Why does it show negative number of MemUse?
Interpreting xhprof results - why yield negative values of MemUse?
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Functions can release more memory than they allocate. (Note: a function can release memory allocated else where.)
For example, consider a function
a()
which callsb()
. Say,b()
allocates a string or array and returns it toa()
which then uses it locally and thena()
completes. In this case,b()
's memory allocation will be+ve
, whereasa()
's net memory allocation will be-ve()
(because it was responsible for free'ing memory allocated inb()
).