Re: Memory usage - Extract vs Select
- To: mathgroup at smc.vnet.net
- Subject: [mg93217] Re: Memory usage - Extract vs Select
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Fri, 31 Oct 2008 03:07:29 -0500 (EST)
On 10/30/08 at 2:03 AM, tomfabtastic at hotmail.com wrote: >Also, is there a way to tell how much memory is being used by a >mathematica command ? No. Nor can there be in general. The amount of memory a given command needs for intermediate steps will often depend on specifics of the arguments it has to act on. For example, consider just plotting a function. Since Mathematica samples the function more where it bends, very non-linear functions will require more memory than linear functions. There are ways to determine how much memory is used to store an expression or how much memory is used by any sequence of commands after they have completed. ByteCount gives the number of bytes needed to store a particular expression. MemoryInUse gives the amount of memory in use at the time this command is executed. Obviously changes in the value returned by MemoryInUse are the amount of memory consumed by operations done between uses of MemoryInUse.