* of the GNU Lesser General Public License.
*/
-static int P(internal)(struct sort_context *ctx, struct sort_bucket *in, struct sort_bucket *out)
+#include "lib/stkstring.h"
+
+typedef struct {
+ P(key) *key;
+ // FIXME: Add the hash here to save cache misses
+} P(internal_item_t);
+
+#define ASORT_PREFIX(x) SORT_PREFIX(array_##x)
+#define ASORT_KEY_TYPE P(internal_item_t)
+#define ASORT_ELT(i) ary[i]
+#define ASORT_LT(x,y) (P(compare)((x).key, (y).key) < 0)
+#define ASORT_EXTRA_ARGS , P(internal_item_t) *ary
+#include "lib/arraysort.h"
+
+/*
+ * The big_buf has the following layout:
+ *
+ * +-------------------------------------------------------------------------------+
+ * | array of internal_item's |
+ * +-------------------------------------------------------------------------------+
+ * | padding to make the following part page-aligned |
+ * +--------------------------------+----------------------------------------------+
+ * | shadow copy of item array | array of pointers to data for write_merged() |
+ * | used if radix-sorting +----------------------------------------------+
+ * | | workspace for write_merged() |
+ * +--------------------------------+----------------------------------------------+
+ * | +---------+ |
+ * | | key | |
+ * | +---------+ |
+ * | sequence of | padding | |
+ * | items +---------+ |
+ * | | data | |
+ * | +---------+ |
+ * | | padding | |
+ * | +---------+ |
+ * +-------------------------------------------------------------------------------+
+ *
+ * (the data which are in different columns are never accessed simultaneously,
+ * so we use a single buffer for both)
+ */
+
+static inline void *P(internal_get_data)(P(key) *key)
+{
+ uns ksize = SORT_KEY_SIZE(*key);
+#ifdef SORT_UNIFY
+ ksize = ALIGN_TO(ksize, CPU_STRUCT_ALIGN);
+#endif
+ return (byte *) key + ksize;
+}
+
+static inline size_t P(internal_workspace)(P(key) *key UNUSED)
+{
+ size_t ws = 0;
+#ifdef SORT_UNIFY
+ ws += sizeof(void *);
+#endif
+#ifdef SORT_UNIFY_WORKSPACE
+ ws += SORT_UNIFY_WORKSPACE(*key);
+#endif
+#if 0 /* FIXME: Shadow copy if radix-sorting */
+ ws = MAX(ws, sizeof(P(key) *));
+#endif
+ return ws;
+}
+
+static int P(internal)(struct sort_context *ctx, struct sort_bucket *bin, struct sort_bucket *bout, struct sort_bucket *bout_only)
+{
+ sorter_alloc_buf(ctx);
+ struct fastbuf *in = sbuck_read(bin);
+
+ P(key) key, *keybuf = ctx->key_buf;
+ if (!keybuf)
+ keybuf = ctx->key_buf = sorter_alloc(ctx, sizeof(key));
+ if (ctx->more_keys)
+ {
+ key = *keybuf;
+ ctx->more_keys = 0;
+ }
+ else if (!P(read_key)(in, &key))
+ return 0;
+
+ size_t bufsize = ctx->big_buf_size;
+#ifdef SORT_VAR_DATA
+ if (sizeof(key) + 2*CPU_PAGE_SIZE + SORT_DATA_SIZE(key) + P(internal_workspace)(&key) > bufsize)
+ {
+ SORT_XTRACE(3, "s-internal: Generating a giant run");
+ struct fastbuf *out = sbuck_write(bout);
+ P(copy_data)(&key, in, out);
+ bout->runs++;
+ return 1; // We don't know, but 1 is always safe
+ }
+#endif
+
+ SORT_XTRACE(4, "s-internal: Reading");
+ P(internal_item_t) *item_array = ctx->big_buf, *item = item_array, *last_item;
+ byte *end = (byte *) ctx->big_buf + bufsize;
+ size_t remains = bufsize - CPU_PAGE_SIZE;
