i didn't added any
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    2. CODid you initialize file_.fd to -1 ?
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      1. USAdrian Panasiuk
    3. COYes, fd is initialized to -1 in the constructor.
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      1. POEINVAL with gpfs_fcntl
      1. USeile
 

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