+int bluesky_verbose = 0;
+
+BlueSkyOptions bluesky_options = {
+ .cache_size = 1024*1024, // Default cache size is 1 GiB
+};
+
+/* Maximum number of threads to use in any particular thread pool, or -1 for no
+ * limit */
+int bluesky_max_threads = 16;
+
+/* Watermark levels for cache tuning: these control when dirty data is flushed
+ * from cache, when clean data is dropped from the cache, etc. These values
+ * are measured in blocks, not bytes.
+ *
+ * There are a few relevant levels:
+ * low: Below this point, data is not forced out due to memory pressure
+ * medium: At this point start flushing data to get back below medium
+ * high: Flush data very aggressively (launch extra tasks if needed)
+ */
+int bluesky_watermark_low_dirty = (64 << 20) / BLUESKY_BLOCK_SIZE;
+int bluesky_watermark_medium_dirty = (96 << 20) / BLUESKY_BLOCK_SIZE;
+int bluesky_watermark_high_dirty = (192 << 20) / BLUESKY_BLOCK_SIZE;
+
+int bluesky_watermark_low_total = (64 << 20) / BLUESKY_BLOCK_SIZE;
+int bluesky_watermark_medium_total = (128 << 20) / BLUESKY_BLOCK_SIZE;
+int bluesky_watermark_high_total = (256 << 20) / BLUESKY_BLOCK_SIZE;