Memory

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Gregory Vernon le 18 Fév 2012

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Modifié(e) : Image Analyst le 16 Oct 2013

Can anyone explain this? feature memstats

Physical Memory (RAM):
      In Use:                             2493 MB (   9bd51000)
      Free:                               1485 MB (   5cdeb000)
      Total:                              3979 MB (   f8b3c000)
  Page File (Swap space):
      In Use:                             3313 MB (   cf1c1000)
      Free:                               4642 MB (  1222e9000)
      Total:                              7956 MB (  1f14aa000)
  Virtual Memory (Address Space):
      In Use:                             1834 MB (   72ae8000)
      Free:                            8386772 MB (7ff8d4f8000)
      Total:                           8388607 MB (7fffffe0000)
  Largest Contiguous Free Blocks:
 ----->1. [at   18000b000]      -----> 8376280 MB (7fcfd8d5000) 
       2. [at 7feff241000]                4107 MB (  100bff000)
       3. [at    a4510000]                2488 MB (   9b870000)
       4. [at 7fe7d902000]                1848 MB (   7384e000)
       5. [at   13fda9000]                1026 MB (   40257000)
       6. [at    982c0000]                 130 MB (    8250000)
       7. [at    15000000]                 130 MB (    8210000)
       8. [at    29430000]                  66 MB (    4260000)
       9. [at    213a0000]                  64 MB (    4090000)
      10. [at    11360000]                  60 MB (    3c20000)
                                          ======= ==========
                            ---------> 8386203 MB (7ff69b59000)

I've got a laptop with a 500 GB HD and 4 GB of ram. Why does Matlab say I've got 8 Terabytes of contiguous memory?

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James Tursa le 18 Fév 2012

What version of MATLAB and Operating System?

Gregory Vernon le 27 Fév 2012

MATLAB Version 7.13.0.564 (R2011b)

Operating System: Microsoft Windows 7 Version 6.1 (Build 7601: Service Pack 1)

Java VM Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode

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Answer 1

Jiro Doke le 18 Fév 2012

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https://fr.mathworks.com/matlabcentral/answers/29496-memory#answer_37872

That's the theoretical limit that MATLAB can access on your 64-bit system, which is independent of how much RAM and Swap you have. The actual limit is the "Swap Space" shown above - 4642 MB free.

In case you're not aware of these, there are a few tech notes on memory and MATLAB that you might find useful. This one is a good start.