Reduce test-validator ledger size

core/src/test_validator.rs

@@ -422,6 +422,10 @@ impl TestValidator {
             warp_slot: config.warp_slot,
             bpf_jit: !config.no_bpf_jit,
             validator_exit: config.validator_exit.clone(),
+            rocksdb_compaction_interval: Some(100), // Compact every 100 slots
+            max_ledger_shreds: Some(10_000), /* 10,000 was derived empirically by watching the size
+                                             of the rocksdb/ directory self-limit itself to the
+                                             40MB-150MB range when running `solana-test-validator` */
             no_wait_for_vote_to_start_leader: true,
             ..ValidatorConfig::default()
         };