-#include "dstm.h"
#include "addPrefetchEnhance.h"
+#include "altprelookup.h"
-extern int numprefetchsites;
-//pfcstats_t evalPrefetch[numprefetchsites]; //Global array for all prefetch sites in the executable
-extern pfcstats_t *evalPrefetch;
+extern int numprefetchsites; // Number of prefetch sites
+extern pfcstats_t *evalPrefetch; //Global array that keeps track of operation mode (ON/OFF) for each prefetch site
+extern objstr_t *prefetchcache; //Global Prefetch cache
+extern pthread_mutex_t prefetchcache_mutex; //Mutex to lock Prefetch Cache
+extern unsigned int myIpAddr;
+//#define LOGEVENTS
+#ifdef LOGEVENTS
+extern char bigarray[16*1024*1024];
+extern int bigindex;
+#define LOGEVENT(x) { \
+ int tmp=bigindex ++; \
+ bigarray[tmp]=x; \
+}
+#else
+#define LOGEVENT(x)
+#endif
+
+
+/* This function creates and initializes the
+ * evalPrefetch global array */
pfcstats_t *initPrefetchStats() {
pfcstats_t *ptr;
if((ptr = calloc(numprefetchsites, sizeof(pfcstats_t))) == NULL) {
return evalPrefetch[siteid].operMode;
}
+/* This function updates counters and mode of operation of a
+ * prefetch site during runtime. When the prefetch call at a site
+ * generates oids that are found/not found in the prefetch cache,
+ * we take action accordingly */
void handleDynPrefetching(int numLocal, int ntuples, int siteid) {
if(numLocal < ntuples) {
- /* prefetch not found locally(miss in cache) */
+ /* prefetch not found locally(miss in cache); turn on prefetching*/
evalPrefetch[siteid].operMode = 1;
evalPrefetch[siteid].uselesscount = SHUTDOWNINTERVAL;
} else {
+ //Turn off prefetch site
if(getOperationMode(siteid) != 0) {
evalPrefetch[siteid].uselesscount--;
- if(evalPrefetch[siteid].uselesscount <= 0)
+ if(evalPrefetch[siteid].uselesscount <= 0) {
+ LOGEVENT('O');
evalPrefetch[siteid].operMode = 0;
+ }
+ }
+ }
+}
+
+#if 1
+/* This function clears from prefetch cache those
+ * entries that caused a transaction abort */
+void cleanPCache() {
+ unsigned int size = c_size;
+ chashlistnode_t *ptr = c_table;
+ int i;
+ for(i = 0; i < size; i++) {
+ chashlistnode_t *curr = &ptr[i]; //for each entry in the cache lookupTable
+ while(curr != NULL) {
+ if(curr->key == 0)
+ break;
+ objheader_t *header1, *header2;
+ /* Not found in local machine's object store and found in prefetch cache */
+ if((header1 = mhashSearch(curr->key)) == NULL && ((header2 = prehashSearch(curr->key)) != NULL)) {
+ /* Remove from prefetch cache */
+ prehashRemove(curr->key);
+ }
+ curr = curr->next;
+ }
+ }
+}
+#else
+/* This function clears from prefetch cache those
+ * entries that caused a transaction abort */
+void cleanPCache() {
+ unsigned int size = c_size;
+ struct chashentry *ptr = c_table;
+ int i;
+ for(i = 0; i < size; i++) {
+ struct chashentry *curr = &ptr[i]; //for each entry in the cache lookupTable
+ if(curr->key == 0)
+ continue;
+ objheader_t *header1, *header2;
+ /* Not found in local machine's object store and found in prefetch cache */
+ if((header1 = mhashSearch(curr->key)) == NULL && ((header2 = prehashSearch(curr->key)) != NULL)) {
+ /* Remove from prefetch cache */
+ prehashRemove(curr->key);
}
}
}
+#endif
+
+/* This function updates the prefetch cache with
+ * entries from the transaction cache when a
+ * transaction commits
+ * Return -1 on error else returns 0 */
+int updatePrefetchCache(trans_req_data_t *tdata) {
+ int retval;
+ char oidType;
+ /*//TODO comment it for now because objects read are already in the prefetch cache
+ oidType = 'R';
+ if(tdata->f.numread > 0) {
+ if((retval = copyToCache(tdata->f.numread, (unsigned int *)(tdata->objread), oidType)) != 0) {
+ printf("%s(): Error in copying objects read at %s, %d\n", __func__, __FILE__, __LINE__);
+ return -1;
+ }
+ }
+ */
+ if(tdata->f.nummod > 0) {
+ oidType = 'M';
+ if((retval = copyToCache(tdata->f.nummod, tdata->oidmod, oidType)) != 0) {
+ printf("%s(): Error in copying objects read at %s, %d\n", __func__, __FILE__, __LINE__);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+int copyToCache(int numoid, unsigned int *oidarray, char oidType) {
+ int i;
+ for (i = 0; i < numoid; i++) {
+ unsigned int oid;
+ //if(oidType == 'R') {
+ // char * objread = (char *) oidarray;
+ // oid = *((unsigned int *)(objread+(sizeof(unsigned int)+
+ // sizeof(unsigned short))*i));
+ //} else {
+ oid = oidarray[i];
+ //}
+ pthread_mutex_lock(&prefetchcache_mutex);
+ objheader_t * header;
+ if((header = (objheader_t *) t_chashSearch(oid)) == NULL) {
+ printf("%s() obj %x is no longer in transaction cache at %s , %d\n", __func__, oid,__FILE__, __LINE__);
+ fflush(stdout);
+ return -1;
+ }
+ //copy into prefetch cache
+ int size;
+ GETSIZE(size, header);
+ objheader_t * newAddr;
+ if((newAddr = prefetchobjstrAlloc(size + sizeof(objheader_t))) == NULL) {
+ printf("%s(): Error in getting memory from prefetch cache at %s, %d\n", __func__,
+ __FILE__, __LINE__);
+ pthread_mutex_unlock(&prefetchcache_mutex);
+ return -1;
+ }
+ pthread_mutex_unlock(&prefetchcache_mutex);
+ memcpy(newAddr, header, size+sizeof(objheader_t));
+ //Increment version for every modified object
+ if(oidType == 'M') {
+ newAddr->version += 1;
+ newAddr->notifylist = NULL;
+ }
+ STATUS(newAddr)=0;
+
+ //make an entry in prefetch lookup hashtable
+ prehashInsert(oid, newAddr);
+ } //end of for
+ return 0;
+}
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