Proxygen CacheLib example lookaside behavior #417
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This support adds the lookaside behavior on a cache miss. On a cache miss, it simply inserts the item by getting a random offset of sample data.
Also added the ability to set a certain object size. We can make this more configurable later with a distribution.
Sample run:
./proxygen_cache --port=8111 --cache_size_mb=1024 --item_size=65536 --enable_lookasidesiege -q -i -c 64 -t 30s -H "Content-Type: application/octet-stream" -f urls.txt