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MemoryInUse

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MemoryInUse[]
gives the number of bytes currently being used to store all data in the current Mathematica kernel session.

MemoryInUse[$FrontEnd]
gives the number of bytes used in the Mathematica front end.

Basic Examples (2)

Current memory use in the kernel:

Storing a million elements of t takes additional memory:

Current memory use in the front end:

Possible Issues (1)

MemoryConstrained MaxMemoryUsed ByteCount Share $HistoryLength

Memory Management

Mathematica Session Information

Mathematica Sessions

Memory Measurement & Optimization

Tuning & Debugging

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