Difference: FileSummaryRecord (5 vs. 6)

Revision 62014-04-01 - RobLambert

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META TOPICPARENT name="LHCbComputing"

LHCb File Summary Record

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  • If 8 of them are stored to a file as a tree with only 2 bifurcations at each branch, instead of storing 8*2 packed ints we are now storing
    • Size on file: 1+2+4+8 * (string + pointer + container + root-specific-rubbish ) + 8*2 packed ints
    • Size in memory: 1+2+4+8 * (string + pointer + container + root-specific-rubbish + bucket + cache) + 8*2 packed ints
Added:
>
>
    • Note that the root-specific-rubbish + bucket + cache is likely to be of order 10kB and so is vastly bigger than the size of the two packed ints.
 
  • The deeper the tree and the broader the tree, the exponentially more memory is required to store these objects.
 
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