Simulator

The simulator includes a family of eviction policies and distribution generators. This helps when investigating whether a policy is a good fit for a usage scenario.

Usage

Run the Simulator in an IDE after specifying the desired configuration. Alternatively, run at the command line using gradlew simulator:run. The following trace formats are supported.

Traces	Location	Traces	Location
AdaptSize	author's simulator	Address (UCSD)	git repository
ARC	author's homepage	Cache2k	git repository
CameLab	project's homepage	Corda	git repository
Gradle	git repository	Kaggle	project's homepage
LIRS	git repository	LRB	author's simulator
Scarab	git repository	SNIA	project's homepage
Twitter	project's homepage	UMass	project's homepage
WikiBench	project's homepage

Rewriter

The rewriter utility converts traces from one format to another. This can be helpful when comparing a policy written in an alternative simulator that lacks support for a trace format.

gradlew :simulator:rewrite -PinputFormat=? -PinputFiles=? -PoutputFormat=? -PoutputFile=?

Sample Report

Due to batching and broadcasting, the timings are only comparable when running each policy independently.

╔══════════════════════╤══════════╤════════╤════════╤══════════╤═══════════╤══════════════════╤══════════╗
║ Policy               │ Hit rate │ Hits   │ Misses │ Requests │ Evictions │ Steps            │ Time     ║
╠══════════════════════╪══════════╪════════╪════════╪══════════╪═══════════╪══════════════════╪══════════╣
║ opt.Clairvoyant      │ 58.79 %  │ 9,323  │ 6,535  │ 15,858   │ 6,035     │ ?                │ 278.0 ms ║
╟──────────────────────┼──────────┼────────┼────────┼──────────┼───────────┼──────────────────┼──────────╢
║ sketch.WindowTinyLfu │ 56.11 %  │ 8,898  │ 6,960  │ 15,858   │ 6,460     │ 15,858 (100 %)   │ 315.2 ms ║
╟──────────────────────┼──────────┼────────┼────────┼──────────┼───────────┼──────────────────┼──────────╢
║ irr.Lirs             │ 55.97 %  │ 8,876  │ 6,982  │ 15,858   │ 6,482     │ 27,689 (174 %)   │ 311.0 ms ║
╟──────────────────────┼──────────┼────────┼────────┼──────────┼───────────┼──────────────────┼──────────╢
║ adaptive.Arc         │ 49.39 %  │ 7,833  │ 8,025  │ 15,858   │ 7,525     │ 15,858 (100 %)   │ 166.3 ms ║
╟──────────────────────┼──────────┼────────┼────────┼──────────┼───────────┼──────────────────┼──────────╢
║ linked.Lru           │ 46.51 %  │ 7,375  │ 8,483  │ 15,858   │ 7,983     │ 15,858 (100 %)   │ 128.2 ms ║
╟──────────────────────┼──────────┼────────┼────────┼──────────┼───────────┼──────────────────┼──────────╢
║ linked.Fifo          │ 40.72 %  │ 6,457  │ 9,401  │ 15,858   │ 8,901     │ 15,858 (100 %)   │ 163.6 ms ║
╚══════════════════════╧══════════╧════════╧════════╧══════════╧═══════════╧══════════════════╧══════════╝