The problem can be reproduced as follows. First start a plasma store with
Then continuously put in objects using a script like the following.
As the loop counters are being printed, you will see long pauses. The problem is the fact that we are mmapping pages with the MAP_POPULATE flag. Though this can be used to improve performance of subsequent object creations, it isn't worth the long pauses. We may want to find a way to populate the pages in the background.