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Adding some details on nthread parameter

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I got this information about nthread='real cpu count' from 7cb449c4a7/java/xgboost4j-demo/src/main/java/org/dmlc/xgboost4j/demo/ExternalMemory.java (L50)
Please confirm if this note is still valid before merging this change!
This commit is contained in:
Ajinkya Kale 2015-07-06 11:02:19 -07:00
parent a735f8cb76
commit b1bcb7183b
1 changed files with 5 additions and 1 deletions
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demo/binary_classification/README.md
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@ -162,7 +162,11 @@ If you want to continue boosting from existing model, say 0002.model, use
```
xgboost will load from 0002.model continue boosting for 2 rounds, and save output to continue.model. However, beware that the training and evaluation data specified in mushroom.conf should not change when you use this function.
#### Use Multi-Threading
When you are working with a large dataset, you may want to take advantage of parallelism. If your compiler supports OpenMP, xgboost is naturally multi-threaded, to set number of parallel running threads to 10, add ```nthread=10``` to your configuration.
When you are working with a large dataset, you may want to take advantage of parallelism. If your compiler supports OpenMP, xgboost is naturally multi-threaded, to set number of parallel running add ```nthread``` parameter to you configuration.
Eg. ```nthread=10```
Set nthread to be the number of your real cpu (On Unix, this can be found using ```lscpu```)
Some systems will have ```Thread(s) per core = 2```, for example, a 4 core cpu with 8 threads, in such case set ```nthread=4``` and not 8.
#### Additional Notes
* What are ```agaricus.txt.test.buffer``` and ```agaricus.txt.train.buffer``` generated during runexp.sh?