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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. 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 #### 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 #### Additional Notes
* What are ```agaricus.txt.test.buffer``` and ```agaricus.txt.train.buffer``` generated during runexp.sh? * What are ```agaricus.txt.test.buffer``` and ```agaricus.txt.train.buffer``` generated during runexp.sh?