Difference between revisions of "FAQ: Understanding Memory"
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=== How do I allocate more memory for MIPAV? === | === How do I allocate more memory for MIPAV? === | ||
| − | + | 1 Select <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">Help > Memory Allocation</font>'''</span> in the MIPAV window. The Change Java.Runtime Memory Allocation dialog box (Figure 1) opens.<br /></font></div> | |
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| − | |+ | + | |+ '''Figure 1. Change Java.Runtime Memory Allocation dialog box''' |
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[[Image:dialogboxMemoryAllocation.jpg]] | [[Image:dialogboxMemoryAllocation.jpg]] | ||
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| − | + | 2 Change the Maximum heap size so that it reflects the maximum amount of desired memory to be allocated.<br />If additional memory is needed, MIPAV allocates it until the memory reaches the maximum heap size you entered.<br /> | |
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| − | + | The maximum heap size should not exceed the amount of RAM installed on the computer. For example, if the computer has 512 Kb of RAM, a good number for the maximum heap size is 450 Kb, which leaves some space for the operating system and other applications.<br /> | |
| + | 3 Click <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">OK</font>'''</span>. The Restart Needed message (Figure 2) appears.<br /> | ||
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| − | |+ | + | |+ '''Figure 2. Restart Needed message''' |
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[[Image:messageRestartNeeded.jpg]] | [[Image:messageRestartNeeded.jpg]] | ||
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| − | + | 4 Do one of the following:<br />To close and restart MIPAV immediately, click <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">Yes</font>'''</span>. MIPAV closes. In a moment, MIPAV starts again, and the memory changes take effect.<br />To postpone restarting MIPAV, click <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">No</font>'''</span>. The Restart Needed dialog box closes.<br /> | |
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| − | + | If you click <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">No</font>'''</span>, the memory settings for MIPAV do <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">not</font>'''</span> change. To make the settings take effect, you must close and restart MIPAV.<br /> | |
=== How much memory does MIPAV require to run? === | === How much memory does MIPAV require to run? === | ||
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MIPAV requires a base of at least 10 Mb of random access memory (RAM). However, to correctly display image files and to quantify the data, you need to allocate more memory, disk swap space, or install additional memory beyond this base. Each time MIPAV is installed, it always defaults to 100 Mb. | MIPAV requires a base of at least 10 Mb of random access memory (RAM). However, to correctly display image files and to quantify the data, you need to allocate more memory, disk swap space, or install additional memory beyond this base. Each time MIPAV is installed, it always defaults to 100 Mb. | ||
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| + | | [[Image:FAQMain.backup7.gif]] | ||
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=== What affects memory requirements? === | === What affects memory requirements? === | ||
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<div style="font-style: normal; margin-bottom: 6pt; margin-left: 0pt; margin-right: 0pt; margin-top: 14pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline">'''<font color="#000000"> To determine the amount of additional memory needed<br /></font>'''</div><div style="font-style: normal; font-weight: normal; margin-bottom: 14pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: -18pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 1 Multiply the size of the largest image file that you want to process by 10. <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 14pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: -18pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 2 Multiply the results by the number of image files that you want to display simultaneously.<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 14pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: -18pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 3 Add this amount to the 10-Mb base memory to result in the total amount of memory typically needed.`<br /></font></div> | <div style="font-style: normal; margin-bottom: 6pt; margin-left: 0pt; margin-right: 0pt; margin-top: 14pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline">'''<font color="#000000"> To determine the amount of additional memory needed<br /></font>'''</div><div style="font-style: normal; font-weight: normal; margin-bottom: 14pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: -18pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 1 Multiply the size of the largest image file that you want to process by 10. <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 14pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: -18pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 2 Multiply the results by the number of image files that you want to display simultaneously.<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 14pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: -18pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 3 Add this amount to the 10-Mb base memory to result in the total amount of memory typically needed.`<br /></font></div> | ||
