From: Michael Vrable <mvrable@cs.ucsd.edu>
Date: Thu, 28 Jan 2010 18:56:11 +0000 (-0800)
Subject: Let storage tuning options be set via environment variables.
X-Git-Url: http://git.vrable.net/?p=bluesky.git;a=commitdiff_plain;h=8ff2f84811f4d4b7c684e04b4cc8d1aced2a1d4a

Let storage tuning options be set via environment variables.

This should make benchmarking runs easier.
---

diff --git a/bluesky/bluesky.h b/bluesky/bluesky.h
index 58ff29f..421d07d 100644
--- a/bluesky/bluesky.h
+++ b/bluesky/bluesky.h
@@ -28,7 +28,7 @@ typedef struct {
     /* Can inodes be fetched asynchronously?  (Inode object is initially
      * created in a pending state, and not unlocked until the data is actually
      * available.) */
-    int async_inode_fetches;
+    int sync_inode_fetches;
 } BlueSkyOptions;
 
 extern BlueSkyOptions bluesky_options;
diff --git a/bluesky/init.c b/bluesky/init.c
index 69fbe62..7a6efe1 100644
--- a/bluesky/init.c
+++ b/bluesky/init.c
@@ -15,6 +15,17 @@
 
 BlueSkyOptions bluesky_options;
 
+/* Environment variables that can be used to initialize settings. */
+static struct {
+    const char *env;
+    int *option;
+} option_table[] = {
+    {"BLUESKY_OPT_SYNC_STORES", &bluesky_options.synchronous_stores},
+    {"BLUESKY_OPT_WRITETHROUGH", &bluesky_options.writethrough_cache},
+    {"BLUESKY_OPT_SYNC_INODE_FETCH", &bluesky_options.sync_inode_fetches},
+    {NULL, NULL}
+};
+
 /* BlueSky library initialization. */
 
 void bluesky_store_init_s3(void);
@@ -25,9 +36,14 @@ void bluesky_init(void)
     g_thread_init(NULL);
     bluesky_crypt_init();
 
-    bluesky_options.synchronous_stores = 0;
-    bluesky_options.writethrough_cache = 0;
-    bluesky_options.async_inode_fetches = 0;
+    for (int i = 0; option_table[i].env != NULL; i++) {
+        const char *val = getenv(option_table[i].env);
+        if (val != NULL) {
+            int v = atoi(val);
+            g_print("Option %s set to %d\n", option_table[i].env, v);
+            *option_table[i].option = atoi(val);
+        }
+    }
 
     bluesky_store_init();
     bluesky_store_init_s3();
diff --git a/nfs3/nfsd.c b/nfs3/nfsd.c
index 9b6ba39..d35c36d 100644
--- a/nfs3/nfsd.c
+++ b/nfs3/nfsd.c
@@ -33,8 +33,6 @@ int main(int argc, char *argv[])
     g_set_prgname("nfsd");
     register_rpc();
 
-    bluesky_options.async_inode_fetches = 1;
-
     store = bluesky_store_new("s3");
     fs = bluesky_init_fs("export", store);