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From "Michael Gerzabek" <michael.gerza...@gmx.net>
Subject Memory Leak in Cocoon 2.4.dev
Date Thu, 15 Jan 2004 17:18:28 GMT
I found now a testcase within cocoon standard distro that has exact the same
problems that I mentioned in my previous mails. It's the resource example in
the xsp block: http://localhost:8888/samples/xsp/java/resolver which
includes
content generated by an xsp in an xsp.

For those interested in redoing:
1) set your JAVA_OPTS to -Xms64M -Xmx64M
2) start cocoon with cocoon-servlet
3) execute the encluded anteater script (you will need ant-1.6 and 
   ant-contrib 0.6)

--| start anteater file
<?xml version="1.0" encoding="ISO-8859-1"?>
<project name="Cocoon Stress Test" default="main">
	<taskdef resource="META-INF/Anteater.tasks"/>
	<typedef resource="META-INF/Anteater.types"/>
    <taskdef resource="net/sf/antcontrib/antcontrib.properties"/>

    <property name="url"
value="http://localhost:8888/samples/xsp/java/resolver"/>
    
    <target name="main">
	    <foreach
list="0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,256,257,258,259,260,261,262,263,264,265,266,267,268,269,270,271,272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287,288,289,290,291,292,293,294,295,296,297,298,299,300,301,302,303,304,305,306,307,308,309,310,311,312,313,314,315,316,317,318,319,320,321,322,323,324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339,340,341,342,343,344,345,346,347,348,349,350,351,352,353,354,355,356,357,358,359,360,361,362,363,364,365,366,367,368,369,370,371,372,373,374,375,376,377,378,379,380,381,382,383,384,385,386,387,388,389,390,391,392,393,394,395,396,397,398,399,400,401,402,403,404,405,406,407,408,409,410,411,412,413,414,415,416,417,418,419,420,421,422,423,424,425,426,427,428,429,430,431,432,433,434,435,436,437,438,439,440,441,442,443,444,445,446,447,448,449,450,451,452,453,454,455,456,457,458,459,460,461,462,463,464,465,466,467,468,469,470,471,472,473,474,475,476,477,478,479,480,481,482,483,484,485,486,487,488,489,490,491,492,493,494,495,496,497,498,499,500,501,502,503,504,505,506,507,508,509,510,511,512,513,514,515,516,517,518,519,520,521,522,523,524,525,526,527,528,529,530,531,532,533,534,535,536,537,538,539,540,541,542,543,544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,559,560,561,562,563,564,565,566,567,568,569,570,571,572,573,574,575,576,577,578,579,580,581,582,583,584,585,586,587,588,589,590,591,592,593,594,595,596,597,598,599,600,601,602,603,604,605,606,607,608,609,610,611,612,613,614,615,616,617,618,619,620,621,622,623,624,625,626,627,628,629,630,631,632,633,634,635,636,637,638,639,640,641,642,643,644,645,646,647,648,649,650,651,652,653,654,655,656,657,658,659,660,661,662,663,664,665,666,667,668,669,670,671,672,673,674,675,676,677,678,679,680,681,682,683,684,685,686,687,688,689,690,691,692,693,694,695,696,697,698,699,700,701,702,703,704,705,706,707,708,709,710,711,712,713,714,715,716,717,718,719,720,721,722,723,724,725,726,727,728,729,730,731,732,733,734,735,736,737,738,739,740,741,742,743,744,745,746,747,748,749,750,751,752,753,754,755,756,757,758,759,760,761,762,763,764,765,766,767,768,769,770,771,772,773,774,775,776,777,778,779,780,781,782,783,784,785,786,787,788,789,790,791,792,793,794,795,796,797,798,799,800,801,802,803,804,805,806,807,808,809,810,811,812,813,814,815,816,817,818,819,820,821,822,823,824,825,826,827,828,829,830,831,832,833,834,835,836,837,838,839,840,841,842,843,844,845,846,847,848,849,850,851,852,853,854,855,856,857,858,859,860,861,862,863,864,865,866,867,868,869,870,871,872,873,874,875,876,877,878,879,880,881,882,883,884,885,886,887,888,889,890,891,892,893,894,895,896,897,898,899,900,901,902,903,904,905,906,907,908,909,910,911,912,913,914,915,916,917,918,919,920,921,922,923,924,925,926,927,928,929,930,931,932,933,934,935,936,937,938,939,940,941,942,943,944,945,946,947,948,949,950,951,952,953,954,955,956,957,958,959,960,961,962,963,964,965,966,967,968,969,970,971,972,973,974,975,976,977,978,979,980,981,982,983,984,985,986,987,988,989,990,991,992,993,994,995,996,997,998,999,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009,1010,1011,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1041,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1055,1056,1057,1058,1059,1060,1061,1062,1063,1064,1065,1066,1067,1068,1069,1070,1071,1072,1073,1074,1075,1076,1077,1078,1079,1080,1081,1082,1083,1084,1085,1086,1087,1088,1089,1090,1091,1092,1093,1094,1095,1096,1097,1098,1099,1100,1101,1102,1103,1104,1105,1106,1107,1108,1109,1110,1111,1112,1113,1114,1115,1116,1117,1118,1119,1120,1121,1122,1123,1124,1125,1126,1127,1128,1129,1130,1131,1132,1133,1134,1135,1136,1137,1138,1139,1140,1141,1142,1143,1144,1145,1146,1147,1148,1149,1150,1151,1152,1153,1154,1155,1156,1157,1158,1159,1160,1161,1162,1163,1164,1165,1166,1167,1168,1169,1170,1171,1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,1182,1183,1184,1185,1186,1187,1188,1189,1190,1191,1192,1193,1194,1195,1196,1197,1198,1199,1200,1201,1202,1203,1204,1205,1206,1207,1208,1209,1210,1211,1212,1213,1214,1215,1216,1217,1218,1219,1220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target="content" param=""/>
	</target>
	
