Changeset 156

Timestamp:

06/08/10 11:49:59 (3 years ago)

Author:

faltet

Message:

Refined the multi-domain algorithm for taking just multiples of cache size.

File:

• trunk/src/blosc.c (modified) (2 diffs)

trunk/src/blosc.c

@@ -634 +634 @@
 
   if (*flags & BLOSC_MEMCPYED) {
-    if ((nbytes > 64*KB) || (nthreads > 1)) {
-      /* More effective in multi-core processors or large buffers */
+    if (((nbytes % L1) == 0) || (nthreads > 1)) {
+      /* More effective with large buffers that are multiples of the
+       cache size or multi-cores */
       params.ntbytes = BLOSC_MAX_OVERHEAD;
       ntbytes = do_job();
     }
     else {
-      /* More effective in single-core processors or small buffers */
       memcpy(dest+BLOSC_MAX_OVERHEAD, src, nbytes);
       ntbytes = nbytes + BLOSC_MAX_OVERHEAD;
@@ -722 +722 @@
   /* Check whether this buffer is memcpy'ed */
   if (flags & BLOSC_MEMCPYED) {
-    if ((nbytes > 64*KB) || (nthreads > 1)) {
-      /* More effective in multi-core processors or large buffers */
+    if (((nbytes % L1) == 0) || (nthreads > 1)) {
+      /* More effective with large buffers that are multiples of the
+       cache size or multi-cores */
       ntbytes = do_job();
     }
     else {
-      /* More effective in single-core processors or small buffers */
       memcpy(dest, src+BLOSC_MAX_OVERHEAD, nbytes);
       ntbytes = nbytes;