Changeset 76

Timestamp:

05/03/10 05:00:58 (3 years ago)

Author:

faltet

Message:

A new parametrization more geared to achieve better compression ratios.

Location:

branches/threaded/src

Files:

• blosc.c (modified) (1 diff)
• blosclz.c (modified) (1 diff)

branches/threaded/src/blosc.c

@@ -432 +432 @@
   else if (nbytes >= L1*typesize) {
     blocksize = L1 * typesize;
-    /* Duplicate blocksize for compression levels 9 */
-    if (clevel == 9) {
+    if (clevel <= 3) {
+      blocksize /= 4;
+    }
+    else if (clevel <= 6) {
+      blocksize /= 2;
+    }
+    else if (clevel < 9) {
+      blocksize *= 1;
+    }
+    else {
       blocksize *= 2;
     }

branches/threaded/src/blosclz.c

@@ -111 +111 @@
 
   /* Hash table depends on the opt level.  Hash_log cannot be larger than 15. */
-  blzuint8 hash_log_[10] = {-1, 7, 8, 9, 10, 11, 12, 13, 13, 13};
+  blzuint8 hash_log_[10] = {-1, 9, 9, 9, 11, 11, 11, 12, 12, 13};
   blzuint8 hash_log = hash_log_[opt_level];
   blzuint16 hash_size = 1 << hash_log;