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Originally posted by daya3957 at 2011-03-23 09:14:31:
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64-Bit Architectures

If you are using a 64-bit operating system in conjunction with a 64-bit version of MATLAB, it is theoretically possible to access approximately power(2,64) bytes of memory. This far exceeds the amount of memory available to any computer on the market today, so the amount of memory that is available to MATLAB will be limited by the amount of memory available on the computer. As this is typically related to the amount of available virtual memory (or swap space), you may want to consult Section 5 of this document. Note, however, that there is still a limit on the largest single array available in MATLAB. For more information about this topic, consult Solution 1-5193IK.

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memory
Maximum possible array:            1451 MB (1.521e+009 bytes) *    µ±Ç°ÏµÍ³Êý×éÄÜÕ¼µÄ×î´óÄÚ´æ
Memory available for all arrays:   1451 MB (1.521e+009 bytes) *    µ±Ç°ÏµÍ³±äÁ¿¿É±»·ÖÅäµÄ¿Õ¼ä
Memory used by MATLAB:              126 MB (1.320e+008 bytes)    ÒѾ­Ê¹ÓõÄÄÚ´æÊìÁ·
Physical Memory (RAM):             2038 MB (2.137e+009 bytes)     ÏµÍ³ÎïÀíÄÚ´æÊýÁ¿
* Limited by System Memory (physical + swap file) available. ´òÐǺűíʾÊÜÏÞÓÚϵͳÄÚ´æºÍ½»»»¿Õ¼äµÄ´óС

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2.²é¿´µ±Ç°JavaÐéÄâ»ú×î´ó¶ÑÄÚ´æ, ÇÃÈë:java.lang.Runtime.getRuntime.maxMemory

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The following table shows the default settings MATLAB uses for versions of the JVM:

JVM       Initial Heap Size     Max Heap Size
1.6.0     -Xms64m               -Xmx128m (32-bit)
                                             -Xmx196m (64-bit)
1.5.0     -Xms64m               -Xmx96m   (32-bit)
                                             -Xmx128m (64-bit)
1.4.2     -Xms16m               -Xmx96m
1.3.1     -Xms16000000         -Xmx64000000
1.2.2     -Xms16000000         -Xmx64000000
1.1.8     -ms16000000           -mx64000000

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