Windows possible memory leak
- To: mathgroup at smc.vnet.net
- Subject: [mg120612] Windows possible memory leak
- From: "McHale, Paul" <Paul.McHale at excelitas.com>
- Date: Sun, 31 Jul 2011 07:24:56 -0400 (EDT)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
I wanted to compare rules based processing performance to Table[] based processing performance. The following code section assumes the data was read in and certain variables are set. I executed the same code about 10 times in a row to get the output formatted and the comments/coding the way I wanted to leave it. I don't believe this code creates more data every time it is executed. I could be wrong. I believe the first time it is run, variables are created. Each subsequent run overwrites the variables.
How do I end up with the "Out of memory" error? I should be able to "Shift-Enter" this all day long. I didn't lose anything. I just needed to reload certain data. It isn't just this code. It has happened many times before on other code. If I am doing something wrong, let me know so I can mend my ways :) Otherwise, I am inclined to believe there is some memory management (or setting?) issue. Running the same code over and over again should yield the same results (memory wise ;) )
(* Perform rule based processing *)
RuleStartTime=Date[];
mListRule=InData /. {AA_,BB_,CC_,DD_,EE_,FF_} -> {
{AA*mTimeCal,DD*mDivideBy*Calibration[[3]][[1]]+Calibration[[3]][[2]]},
{AA*mTimeCal,EE*mDivideBy*Calibration[[4]][[1]]+Calibration[[4]][[2]]},{AA*mTimeCal,FF*mDivideBy*Calibration[[5]][[1]]+Calibration[[5]][[2]]}};
RuleStopTime=Date[];
"Rule based processing time: "<> ToString @ DateDifference[RuleStartTime,RuleStopTime,"Second"]
(* Perform Table[] based processing *)
TableStartTime=Date[];
mData=Table[
{{InData[[i,1]]*mTimeCal,InData[[i,4]]*mDivideBy*Calibration[[3]][[1]]+Calibration[[3]][[2]]},{InData[[i,1]]*mTimeCal,InData[[i,5]]*mDivideBy*Calibration[[4]][[1]]+Calibration[[4]][[2]]},{InData[[i,1]]*mTimeCal,InData[[i,6]]*mDivideBy*Calibration[[5]][[1]]+Calibration[[5]][[2]]}},
{i,1,Length[InData]}
];
TableStopTime=Date[];
"Table based processing time: "<> ToString @ DateDifference[TableStartTime,TableStopTime,"Second"]
(* Compare the two results *)
"Comnparing the two results mListRule == mData -> " <> ToString @ (mListRule== mData)
Rule based processing time: {3.01541, Second}
Table based processing time: {1.29678, Second}
Comnparing the two results mListRule == mData -> True
Thanks,
Paul
Paul McHale | Electrical Engineer, Energetics Systems | Excelitas Technologies Corp.
Phone: +1 937.865.3004 | Fax: +1 937.865.5170 | Mobile: +1 937.371.2828
1100 Vanguard Blvd, Miamisburg, Ohio 45342-0312 USA
Paul.McHale at Excelitas.com<mailto:Paul.McHale at perkinelmer.com>
www.excelitas.com<http://www.excelitas.com>
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