Can you start with the smallest option and access the CLI? If so, you can do the following:
redis-cli > info
View the following values ββand notes:
used_memory:931104 used_memory_human:909.27K used_memory_rss:1052672 used_memory_peak:931008 used_memory_peak_human:909.19K
Then download the 100k entries and do the same thing and compare the difference in memory. It's very difficult to say, guessing the size, and note that there is overhead (the vanilla installation without data on my MacBookPro 2011 w / OSX Lion is installed in the above figures).
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