+ do
+ {
+ uns ksize = SORT_KEY_SIZE(key);
+#ifdef SORT_UNIFY
+ uns ksize_aligned = ALIGN_TO(ksize, CPU_STRUCT_ALIGN);
+#else
+ uns ksize_aligned = ksize;
+#endif
+ uns dsize = SORT_DATA_SIZE(key);
+ uns recsize = ALIGN_TO(ksize_aligned + dsize, CPU_STRUCT_ALIGN);
+ size_t totalsize = recsize + sizeof(P(internal_item_t) *) + P(internal_workspace)(&key);
+ if (unlikely(totalsize > remains
+#ifdef CPU_64BIT_POINTERS
+ || item >= item_array + ~0U // The number of items must fit in an uns
+#endif
+ ))
+ {
+ ctx->more_keys = 1;
+ *keybuf = key;
+ break;
+ }
+ remains -= totalsize;
+ end -= recsize;
+ memcpy(end, &key, ksize);
+#ifdef SORT_VAR_DATA
+ breadb(in, end + ksize_aligned, dsize);
+#endif
+ item->key = (P(key)*) end;
+ item++;
+ }
+ while (P(read_key)(in, &key));
+ last_item = item;
+
+ uns count = last_item - item_array;
+ void *workspace UNUSED = ALIGN_PTR(last_item, CPU_PAGE_SIZE);
+ SORT_XTRACE(3, "s-internal: Read %u items (%s items, %s workspace, %s data)",
+ count,
+ stk_fsize((byte*)last_item - (byte*)item_array),
+ stk_fsize(end - (byte*)last_item - remains),
+ stk_fsize((byte*)ctx->big_buf + bufsize - end));
+ timestamp_t timer;
+ init_timer(&timer);
+ P(array_sort)(count, item_array);
+ ctx->total_int_time += get_timer(&timer);
+
+ SORT_XTRACE(4, "s-internal: Writing");
+ if (!ctx->more_keys)
+ bout = bout_only;
+ struct fastbuf *out = sbuck_write(bout);
+ bout->runs++;
+ uns merged UNUSED = 0;
+ for (item = item_array; item < last_item; item++)
+ {
+#ifdef SORT_UNIFY
+ if (item < last_item - 1 && !P(compare)(item->key, item[1].key))
+ {
+ // Rewrite the item structures with just pointers to keys and place
+ // pointers to data in the workspace.
+ P(key) **key_array = (void *) item;
+ void **data_array = workspace;
+ key_array[0] = item[0].key;
+ data_array[0] = P(internal_get_data)(key_array[0]);
+ uns cnt;
+ for (cnt=1; item+cnt < last_item && !P(compare)(key_array[0], item[cnt].key); cnt++)
+ {
+ key_array[cnt] = item[cnt].key;
+ data_array[cnt] = P(internal_get_data)(key_array[cnt]);
+ }
+ P(write_merged)(out, key_array, data_array, cnt, data_array+cnt);
+ item += cnt - 1;
+ merged += cnt - 1;
+ continue;
+ }
+#endif
+#ifdef SORT_ASSERT_UNIQUE
+ ASSERT(item == last_item-1 || P(compare)(item->key, item[1].key) < 0);
+#endif
+ P(write_key)(out, item->key);
+#ifdef SORT_VAR_DATA
+ bwrite(out, P(internal_get_data)(item->key), SORT_DATA_SIZE(*item->key));
+#endif
+ }
+#ifdef SORT_UNIFY
+ SORT_XTRACE(3, "Merging reduced %u records", merged);
+#endif
+
+ return ctx->more_keys;
+}
+
+static u64
+P(internal_estimate)(struct sort_context *ctx, struct sort_bucket *b UNUSED)
{
- /* FIXME :) */
- return 0;
+#ifdef SORT_VAR_KEY
+ uns avg = ALIGN_TO(sizeof(P(key))/4, CPU_STRUCT_ALIGN); // Wild guess...
+#else
+ uns avg = ALIGN_TO(sizeof(P(key)), CPU_STRUCT_ALIGN);
+#endif
+ // We ignore the data part of records, it probably won't make the estimate much worse
+ size_t bufsize = ctx->big_buf_size;
+#ifdef SORT_UNIFY_WORKSPACE // FIXME: Or if radix-sorting
+ bufsize /= 2;
+#endif
+ return (bufsize / (avg + sizeof(P(internal_item_t))) * avg);
}
projects / libucw.git / blobdiff