1 /* Blue Sky: File Systems in the Cloud
3 * Copyright (C) 2009 The Regents of the University of California
4 * Written by Michael Vrable <mvrable@cs.ucsd.edu>
14 #include "bluesky-private.h"
16 BlueSkyOptions bluesky_options;
18 /* Maximum number of threads to use in any particular thread pool, or -1 for no
20 int bluesky_max_threads = 16;
22 /* Watermark levels for cache tuning: these control when dirty data is flushed
23 * from cache, when clean data is dropped from the cache, etc. These values
24 * are measured in blocks, not bytes.
26 * There are a few relevant levels:
27 * low: Below this point, data is not forced out due to memory pressure
28 * medium: At this point start flushing data to get back below medium
29 * high: Flush data very aggressively (launch extra tasks if needed)
31 int bluesky_watermark_low_dirty = (64 << 20) / BLUESKY_BLOCK_SIZE;
32 int bluesky_watermark_medium_dirty = (96 << 20) / BLUESKY_BLOCK_SIZE;
33 int bluesky_watermark_high_dirty = (192 << 20) / BLUESKY_BLOCK_SIZE;
35 int bluesky_watermark_low_total = (64 << 20) / BLUESKY_BLOCK_SIZE;
36 int bluesky_watermark_medium_total = (128 << 20) / BLUESKY_BLOCK_SIZE;
37 int bluesky_watermark_high_total = (256 << 20) / BLUESKY_BLOCK_SIZE;
39 /* Environment variables that can be used to initialize settings. */
44 {"BLUESKY_OPT_SYNC_STORES", &bluesky_options.synchronous_stores},
45 {"BLUESKY_OPT_WRITETHROUGH", &bluesky_options.writethrough_cache},
46 {"BLUESKY_OPT_SYNC_INODE_FETCH", &bluesky_options.sync_inode_fetches},
47 {"BLUESKY_OPT_SYNC_FRONTENDS", &bluesky_options.sync_frontends},
51 /* BlueSky library initialization. */
53 void bluesky_store_init_s3(void);
54 void bluesky_store_init_kv(void);
56 /* Initialize the BlueSky library and dependent libraries. */
57 void bluesky_init(void)
62 for (int i = 0; option_table[i].env != NULL; i++) {
63 const char *val = getenv(option_table[i].env);
66 g_print("Option %s set to %d\n", option_table[i].env, v);
67 *option_table[i].option = atoi(val);
72 bluesky_store_init_kv();
73 bluesky_store_init_s3();