| <html><head><title>Resource Data Structures</title> |
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| </head><body><h2>Resource Data Structures</h2> |
| <p>Since: 3.0<br> |
| Last Modified: $Date: 2004/06/01 13:53:59 $</p> |
| |
| This section contains results on memory footprint of CVS in the Core resource |
| plugin data structures. More specifically, CVS uses the session and persistant property |
| caches along with the synchronizer. |
| |
| <h3>CVS Workspace Sync info caches</h3> |
| |
| Checking of the cahce usage requires the use of the Core spy tools. To |
| obtain the memory footprint, perform the following steps. |
| |
| <ol> |
| <li>Install the Core Spy Tools |
| <li>Launch Eclipse |
| <li>Checkout several projects |
| <li>Open the Element Tree Spy to get the memory footprint. At the |
| time of writting, CVS is the main user of these structures. In future |
| test, ensure that others are not contributing to the tally. |
| <li>Disconnect all the projects |
| <li>The Element Tree Spy memory footprint should be reduced accordingly |
| </ol> |
| |
| The following snapshot of the resource element tree was taken after checking out all of the projects |
| (294 as of 2004/05/31) in dev.eclipse.org. |
| |
| <pre> |
| Total resource count: 89,466 |
| Team private: 10,186 |
| Phantom: 4,055 |
| Markers: 0 |
| SyncInfo: 10,432 |
| Number of layers: 15 |
| Number of nodes: 89,514 |
| Number of non-identical strings: 48,456 |
| Total memory used by nodes: 23,141,343 |
| Nodes and ResourceInfo: 8,586,108 |
| Strings: 3,584,724 |
| Markers: 0 |
| Sync info: 1,447,861 |
| Session properties: 9,522,650 |
| class [B: 2,618,076 |
| class [Ljava.lang.Object;: 2,564,448 |
| class org.eclipse.core.internal.utils.ObjectMap: 1,700,240 |
| class [C: 1,454,994 |
| class java.lang.Long: 610,800 |
| class java.lang.String: 286,580 |
| class org.eclipse.team.internal.ccvs.core.syncinfo.FolderSyncInfo: 285,292 |
| class java.util.ArrayList: 768 |
| class org.eclipse.team.internal.ccvs.core.util.StringMatcher: 660 |
| class org.eclipse.team.internal.ccvs.core.util.FileNameMatcher: 320 |
| class [Ljava.lang.String;: 300 |
| class org.eclipse.core.runtime.QualifiedName: 160 |
| class java.lang.Object: 12 |
| The top 20 equal but non-identical strings are: |
| A.java->2,002 |
| in->1,219 |
| plugin.xml->913 |
| out->794 |
| A_out.java->489 |
| A_in.java->487 |
| eclipse->431 |
| org->421 |
| Test.java->412 |
| B.java->345 |
| build.properties->297 |
| I.java->269 |
| internal->256 |
| about.html->253 |
| plugin.properties->243 |
| .cvsignore->227 |
| .classpath->209 |
| ui->185 |
| src->184 |
| package.html->165 |
| </pre> |
| |
| <h3>CVS Merge memory usage</h3> |
| Merging in CVS makes use of the Core synchronizer. Perform the following steps |
| with the Core Spy Tool installed to |
| ensure proper memory management. |
| |
| <ol> |
| <li>Checkout one or more projects |
| <li>Open the Element Tree Spy to get the memory footprint. |
| <li>Perform a merge |
| <li>Open the Element Tree Spy to get the memory footprint. The only increase |
| should be in the synchronizer. |
| <li>Remove the merge from the sync view |
| <li>The Element Tree Spy memory footprint should be reduced accordingly |
| </ol> |
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