Performance

The default PANDA configuration has been optimized for an EC2 Small server environment. However, even if that is the hosting solution it is possible the default configuration may not be optimal for you.

Task throttling

If you are running on an instance smaller or larger than our recommended server you may wish to configure a shorter or longer time to wait between importing batches of data. This small “throttle” value allows the server to periodically catch up on user requests while importing data. You’ll find this configuration option in the Performance section of the admin settings page.

Increasing the number will provided additional time for user requests and should improve PANDA’s responsiveness, at the cost of imports taking longer. Decreasing the number will allow less time for user requests, which is appropraite if your server has multiple CPUs. In the latter case you may even be able to set this value to zero and still have a very responsive server.

Note

In the vast majority of cases the default value for this option is fine, so if you are not sure how to tune it, you should probably just leave it alone.

Solr

You may wish to adjust how much memory you give to Solr. You will find the relevant configuration in /etc/init/solr.conf:

description "Solr server for PANDA"
start on runlevel [2345]
stop on runlevel [!2345]
respawn
exec sudo -u solr sh -c "java -Xms256m -Xmx512m -Dsolr.solr.home=/opt/solr/panda/solr -Djetty.home=/opt/solr/panda -Djetty.host=127.0.0.1 -jar /opt/solr/panda/start.jar >> /var/log/solr.log"

The startup parameters -Xms and -Xmx control the minimum and maximum memory that Solr will consume while indexing documents and performing queries.

If you’re running on anything larger than an EC2 Small you will almost certainly want to increase these numbers. Even on an EC2 Small you may need to increase them if your are storing a large amount of data. As a rule of thumb you will want to leave between 768m and 1g of the system’s total memory for other processes.

A note on dataset size

In general, uploading very large datasets (greater than 100MB) to PANDA is fine. It is even encouraged! However, there is a caveat regarding extremely wide datasets. Datasets with hundreds or thousands of columns can cause PANDA to perform very poorly. This is not a function of the search being slow, but rather of the amount of data PANDA needs to deliver to and render in the browser. For this reason it is best to avoid uploading very wide datasets.

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