[mnet-devel] fec memory usage measured (new! with memory-freeing feature!)

[Zooko]

Yesterday I tested fecmodule's memory usage, then realized that I was using a 
locally-hacked version of fecmodule which had all of its "free()" and 
"DECREF()" calls commented out.

Those results were actually useful information, as it told us the total amount 
of memory that fecmodule allocates throughout its life, and that amount was 
reassuringly correct: not much more than 2 times the size of the file.

Here's today's edition, where I use the normal fecmodule.c from CVS, which 
includes calls to "free()" and "DECREF()" on things that it is finished using.

This is for running fectest with a sharesize of 16 MB.  The file sizes and 
memory amounts are all in bytes.  The memory is reported after all of the 
packets have been generated and then freed, so the only memory that is still 
in use is the mmap itself and some "overhead" stuff.  The results are just 
what we wanted to hear: as the file size increases, the memory usage gets 
close to 1 times the size of the file, which means no significant memory leaks.

--Z

   filesize  shares   mem usage  mem per size
   --------  ------   ---------  ------------
       4096       1    21327872      5207.000
       8192       1    21331968      2604.000
      16384       1    21340160      1302.500
      32768       1    21356544       651.750
      65536       1    21389312       326.375
     131072       1    21454848       163.688
     262144       1    21585920        82.344
     524288       1    21848064        41.672
    1048576       1    22372352        21.336
    2097152       1    23420928        11.168
    4194304       1    25518080         6.084
    8388608       1    29708288         3.542
   16777216       1    38100992         2.271
   33554432       4    54878208         1.635
   67108864       8    88428544         1.318
  134217728      16   155537408         1.159
  268435456      32   289759232         1.079



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