| − | ==== | + | ==== Example 1 ==== |
If an image file is 2 Mb and you only want to display one image file at a time, you must allocate an additional 20 Mb of RAM to the base memory of 10 Mb to result in a memory requirement of 30 Mb. | If an image file is 2 Mb and you only want to display one image file at a time, you must allocate an additional 20 Mb of RAM to the base memory of 10 Mb to result in a memory requirement of 30 Mb. | ||
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<div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 2 Mb Size of image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> x 10 <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 20 Mb Memory required for displaying and processing 1 image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 10 Mb Base memory required for running MIPAV<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 30 Mb Total memory required<br /></font></div> | <div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 2 Mb Size of image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> x 10 <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 20 Mb Memory required for displaying and processing 1 image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 10 Mb Base memory required for running MIPAV<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 30 Mb Total memory required<br /></font></div> | ||
| − | ==== | + | ==== Example 2 ==== |
If the largest size image file is 2 Mb and you want to display 3 image files simultaneously, multiply 2 Mb by 10. Then multiply that sum by 3. Add that total to the base memory of 10 Mb to yield a memory requirement of 70 Mb. | If the largest size image file is 2 Mb and you want to display 3 image files simultaneously, multiply 2 Mb by 10. Then multiply that sum by 3. Add that total to the base memory of 10 Mb to yield a memory requirement of 70 Mb. | ||
| − | <div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 2 Mb Largest size image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> x 10 <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 20 Mb Memory required for displaying 1 image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> x 3 Number of images to display and process simultaneously<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 60 Mb Memory required to display 3 image files<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 10 Mb Base memory required for running MIPAV<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 70 Mb Total memory required<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-indent: 0pt; text-transform: none; vertical-align: baseline"><u><font color="#ff1621" | + | <div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 2 Mb Largest size image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> x 10 <br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 20 Mb Memory required for displaying 1 image file<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> x 3 Number of images to display and process simultaneously<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 60 Mb Memory required to display 3 image files<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 10 Mb Base memory required for running MIPAV<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> <nowiki>------</nowiki><br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 18pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-decoration: none; text-indent: 0pt; text-transform: none; vertical-align: baseline"><font color="#000000"> 70 Mb Total memory required<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-indent: 0pt; text-transform: none; vertical-align: baseline"><u><font color="#ff1621"> |
=== How do I determine how much memory is currently being used? === | === How do I determine how much memory is currently being used? === | ||
| − | In the MIPAV window, select <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">Help > Memory Usage</font>'''</span>. The Memory Monitor dialog box ( | + | In the MIPAV window, select <span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">Help > Memory Usage</font>'''</span>. The Memory Monitor dialog box (Figure 3]) appears. |
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| − | |+ | + | |+ '''Figure 3. Memory Monitor dialog box''' |
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[[Image:dialogboxMemoryMonitor.jpg]] | [[Image:dialogboxMemoryMonitor.jpg]] | ||
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| − | <br clear="all" /></font></span><span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">Note: </font>'''</span>You can leave this window open if you want to constantly monitor your memory resources.<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-indent: 0pt; text-transform: none; vertical-align: baseline"><u><font color="#ff1621" | + | <br clear="all" /></font></span><span style="font-style: normal; text-decoration: none; text-transform: none; vertical-align: baseline">'''<font color="#000000">Note: </font>'''</span>You can leave this window open if you want to constantly monitor your memory resources.<br /></font></div><div style="font-style: normal; font-weight: normal; margin-bottom: 0pt; margin-left: 0pt; margin-right: 0pt; margin-top: 0pt; text-align: left; text-indent: 0pt; text-transform: none; vertical-align: baseline"><u><font color="#ff1621"> |
=== How do I free memory? === | === How do I free memory? === | ||
Revision as of 16:15, 9 March 2012
Contents
How do I allocate more memory for MIPAV?
1 Select Help > Memory Allocation in the MIPAV window. The Change Java.Runtime Memory Allocation dialog box (Figure 1) opens.
