stringdups man page on Darwin

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stringdups(1)		  BSD General Commands Manual		 stringdups(1)

     stringdups — Identify duplicate strings or other objects in malloc blocks
     of a target process

     stringdups [-minimumCount count] [-stringsOnly] [-nostacks] [-callTrees]
		[-invertCallTrees] pid | partial-executable-name

     stringdups examines the content of malloc blocks in the specified target
     process.  For all blocks which have the same content, it shows a line
     with the number of such blocks, their total allocated size (the total
     size in the malloc heap, not just the specific size of their content),
     and the average allocated size.

     If the MallocStackLogging environment variable was set when the target
     process was launched, stringdups also displays stack backtraces or call
     trees showing where all the blocks with a particular grouping of content
     were allocated.

     stringdups gathers the content of blocks of various types including:

     ·	 C strings (composed of UTF8 characters, null terminated, of any
     ·	 Pascal strings (composed of UTF8 characters with length byte at
	 start, no longer than 255 characters, not necessarily null termi‐
     ·	 NSString of all types (immutable, mutable, UTF8, Unicode).  Malloc
	 blocks which are the storage blocks for non-inline or mutable
	 NSString's are listed separately.  The string content is shown for
	 both but the block sizes accurately show what is allocated in the
	 malloc heap for that particular chunk of storage.
     ·	 NSDate
     ·	 NSNumber
     ·	 NSPathStore2  (Cocoa's representation of file paths)
     ·	 item counts for collection classes such as NSArray, NSSet, and NSDic‐

     -minimumCount count  Only print information for object descriptions which
			  appear at least count times in the target process.
			  The default minimum count is 2.  To see all strings
			  in the target process, use 1 or use 'heap <pid>
			  -addresses all'.

     -stringsOnly	  Only print information for objects that have string
			  content such as C or Pascal strings, or NSString.

     -nostacks		  Do not print stack backtraces or call trees even if
			  the target process has the MallocStackLogging envi‐
			  ronment variable set.

     -callTrees		  If stack bactraces are available, then by default
			  all the object descriptions for a particular stack
			  backtrace are consolidated together.	However if
			  this argument is passed then the output is consoli‐
			  dated by each particular string and a call tree is
			  displayed showing the allocation backtraces of all
			  occurrences of objects with that description.	 This
			  output can be very lengthy if minimumCount is a low
			  value, because the same call tree may be displayed
			  many times.

     -invertCallTrees	  Same as except that the call trees are printed from
			  hottest to coldest stack frame, so the leaf malloc
			  call appears first.

     heap(1), leaks(1), malloc_history(1), vmmap(1), DevToolsSecurity(1)

BSD				 July 21, 2011				   BSD

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