	<target name="content">
	    <httpRequest href="${url}">
			<match>
				<responseCode value="200"/>
				<regexp>An XSP Page using a source</regexp>
			</match>
		</httpRequest>
	</target>
</project>	
--| end anteater file

On my laptop with W2k, PIVM, IBM R40 after 2828 Iterations jetty runs out of
memory. BTW, I tested this also last week but after 500 Iterations I thought
that the problem doesn't happen to this resource.

                                    - o -

This fact made my life much easier because I could debug Cocoon directly and
not within our application.

                                    - o -
                                                                        
Finally I think I found the Memory Leak. Since the C21 Core staff is highly
guristic to me (from guru **gg**) I'm of course not sure if I'm right. But
with my Fix my tests work ok now.

Ok. Here we go. I tracked down the lifecycle of a SitemapSource and found
that allready at creation of the Source the init() method makes pretty
much work to prepare the pipeline. For this reason an extra method of
the AbstractProcessingPipeline exists, the prepareInternal().

SitemapSource.init()
    |
    +--> ...
         AbstractProcessingPipeline.prepareInternal()    
            |
            +--> ...
                 AbstractProcessingPipeline.preparePipeline()    
                    |
                    +--> ...
                         AbstractCachingProcessingPipeline.setupPipeline()  
 
                            |
                            +--> ...
                                 AbstractProcessingPipeline.setupPipeline() 
  
                                    |
                                    +--> ...
                                         ServerPagesGenerator.setup()

[simplified callgraph, not complete]

I made breakpoints to SitemapSource init() and recycle(). Every Source
is recycled the right way! (So definetifely no problems with recycle)

After this I digged down the code beginning from init() until I reached
the generate() method of my own serverpage. I did this a few times and
realized that setup got called twice!

Ok, than I set a new breakpoint to ServerPagesGenerator.setup(), and
indeed, for every included xsp, the setup() method got called twice.
Than I walked the stack up from ServerPagesGenerator.setup() to the
calling method and - surprise - it was SitemapSource.getInputSource().

SitemapSource.getInputStream()
    |
    +--> ...
         AbstractProcessingPipeline.process()
            |
            +--> ...
                 AbstractProcessingPipeline.preparePipeline()
                    |
                    +--> ...
                         AbstractCachingProcessingPipeline.setupPipeline()
                            |
                            +--> ...
                                 AbstractProcessingPipeline.setupPipeline()
                                    |
                                    +--> ...
                                         ServerPagesGenerator.setup()
[simplified callgraph, not complete]                                        

                                        
    +-----------------------------------------------------------------+
    | Within cocoon:/ and cocoon:// resources Setup is called twice.  |
    +-----------------------------------------------------------------+

After this I made a quickfix to the SitemapSource constructor and
AbstractProcessingPipeline.process(). I added an attribute to query
the fact if we are in an internal pipeline:

in SitemapSource constructor: After creation of the MutableEnvironmentFacade

I added a Boolean to document the fact of an internal call:
    ...
    
    // The environment is a facade whose delegate can be changed in case of
internal redirects
    this.environment = new MutableEnvironmentFacade(wrapper);
    
    // MGe
    this.environment.setAttribute( "internal.call", new Boolean( "true" ) );
    // end MGe
    
    // ...and put information passed from the parent request to the internal
request
    if ( null != parameters ) {
       
this.environment.getObjectModel().put(ObjectModelHelper.PARENT_CONTEXT, parameters);
    } else {
       
this.environment.getObjectModel().remove(ObjectModelHelper.PARENT_CONTEXT);
    }
    ...

in AbstractProcessingPipeline.process() then I query this parameter and only

do a preparePipeline() if it is no internal call:
/**
 * Process the given <code>Environment</code>, producing the output.
 */
public boolean process(Environment environment)
throws ProcessingException {
    // If this is an internal request, lastConsumer was reset!
    if (null == this.lastConsumer) {
        this.lastConsumer = this.serializer;
    }
    
    // MGe
    if ( null != environment.getAttribute( "internal.call" ) &&
         ((Boolean) environment.getAttribute( "internal.call"
)).booleanValue() ) {
    	// no prepare, because already done in prepareInternal()
    }
    else {
    	this.preparePipeline(environment);
    }
    // end MGe
    ...

With this fix my pages now run and run and run ...

                                    - o -
                                    
What do you think. Does this help you? Is this a step in the right 
direction? Shall I prepare a patch for this? Can and how can I put 
it into bugzilla?
                                    
And one question: In the SitemapSource the Treeprocessor is fetched in 
2 different ways. If the cocoon:// protocol is used the Processor is 
fetched via
  this.processor = (Processor)this.manager.lookup(Processor.ROLE);
with the cocoon:/ protocol the statement is
  this.processor = CocoonComponentManager.getCurrentProcessor();
The TreeProcessor itself is marked ThreadSafe, and that means there is
one instance for the whole container. Did I miss something? Is it for
performance reasons?

Regards
Michael

-- 
+++ GMX - die erste Adresse für Mail, Message, More +++
Neu: Preissenkung für MMS und FreeMMS! http://www.gmx.net



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