</font></div>
2 Change the Maximum heap size so that it reflects the maximum amount of desired memory to be allocated.
If additional memory is needed, MIPAV allocates it until the memory reaches the maximum heap size you entered.
The maximum heap size should not exceed the amount of RAM installed on the computer. For example, if the computer has 512 Kb of RAM, a good number for the maximum heap size is 450 Kb, which leaves some space for the operating system and other applications.
3 Click OK. The Restart Needed message (Figure 2) appears.
4 Do one of the following:
To close and restart MIPAV immediately, click Yes. MIPAV closes. In a moment, MIPAV starts again, and the memory changes take effect.
To postpone restarting MIPAV, click No. The Restart Needed dialog box closes.
If you click No, the memory settings for MIPAV do not change. To make the settings take effect, you must close and restart MIPAV.
How much memory does MIPAV require to run?
MIPAV requires a base of at least 10 Mb of random access memory (RAM). However, to correctly display image files and to quantify the data, you need to allocate more memory, disk swap space, or install additional memory beyond this base. Each time MIPAV is installed, it always defaults to 100 Mb.
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What affects memory requirements?
Memory requirements fluctuate depending on the size and number of image files that are open at the same time. Factors affecting memory requirements are the following:
Size of image files: The physical size of image files (i.e., 1.2 Mb)
Number of image files opened: Working on more than one image file at the same time
{| align="left" | File:FAQMain.backup11.gif |}
Note: Java provides a method called Garbage Collector that clears all unnecessarily reserved memory. Generally, the software does this automatically, when free memory becomes very limited. However, you can run the Garbage Collector at any time to free memory (refer to [FAQMain.backup.html#1002914 "How do I free memory?" ]).
[FAQMain.backup.html#998290 File:FAQMain.backupa.gif ][FAQMain.backup.html#998290 Back to Questions]
How do I determine the amount of additional memory needed?
To determine the amount of additional memory needed
1 Multiply the size of the largest image file that you want to process by 10.
2 Multiply the results by the number of image files that you want to display simultaneously.
3 Add this amount to the 10-Mb base memory to result in the total amount of memory typically needed.`
Example 1
If an image file is 2 Mb and you only want to display one image file at a time, you must allocate an additional 20 Mb of RAM to the base memory of 10 Mb to result in a memory requirement of 30 Mb.
2 Mb Size of image file
x 10
------
20 Mb Memory required for displaying and processing 1 image file
10 Mb Base memory required for running MIPAV
------
30 Mb Total memory required
Example 2
If the largest size image file is 2 Mb and you want to display 3 image files simultaneously, multiply 2 Mb by 10. Then multiply that sum by 3. Add that total to the base memory of 10 Mb to yield a memory requirement of 70 Mb.
2 Mb Largest size image file
x 10
------
20 Mb Memory required for displaying 1 image file
x 3 Number of images to display and process simultaneously
------
60 Mb Memory required to display 3 image files
10 Mb Base memory required for running MIPAV
------
70 Mb Total memory required
How do I determine how much memory is currently being used?
In the MIPAV window, select Help > Memory Usage. The Memory Monitor dialog box (Figure 3]) appears.
The Memory Monitor dialog box shows how much memory is allocated and the amount of memory that is being used. The graph displays a pictorial representation of the ratio of allocated memory and amount of memory used. It shows the memory usage during the past 3 minutes and 45 seconds.
Note: You can leave this window open if you want to constantly monitor your memory resources.
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How do I free memory?
The Garbage Collector allows you to delete unnecessarily reserved memory. To free memory, do the following procedure periodically:
1 Select Help > Memory Usage in the MIPAV window. The Memory Monitor dialog box ([FAQMain.backup.html#1041395 Figure 3]) appears.
2 Click Free Memory. The system clears all unnecessarily reserved memory.
<u> [FAQMain.backup.html#998290 File:FAQMain.backup8.gif ][FAQMain.backup.html#998290 Back to Questions]
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