In this demo I merge two 0.5 GB files (2GB, 2.5GB and 3GB, 3.6GB test at the bottom of this page). It takes only three minutes. Clock shows 4 minutes but I wasted more than a minute for snap shots in between.
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If you are receiving "Map Failed" exception, then please increase your java heap as explained (please click) here.
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Update on Windows 8 Pro (End December 2012):
I put seven copies of a half (0.5) GB pdf document together with pdfadvancedSB672 JAR file in the same directory.
I run the "JAR" file.
I click on "Merge Files" button. After just one minute I get the result:
Result file is 3.5 GB.
CPU temperature for few seconds increase as much as 6 oC from its base value. CPU usage never exceeded more than 40% in any thread.
Platform Used : ASUS P9X79 PRO, Intel Core i7-3820, 32 GB DDR3, Java memory during operation 4GB
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Older Experiments on Windows XP and Windows 7
First file is 490125 KB:
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Second file is 560918 KB:
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Please look at the clock:
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Now, please look at the clock at the termination of merging:
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I move horizontal slider to see file names:
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CPU usage (saving resources for merging I did not snap shot the CPU usage graph) never exceeds 50 % - 60 % Have a look at the CPU (a Prescott!) temperature immediately after job done, please:
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And here we are, the merged file is bigger than 1GB (200,000 of ordinary pages):
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Now I have done a new test that has pushed up the limit to 1.5GB, 2GB, 2.5GB, and 3GB
I put three copies of the same document. I did not do different tests, e.g., 1GB and 0.5Gb or other scenarios. (Update,25/Oct/2011: Successfully, I checked any scenario including one 1.5GB and one 0.5GB total 2GB on W7, 64 bits with 8GB ddr3 FSB 1333MHz. I also checked on Windows 8 Preview, 64bits. I assigned 3072 MB for Java memory. Snapshots underway) Documents were high resolution 600dpi scans of written documents. the time it took was almost three minutes. I had W7, 32 bits recognizing 3.5GB of ddr3 ram with an Intel quad core 2.5GHz. All done in less than three minutes. Using Windows 8 Developers preview and 4096 MB for Java memory on the same rig, could push the limit to astonishing 3.6GB merged files out of two 1.8GB files, but it took 8 minutes. All scenarios are possible; however, you cannot participate a file more than 2GB in the scenario. JVM throws "size exceeds: Integer.MAX_VALUE" exception. Please have a look at the snapshot attached (please, click on the picture to watch a larger size in the browser). All those big files in the directory are created using Dysprosium Suite. PDF icon is not realised due to the fact that Adobe has not yet created software for Windows 8. Dysprosium rocks!
