Mentat

"Problem" jsem vypozoroval v python 3 na Ubuntu 12.04.
Dokud byl mentat-hub na wheezym, problem se neprojevil.
Na Debian Jessie se tato "vlastnost" opakuje.

The MongoDB server returns the query results in batches. Batch size will not exceed the maximum BSON document size. For most queries, the first batch returns 101 documents or just enough documents to exceed 1 megabyte. Subsequent batch size is 4 megabytes. To override the default size of the batch, see batchSize() and limit().

For queries that include a sort operation without an index, the server must load all the documents in memory to perform the sort and will return all documents in the first batch.

As you iterate through the cursor and reach the end of the returned batch, if there are more results, cursor.next() will perform a getmore operation to retrieve the next batch.

Tucny vysledek je ve vterinach a doklada, ze jakmile se dosahne limitu 101 dokumentu, vse se zpomali.

1. ./mongotest -f -r 100 -q -c cache.cfg
   I am going to use MongoDB version 24
   Total elapsed time of script: 0:00:01.726564

1. ./mongotest -f -r 102 -q -c cache.cfg
   I am going to use MongoDB version 24
   Total elapsed time of script: 0:00:46.054243

Zvetsim-li limit, je to lepsi:
cursor = alerts.find(f["filter"]).batch_size(200)

1. ./mongotest -f -r 102 -q -c cache.cfg
   I am going to use MongoDB version 24
   Total elapsed time of script: 0:00:03.790171

Pharook:
Chápu to dobře? Zmiňuješ tam i něco o úpravě kódu, ale nevím přesně, co tím myslíš
- úpravou pythonového kódu se to asi nevyřeší, ne?

Upravou kodu myslim toto:
cursor = alerts.find(f["filter"]).batch_size(200)